Process for manufacturing methylene-bis (dibutyl-dithiocarbamate) with ASTM colour less than 2

The invention relates to improved manufacture of methylene bis-(dibutyl-dithiocarbamate) with ASTM coulour 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 stri...

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Main Authors CSERGO; KAROLY, FORSTNER; JANOS, MIKO; FERENC, PETRO; JOZSEF, SZTREHARSZKI; GYULA, BALADINCZ; JENO, TOTH; JOZSEF, RAKSI; GYULA, JOVER; BELA, SZOBOSZLAY; SZABOLCS, KISS; JANOS, FEKETE; IMRE
Format Patent
LanguageEnglish
Published 28.04.1998
Edition6
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
FUELS
LUBRICANTS
LUBRICATING COMPOSITIONS
METALLURGY
ORGANIC CHEMISTRY
PEAT
PETROLEUM, GAS OR COKE INDUSTRIES
TECHNICAL GASES CONTAINING CARBON MONOXIDE
USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Summary:The invention relates to improved manufacture of methylene bis-(dibutyl-dithiocarbamate) with ASTM coulour 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 DEG C. and the vacuum stripping is performed in two steps, first between 45 DEG C. and 100 DEG C. and at a pressure of 5-50 kPa, then phase separation is carried out at a temperature between 35 DEG C. and 50 DEG C., followed by stripping the separated organic phase in vacuum also at a temperature between 45 DEG C. and 100 DEG C. and at a pressure of 5-50 kPa.
Bibliography:Application Number: US19960595286