SU702997A3 - Method of caffeine removal from cffee - Google Patents

Description

(54) METHOD FOR REMOVING COFFEEINE FROM COFFEE

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The invention relates to a coffee processing technique, and more specifically to the removal of caffeine therefrom, and can be used in the food industry.

There is a known method of removing caffeine from coffee by treating wet coffee with wet;} with carbon monoxide and precipitating caffeine on a wet adsorbent 1.

However, the process of removing caffeine from coffee is slow due to the fact that the circulating gas transports a small amount of caffeine to the adsorbent, and the amount of caffeine absorbed by carbon dioxide depends on its residual content in the grains. Enhancing the circulation of the entire medium does not reduce the treatment time.

The aim of the invention is to reduce the processing time. .

This is achieved by mixing moistened coffee with the adsorbent prior to carbon dioxide treatment.

The method is carried out as follows.

Instant coffee with a moisture content of 15-60% and a solid adsorbent, for example

activated carbon is loaded into a high pressure vessel and treated with moist carbon dioxide at a pressure of 120-250 atm and a temperature of 40-100 ° C.

Under the same conditions, a mixture of coffee (moisture 9%), water and an adsorbent (activated carbon) is treated with carbon dioxide.

The described method is applicable to the removal of caffeine in the preparation of ground, roasted and soluble powdered coffee or granulate.

The caffeine content in coffee can be increased to 0.02-0.6%, while the processing of coffee beans is carried out for 10-20 hours, and ground coffee) 5 coffee 2-5 hours.

In the case of processing roasted coffee, carbon dioxide is wet and the activated carbon absorbs both caffeine and aroma.

In addition to activated carbon, as

Claims (1)

20 adsorbent also use activated alumina. with ud. surface 100-350, bleaching clays based on aluminum silicate and / or magnesium, silikagels with a sheet structure having a large surface. After the removal of caffeine from the coffee, the mixture is discharged from the vessel and, using filtering, coffee bt activated carbon is separated, while the grains coffee again) Pyyonshak) ts To its original size. Example 1. 10 kg of instant coffee with a moisture content of 40% is mixed with 7 kg of activated carbon (particle diameter 3 mm) and loaded into a high pressure vessel, bringing the temperature inside the vessel to 80 ° C. Then carbon dioxide is supplied, reaching a pressure of 190 atm. After 15 hours, the carbon dioxide is removed, the mixture is discharged, and the coffee is separated from the activated carbon by filtration..: Coffee contains 0.02% residual caffeine. Example 2. 10 kg of instant coffee with a moisture content of 50% is mixed with 5 kg of activated carbon, as in Example 1. Carbon dioxide is passed through the mixture under a pressure of 240 atm. For 9 hours at a temperature of 90 ° C. The coffee is then separated by a filter from an activated carbon. The residual caffeine content in coffee is 0.05%. No different degrees of decaffeinated coffee are observed in one batch. Example 5. 0, -5 kg of coffee with a moisture content of 40% is mixed with 0.5 kg syLic, agel and exposed to carbon dioxide at 240 atm in an autoclave for 18 hours at a temperature of 80 ° C. After the separation of the silica gel from coffee, the residual caffeine content in the latter is 0.6%. Example 4. 1 kg of raw coffee is grinded with a viscosity of 35% and mixed with 0.5 kg of activated carbon. The mixture is treated in an autoclave with carbon dioxide for 16 hours at a temperature of 80 ° C and 220 atm. After removing the activated carbon from coffee, the moisture content in the latter is 35% and it looks swollen. The residual caffeine content in coffee is 0.0657c. Example 5. I kg of raw coffee with a moisture content of 35% grind and mix with 0.5 kg of activated carbon. The mixture is treated in an autoclave with carbon dioxide for 3 hours at a temperature of 80 ° C and a pressure of 190 atm. The residual caffeine content in purified carbon is 0.032%. Example 6. 1 kg of raw coffee with a moisture content of 55% is ground and mixed with 0.2 kg of activated carbon. The mixture is treated in an autoclave with carbon dioxide at a temperature of 85 ° C and a pressure of 220 atm. The residual caffeine content in purified carbon is 0.036%. Example 7. 1 kg of raw coffee with a moisture content of 9% is ground and mixed with 1 kg of activated carbon, which is moistened with 0.5 kg of water. The mixture is treated with carbon dioxide in an autoclave for 2 hours at a temperature of 80 ° C and a pressure of 200 atm. The residual caffeine content in purified carbon is 0.03%, and the moisture content in coffee is 41%. Claims: A method of removing caffeine from coffee by treating wet coffee with wet carbon dioxide and precipitating caffeine on a wet adsorbent, characterized in that, in order to shorten the processing time, wet carbonated coffee is mixed with the adsorbent before the carbon dioxide treatment. Sources of information taken into account in the examination 1. UK patent No. 1372667, cl. A 2 B, pub. 1974 (prototype).