CA1335055C - Process for mild decaffeination of raw coffee - Google Patents
Process for mild decaffeination of raw coffeeInfo
- Publication number
- CA1335055C CA1335055C CA000580313A CA580313A CA1335055C CA 1335055 C CA1335055 C CA 1335055C CA 000580313 A CA000580313 A CA 000580313A CA 580313 A CA580313 A CA 580313A CA 1335055 C CA1335055 C CA 1335055C
- Authority
- CA
- Canada
- Prior art keywords
- raw coffee
- caffeine
- process steps
- carried out
- inert gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/20—Reducing or removing alkaloid content; Preparations produced thereby; Extracts or infusions thereof
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/20—Reducing or removing alkaloid content; Preparations produced thereby; Extracts or infusions thereof
- A23F5/22—Reducing or removing alkaloid content from coffee extract
- A23F5/223—Reducing or removing alkaloid content from coffee extract using flocculating, precipitating, adsorbing or complex-forming agents, or ion-exchangers
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/20—Reducing or removing alkaloid content; Preparations produced thereby; Extracts or infusions thereof
- A23F5/208—Reducing or removing alkaloid content; Preparations produced thereby; Extracts or infusions thereof by extraction of the beans with water, aqueous solutions without organic or inorganic solvents, or aqueous coffee extract
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Tea And Coffee (AREA)
- Extraction Or Liquid Replacement (AREA)
- Thermistors And Varistors (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The present invention relates to a process for mild decaffeination of raw coffee, comprising the follow-ing process steps:
a) preswelling of the raw coffee;
b) extraction of the caffeine by means of an aqueous solution;
c) adsorption of the caffeine on a pretreated adsorbent; and d) drying of the decaffeinated beans, at least a part of the process steps being carried out with exclusion of oxygen.
a) preswelling of the raw coffee;
b) extraction of the caffeine by means of an aqueous solution;
c) adsorption of the caffeine on a pretreated adsorbent; and d) drying of the decaffeinated beans, at least a part of the process steps being carried out with exclusion of oxygen.
Description
Process for mild decaffeination of raw coffee Description The invention relates to a process for mild decaffeination of raw coffee and to equipment for carry-ing out this process.
In processes currently used for decaffeinating raw coffee, raw coffee beans are contacted with an aqueous solution, the swelling of the beans takin~ place and the caffeine being dissolved out of the beans. Such a pro-cess with diverse aqueous extraction solutions is des-cribed in European Patent 0,008,398. In the simplest case, the swelling and extraction fluid is water. From the extract separated off, caffeine is adsorbed on pre-treated activated carbon. The decaffeinated extract is concentrated, recombined with dried beans and absorbed by the latter. The beans are then dried again to the desired water content.
As the process fluid for the extraction of green coffee, a caffeine-free coffee extract solution can also be used, in which the concentrations of coffee constitu-ents are so high that nothing except caffeine is dissol-ved out of the coffee beans, as a result of the concen-trations in the solution being in equilibrium with the concentrations in the coffee bean (equilibrium solution).
This equilibrium is preserved even if the pretreated activated carbon adsorbs virtually only caffeine from the solution. It then remains only to dry the beans thus treated. Pretreated activated carbon is likewise used for preparing this caffeine-free extract solution.
In the decaffeination process according to Swiss Patent Specification 211,646, water is likewise used as the extraction fluid. The raw coffee beans are heated with water in the presence of the adsorbent, the adsorb-ent being enclosed in a vessel which is permeable forfluid. After the decaffeination is completed, the coffee beans are dried in vacuo by evaporation of the water.
In processes currently used for decaffeinating raw coffee, raw coffee beans are contacted with an aqueous solution, the swelling of the beans takin~ place and the caffeine being dissolved out of the beans. Such a pro-cess with diverse aqueous extraction solutions is des-cribed in European Patent 0,008,398. In the simplest case, the swelling and extraction fluid is water. From the extract separated off, caffeine is adsorbed on pre-treated activated carbon. The decaffeinated extract is concentrated, recombined with dried beans and absorbed by the latter. The beans are then dried again to the desired water content.
