- Purification method of rubber vulcanization accelerator 3-methyl-2-thiazolidinethione
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The invention discloses a purification method of a rubber vulcanization accelerator that is 3-methyl-2-thiazolidinethione. The method includes firstly adding N-methyl monoethanolamine that is adopted as a raw materials into a reactor, adding a solvent and a catalyst, starting stirring and reflux condensing, heating, slowly adding carbon disulfide, reacting at a maintained temperature, heating after the reaction to recover unreacted carbon disulfide, heating continuously, reacting at a maintained temperature, cooling after the reaction, performing vacuum distillation to remove the solvent, cooling, adding an alcohol reagent into the distillation residue, crystallizing, centrifuging, performing solid-liquid separation, recovering the alcohol reagent to obtain a wet product, and drying the wet product to obtain a 3-methyl-2-thiazolidinethione product. The method is simple in process. The solvent is easy to recover by vacuum distillation and can be reutilized. The amount of produced three wastes is low. The method meets requirements on energy-saving environmental friendly production.
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Paragraph 0034; 0035
(2016/12/01)
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- Oxidative desulfurization of azole-2-thiones with benzoyl peroxide: Syntheses of ionic liquids and other azolium salts
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1-Alkyl-3-methylimidazole-2-thiones were prepared from amino esters in one pot and converted to inherently halide-free 1-alkyl-3-methylimidazolium benzoates by oxidation with benzoyl peroxide followed by a novel anion exchange. Also reported are the outcomes of exchanges with other anions, acidifications of the imidazolium benzoates to other salts, and extension of the method to the syntheses of 1,3-diphenylimidazolium and 3-methyl- and -butylthiazolium salts. Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
- Wolfe, Derek M.,Schreiner, Peter R.
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p. 2825 - 2838
(2008/03/13)
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- The reaction of 3-methylthiazolium derivatives with superoxide
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3-Methylbenzothiazolium salts were allowed to react with superoxide to afford dimeric bis[o-(N-formyl-N-methylamino)phenyl]disulfides and 3-methyl-2-benzothiazolones. The reaction was applied to monocyclic thiazolium salts, and novel ten-membered ring com
- Itoh, Takashi,Nagata, Kazuhiro,Okada, Mamiko,Ohsawa, Akio
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p. 4859 - 4870
(2007/10/02)
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- REACTION OF N-ALKYLTHIAZOLIUM HALIDES, INCLUDING THIAMINE, WITH SUPEROXIDE ION. CHEMISTRY AND BIOLOGICAL IMPLICATIONS.
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N-alkylthiazolium halides are transformed by KO2 into the corresponding thiazolin-2-ones and thiazolin-2-thiones; the same reactions occur with thiamine, whose thiazolin-2-one pyrophosphate has been reported to be a strong inhibitor of pyruvic dehydrogenase.
- Dondoni, Alessandro,Galliani, Guido,Mastellari, Annarosa,Medici, Alessandro
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p. 2917 - 2920
(2007/10/02)
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