Continuous process for the preparation of thiocarboxylate silane

摘要

The invention is directed to a process for the preparation of thiocarboxylate silane comprising reacting an aqueous solution of a salt of a thiocarboxylic acid with a haloalkylalkoxysilane in the presence of a solid supported catalyst. The invention is also directed to a process for the preparation of an aqueous solution of a salt of a thiocarboxylic acid which comprises reacting an aqueous solution of a sulfide and/or hydrosulfide with a carboxylic acid halide and/or acid anhydride.

主权项

1. A process for the continuous preparation of thiocarboxylate silane comprising
(i) continuously feeding into a continuous plug flow reactor containing a solid supported catalyst comprising a salt of a positively charged nitrogen-containing functional group,
(a) an aqueous liquid phase solution of an ammonium or alkali metal salt of thiocarboxylic acid, and(b) a non-aqueous liquid phase haloalkylalkoxysilane: (ii) continuously contacting the aqueous liquid phase solution of the ammonium or alkali metal salt of thiocarboxylate acid (a) with the non-aqueous liquid phase haloalkylalkoxysilane (b) (iii) continuously reacting the ammonium or alkali metal salt of thiocarboxylate acid with the haloalkylalkoxysilane to form a non-aqueous liquid phase thiocarboxylate silane and an aqueous liquid phase solution of the ammonium or alkali metal salt of the halide; (iv) continuously removing from the plug flow reactor the non-aqueous liquid phase thiocarboxylate silane and the aqueous liquid phase solution of the ammonium or alkali metal salt of the halide formed in step (iii); and (v) separating the non-aqueous liquid phase thiocarboxylate silane from the aqueous liquid phase solution of the ammonium or alkali metal salt of the halide formed in step (iv),
to provide a continuous stream of thiocarboxylate silane reaction product.