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:
Jul. 21, 1998
Filed:
Sep. 11, 1995
Darrell Andrew Fisher, Houston, TX (US);
Michael L Karnilaw, Houston, TX (US);
Kenneth Paul Kidwell, League City, TX (US);
Melchior Albert Meilchen, Corpus Christi, TX (US);
Valerie Santillan, Webster, TX (US);
Mark O Scates, Friendswood, TX (US);
G Paull Torrence, Corpus Christi, TX (US);
Richard F Vogel, Jr, League City, TX (US);
R Jay Warner, Corpus Christi, TX (US);
Hoechst Celanese Corporation, Somerville, NJ (US);
Abstract
A process to reduce carbonyl impurities in a carbonylation reaction for the production of acetic acid is described. The methyl iodide recycle stream which is directed to a carbonylation reactor for carbonylating methanol or methyl acetate to acetic acid, is treated to remove carbonyl impurities by reacting the methyl iodide stream formed in the reaction with an aqueous amino compound which reacts with the carbonyls to form water soluble nitrogenous derivatives, separating an organic methyl iodide phase from an aqueous derivative phase and distilling the methyl iodide phase to remove heavier impurities. The treatment of the methyl iodide recycle stream to the carbonylation reactor has been found to greatly reduce the carbonyls present in the acetic acid product. The formation of nitrile from the nitrogenous derivative during distillation may be minimized by adding water to the system.