Color-stable solution of dimethylaminoacetonitrile in water and process for preparing it

US6504043B2 · kind B2 · utility

Assignee

• Clariant Corporation · DE

Inventors

• Rainer Fell · Marktoberdorf, DE
• Gotz Wilbert · Gersthofen, DE
• Thomas Stahrfeldt · Neusäß, DE

Key dates

• Filing date: Mar 5, 2001
• Grant date: Jan 7, 2003
• Expiry date: Mar 5, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C253/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing a colour-stable, aqueous dimethylaminoacetonitrile solution from a formaldehyde source, dimethylamine and hydrocyanic acid, wherein the reaction mixture contains 2,4-diamino-6-phenyl-1,3,5-triazine(benzoguanamine) in a concentration of from 0.001 to 5% by weight, based on formaldehyde, prior to the reaction and the starting substances are used stoichiometrically or in a ratio of 0.98-1.02 mol of formaldehyde and 0.95-1.10 mol of dimethylamine per mol of hydrocyanic acid. The resulting product remains colour-stable without a further purification step even after prolonged storage.