As the process fluid for the extraction of green coffee, a caffeine-free coffee extract solution can also be used, in which the concentrations of coffee constitu-ents are so high that nothing except caffeine is dissol-ved out of the coffee beans, as a result of the concen-trations in the solution being in equilibrium with the concentrations in the coffee bean (equilibrium solution).
This equilibrium is preserved even if the pretreated activated carbon adsorbs virtually only caffeine from the solution. It then remains only to dry the beans thus treated. Pretreated activated carbon is likewise used for preparing this caffeine-free extract solution.
In the decaffeination process according to Swiss Patent Specification 211,646, water is likewise used as the extraction fluid. The raw coffee beans are heated with water in the presence of the adsorbent, the adsorb-ent being enclosed in a vessel which is permeable forfluid. After the decaffeination is completed, the coffee beans are dried in vacuo by evaporation of the water.
Decaffeination processes of the type described have the disadvantage that the treated raw coffee beans, after they have been dried to the original moisture con-tent, show a dark discolouration, frequently coupled with S a ~oss of aroma.
In order to overcome these disadvantageous changes, vario-us approaches have been fol~owed in the past:
According to Swiss Patent Specification 211,646, a reducing agent is added to the aqueous extract before the concentration step.
In British Patent Specification Z,076,626, it is proposed that the activated carbon which is used as the adsorbent and which has a basic reaction due to therma~
activation, should be neutralized before use.
In the process according to European Patent 0,040,712, a neutralized activated carbon is likewise used for the adsorption of caffeine from aqueous solution, for the same reasons.
A pretreatment of the activated carbon with acid for exerting a positive influence on the colour of the decaffeinated coffee is also known from European Patent 0,008,398.
However, it has been found that the methods lis-ted give only unsatisfactory results.
The present invention is based on the object of providing a process for mild decaffeination of raw coffee wherein the raw coffee beans do not undergo any disadvan-tageous change with respect to colour and aroma. A
further object of the invention is to be regar~ed as the provision of equipment for carrying out this decaffeina-tion process.
These objects are achieved in a surprisingly simple manner by the characterizing features of Claims 1 and 5.
The advantages achieved by the invention are to be seen essentially in the fact that the raw coffee beans do not suffer any disadvantageous changes in their appearance and aroma as a result of the decaffeination process.
~ - 3 - 1335055 When the decaffeination process is carried out with exclusion of oxygen or in an inert gas atmosphere, the result surprisingly is that the original appearance and aroma of the raw coffee beans are substantially S preserved.
Experiments were carried out which represented the influence of individual processing steps and of the duration of treatment on the colour value of the treated beans. It was found here that even swelling of the raw coffee beans with water and subsequent mild dry-ing at 60C cause a discolouration. The duration of the treatment, which in general is 6 to 12 hours, had by far the greatest influence on the colour of the raw coffee beans. By contrast, the influence of the acid-wash of the activated carbon was negligible (EuropeanPatent 0,040,712). Based on these results and on the fact that decaffeination in an inert gas atmosphere gives more favourable results, the discolouration arising in known processes and also the loss of aroma is ascribed to oxidation of coffee constituents, for example chloro-genic acid and other phenolic compounds. The chemical changes in the constituents can here take place both in the beans themselves and in the extract solution, which contains caffeine and other coffee constituents and, in particular, is subjected to the adsorption step, and if appropriate, also concentrating steps.
Rare gases, nitrogen and carbon dioxide can be used as the inert gases. Preferably, carbon dioxide is used, since - in contrast to nitrogen - it is heavier than air. This property has a process engineering advan-tages.
Details of the process according to the invention are explained in more detail below by way of example:
Example 1:
About 110 9 of Colombian raw coffee were placed into a conical glass flask. The bottom of the glass flask was connected via a hose pump to a glass column which contained about 21 9 of activated carbon (already ~ ~ 4 ~ 1 3 3 5 0 5 5 moist). There was in turn an air-tight hose connection from the bottom of the activated carbon column to the toP
of the conical glass flask.
