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:
Jan. 17, 2012
Filed:
Jan. 27, 2009
Applicants:
Jean-michel Paul, Metz, FR;
Serge Tretjak, Roulhing, FR;
Inventors:
Jean-Michel Paul, Metz, FR;
Serge Tretjak, Roulhing, FR;
Assignee:
Arkema France, Colombes, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/56 (2006.01); C07C 53/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to an improved method for preparing (meth)acrylic anhydride (A(M)AO) by transanhydrification between (meth)acrylic acid and acetic anhydride in the presence of at least one polymerization inhibitor, in which reaction to the point of partial conversion of the reagents is carried out, followed by continuous distillation. With the method according to the invention, it is possible to produce I1A(M)AO of very high purity under improved productivity conditions compared to existing methods while eliminating problems of reactor fouling.