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Title:
METHOD FOR PURIFYING DIMETHYL SULFOXIDE
Document Type and Number:
WIPO Patent Application WO/2017/098900
Kind Code:
A1
Abstract:
The present invention is a method for purifying dimethyl sulfoxide, comprising distilling a dimethyl sulfoxide-containing liquid in an inert gas atmosphere in the presence of sodium carbonate to distil out dimethyl sulfoxide, wherein the amount of sodium carbonate relative to 100 g of pure dimethyl sulfoxide in a liquid residue after the distillation is 6 times or greater the amount of sodium carbonate relative to 100 g of pure dimethyl sulfoxide in a dimethyl sulfoxide-containing liquid before the distillation. In the method for purifying dimethyl sulfoxide according to the present invention, the degree of decomposition of dimethyl sulfoxide is reduced in a distillate (a main distillate and a previous distillate) after the distillation, as well as a liquid residue after the distillation. Because the degree of decomposition of dimethyl sulfoxide is reduced in a liquid residue after the distillation as well as a liquid during the distillation, it becomes possible to produce dimethyl sulfoxide with high purity by distillation.

Inventors:
MURANO, Haruo (Toray Fine Chemicals Co. Ltd., 2-3, Chigusakaigan, Ichihara-sh, Chiba 96, 〒2990196, JP)
SHIBAYAMA, Katsuhiro (Toray Fine Chemicals Co. Ltd., 2-3, Chigusakaigan, Ichihara-sh, Chiba 96, 〒2990196, JP)
Application Number:
JP2016/084414
Publication Date:
June 15, 2017
Filing Date:
November 21, 2016
Export Citation:
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Assignee:
TORAY FINE CHEMICALS CO., LTD. (3-1 Kanda-Sudacho 2-chome, Chiyoda-ku Tokyo, 41, 〒1010041, JP)
International Classes:
C07C315/06; C07C317/04
Foreign References:
JP2015145359A2015-08-13
JPS3623323B1
Other References:
SANTOSUSSO M. THOMAS ET AL.: "Acid Catalysis in Dimethyl Sulfoxide Reactions. A Generally Unrecognized Factor", J. ORG. CHEM., vol. 41, no. 16, 1976, pages 2762 - 2768, XP055389183, ISSN: 0022-3263
Attorney, Agent or Firm:
ICHIJO, Chikara (Intellectual Property Business Department, Toray Intellectual Property Center Ltd. 1-1, Sonoyama 1-chome, Otsu-sh, Shiga 58, 〒5208558, JP)
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