The apparatus was then flooded with C02 and the air was thus displaced from the system. About 300 9 of e~uilibrium extract were then added and circulated by means of a pump. Circulation was terminated after 6 hours and the raw coffee, now decaffeinated, was dried to its original moisture content within 2 hours in a flui-dized-bed drier at 60C.
The resulting decaffeinated raw coffee beans largely correspond to their original state with respect to colour and aroma.
When the process described in example 1 is car-ried out without flooding with carbon dioxide, decaffein-ated raw coffee beans are obtained which show a substan-tially darker colouration as compared with those obtained in the process according to example 1.
The equipment for carrying out the process accor-ding to the invention consists of mutually communicatingcontainers which can be sealed gas-tight and, in addition to the inlet and outlet lines for extract solutions and the loose material, have-connections for passing inert gas in or through.
Figure 1 shows a diagrammatic illustration of equipment for carrying out the process steps a) to c):
In a conical container 1, raw coffee beans Z are dumped on a screen-like inserted plate 3. The lower part of the container 1, which is formed by side walls, the bottom and the screen-like inserted plate 3, serves as a receiving chamber 4 for extract solution. At its bottom, the container 1 communicates with a pump S, the pressure connection of which leads via a line 6 to a spray head 7 which is located in the upper part of the cylindrical con-tainer 8. The container 8 has a screen-like inserted plate 9, which carries layers of activated carbon 10 as an adsorbent. In the lower region of the container 8, between the screen-like inserted plate and the bottom, there is a receiving chamber 11 for decaffeinated extract solution.
~ - 5 - 133S055 A line leads from the bottom of this container 8 to the spray head 12 in the upper part of the container 1.
Inlet valves for introducing inert gas are fitted in the upper region of each of the containers 1 and 8.
S Before the equipment is put into operation, flooding with carbon dioxide is carried out and the air is thus displaced. When the equipment described is in operation, caffeine-free coffee extract solution is, for example, passed through the spray head 12 onto the raw coffee beans; the extract solution flows through the layer of coffee beans. As a result, the beans swell due to water absorption and caffeine is dissolved out of the beans by the aqueous solution. The caffeine-containing extract passes through the screen-like inserted plate 3 and into the receiving chamber 4, from where it is pumped via line 6 into the cylindrical container 8. The extract rains through the spray head 7 onto the previously mois-tened activated carbon 10. On passing through the acti-vated carbon, caffeine is adsorbed out of the extract.
2û The resulting caffeine-free extract runs through the screen plate 9 and passes into the receiving chamber 11.
From the latter, it is transported through line 15 to the spray head 12 for further extraction of the raw coffee beans. The extract solution is circulated by means of a pump until the desired degree of decaffeination has been reached.
The use of a conical container has proved to be particularly advantageous for the first process step.
Raw coffee beans as delivered usually have a water con-tent of 7 to 15 %. When contacted with an aqueous solu-tion, they absorb water, the volume of the beans being approximately doubled. In order to avoid blockage of the column apparatus, which is normally used for treating the raw coffee beans, it is advantageous to use a container of conical shape at least in the first process step.
This container is preferably constructed as a sector-shaped cell of a rotary extractor. Preferably, the conical container in the first process step can be a sector-shaped cell of a rotary extractor, which has a ~ - 6 - 133505S
multiplicity of similar cells and a stationary slotted bottom. In such a container, two cell walls are at a mutual angle and form a container space which conically widens in the horizontal direction. A rotary extractor comprises several cells which are formed by cell walls extending radially from a common axis above a stationary slotted bottom. In a rotary extractor, the individual cells are rotated with their contents over a stationary slotted bottom which is interrupted by a sector-shaped section, so that the cell contents can drop through down-wards in this section and can be taken away.
The first treatment stage, in which the raw cof-fee is preswollen, is followed by the actual extraction stage which continues over several extraction cells.
