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:
Sep. 21, 1999
Filed:
Jan. 21, 1997
Applicant:
Inventors:
Chi Hung Cheng, Baton Rouge, LA (US);
Gerald M Sulzer, Baton Rouge, LA (US);
Assignee:
Albemarle Corporation, Richmond, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
564 14 ;
Abstract
N-hydrocarbylthiophosphoric triamide is separated or recovered from a liquid mixture comprising N-hydrocarbylthiophosphoric triamide, inert organic solvent, and optionally but preferably, tertiary amine, by continuously introducing a stream of the liquid mixture into a wiped film evaporator operating at a temperature in the range of about 60 to about 140.degree. C., and at a pressure that avoids solids formation on the heating surface of the wiped film evaporator, and continuously collecting the resultant N-hydrocarbylthiophosphoric triamide product.