Patent · US Active

Purification of acetic acid from wood acetylation process

US7612232B2 · kind B2 · utility

3Cited by

4References

29Claims

0Family size

Assignee

Celanese International Corporation · US

Inventors

R. Jay Warner · Houston, US
Melchior A. Meilchen · Port Aransas, US
Michael O. Streb · Bad Camberg, DE
Nathan Kirk Powell · Waxahachie, US
Rolf Soellner · Hofheim, DE

Key dates

Filing date	Mar 27, 2008
Grant date	Nov 3, 2009
Priority date	—
Expiry date	Mar 27, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/46
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A method of purifying acetic acid containing terpene and terpenoid impurities, includes: (a) supplying acetic acid containing terpene or terpenoid impurities and water to a distillation column; (b) azeotropically removing terpene or terpenoid impurities from the mixture of acetic acid and water supplied to the column as distillate; and (c) withdrawing a product stream from the column comprising acetic acid purified of terpene or terpenoid impurities. The method is particularly effective for purifying acetic acid recovered from a wood purification process.

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