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. 12, 2005
Filed:
Jul. 14, 2003
Jaap W. Van Hal, Fresno, TX (US);
Dorai Ramprasad, Allentown, PA (US);
Jaap W. van Hal, Fresno, TX (US);
Dorai Ramprasad, Allentown, PA (US);
Saudi Basic Industries Corporation, Riyadh, SA;
Abstract
Water tolerant Lewis acids are used in a process for the preparation of alkylene glycols by catalytic hydration of the corresponding alkylene oxide. The water tolerant Lewis acids can be a metal salt of a non-coordinating or weakly coordinating anion and a Group IIIB, rare earth or lanthanide, actinide or Group IVB cation. Optionally, carbon oxide may also be present. Examples of such water tolerant Lewis acids are scandium triflate, europium triflate, hafnium triflate, yttrium triflate, lanthanum triflate and ytterbium triflate. The catalyst may contain a coordinating anion instead, examples of which are scandium sulfate [Sc(SO)], scandium chloride [ScCl], scandium acetate [Sc(OAc)] and scandium nitrate [Sc(NO)]. The catalysts may also contain both a non-coordinating or weakly coordinating anion and a coordinating anion, examples of which are scandium triflate sulfate [Sc(CFSO) (SO)], scandium triflate chloride [Sc(CFSO)Cl], scandium triflate acetate [Sc(CFSO)(OAc)] and scandium triflate nitrate [Sc(CFSO)(NO)].