PROCESS FOR PREPARING LONG-CHAIN DICARBOXYLIC ACIDS AND THE PRODUCTION THEREOF
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United States of America Patent
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Issued Date -
May 9, 2013
app pub date -
Apr 26, 2012
filing date -
Sep 30, 2011
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Abandoned
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Abstract
An organic solvent free method for purifying and refining of a long-chain dicarboxylic acid or a salt thereof is disclosed. This method avoids problems caused by organic solvents which have been used in the purifying process of the prior art. This method reduces effectively the content of such impurities as proteins and coloring materials in the product. The purity of the crystallized long-chain dicarboxylic acid product is greater than 99 wt %.
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