Method for making dimethyl sulfone from dimethyl sulfoxide and hydrogen peroxide

  • US 6,552,231 B2
  • Filed: 07/02/2001
  • Issued: 04/22/2003
  • Est. Priority Date: 07/05/2000
  • Status: Expired due to Fees
First Claim
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1. A method for making crystalline dimethyl sulfone comprising:

  • (a) simultaneously adding dimethyl sulfoxide and an aqueous solution of hydrogen peroxide to a preheated, stainless steel reaction vessel precharged with an aqueous solution of dimethyl sulfone wherein the dimethyl sulfone and aqueous solution of hydrogen peroxide is added at a rate sufficient to maintain the reaction temperature below about 120°

    C. (b) distilling water from the reaction mixture;

    (c) then adding water to the reaction mixture to form a dilute reaction solution;

    (d) heating and filtering the heated dilute reaction solution;

    (e) cooling the dilute reaction solution to crystallize out the dimethyl sulfone; and

    (f) filtering or centrifuging the crystallized dimethyl sulfone.

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