Title:
ENVIRONMENT-FRIENDLY SYNTHESIS METHOD FOR DIBENZOTHIAZOLE DISULFIDE AS RUBBER VULCANIZATION ACCELERATOR
Document Type and Number:
WIPO Patent Application WO/2021/073044
Kind Code:
A1
Abstract:
The present invention discloses an environment-friendly synthesis method for dibenzothiazole disulfide as rubber vulcanization accelerator, belonging to the technical field of chemical engineering. The method specifically is: completely dissolving 2-mercaptobenzothiazole in the sodium carbonate aqueous solution, then dropwise adding hydrogen peroxide, introducing carbon dioxide to adjust the pH of the system, and carrying out oxidation to generate dibenzothiazole disulfide and sodium bicarbonate. The sodium carbonate solution formed by heating the obtained sodium bicarbonate solution can be used for dissolving the raw material 2-mercaptobenzothiazole so as to realize circulation of the raw materials. The purity of the product prepared by the method in the present invention can reach 99% or more, compared with the traditional mixed acid oxidation method, a large amount of salt-containing wastewater is reduced, and the process is environmentally friendly.
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| WO/1998/039329 | AMIDOAROMATIC RING SULFONAMIDE HYDROXAMIC ACID COMPOUNDS |
Inventors:
LUO GUANGSHENG (CN)
TIAN JIAXIN (CN)
WANG KAI (CN)
TIAN JIAXIN (CN)
WANG KAI (CN)
Application Number:
PCT/CN2020/081063
Publication Date:
April 22, 2021
Filing Date:
March 25, 2020
Export Citation:
Assignee:
UNIV TSINGHUA (CN)
International Classes:
C07D277/78; C07D277/70
Foreign References:
| CN110590703A | 2019-12-20 | |||
| CN101928261A | 2010-12-29 | |||
| CN102838559A | 2012-12-26 | |||
| US5998670A | 1999-12-07 |
Other References:
LAN YANG, XUE-XI CHEN, YONG-JIAN ZHU: "Synthesis of Medical Intermediate Dibenzothiazole Disulfide", JOURNAL OF QINGDAO UNIVERSITY OF SCIENCE AND TECHNOLOGY (NATURAL SCIENCE EDITION), QINGDAO-KEJI-DAXUE, CN, vol. 28, no. 4, 1 August 2007 (2007-08-01), CN, pages 283 - 293, XP055802145, ISSN: 1672-6987
CABRERA DAIANE M.L., LÍBERO FRANCIELI M., ALVES DIEGO, PERIN GELSON, LENARDÃO EDER J., JACOB RAQUEL G.: "Glycerol as a recyclable solvent in a microwave-assisted synthesis of disulfides", GREEN CHEMISTRY LETTERS AND REVIEWS, vol. 5, no. 3, 1 September 2012 (2012-09-01), pages 329 - 336, XP055802147, ISSN: 1751-8253, DOI: 10.1080/17518253.2011.631942
CABRERA DAIANE M.L., LÍBERO FRANCIELI M., ALVES DIEGO, PERIN GELSON, LENARDÃO EDER J., JACOB RAQUEL G.: "Glycerol as a recyclable solvent in a microwave-assisted synthesis of disulfides", GREEN CHEMISTRY LETTERS AND REVIEWS, vol. 5, no. 3, 1 September 2012 (2012-09-01), pages 329 - 336, XP055802147, ISSN: 1751-8253, DOI: 10.1080/17518253.2011.631942
Attorney, Agent or Firm:
BEIJING ZHCC INTELLECTUAL PROPERTY CO. (CN)
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