Closed loop supercritical and subcritical carbon dioxide extraction system for working with multiple compressed gases
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United States of America Patent
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Oct 10, 2017
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Mar 20, 2015
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Apr 3, 2014
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Abstract
A carbon dioxide extraction system which recirculates CO2 and/or other gases in a continuous loop for maximum extraction efficiency and which recovers substantially all gases at the end of the extraction cycle for cost savings and greater workplace safety. The extractor utilizes a dual pumping system which can incorporate high vapor pressure CO2 and/or lower vapor pressure gases such as propane, butane, chemical refrigerants such as R134a, and other lower vapor pressure gases. The system allows the operators to work with supercritical CO2 alone with high pressure liquid pump(s), lower vapor pressure gases alone with modified refrigerant recovery pump(s), or a mixture of CO2 and lower vapor pressure gases using a combination of high pressure liquid pump(s) for extraction and modified refrigerant recovery pump(s) for full recovery of gases at the end of an extraction cycle.
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