Process for purification of dimethyl sulphoxide (DMSO)
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United States of America Patent
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May 22, 2001
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N/A
app pub date -
May 14, 1998
filing date -
May 15, 1997
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Abstract
To purify a dimethyl sulphoxide (DMSO), it is placed in contact with a plurality of cation exchange resins at least one of which is a resin of sulphonic type in --SO.sub.3 H or --SO.sub.3 NH.sub.4 form, it being possible for the other or others to be of chelating type. The DMSO thus obtained has an iron cation content lower than 1 ppb and a sodium cation content lower than 2 ppb.
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