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. 25, 2011
Filed:
Jun. 01, 2009
Keith F. Briegel, Houston, TX (US);
Michael Stanley Decourcy, Houston, TX (US);
James Elder, Houston, TX (US);
James Jerrick Juliette, Houston, TX (US);
Joy Lydon Mendoza, Lansdale, PA (US);
Keith F. Briegel, Houston, TX (US);
Michael Stanley DeCourcy, Houston, TX (US);
James Elder, Houston, TX (US);
James Jerrick Juliette, Houston, TX (US);
Joy Lydon Mendoza, Lansdale, PA (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
The present invention relates to reducing corrosion of distillation equipment during azeotropic distillation of (meth)acrylic acid in the presence of dissolved copper, by providing aqueous (meth)acrylic acid having not more than 0.1% by weight formaldehyde, based on the total weight of the aqueous (meth)acrylic acid. The source of the copper may, for example, be copper-based polymerization inhibitors added to the aqueous (meth)acrylic acid and/or distillation equipment.