US 4,995,945 AGrant
Counter-Current Gas-Liquid Contacting Device
Issue Date:1991-02-26
•15 Claims
•5 Drawing Sheets
Abstract
A counter-current contacting device which includes a number of features which increase the efficiency and/or increase the pressure differential across the device is disclosed. Systems for reducing the alcohol content of an alcohol containing beverage or wine, for stripping aroma and flavor from a fruit juice and for desulphuring a liquid containing dissolved sulphur dioxide are also disclosed. Each of these systems incorporate a counter-current contact device of the invention.
Metadata
Assignee
- Flavourtech Pty. Ltd.
Inventor
- Andrew J. M. Craig
Application Information
Application Number:US 1655795
Filing Date:1988-03-08
Priority Date:1985-02-11
Art Unit:133
Classifications
IPC:
B01D 122B01D 1900
Field of Search:
2032021592614265542389;49;72;98;91;94;99;4;DIG. 19;DIG. 13;19153;162;236;177;158;238;205;234;1596.1;6.2;6.3;8;12;4989494;493;492;592;59936;37;46;73;190;200539
Patent Drawings (5 sheets)
Description
Preferred embodiments of the invention are illustrated by way of example in the accompanying drawings in which:
FIG. 1 is a schematic sectional side elevation of a fin having a profiled distal border which is substantially parallel to the surface of liquid flowing over a frustoconical surface;
FIG. 2 is a schematic sectional side elevation of a rotating cone column having a plurality of fins of the type of FIG. 1;
FIG. 3 is a block diagram of an extraction plant which incorporates a rotating cone column;
FIG. 4 is a schematic sectional side view of a rotating cone column having means to recycle gas through the column and means to recirculate liquid to proximately above a frustoconical surface and including means to heat the liquid prior to its introduction into the housing;
FIG. 5 is a schematic sectional side elevation of a rotating cone column having a vacuum pump to reduce the pressure of gas or gases and/or vapour or vapours in the column and means to recirculate liquid from the column to above a frustoconical surface and including means to heat the liquid prior to its introduction into the housing; and
FIG. 6 is a cross-sectional bottom view of a central shaft supporting an inverted cone having a plurality of curved fins.
FIG. 1 depicts inverted cone 3 having a fin 4 extending from its lower surface. Cone 3 is mounted on central shaft 2 which is rotatably located within cylindrical housing 7. Frustoconical surfaces 5, 6 extend from the inner wall of housing 7 towards shaft 2. The gap between the inner edges of frustoconical surface 6 and central shaft 2 is sufficient to permit liquid to flow freely onto surface 3 at a maximum selected liquid flow rate through a rotating cone column having a plurality of cones and frustoconical surfaces without significant interference by the liquid to a flow rate of gas and/or vapour through the column In addition, the gap between surface 3 and the inner surface of wall 7 is sufficient to permit liquid to flow freely onto frustoconical surface 5 at the maximum selected flow rate through a rotating cone column without significant interference by the flowing liquid to gas and/or vapour flowing through the column.
Fin 4 has a profiled distal border that is substantially parallel to the surface of a liquid 8 which is to flow or is flowing over frustoconical surface 5. Wall 7 is enclosed by a steam/hot water jacket 9 which can be used to heat the contents of the rotating cone column. Shaft 2 is adjustable up or down whereby the gap between the distal border of fin 4 and liquid 8 can be selected.
Referring to FIG. 2 a rotating cone column 40 having a plurality of fins 46 of the type of FIG. 1 are supported on central shaft 41 between a plurality of frustoconical surfaces 45.
Column 40 includes jacket 52 which has a steam/hot water inlet 48 and outlet 51. Column 40 includes gas inlet and outlet 47, 43, liquid inlet and outlet 42, 49 and vent 53 which is open and closed via valve 54. Shaft 41 which is rotated by motor 50 is adjustable up and down, as shown at 100, whereby the gap between the distal borders of fins 46 and liquid which is to flow or is flowing through the column on surfaces 45 can be selected. The adjustability of shaft 41 is particularly useful since the height of liquid flowing over surfaces 45 varies in proportion to the liquid flow rate through column 40. Fan 44 is mounted on shaft 41 to provide an upward sucking force and thereby increase the flow rate through column 40 of gas or gases and/or vapour or vapours and hence increase the distillation, fractional distillation or stripping rate and/or efficiency of a selected volatile component or components from liquid flowing through column 40.
