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:
May. 25, 2010
Filed:
Sep. 15, 2006
Michael Stanley Decourcy, Houston, TX (US);
James Edward Elder, Houston, TX (US);
Jamie Jerrick John Juliette, Houston, TX (US);
Michael Stanley DeCourcy, Houston, TX (US);
James Edward Elder, Houston, TX (US);
Jamie Jerrick John Juliette, Houston, TX (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
A process is provided herein for the high yield production of high purity glacial methacrylic acid ('HPMAA') that is substantially pure, specifically 99% pure or greater, with water content of 0.05% or less and low levels of other impurities, including HIBA, acrylic acid, MOMPA, methacrolein and others. This improved process comprises providing a crude MAA stream and purifying the crude methacrylic acid stream in a series of successive distillation steps involving two distillation columns. The inventive process is capable producing high purity methacrylic acid product that is especially suitable for the production of specialty MAA polymers.