IMPROVED PROCESS FOR THE PREPARATION OF METHYLENE-BIS(DIBUTYL-DITHIOCARBAMATE) WITH ASTM COLOUR LESS THAN 2
The subject-matter of the invention is a process for manufacturing 4,4'-methylene-bis-(dibutyl-dithiocarbamate) with ASTM colour less than 2, by reacting aqueous solutions of dibutyl amine and sodium hydroxide with carbon disulfide at a temperature below 42 DEG C, treating the obtained reaction...
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Main Authors | , , , , , , , , , , , |
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Format | Patent |
Language | English |
Published |
30.06.2000
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Abstract | The subject-matter of the invention is a process for manufacturing 4,4'-methylene-bis-(dibutyl-dithiocarbamate) with ASTM colour less than 2, by reacting aqueous solutions of dibutyl amine and sodium hydroxide with carbon disulfide at a temperature below 42 DEG C, treating the obtained reaction product with methylene dichloride followed by vacuum stripping at a temperature below 122 DEG C and a pressure above 5 kPa, phase separation and filtration of the precipitated sodium chloride, characterized by keeping the temperature of the mixture during the reaction with carbon disulfide at or below 15 DEG C and performing the vacuum stripping in 2 steps, first at a temperature of from 45 DEG C to 100 DEG C and at a pressure of from 5 to 50 kPa, then carrying out the phase separation at 35 DEG C to 50 DEG C, and thereafter performing the second vacuum stripping of the separated organic phase also at a temperature of from 45 DEG C to 100 DEG C and at a pressure of from 5 to 50 kPa. |
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AbstractList | The subject-matter of the invention is a process for manufacturing 4,4'-methylene-bis-(dibutyl-dithiocarbamate) with ASTM colour less than 2, by reacting aqueous solutions of dibutyl amine and sodium hydroxide with carbon disulfide at a temperature below 42 DEG C, treating the obtained reaction product with methylene dichloride followed by vacuum stripping at a temperature below 122 DEG C and a pressure above 5 kPa, phase separation and filtration of the precipitated sodium chloride, characterized by keeping the temperature of the mixture during the reaction with carbon disulfide at or below 15 DEG C and performing the vacuum stripping in 2 steps, first at a temperature of from 45 DEG C to 100 DEG C and at a pressure of from 5 to 50 kPa, then carrying out the phase separation at 35 DEG C to 50 DEG C, and thereafter performing the second vacuum stripping of the separated organic phase also at a temperature of from 45 DEG C to 100 DEG C and at a pressure of from 5 to 50 kPa. |
Author | JANOS FORSTNER GYULA RAKSI JOZSEF TOTH BELA JOVER GYULA SZTREHARSZKI KAROLY CSERGO IMRE FEKETE JANOS KISS FERENC MIKO JOZSEF PETRO JENO BALADINCZ SZABOLCS SZOBOSZLAY |
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Snippet | The subject-matter of the invention is a process for manufacturing 4,4'-methylene-bis-(dibutyl-dithiocarbamate) with ASTM colour less than 2, by reacting... |
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Title | IMPROVED PROCESS FOR THE PREPARATION OF METHYLENE-BIS(DIBUTYL-DITHIOCARBAMATE) WITH ASTM COLOUR LESS THAN 2 |
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