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. 19, 1988
Filed:
Sep. 02, 1983
Applicant:
Inventors:
Tom F Corbin, Asheville, NC (US);
Jack A Dellinger, Asheville, NC (US);
Kenneth B Wagener, Asheville, NC (US);
Assignee:
Akzona Incorporated, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; B01D / ; B01D / ;
U.S. Cl.
CPC ...
203 37 ; 203 27 ; 203 35 ; 203 36 ; 540540 ;
Abstract
A method for removing impurities from caprolactam is disclosed. The method comprises the sequential steps of treating the impure caprolactam with phosphorus pentoxide so that the impurities react therewith to form high boiling species and then distilling the so treated impure lactam to recover substantially pure caprolactam as overhead, with the impurities remaining as bottoms.