Each cell is here associated with a separate receiving chamber. The rotary extractor constructed in this way preferably operates as a continuous percolation apparatus by the crossflow/counterflow process. The extract con-centration thus rises in the individual extraction stages (viewed in the direction opposite to that of coffee trans-port), the preswelling stage at the same time represent-ing a first extraction stage with maximum extract concen-tration and the extraction fluid being taken from this first stage to the adsorber. Preferably, the adsorber is likewise constructed~as a rotary extractor, which not only contains the adsorption stages but in which also the adsorbent is preloaded before the adsorption stages and washed after the adsorption stages. This construction makes it particularly easy to synchronize the extraction equipment with the adsorption equipment.
The preswelling of raw coffee beans can also be carried out in cylindrical containers. However, the loose material must then be kept in motion by special measures during the swelling step. During this motion of the beans, however, fine particles are detached from the surface of the beans (silvery pellicle) which are taken along by the fluid and cause blockage in the downstream activated carbon adsorber.
In order to overcome these disadvantageous changes, vario-us approaches have been fol~owed in the past:
According to Swiss Patent Specification 211,646, a reducing agent is added to the aqueous extract before the concentration step.
In British Patent Specification Z,076,626, it is proposed that the activated carbon which is used as the adsorbent and which has a basic reaction due to therma~
activation, should be neutralized before use.
In the process according to European Patent 0,040,712, a neutralized activated carbon is likewise used for the adsorption of caffeine from aqueous solution, for the same reasons.
A pretreatment of the activated carbon with acid for exerting a positive influence on the colour of the decaffeinated coffee is also known from European Patent 0,008,398.
However, it has been found that the methods lis-ted give only unsatisfactory results.
The present invention is based on the object of providing a process for mild decaffeination of raw coffee wherein the raw coffee beans do not undergo any disadvan-tageous change with respect to colour and aroma. A
further object of the invention is to be regar~ed as the provision of equipment for carrying out this decaffeina-tion process.
These objects are achieved in a surprisingly simple manner by the characterizing features of Claims 1 and 5.
The advantages achieved by the invention are to be seen essentially in the fact that the raw coffee beans do not suffer any disadvantageous changes in their appearance and aroma as a result of the decaffeination process.
~ - 3 - 1335055 When the decaffeination process is carried out with exclusion of oxygen or in an inert gas atmosphere, the result surprisingly is that the original appearance and aroma of the raw coffee beans are substantially S preserved.
Experiments were carried out which represented the influence of individual processing steps and of the duration of treatment on the colour value of the treated beans. It was found here that even swelling of the raw coffee beans with water and subsequent mild dry-ing at 60C cause a discolouration. The duration of the treatment, which in general is 6 to 12 hours, had by far the greatest influence on the colour of the raw coffee beans. By contrast, the influence of the acid-wash of the activated carbon was negligible (EuropeanPatent 0,040,712). Based on these results and on the fact that decaffeination in an inert gas atmosphere gives more favourable results, the discolouration arising in known processes and also the loss of aroma is ascribed to oxidation of coffee constituents, for example chloro-genic acid and other phenolic compounds. The chemical changes in the constituents can here take place both in the beans themselves and in the extract solution, which contains caffeine and other coffee constituents and, in particular, is subjected to the adsorption step, and if appropriate, also concentrating steps.
Rare gases, nitrogen and carbon dioxide can be used as the inert gases. Preferably, carbon dioxide is used, since - in contrast to nitrogen - it is heavier than air. This property has a process engineering advan-tages.
Details of the process according to the invention are explained in more detail below by way of example:
Example 1:
About 110 9 of Colombian raw coffee were placed into a conical glass flask. The bottom of the glass flask was connected via a hose pump to a glass column which contained about 21 9 of activated carbon (already ~ ~ 4 ~ 1 3 3 5 0 5 5 moist). There was in turn an air-tight hose connection from the bottom of the activated carbon column to the toP
of the conical glass flask.
The apparatus was then flooded with C02 and the air was thus displaced from the system. About 300 9 of e~uilibrium extract were then added and circulated by means of a pump. Circulation was terminated after 6 hours and the raw coffee, now decaffeinated, was dried to its original moisture content within 2 hours in a flui-dized-bed drier at 60C.
