Process of production of n-alkyl-2-benzthiazolysulfeneimides, device for their production and method of their purification
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United States of America Patent
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Nov 6, 2007
Grant Date -
Oct 21, 2004
app pub date -
Apr 25, 2002
filing date -
Aug 10, 2001
priority date (Note) -
Expired
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Abstract
The solution concerns a process of production of N-alkyl-2-benzthiazolylsulfeneimides by means of a reaction of 2-benzthiazolylsulfenyl chloride with an excess of a corresponding alkylamine in an anhydrous reaction medium. Removement of water and moisture from the reaction medium is ensured by azeotropic distillation of a part of the solvent. The method solves also trapping of the excess amine by extraction with water to recycle it in the process, removing of the unconverted raw material from the crude product by chemical refining with aqueous lye and extraction of by-products and pitches by elutriating the product in an organic solvent with the aim to obtain pure benzthiazolylsulfeneimide containing no less than 95% of the active substance, which can be used as a vulcanization accelerator in ruber mixtures. A device for performing this method consists of a reactor with a multiple propeller mixer on a common shaft
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