Method for preparation of dimethyl terephthalate

US4009199A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Ferdinand List · Marl, DE
• Kurt Wember

Key dates

• Filing date: Jun 20, 1975
• Grant date: Feb 22, 1977
• Expiry date: Jun 20, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J37/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Silica gel esterification catalysts which are mechanically stable and are highly abrasion free, particularly suitable for the esterification of dimethyl terephthalate, are prepared by impregnating silica gel in solutions of aluminum, titanium, zinc and tin compounds, separating the excess solutions and drying at elevated temperatures. The catalysts are further improved by treatment with a gaseous mixture of methanol and water.