The resulting decaffeinated raw coffee beans largely correspond to their original state with respect to colour and aroma.
When the process described in example 1 is car-ried out without flooding with carbon dioxide, decaffein-ated raw coffee beans are obtained which show a substan-tially darker colouration as compared with those obtained in the process according to example 1.
The equipment for carrying out the process accor-ding to the invention consists of mutually communicatingcontainers which can be sealed gas-tight and, in addition to the inlet and outlet lines for extract solutions and the loose material, have-connections for passing inert gas in or through.
Figure 1 shows a diagrammatic illustration of equipment for carrying out the process steps a) to c):
In a conical container 1, raw coffee beans Z are dumped on a screen-like inserted plate 3. The lower part of the container 1, which is formed by side walls, the bottom and the screen-like inserted plate 3, serves as a receiving chamber 4 for extract solution. At its bottom, the container 1 communicates with a pump S, the pressure connection of which leads via a line 6 to a spray head 7 which is located in the upper part of the cylindrical con-tainer 8. The container 8 has a screen-like inserted plate 9, which carries layers of activated carbon 10 as an adsorbent. In the lower region of the container 8, between the screen-like inserted plate and the bottom, there is a receiving chamber 11 for decaffeinated extract solution.
~ - 5 - 133S055 A line leads from the bottom of this container 8 to the spray head 12 in the upper part of the container 1.
Inlet valves for introducing inert gas are fitted in the upper region of each of the containers 1 and 8.
S Before the equipment is put into operation, flooding with carbon dioxide is carried out and the air is thus displaced. When the equipment described is in operation, caffeine-free coffee extract solution is, for example, passed through the spray head 12 onto the raw coffee beans; the extract solution flows through the layer of coffee beans. As a result, the beans swell due to water absorption and caffeine is dissolved out of the beans by the aqueous solution. The caffeine-containing extract passes through the screen-like inserted plate 3 and into the receiving chamber 4, from where it is pumped via line 6 into the cylindrical container 8. The extract rains through the spray head 7 onto the previously mois-tened activated carbon 10. On passing through the acti-vated carbon, caffeine is adsorbed out of the extract.
2û The resulting caffeine-free extract runs through the screen plate 9 and passes into the receiving chamber 11.
From the latter, it is transported through line 15 to the spray head 12 for further extraction of the raw coffee beans. The extract solution is circulated by means of a pump until the desired degree of decaffeination has been reached.
The use of a conical container has proved to be particularly advantageous for the first process step.
Raw coffee beans as delivered usually have a water con-tent of 7 to 15 %. When contacted with an aqueous solu-tion, they absorb water, the volume of the beans being approximately doubled. In order to avoid blockage of the column apparatus, which is normally used for treating the raw coffee beans, it is advantageous to use a container of conical shape at least in the first process step.
This container is preferably constructed as a sector-shaped cell of a rotary extractor. Preferably, the conical container in the first process step can be a sector-shaped cell of a rotary extractor, which has a ~ - 6 - 133505S
multiplicity of similar cells and a stationary slotted bottom. In such a container, two cell walls are at a mutual angle and form a container space which conically widens in the horizontal direction. A rotary extractor comprises several cells which are formed by cell walls extending radially from a common axis above a stationary slotted bottom. In a rotary extractor, the individual cells are rotated with their contents over a stationary slotted bottom which is interrupted by a sector-shaped section, so that the cell contents can drop through down-wards in this section and can be taken away.
The first treatment stage, in which the raw cof-fee is preswollen, is followed by the actual extraction stage which continues over several extraction cells.
Each cell is here associated with a separate receiving chamber. The rotary extractor constructed in this way preferably operates as a continuous percolation apparatus by the crossflow/counterflow process. The extract con-centration thus rises in the individual extraction stages (viewed in the direction opposite to that of coffee trans-port), the preswelling stage at the same time represent-ing a first extraction stage with maximum extract concen-tration and the extraction fluid being taken from this first stage to the adsorber. Preferably, the adsorber is likewise constructed~as a rotary extractor, which not only contains the adsorption stages but in which also the adsorbent is preloaded before the adsorption stages and washed after the adsorption stages. This construction makes it particularly easy to synchronize the extraction equipment with the adsorption equipment.
