The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 2015
Filed:
Oct. 30, 2009
Christopher H. Jackson, Stockton-on-Tees Cleveland, GB;
Anthony Peter John Limbach, Sowerby Thirsk, GB;
Finbar Gerald Mcdonnell, Guisborough Cleveland, GB;
Alan Macpeherson Ure, Stockton-on-Tees Cleveland, GB;
Christopher H. Jackson, Stockton-on-Tees Cleveland, GB;
Anthony Peter John Limbach, Sowerby Thirsk, GB;
Finbar Gerald McDonnell, Guisborough Cleveland, GB;
Alan MacPeherson Ure, Stockton-on-Tees Cleveland, GB;
INVISTA North America S.a.r.l., Wilmington, DE (US);
Abstract
The present invention relates to a process for production of pure terephthalic acid comprising: a) removing a mother liquor from a terephthalic acid through a filter with a gas, wherein the gas comprises steam at a concentration of least about 50% by volume; b) purifying the gas; and c) recycling the gas purified in step (b) back to step (a).