Process for the continuous production of alkali salts of the dialkyldithiocarbamic acid

US10836716B2 · kind B2 · utility

Assignee

• EPC Engineering & Technologies GMBH · DE

Inventors

• Jens Henkel · Meuselbach-Schwarzmühle, DE
• Jürgen Rassbach · Arnstadt, DE
• Tobias Przynosz · Saalfeld, DE

Key dates

• Filing date: Apr 10, 2018
• Grant date: Nov 17, 2020
• Expiry date: Apr 10, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C333/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An exemplary process for the production of alkali metal salts of dialkyldithiocarbamic acids produced according to the following steps: i) reaction of one or more dialkylamines, carbon disulphide and alkali metal hydroxides to form alkali metal salts of dialkyldithiocarbamic acids; ii) crystallisation to form a crystal suspension of alkali metal salts of dialkyldithiocarbamic acids; iii) separation of crystals of alkali metal salts of dialkyldithiocarbamic acids from the mother liquor in step ii; (iv) recirculation of the separated mother liquor into the crystallisation process; and v) drying of the alkali metal salts of dialkyldithiocarbamic acids.