In use liquid having a volatile component or components is fed into column 40 via inlet 42. Shaft 41 is rotated whilst at least a portion of the fed liquid is resident in column 40 to generate a flow of gas or gases and/or vapour or vapours proximately above the liquid A portion of gas or gases and/or vapour or vapours which are distilled, fractionally distilled or stripped from the liquid via the generated gas or gases and/or vapour or vapours flow are collected from outlet 43 and stored or condensed and then stored. Liquid fed to the column via inlet 42 is typically pre-heated.
The extraction plant of FIG. 3 can be used to distil, fractionally distil or strip a selected volatile component or components from a liquid including reducing the alcohol content of an alcohol containing beverage, reducing the alcohol content of a wine, stripping aroma and/or flavour from a fruit juice or desulphuring a liquid containing dissolved sulphur dioxide.
The liquid from which a volatile component or components is to be distilled, fractionally distilled or stripped is fed from reservoir 13 via valve 14 and preheater 23 into rotating cone column 33. Suitable feeding means is a counter-current diffusion extractor of the type described in Howden Refrigeration Pty Limited and Commonwealth Scientific and Industrial Research Organisation, Australian Patent Application No. AU 72358/81. Column 33 is depicted in detail in FIG. 2 and includes vertically adjustable central shaft 21 rotatably driven by motor 22 and steam/hot water jacket 30 having inlet and outlet 26, 27. After passing through column 33 the extracted liquid can be partially or totally drained to container/drain 10 via valve 11 and/or partially or totally recycled via valve 34, pump 12 and heater 23 back into column 33. The distillation, fractional distillation and/or stripping of the liquid can be performed under an atmosphere of air or a selected atmosphere such as nitrogen by providing nitrogen via gas reservoir 28 to pump 19. Column 23 is initially purged by pumping nitrogen via preheater 24, inlet 31 and vent 25 with valve 32 open and valve 15 closed. After purging, valve 32 is closed and liquid is fed into column 33 as described above with valve 15 opened. If desired, column 33 can be allowed to reach steady state by recirculating the gas/vapour mixture resulting from the distillation, fractional distillation and/or stripping process using pump 19 with valve 29 open and valves 16 and 36 closed. On attaining steady state valve 29 is closed and valve 16 opened and at least a portion of the resultant extracted vapour or vapours and/or gas or gases condensed via condensor 17, the distillate being collected in storage container 18. Nitrogen passing through condensor 17 can be recirculated through column 33 by opening valve 36 and closing valve 37 or alternatively can be vented through vent 38 via valve 37. Pump 19 can be used to increase gas and/or vapour flow rate through column 33 during a distillation, fractional distillation and/or stripping procedure.
Referring to FIG. 4 rotating cone column 60 is similar to column 40 of FIG. 2 except the fan 44 of FIG. 2 has not been included and a fin 61 has a profile distal border which is substantially parallel to the upper surface of a proximately located frustoconical surface 62.
Column 60 has associated therewith outlet and inlet lines 63 and 64 through which at least a portion of liquid from column 60 is recirculated to above a frustoconical surface via pump 65 and heater 66. Heater 66 heats the liquid prior to its introduction into column 60.
Column 60 is also associated with means to recycle a gas or gases and/or vapour or vapours through column 60 which includes gas or vapour inlet and outlet lines 67, 68 through which gas and/or vapour is recirculated via pump 69.
Rotating cone column 70 in FIG. 5 is similar to column 60 in FIG. 4 except column 70 is not associated with means to recycle a gas or gases and/or vapour or vapours through it but it does include condensor 71 which couples column 70and vacuum pump 72.
In the operation of column 70 pump 72 pulls a vacuum to reduce the pressure of gas or gases and/or vapour or vapours in column 70 and thereby increases the distillation, fractional distillation and/or stripping rate and/or efficiency of a selected volatile component or components from liquid in column 70. The resultant gas and/or vapour are condensed in condensor 71 from which they can be removed via drain 73.
FIG. 6 depicts a cross-sectional bottom view of a central shaft 80 supporting an inverted cone 81 having a plurality of curved fins 82. Curved fins 82 have the advantage of decreasing motor loading without significantly changing the performance of a rotating cone column. As a result the power requirement to a motor driving shaft 80 is estimated to be up to 25% less than for non-curved radially extending fins.
