Use of an acetic acid wash to prepare low-sulfate 5-sulfoisophthalic acid, mono-lithium salt
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United States of America Patent
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Nov 11, 2014
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Mar 29, 2011
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Oct 19, 2010
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Abstract
There is disclosed a process for making a mono-lithium salt of 5-sulfoisophthalic acid (LiSIPA) having less than 500 ppm sulfate. The process uses a reaction mixture of water, a lithium cation producing compound, and 5-sulfoisophthalic acid. The reaction mixture is heated to reflux, cooled, filtered and washed with acetic acid to obtain a high quality LiSIPA having less than 500 ppm sulfate. Also disclosed is a high quality, non-purified reaction product containing a mono-lithium salt of 5-sulfoisophthalic acid and having less than 500 ppm sulfate.
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