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:
Apr. 18, 2006
Filed:
Nov. 15, 2000
Applicants:
Michel Fauconet, Valmont, FR;
Stephane Lepizzera, Saint Avold, FR;
Inventors:
Michel Fauconet, Valmont, FR;
Stephane Lepizzera, Saint Avold, FR;
Assignee:
Arkema, Puteaux, FR;
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/34 (2006.01); C07C 51/44 (2006.01); C07C 69/54 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention concerns a method of purifying a (meth) acrylic monomer selected among (meth) acrylic acids and their esters, by distillation in the presence of at least a polymerisation inhibitor requiring input of oxygen and/or an inhibitor having better efficacy in the presence of oxygen for stabilizing the liquid phase. The invention is characterized in that the distillation is performed in the presence of a NOgas, with an oxygen/organic vapor (p/p) ratio ranging between 0.02 and 3%, and with a NOcondensed organic vapor (p/p) ratio ranging between 0.01 and 50 ppm.