Example 1
A comparison of the performances of a rotating cone column of this invention against a prior rotating cone column is given in Table 1:
From Table 1 it is apparent that a rotating cone column of the invention strips a higher percentage of alcohol for zero gas flow than the prior rotating con column which exemplifies improved column performance provided by the profiled fins in the column of the invention. Table 1 also lists improved pressure drops per stage and across the rotating cone column of the invention of those of the prior rotating cone column. This further exemplifies improved column performance imparted by the profiled fins in the column of the invention.
Example 2
A study of the effect of product flow rate through a rotating cone column of the invention on pressure drop across the column was conducted without and with an externally induced gas flow through the column. The results are listed in Tables 2 and 3 respectively:
The results indicate as product flow rate increases the gap between the liquid surface on the stationary cone and the blades decreases the pressure drop across the column increases causing a corresponding increase in the gas pumping efficiency of the column.
The pressure drop with an externally induced high gas flow in the column is positive and increases as the product flow rate is increased to 4000 1.hr.sup.-1. At higher product flow rates the decreasing blades t liquid surface distance causes increased gas pumping efficiency which results in a lowering of the pressure drop as the product flow rate is increased from 4000 to 7000 1.hr-1.
Example 3
An investigation of the effect of the flow rate of product reinjected into a rotating cone column of the invention on pressure drop across the column without and with an externally induced gas flow through the column was performed. The findings are listed in Tables 4 and 5 respectively:
As reinjection flow rate increases a slight increase in gas pumping efficiency of the column is achieved but as the top part of the column still has a large gap between the blade this increase is not as large as that observed for comparable increases in the product flow rate (see Table 2)
As reinjection flow rate increases the pressure drop increases and then decreases as the blades come into closer proximity with the liquid surface through the size of decrease is lower than for corresponding increases in product flow rate because of the low flow rate in the top of the column.
Example 4
Conventional systems for the stripping of aromas from fruit juices normally are carried out in one of the effects of the evaporator or in a single stage prior to the evaporator. These strippers are normally single effect and the percentage stripped varies depending on the type of juice being processed. e.g. 10% in the case of apples and 30% in the case of concord grapes. Because of the large volume of product which is required to be evaporated conventional systems utilise fractionating columns to concentrate these flavours.
A system for stripping aromas from fruit juices using the rotating cone column of the invention achieves its stripping action in the column. The deflavoured juice can then be processed (fining and filtered) and concentrated without degrading the flavour component. Because the rotating cone column is a multistage (40 effects) stripping process only a small percentage (1 to 2 percent) is evaporated to achieve the desired stripping effect. This in turn renders the concentration of the aromas in fractionating columns unnecessary and they are collected by simple condensation.
The percentages of ethyl acetate (one of the components of apple juice) remaining after passing through a single effect distillation column and an eight effect rotating cone column of the invention are as listed in Table 6:
That is, the rotating cone column removes most of the ethyl acetate after only 5% of the total volume has been evaporated compared with 8.5% ethyl acetate remaining after 30% of the total volume has been evaporated by a single distillation column. In practice, the costs associated with flavour extract storage and transport are minimised when the extract is prepared using a rotating cone column of the invention since the column removes a large percentage of the flavours and aromas from the juice and simultaneously produces a highly concentrated extract.
A comparison of typical flavour extract volumes expressed as percentages of the total fruit juice volume are listed in Table 7:
A typical procedure for preparing fruit juice which includes using the rotating cone column of the invention is as follows:
1. Extract juice using known extraction procedures.
2. Remove flavour extract with Recovery Plant which includes a rotating cone column and place extract in suitable storage. Typically conditions under which a column of the invention is operated are listed in Table 8:
3. Handle deflavoured juice through normal processing steps; i.e. fining, filtration, concentration etc.
4. Recombine flavour extract and processed juice at point of packing for consumer sale.
Some particular advantages of using the rotating cone column of the invention together with a externally induced gas flow is that a relatively inert and inexpensive gas such as nitrogen can be used to minimise oxidation and thus degradation of flavours and aromas during the evaporation process. Furthermore the evaporation temperature in the column can be adjusted to a desired level to optimise evaporation rate and minimise thermal degradation by regulating gas flow rate and product flow rate. The effects of various gas and product flow rates on the temperature of evaporation of apple juice in a rotating cone column of the invention are listed in Table 9.
