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. 05, 2020
Filed:
Dec. 08, 2017
Methods of using n-oxyl polymerization inhibitor in a wash settler for preparing methyl methacrylate
Dow Global Technologies Llc, Midland, MI (US);
Rohm and Haas Company, Collegeville, PA (US);
Joseph Atkins, Manvel, TX (US);
Philippe P. Maillot, Kingwood, TX (US);
Joy L. Mendoza, Seabrook, TX (US);
Alan E. Sopchik, Seabrook, TX (US);
Mingyu Ye, Deer Park, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Rohm and Haas Company, Collegeville, PA (US);
Abstract
The present invention provides methods comprising washing or, preferably, washing and neutralizing a sulfur acid containing crude MMA stream to generate a two phase stream containing at least methacrylic acid, methacrylamide (MAM), water and methanol, and an organic component containing methyl methacrylate and thereby form an aqueous component; including in any of the organic component, the aqueous component of a neutralized sulfur acid containing crude methyl methacrylate (MMA) stream or the organic component of a neutralized sulfur acid containing crude methyl methacrylate (MMA) stream one or more N-oxyl compound polymerization inhibitor; followed by separating the aqueous component from the organic component, thereby forming a treated crude MMA stream and an aqueous stream to remove residual (meth) acrylic acid.