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. 15, 1986
Filed:
Jun. 27, 1984
Lamberto Crescentini, Chester, VA (US);
William B Fisher, Chester, VA (US);
Richard E Mayer, Richmond, VA (US);
Joseph D DeCaprio, Hopewell, VA (US);
Ronald K Nilsen, Richmond, VA (US);
Allied Corporation, Morris Township, Morris County, NJ (US);
Abstract
This invention is a method to recover caprolactam from a combined stream of mother liquor from a caprolactam crystallizer and other lactam containing aqueous streams, the improvement comprising steam distilling the combined stream at a temperature of from between about 180.degree. C. to 235.degree. C. in the absence of any depolymerization agent such as phosphoric acid; so that the residue from the steam distilling remains fluid; relatively low levels of caprolactam remain in the residue; less residue is generated; the recovered caprolactam has improved high quality; and losses of caprolactam due to side reactions are reduced.