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:
Dec. 05, 2017
Filed:
May. 24, 2013
Invista North America S.a.r.l., Wilmington, DE (US);
Sudhir Aki, Katy, TX (US);
William J. Tenn, III, Beaumont, TX (US);
Thomas E. Vos, Beaumont, TX (US);
INVISTA NORTH AMERICA S.A.R.L., Wilmington, DE (US);
Abstract
A process of stabilizing a bidentate or tridentate phosphorus-based phosphite ester ligand or mixture thereof in a hydrocyanation reaction milieu comprising water, wherein the ligand or ligand mixture comprises one or more of (i) a bidentate biphosphite ligand of formula (III), (R—X) (R—X) P—X—Y—X—P(X—R) (X—R) or (ii) a tridentate triphosphite ligand of formula (IIIA) (R—X) (R—X) P—X—Y—X—P(X—R)—(X—Y—R—P(X—R)—(X—R) where each X is oxygen or a bond and each Y is an optionally substituted C6-C20 arylene group, comprising admixing the bidentate and/or tridentate with a stabilizing amount of one or more monodentate phosphite ligand of formula P(X—R)(X—R)(X—R) where each X is oxygen or a bond, wherein the monodentate ligand has a rate of hydrolysis greater than the rate of hydrolysis of the bidentate or tridentate ligand in the presence of water in a hydrocyanation reaction milieu, and thereby preserve concentrations and proportions of the bidentate and/or tridentate ligand(s) in the ligand blend.