Patent · US Expired

Dimethyl terephthalate prepared by the esterification of terephthalic acid

US3940431A · kind A · utility

7Cited by

5References

9Claims

0Family size

Assignee

Chemische Werke Huels Aktiengesellschaft · US

Inventors

Horst-Dieter Wulf
Ferdinand List · Marl, DE
Kurt Wember
Norbert Wilke

Key dates

Filing date	May 18, 1973
Grant date	Feb 24, 1976
Priority date	—
Expiry date	May 18, 1993

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/584
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Dimethyl terephthalate is prepared by the continuous esterification of terephthalic acid in the gas phase by evaporating solid terephthalic acid in a pre-reactor by means of a hot methanol vapor stream, conducting the gas mixture through a solid bed catalyst in a follow-up reactor, and recirculating a portion of the reaction product to the pre-reactor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.