Patent · US Expired

Method for producing mixtures of 1,4-butanediol, tetrahydrofuran and &ggr;-butyrolactone

US6433192B1 · kind B1 · utility

16Cited by

6References

10Claims

0Family size

Assignee

BASF SE

Inventors

Rolf Fischer · Heidelberg, DE
Gerd Kaibel · Lampertheim, DE
Rolf Pinkos · Bad Dürkheim, DE
Ralf-Thomas Rahn · Mannheim, DE

Key dates

Filing date	Jun 4, 2001
Grant date	Aug 13, 2002
Priority date	—
Expiry date	Jun 4, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D307/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

In a process for preparing 1,4-butanediol, tetrahydrofuran and &ggr;-butyrolactone by oxidation of butane to give a product stream comprising maleic anhydride, absorption of maleic anhydride from the product stream using a high-boiling alcohol to give a liquid absorption product comprising monoesters and diesters of maleic acid and also high-boiling alcohol, after-esterification of the liquid absorption product and subsequent hydrogenation of the after-esterified product in the liquid phase, the high-boiling alcohol is a polyhydric alcohol having a boiling point at atmospheric pressure of above 233° C. and the after-esterified product has an acid number of less than 30 mg KOH/g and a water content of less than 1% by weight.

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