Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR DISTILLING DIMETHYLSULFOXIDE AND MULTISTAGE DISTILLATION COLUMN
Document Type and Number:
WIPO Patent Application WO/2018/189969
Kind Code:
A1
Abstract:
The present invention is a method for distilling a liquid containing dimethylsulfoxide using a distillation apparatus, wherein: (1) assuming the total of the liquid containing dimethylsulfoxide at the bottom of the distillation apparatus and the sodium carbonate to be 100 wt%, 0.005-25 wt% of sodium carbonate is mixed with the liquid containing dimethylsulfoxide at the bottom of the distillation apparatus and the mixture is heated; and (2) distillation of dimethylsulfoxide is performed in which the fraction containing dimethylsulfoxide is obtained from a position that is above the heating unit and lower than the position at which the liquid containing dimethylsulfoxide is introduced. In this method for distilling dimethylsulfoxide, the equipment is compact, and the amount of investment for equipment construction is small. Furthermore, because the temperature of the process liquid and steam in the distillation column rises, energy can be reutilized by recovery of this sensible heat and latent heat, and the amount of energy used in the equipment as a whole can be decreased. As a result, the purification cost is low, and it is possible to purify dimethylsulfoxide by distillation economically. The dimethylsulfoxide obtained by this method for distilling dimethylsulfoxide contains few impurities and is highly pure.

Inventors:
ICHIOKA, Ryoji (Toray Fine Chemicals Co. Ltd., 31, Shinpo-machi, Tokai-sh, Aichi 67, 〒4768567, JP)
MURANO, Haruo (Toray Fine Chemicals Co. Ltd., 2-3, Chigusakaigan, Ichihara-sh, Chiba 96, 〒2990196, JP)
Application Number:
JP2018/000060
Publication Date:
October 18, 2018
Filing Date:
January 05, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TORAY FINE CHEMICALS CO., LTD. (3-1 Kanda-Sudacho 2-chome, Chiyoda-ku Tokyo, 41, 〒1010041, JP)
International Classes:
C07C315/06; B01D3/14; C07C317/04
Domestic Patent References:
WO2017064910A12017-04-20
Foreign References:
CN204342710U2015-05-20
JP2015145359A2015-08-13
JPH0433765U1992-03-19
JP3820721B22006-09-13
JPS601302B21985-01-14
Other References:
SANTOSUSSO, M. THOMAS ET AL.: "Acid Catalysis in Dimethyl Sulfoxide Reactions. A Generally Unrecognized Factor", J. ORG. CHEM., vol. 41, no. 16, August 1976 (1976-08-01), 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)
Download PDF: