IMPROVED PROCESS FOR MANUFACTURING METHYLENE-BIS(DIBUTYL-DITHIOCARBAMATE) WITH ASTM COLOUR LESS THAN 2

摘要

The invention relates to improved manufacture of methylene bis-(dibutyl-dithiocarbamate) of the following structure with ASTM colour less than 2, by reacting aqueous solutions of dibutyl amine and sodium hydroxide with carbon disulfide, treating the obtained reaction product with methylene dichloride, followed by vacuum stripping, phase separation and filtration of the precipitated sodium chloride. According to the invention, during reaction with carbon disulfide the temperature of the mixture is kept at or below 15 .degree.C and the vacuum stripping is performed in two steps, first between 45 .degree.C and 100 .degree.C and at a pressure of - 50 kPa, then phase separation is carried out at a temperature between 35 .degree.C and 50 .degree.C, followed by stripping the separated organic phase in vacuum also at a temperature between 45 .degree.C and 100 .degree.C and at a pressure of 5 - 50 kPa: