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. 11, 2017
Filed:
Oct. 14, 2014
Dow Global Technologies Llc, Midland, MI (US);
Rohm and Haas Company, Philadelphia, PA (US);
Leonard E. Bogan, Jr., Midland, MI (US);
Mark A. Silvano, Upper Black Eddy, PA (US);
Raymond P. Roach, Midland, MI (US);
Sarah M. Hoyt, Greenwood, CO (US);
Robert Tengler, Longmont, CO (US);
David C. Decoster, Lyons, CO (US);
Sanjib Biswas, Midland, MI (US);
Muhunthan Sathiosatham, Chalfont, PA (US);
Sarah L. Hruby, North Wales, PA (US);
Andrew M. Lemonds, Schwenksville, PA (US);
Dow Global Technologies LLC, Midland, MI (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammonium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acrylic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisulfate reduces or eliminates the problems associated with processes that use sulfuric acid as a dehydrating catalyst, e.g, excess sulfuric acid consumption and/or recovery.