Process for the preparation of 2-mercaptobenzothiazole

Details Process for the preparation of 2-mercaptobenzothiazole Process for the preparation of 2-mercaptobenzothiazole

C - Chemistry, Metallurgy

07

D

C07D 277/72 (2006.01)

Patent

CA 2050783

AGW2280 Abstract: The invention relates to a process for the preparation of 2-mercaptobenzothiazole from aniline, sulphur and carbon disulphide under pressure and the separation of the 2-mercaptobenzothiazole from the crude reaction product by cooling and recycling the by-products into the reactor together with aniline, sulphur and carbon disulphide, the reaction being carried out using a residence time in the reactor of at least one hour at temperatures of 220 - 280°C and said reaction being discontinued before the reaction equilibrium is reached and a maximum hydrogen sulphide pressure being maintained on cooling by mixing the crude reaction product with carbon disulphide at above 100°C and the hydrogen sulphide being removed completely only after the crystallisation of the 2-mercaptobenzothiazole.

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