Process for separating sulphuric acid and nitric acid from dinitrotoluene mixtures obtained during the nitration of toluene

US5001286A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harro Witt · Kuden, DE
• Heiko Beckhaus · Leverkusen, DE

Key dates

• Filing date: Feb 12, 1988
• Grant date: Mar 19, 1991
• Expiry date: Feb 12, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Sulphuric and nitric acids present in dinitrotoluene are separated from the dinitrotoluene by adding up to 10 wt. % water (based on quantity of dinitrotoluene) to the mixture of dinitrotoluene, sulphuric acid and nitric acid, mixing and separating the aqueous phase containing nitric and sulphuric acids. The mixtures treated by this process generally contain up to 5 wt. % nitric acid and up to 6 wt. % sulphuric acid.