subject: Supercritical Carbon Dioxide Can Be Used As The Extraction Solvent [print this page] Carbon dioxide is increasing in popularity amongst coffee manufacturers seeking to move away from a number of the classic decaffeinating solvents of the past, many of which bring about public outcry due to real or perceived risks associated with their use in preparing food. Supercritical CO2 is pushed through the green coffee beans and then they are sprayed with standard water at substantial pressure to get rid of the caffeine. The caffeine may then be separated for reselling (e.g. to the pharmaceutical industry or beverage companies) by moving the water through activated charcoal filters or perhaps by distillation, crystallization or simply reverse osmosis.
Supercritical carbon dioxide can also be used as a far more environmentally friendly solvent for dry cleaning in comparison with more traditional solvents including hydrocarbons and perchloroethylene.
Supercritical carbon dioxide can be used as the extraction solvent with regard to the
production of essential oils and other natural distillates. Cool Clean's essential oils extraction processes using CO2 extraction technology is great for removing precious compounds from a variety of feedstocks, such as odors from flower blossoms, extracts via fruit or perhaps bark as flavorants, extracts out of numerous sources for medical, pharmaceutical requirements or as food preservatives.
CO2's main advantages over chemicals likehexane as well as acetone in this process are that it's non-toxic not to mention non-flammable. Additionally, splitting up of the reaction components from the starting material is significantly less difficult as compared to standard organic solvents, just by allowing it to evaporate into the air recycling it by condensation right into a cold recovery vessel. Its actual edge over steam distillation is it is utilized at a reduced temperature, which can separate the plant waxes out of the oils.
Techniques involving supercritical carbon dioxide to generate micro as well as nano scale particles, usually for pharmaceutical purposes, are currently really being formulated. The gas antisolvent process, quick expansion of supercritical solutions, along with supercritical antisolvent precipitation (along with many affiliated methods) have been shown to process a range ofmaterials directly into particles.
Quite a few in the industry are aware of extraction of compounds implementing supercritical CO2 extraction approaches. Cool Clean Technologies has this capability, but their focus of technology incorporates the utilization of liquid CO2 for the purpose of extraction-which is far more cost-effective in comparison with supercritical.
