The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1998
Filed:
Feb. 02, 1996
Bela Jover, Budapest, HU;
Janos Forstner, Szazhalombatta, HU;
Jozsef Petro, Szazhalombatta, HU;
Szabolcs Szoboszlay, Szazhalombatta, HU;
Imre Fekete, Szazhalombatta, HU;
Karoly Csergo, Szazhalombatta, HU;
Gyula Sztreharszki, Szazhalombatta, HU;
Gyula Raksi, Szazhalombatta, HU;
Janos Kiss, Almasfuzito, HU;
Ferenc Miko, Komarom, HU;
Jeno Baladincz, Komarom, HU;
Jozsef Toth, Komarom, HU;
MOL Magyar Olaj- es Gazipari Rt., Szazhalombatta, HU;
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.