Example 5
There are currently two types of desulphuring plants in general use:
1. Those using recirculated nitrogen as a stripping medium. As far as the prior art is known plants of this type, unlike plants of this invention, do not use heat reinjection to reduce heat damage and counteract evaporative cooling.
2. Those using steam from a reboiler as a stripping medium. These units have a higher product loss (up to 10%) and cause more heat damage than plants of this invention due to the higher temperatures required to generate steam flow rate from boiling.
A typical desulphurization procedure which includes using the spinning cone column of the invention is as follows:
1. Extract juice from fruit as normal.
2. Remove flavour extract from juice with Recovery Plant including rotating cone column and store.
3. Add sulphur dioxide to extracted juice to recommended level.
4. Store extracted juice ambient temperature storage tanks.
5. Allow fruit solids to settle from extracted juice with gravity over 10 to 15 days.
6. Filter extracted juice with fine grade earth.
7. Filter fruit solids with rotary drum vacuum filter or high pressure lees filter.
8. Return juice recovered from fruit solids to filtered extracted juice from 6.
9. Store combined extracted juice at ambient temperature until required.
10. Remove sulphur dioxide from combined extracted juice with rotating cone column.
11. Add flavour extract from 2 to combined extracted juice from 10.
Typical operating conditions of the rotating cone column during desulphurization are listed in Table 10.
Example 6
Typical dealcoholisation procedures which include using the rotating cone column of the invention are as follows:
A. Low Alcohol Wine (less than 0.1% v/v)
1. Remove aroma extract from grape juice using a Recovery Plant including rotating cone column and store.
2. Adjust acid in extracted grape juice to desired level.
3. Ferment extracted grape juice to wine.
4. Remove alcohol using rotating cone column.
5. Add back aroma extract of 1.
6. Blend in original grape juice to achieve desired sweetness level.
B. Alcohol Reduced Wine Method 1
1. Produce low alcohol wine as for A.
2. Add back flavour alcohol extract collected from vacuum pump during dealcoholisation to achieve desired level of alcohol.
C. Alcohol Reduced Wine Method 2
1. Produce low alcohol wine as for A.
2. Blend with normal strength wine to achieve desired level of alcohol.
D. Alcohol Reduced Wine Method 3
1. Remove aroma extract from grape juice using a Recovery Plant including rotating cone column.
2. Adjust acid in extracted grape juice to desired level.
3. Partially ferment extracted grape juice.
4. Stop fermentation at a level of sweetness sufficient to give desired alcohol level when fermentation is restarted.
5. Remove alcohol using rotating cone column.
6. Complete fermentation.
7. Add back aroma extract of 1.
8. Sweeten with original grape juice to the desired level.
Typical operation conditions of the rotating cone column during dealcoholisation are listed in Table 11.
Claims
What is claimed is:
1. A counter-current contacting device comprising: a housing having a vertical longitudinal axis: a rotatable shaft at least partially disposed within said housing, so as to extend longitudinally thereof, and which is vertically adjustable relative to said housing; at least one inverted cone mounted on said shaft within said housing and having at least one fin extending outwardly from said shaft and mounted along said cone and extending downwardly from said cone to provide a fin distal border; said housing having a first lower frustoconical surface over which liquid can pass and extending inwardly from the inner wall thereof and disposed so as to be approximately adjacent to said distal border and adjustable relative thereto by said relative adjustment to provide a selectable gap, a motor coupled to said shaft to rotate said shaft; said housing having coupled operatively therewith means to recirculate liquid passing through the device from at least one liquid outlet associated with said housing to approximately above said first lower frustoconical surface through at least one liquid inlet into said housing, said means to recirculate liquid including means to heat said liquid prior to its reintroduction into said housing; a second lower frustoconical surface below said first lower frustoconical surface and at least two upper frustoconical surfaces above said liquid inlet and wherein the spacing between said lower frustoconical surfaces is greater than the spacing between said upper frustoconical surfaces above said liquid inlet to provide for an increased flow volume of a liquid across said lower frustoconical surfaces as compared with the flow volume of liquid across said upper frustoconical surfaces to ameliorate flooding in said device as a result of liquid recirculating into said device by said means to recirculate liquid.
2. The device as defined in claim 1 wherein said border and first lower frustoconical said surface converge radially outward whereby said border is substantially parallel to a surface of a liquid passing over said frustoconical surface.