The preswelling of raw coffee beans can also be carried out in cylindrical containers. However, the loose material must then be kept in motion by special measures during the swelling step. During this motion of the beans, however, fine particles are detached from the surface of the beans (silvery pellicle) which are taken along by the fluid and cause blockage in the downstream activated carbon adsorber.
Claims (7)
1. Process for mild decaffeination of raw coffee, characterized essentially by the following process steps:
a) preswelling of the raw coffee by means of added swelling fluid;
b) extraction of the caffeine by means of an aqueous solution;
c) adsorption of the caffeine on a pretreated adsorbent; and d) drying of the decaffeinated beans to the original moisture content, at least one of the process steps being carried out with exclusion of oxygen.
a) preswelling of the raw coffee by means of added swelling fluid;
b) extraction of the caffeine by means of an aqueous solution;
c) adsorption of the caffeine on a pretreated adsorbent; and d) drying of the decaffeinated beans to the original moisture content, at least one of the process steps being carried out with exclusion of oxygen.
2. Process according to Claim 1, characterized in that all the process steps are carried out in an inert gas atmosphere.
3. Process according to Claim 1, characterized in that the process steps a) to c) are carried out in an inert gas atmosphere.
4. Process according to Claims 1, 2 or 3, characterized in that carbon dioxide, nitrogen or a rare gas is used as the inert gas.
5. Equipment for carrying out the process according to Claims 1, 2 or 3, consisting of various, mutually communicating containers, characterized in that at least the containers, in which process steps are carried out with exclusion of oxygen, can be sealed gas-tight and, in addition to the inlet and outlet lines for the aqueous solutions and the loose material, have connections for passing inert gas in or through.
6. Equipment according to Claim 5, characterized in that at least the container for carrying out process step a) is of conical shape.
7. Equipment according to Claim 5, characterized in that the containers are shaped as segments of a rotary extractor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873736322 DE3736322A1 (en) | 1987-10-27 | 1987-10-27 | METHOD FOR CAREFULLY DECAFFINATING RAW COFFEE |
| DEP3736322.0 | 1987-10-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1335055C true CA1335055C (en) | 1995-04-04 |
Family
ID=6339170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000580313A Expired - Fee Related CA1335055C (en) | 1987-10-27 | 1988-10-17 | Process for mild decaffeination of raw coffee |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0313921B1 (en) |
| JP (1) | JPH0661218B2 (en) |
| KR (1) | KR930002563B1 (en) |
| AT (1) | ATE86439T1 (en) |
| BR (1) | BR8805541A (en) |
| CA (1) | CA1335055C (en) |
| DE (2) | DE3736322A1 (en) |
| ES (1) | ES2039544T3 (en) |
| GR (1) | GR3007367T3 (en) |
| MX (1) | MX173832B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4003483A1 (en) * | 1989-02-09 | 1990-08-16 | Schoeller Bleckmann Stahlwerke | Caffeine removal from raw coffee - by extn. with supercritical carbon di:oxide super-satd. with water |
| DE4000474A1 (en) * | 1990-01-10 | 1990-11-15 | Ben Nasr Hedi Dr | METHOD FOR QUASICONTINUALLY DECOFFINATING RAW COFFEE |
| DE4010826A1 (en) * | 1990-04-04 | 1991-10-17 | Jacobs Suchard Ag | Decaffeinating process, esp. for liq. raw coffee extract |
