Invention Grant
US09359292B2 Use of an acetic acid/water solvent mixture for the preparation of low-sulfate 5-sulfoisophthalic acid, mono-lithium salt from 5-sulfoisophthalic acid 有权
使用乙酸/水溶剂混合物制备低硫酸盐5-磺基间苯二甲酸,5-磺基间苯二甲酸的单锂盐

Use of an acetic acid/water solvent mixture for the preparation of low-sulfate 5-sulfoisophthalic acid, mono-lithium salt from 5-sulfoisophthalic acid
Abstract:
There is disclosed a process for making a mono-lithium salt of 5-sulfoisophthalic acid (LiSIPA) having less than 200 ppm sulfate. The process uses a reaction mixture of acetic acid, water, a lithium cation producing compound, and 5-sulfoisophthalic acid. The reaction mixture is heated to reflux, cooled, filtered and washed to obtain a high quality LiSIPA having less than 200 ppm sulfate. Also disclosed is a high quality mono-lithium salt of 5-sulfoisophthalic acid having less than 200 ppm sulfate.
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