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:
Jul. 31, 2018
Filed:
Jun. 25, 2015
Applicant:
Invista North America S.a.r.l., Wilmington, DE (US);
Inventor:
William J. Tenn, III, Beaumont, TX (US);
Assignee:
INVISTA NORTH AMERICA S.A.R.L., Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 209/48 (2006.01); C07C 253/10 (2006.01); C07C 253/34 (2006.01);
U.S. Cl.
CPC ...
C07C 209/48 (2013.01); C07C 253/10 (2013.01); C07C 253/34 (2013.01);
Abstract
Phosphorus-containing ligands are recovered from mixtures comprising 3-pentenenitrile (3PN) and adiponitrile (ADN), using liquid-liquid extraction. ADN is produced by hydrocyanation of 3PN. The ADN is hydrogenated to produce a hexamethyiene diamine (HMD) and at least one byproduct including bis-hexamethylene triamine (BHMT) or 1,2-diaminocyclohexane. At least a portion of the HMD product or byproduct is used to enhance the liquid-liquid extraction to recover phosphorus-containing ligand.