Process for recovering organic acids from aqueous salt solutions
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United States of America Patent
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Jun 4, 1996
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N/A
app pub date -
Feb 28, 1995
filing date -
Feb 28, 1995
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Abstract
A crude aqueous mixture of basic salts of an organic acid, free organic acid, and impurities is mixed with carbon dioxide under pressure and applied to a membrane such as a reverse osmosis or other membrane with small pores while holding the mixture under pressure with well mixed carbon dioxide, such that the free organic acid preferentially permeates the membrane while the impurities and salts of the organic,acid are preferentially but not necessarily completely retained. In The preferred form of the invention a back pressure is maintained on the permeate side of the membrane that is a significant pressure but less than the pressure applied to the feed side. This allows higher levels of acidification to be achieved. This is necessary as many membranes are permeable to CO.sub.2 choices of membrane permeate side pressure, retentate side pressure, and permeate counter flow rate can be used to effect different levels of either purification or concentration or both.
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