3. The device as defined in claim 1 wherein there is more than one cone, each having a frustoconical surface over which liquid can pass and extending inwardly from an inner wall of the housing and disposed so as to be adjacent said distal border and adjustable relative thereto by said relative adjustment to provide a selectable gap.
4. The device as defined in claim 1 wherein said housing is sealed and is operatively coupled with means to recycle a gas and vapour through said device.
5. The device as defined in claim 1 wherein said housing is sealed and operatively coupled to said housing are vacuum pumping means to reduce the pressure of gas vapour in said device and thereby increase separation and efficiency of separation of at least one selected volatile component from a liquid passing through said device.
6. The device as defined in claim 1 wherein said housing is sealed and operatively coupled to means to pump gas and vapour through said device to increase the flow rate of said gas and vapour through said device and thereby increase the separation and efficiency of separation of at least one selected volatile component from a liquid passing through the device.
7. The device as defined in claim 1 wherein the shaft is adjustable along said longitudinal axis of the housing to enable selection of said gap.
8. A system for reducing the alcohol content of an alcohol containing beverage comprising: a source of said beverage; a beverage inlet line coupling said source with a counter-current contacting device; said counter-current contacting device comprising: a housing having a vertical longitudinal axis; a rotatable shaft at least partially disposed within said housing, so as to extend longitudinally thereof, and which is vertically adjustable relative to said housing; at least one inverted cone mounted on said shaft within said housing an having at least one fin extending outwardly from said shaft and mounted along said cone and extending downwardly from said cone to provide a fin distal border; said housing having a first lower frustoconical surface over which the beverage can pass and extending inwardly from the inner wall thereof and disposed so as to be approximately adjacent to said distal border and adjustable relative thereto by said relative adjustment to provide a selectable gap, a motor coupled to said shaft to rotate said shaft; said housing having coupled operatively therewith means to recirculate the beverage passing through the device from at least one liquid outlet associated with said housing to approximately above said first lower frustoconical surface through at least one liquid inlet into said housing, said means to recirculate the beverage including means to heat said beverage prior to its reintroduction into said housing; a second lower frustoconical surface below said first lower frustoconical surface and at least two upper frustoconical surfaces above said liquid inlet and wherein the spacing between said lower frustoconical surfaces is greater than the spacing between said upper frustoconical surfaces above said liquid inlet to provide for an increased flow volume of the beverage across said lower frustoconical surfaces as compared with the flow volume of the beverage across said upper frustoconical surfaces to ameliorate flooding in said device as a result of beverage recirculating into said device by said means to recirculate liquid; a heater operatively associated with said device to heat beverage in the device to an alcohol separating temperature; and a condenser operatively associated with said device to condense alcohol separated from the beverage.
9. The system as defined in claim 8 wherein said border and first lower frustoconical said surface converge radially outward whereby said border to substantially parallel to a surface of a beverage passing over said frustoconical surface.
10. A system for reducing the alcohol content of wine comprising: a source of said wine; a wine inlet line coupling said source with a counter-current contacting device; a wine feeding means operatively associated with the wine inlet line to feed wine from said source through said wine inlet line and into said counter-current contacting device; said counter-current contacting device comprising: a housing having a vertical longitudinal axis; a rotatable shaft at least partially disposed within said housing, so as to extend longitudinally thereof, and which is vertically adjustable relative to said housing; at least one inverted cone mounted on said shaft within said housing and having at least one fin extending outwardly from said shaft and mounted along said cone and extending downwardly from said cone to provide a fin distal border; said housing having a first lower frustoconical surface over which the wine can pass and extending inwardly from the inner wall thereof and disposed so as to be approximately adjacent to said distal border and adjustable relative thereto by said relative adjustment to provide a selectable gap, a motor coupled to said shaft to rotate said shaft; said housing having coupled operatively therewith means to recirculate the wine passing through the device from at least one liquid outlet associated with said housing to approximately above said first lower frustoconical surface through at least one liquid inlet into said housing, said means to recirculate the wine including means to heat said wine prior to its reintroduction into said housing; a second lower frustoconical surface below said first lower frustoconical surface and at least two upper frustoconical surfaces above said liquid inlet and wherein the spacing between said lower frustoconical surfaces is greater than the spacing between said upper frustoconical surfaces above said liquid inlet to provide for an increased flow volume of the wine across said lower frustoconical surfaces as compared with the flow volume of the wine across said upper frustoconical surfaces to ameliorate flooding in said device as a result of wine recirculating into said device by said means to recirculate the wine; a heater operatively associated with said device to heat wine in the device to an alcohol separating temperature; and a condenser operatively associated with said device to condense alcohol separated from the wine.