| JP4667318B2 (en) * | 2005-07-29 | 2011-04-13 | 花王株式会社 | Method for producing coffee composition |
| CN107233747A (en) * | 2017-07-18 | 2017-10-10 | 汇森生物设备镇江有限公司 | Medicinal extractor in one kind |
| EP3858146A1 (en) | 2020-01-28 | 2021-08-04 | ANKA Angewandte Kaffeetechnologie GmbH | Method for the production of decaffeinated green coffee beans, decaffeinated roasted coffee beans or preparations produced therefrom, corresponding decaffeinated green coffee bean, decaffeinated roasted coffee bean and preparation prepared therefrom, corresponding uses and corresponding systems |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR12612E (en) * | 1909-11-11 | 1910-10-20 | Louis Klein | Process for obtaining caffeine-free coffee beans |
| FR779451A (en) * | 1933-09-08 | 1935-04-05 | Coffex A G Soc | Method and apparatus for decaffeinating and improving green coffee |
| CH239206A (en) * | 1945-04-12 | 1945-09-30 | Forster Otto | Process and device for the production of decaffeinated coffee. |
| LU41310A1 (en) * | 1961-03-03 | 1963-08-28 | ||
| DE2212281C3 (en) * | 1972-03-14 | 1978-11-18 | Hag Ag | PROCESS FOR DECOFFEINATING RAW COFFEE |
| DE2450978A1 (en) * | 1974-10-26 | 1976-04-29 | Helmut Dallinga | Caffeine extraction from coffee by solvent treatment - esp. coffee beans without alteration of taste or aroma |
| CH635485A5 (en) * | 1978-08-22 | 1983-04-15 | Coffex Ag | METHOD FOR DECOFFINATING RAW COFFEE. |
| JPS5633395A (en) * | 1979-08-23 | 1981-04-03 | Uemura Koichi | Continuous traction method and its device |
| US4495210A (en) * | 1980-05-28 | 1985-01-22 | Societe D'assistance Technique Pour Produits Nestle S.A. | Caffeine adsorption |
| IT1151746B (en) * | 1982-04-27 | 1986-12-24 | Illycaffe Spa | PROCESS FOR THE PROCESSING OF ROASTED COFFEE AND PLANT TO IMPLEMENT THE PROCESS |
| JPS5946576A (en) * | 1982-09-09 | 1984-03-15 | Seiko Instr & Electronics Ltd | Display terminal connection structure for electronic time piece |
| DE3735636A1 (en) * | 1987-10-21 | 1989-05-03 | Jacobs Suchard Gmbh | DEVICE FOR CONTINUOUSLY DECAFFINATING RAW COFFEE |
-
1987
- 1987-10-27 DE DE19873736322 patent/DE3736322A1/en not_active Withdrawn
-
1988
- 1988-10-03 MX MX013263A patent/MX173832B/en unknown
- 1988-10-13 DE DE8888116973T patent/DE3879093D1/en not_active Expired - Fee Related
- 1988-10-13 AT AT88116973T patent/ATE86439T1/en not_active IP Right Cessation
- 1988-10-13 EP EP88116973A patent/EP0313921B1/en not_active Expired - Lifetime
- 1988-10-13 ES ES198888116973T patent/ES2039544T3/en not_active Expired - Lifetime
- 1988-10-17 CA CA000580313A patent/CA1335055C/en not_active Expired - Fee Related
- 1988-10-17 KR KR1019880013521A patent/KR930002563B1/en not_active IP Right Cessation
- 1988-10-20 JP JP63263046A patent/JPH0661218B2/en not_active Expired - Lifetime
- 1988-10-27 BR BR8805541A patent/BR8805541A/en not_active Application Discontinuation
-
1993
- 1993-03-16 GR GR930400574T patent/GR3007367T3/el unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01141551A (en) | 1989-06-02 |
| EP0313921A3 (en) | 1990-05-09 |
| BR8805541A (en) | 1989-07-11 |
| KR930002563B1 (en) | 1993-04-03 |
| ES2039544T3 (en) | 1993-10-01 |
| MX173832B (en) | 1994-03-30 |
| EP0313921B1 (en) | 1993-03-10 |
| DE3879093D1 (en) | 1993-04-15 |
| DE3736322A1 (en) | 1989-05-11 |
| GR3007367T3 (en) | 1993-07-30 |
| KR890006156A (en) | 1989-06-12 |
| JPH0661218B2 (en) | 1994-08-17 |
| EP0313921A2 (en) | 1989-05-03 |
| ATE86439T1 (en) | 1993-03-15 |
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