Removing Caffeine by Photo Retouching

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The production process of decaf coffee is mostly the trade secret of various companies, but it is still possible to know the common decaf coffee production methods from the published literature and patents, but the details are unknown. The common way to remove caffeine is to use the "extraction method". Generally, the green coffee beans are extracted to remove the caffeine, and then dried and roasted. Common extraction methods can be roughly divided into three categories: solvent extraction (solvent decaffeination), supercritical fluid extraction (CO 2 decaffeination ) and water treatment. Before the 1970s, decaffeinated coffee was commercially produced and sold using only solvent extraction. Before that, scientists had not yet clearly understood the effects of various solvents on the human body.
Therefore, many solvents that are now considered to have health concerns or carcinogenic risks have been used by manufacturers to extract caffeine, including benzene, chloroform and photo retouching carbon tetrachloride. . However, the most common extraction solvents are dichloromethane and ethyl acetate. According to the different solvents processing steps , extraction solvent can be divided into direct solvent extraction and indirect solvent extraction. Because caffeine is combined with chlorogenic acid (CGA) in the beans, before starting extraction, the dried coffee beans must be saturated with water to separate the two, so that the caffeine molecules can be effectively dissolved.

The direct extraction method is to directly soak the dried green coffee beans with steam and soak them in a solvent. After the caffeine is dissolved,they are taken out and heated to volatilize the solvent and water. The indirect extraction method is to boil the raw beans in hot water to dissolve the caffeine and various odor molecules. The water used to boil the coffee beans is then fully mixed with the solvent to dissolve the caffeine into the solvent. After removing the solvent, use the rest. The green beans are rinsed with fresh water so that the odor molecules can return to the beans, which are finally drained and dried.The green beans are rinsed with fresh water so that the odor molecules can return to the beans, which are finally drained and dried.The green beans are rinsed with fresh water so that the odor molecules can return to the beans, which are finally drained and dried.