公开(公告)号：US3773838A

公开(公告)日：1973-11-20

申请号：US3773838D

申请日：1972-02-29

Applicant: INST PRZEMYSLU ORGANICZEGO

Inventor： ANDRUSKI R ,  JEDRASKA M ,  LICHTENSZTEJN H ,  LESZCZYNSKI Z

IPC: C07C317/04 ,  C07C20060101 ,  C07C317/00 ,  C07C147/14

CPC classification number: C07C317/00

Abstract: A METHOD OF PREPARING DIMETHYLSULPHOXIDE BY OXIDIZING DIMETHYL SULPHIDE BY HIGH CONCENTRATED (70-100%) SOLUTIONS OF ORGANIC HYDROPEROXIDES E.G. ISOPROPYLBENZENEHYDROPEROXIDE OR ETHYLBENZENE HYDROPEROXIDE. THE PROCESS IS CARRIED OUT AT TEMPERATURES OF 20* -80* C. IN A TWOPHASE SYSTEM; THE FIRST PHASE IS AN AQUEOUS SOLUTION (1-8 MOLES H2O/MOL DMS) WITH AN ACID REACTION IN WHICH THE HYDROGEN ION CONCENTRATION IS FROM 10-6 TO 1 G./DM.3 SOLUTION, WHILE THE SECOND PHASE IS AN ORGANIC PHASE. EXTRACTION OF DIMETHYLSUPHOXIDE FROM THE REACTION SOLUTION IS EFFECTED BY THE AQUEOUS PHASE AND ANY REMAINING DIMETHYLSULPHOXIDE IN THE ORGANIC PHASE IS OBTAINED BY MEANS OF WASHING WITH AN AQUEOUS SOLUTION OF THE SAME HYDROGEN ION CONCENTRATION AS BEFORE. THE EXTRACTS ARE DISTILLATED UNDER REDUCED PRESSURE GIVING PURE DIMETHYLSULPHOXIDE. THE RAFFINATE IS A READY PRODUCT OR CAN SERVE AS A RAW MATERIAL FOR FURTHER SYNTHESES.