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:
Oct. 31, 2006
Filed:
Apr. 22, 2003
Keith Frederick Briegel, Houston, TX (US);
James Clarence Day, North Wales, PA (US);
Michael Stanley Decourcy, Houston, TX (US);
Donald Alan Ebert, Friendswood, TX (US);
Jamie Jerrick John Juliette, Houston, TX (US);
Keith Frederick Briegel, Houston, TX (US);
James Clarence Day, North Wales, PA (US);
Michael Stanley DeCourcy, Houston, TX (US);
Donald Alan Ebert, Friendswood, TX (US);
Jamie Jerrick John Juliette, Houston, TX (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
A process for the high yield production of high purity glacial methacrylic acid ('HPMAA') with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure, specifically 99% pure or greater with a water content of 0.05% or less. This improved process involves the steps of providing a crude MAA stream which was formed by hydrolyzing acetone cyanohydrin and, therefore, includes HIBA which is an intermediate product of the hydrolysis reaction, and purifying that crude methacrylic acid stream in a series of successive distillation steps.