Food or edible material: processes – compositions – and products – Processes – Extraction utilizing liquid as extracting medium
Patent
1993-05-05
1994-08-16
Golian, Joseph
Food or edible material: processes, compositions, and products
Processes
Extraction utilizing liquid as extracting medium
A23F 520
Patent
active
053385756
ABSTRACT:
A process for decaffeinating raw coffee by selective extraction of the caffeine by means of a solvent that is liquid under normal conditions. Raw coffee beans are extracted for between one and several hours by means of a liquid solvent that is comprised of water and that has been saturated with carbon dioxide or other suitable gas or gas mixture at a temperature of between about 20.degree. C. and 110.degree. C. and a pressure of between about 30 bar and 300 bar to provide a charged liquid solvent. The pressure is reduced abruptly or within a few minutes to a pressure between about 1 bar and 10 bar to expand the raw coffee beans. The expanded raw coffee beans are rinsed in the liquid solvent for a period of between a few minutes and two hours. The expanded raw coffee beans are dried to reduce the water content to that required for subsequent roasting, and the decaffeinated and pre-dried raw coffee beans are then roasted, after which the caffeine is selectively separated from the charged liquid solvent and the caffeine is recovered in pure crystalline form.
Ben-Nasr Hedi
Coenen Hubert
Golian Joseph
Kohiensaure-werke Rud. Buse GmbH & Co.
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