11. The system as defined in claim 10 wherein said border and first lower frustoconical said surface converge radially outward whereby said border is substantially parallel to a surface of a wine passing over said frustoconical surface.
12. A system for stripping aroma and flavour from a fruit juice comprising: a source of said fruit juice; a fruit juice inlet line coupling said source with a counter-current contacting device; said counter-current contacting device comprising: housing having a vertical longitudinal axis; a rotatable shaft at least partially disposed within said housing, so as to extend longitudinally thereof, and which is vertically adjustable relative to said housing; at least one inverted cone mounted on said shaft within said housing and having at least one fin extending outwardly from said shaft and mounted along with cone and extending downwardly from said done to provide a fin distal border; said housing having a first lower frustoconical surface over which the fruit juice can pass and extending inwardly from the inner wall thereof an disposed so as to be approximately adjacent to said distal border and adjustable relative thereto by said relative adjustment to provide a selectable gap; a motor coupled to said shaft to rotate said shaft; said housing having coupled operatively therewith means to recirculate the fruit juice passing through the device from at least one liquid outlet associated with said housing to approximately above said first lower frustoconical surface through at least one liquid inlet into said housing, said means to recirculate the fruit juice including means to heat said fruit juice prior to its reintroduction into said housing; a second lower frustoconical surface below said first lower frustoconical surface and at least two upper frustoconical surfaces above said liquid inlet and wherein the spacing between said lower frustoconical surface is greater than the spacing between said upper frustoconical surfaces above said liquid inlet to provide for an increased flow volume of the fruit juice across said lower frustoconical surfaces as compared with the flow volume of the fruit juice across said upper frustoconical surfaces to ameliorate flooding in said device as a result of fruit juice recirculating into said device by said means to recirculate the fruit juice; a heater operatively associated with said device to heat fruit juice int he device to an aroma and flavour stripping temperature; and a condenser operatively associated with said device to condense aroma and flavour separated from the fruit juice.
13. The system as defined in claim 12 wherein said border and first lower frustoconical said surface converge radially outward whereby said border is substantially parallel to a surface of a fruit juice passing over said frustoconical surface.
14. A system to desulphuring a liquid containing dissolved sulphur dioxide comprising: a source of said liquid; a liquid inlet line coupling said source with a counter-current contact device; a liquid feeding means operatively associated with the liquid inlet line to feed liquid from said source through said liquid inlet line and into said counter-current contact device; said counter-current contacting device comprising: a housing having a vertical longitudinal axis; a rotatable shaft at least partially disposed within said housing, so as to extend longitudinally thereof, and which is vertically adjustable relative to said housing; at least one inverted cone mounted on said shaft within said housing and having at least one fin extending outwardly from said shaft and mounted along with cone and extending downwardly from said cone to provide a fin distal border; said housing having a first lower frustoconical surface which the liquid can pass and extending inwardly from the inner wall thereof and disposed so as to be approximately adjacent to said distal border and adjustable relative thereto by said relative adjustment to provide a selection gap, a motor coupled to said shaft to rotate said shaft; said housing have coupled operatively therewith means to recirculate the liquid passing through the device from at least one liquid outlet associated with said housing to approximately above said first lower frustoconical surface through at least one liquid inlet into said housing, said mens to recirculate the liquid including means to heat said liquid prior to its reintroduction into said housing; a second lower frustoconical surface below said first lower frustoconical surface and at least two upper frustoconical surfaces above said liquid inlet and wherein the spacing between said lower frustoconical surfaces is greater than the spacing between said upper frustoconical surfaces above said liquid inlet to provide for an increased flow volume of the liquid across said lower frustoconical surfaces as compared with the flow volume of the liquid across said upper frustoconical surfaces to ameliorate flooding in said device as a result of liquid recirculating into said device by said means to recirculate the liquid; and a heater operatively associated with said device to heat liquid in the device to a sulphur dioxide separating temperature.
15. The system as defined in claim 14 wherein said border and first lower frustoconical said surface converge radially outward whereby said border is substantially parallel to a surface of a fruit juice passing over said frustoconical surface.
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