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. 28, 2002
Filed:
Aug. 10, 1999
Applicant:
Inventors:
Paul R. Kurek, Barrington, IL (US);
Robert R. Frame, Glenview, IL (US);
Assignee:
UOP LLC, Des Plaines, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 7/20 ;
U.S. Cl.
CPC ...
C07C 7/20 ;
Abstract
A process is disclosed for inhibiting the polymerization of vinyl aromatic compounds, such as styrene, during its distillation. The process involves adding a mixture of at least two inhibitors to the vinyl aromatic compound. One such combination is N,N′-di-2-butyl-N,N′,4-dinitroso-1,4-diaminobenzene and dinitrocresol. A stabilizer such as N,N′-di-2-butyl-1,4-diaminobenzene can also be added.