Organic compounds -- part of the class 532-570 series – Organic compounds – Thiocarboxylic acids or salts thereof
Patent
1996-02-02
1998-04-28
Barts, Samuel
Organic compounds -- part of the class 532-570 series
Organic compounds
Thiocarboxylic acids or salts thereof
C07C 5704
Patent
active
057446296
ABSTRACT:
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.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 5-50 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.
REFERENCES:
patent: 3725443 (1973-04-01), Horiie et al.
patent: 4967007 (1990-10-01), Deshmukh et al.
patent: 5015368 (1991-05-01), Di Biase et al.
Baladincz Jeno
Csergo Karoly
Fekete Imre
Forstner Janos
Jover Bela
Barts Samuel
MOL Magyar Olaj- es Gazipari Rt.
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