Recovery and purification of substituted benzenesulfonates
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United States of America Patent
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Apr 13, 2004
Grant Date -
Dec 19, 2002
app pub date -
May 24, 2002
filing date -
Nov 25, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for recovering and purifying substituted benzenesulfonates, by neutralizing a mixture including at least one substituted benzenesulfonate, or at least one corresponding substituted benzenesulfonic acid, and sulfur trioxide, sulfuric acid and/or hydrogen chloride in free or bound form, in an aqueous phase using an alkali metal hydroxide, and purifying it in this aqueous phase, and by subsequently separating the substituted benzenesulfonate(s) from this aqueous phase. The mixture is comminuted into particles having a Sauter mean diameter in the range from 1 .mu.m to 2 cm, either before or during introduction into this aqueous phase.
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