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. 02, 1997
Filed:
Jun. 21, 1993
Rebecca F Smith, Baton Rouge, LA (US);
Y-D. Mark Chen, Baton Rouge, LA (US);
R Woodrow Wilson, Jr, Baton Rouge, LA (US);
Mayur P Shah, Kenner, LA (US);
Kim R Smith, Huntington, IN (US);
Sharon B McGee, Baton Rouge, LA (US);
Albemarle Corporation, Richmond, VA (US);
Abstract
A highly pure, white, solid amine oxide is prepared in high yield with minimal decomposition of the solvent by (A) reacting a tert-amine with a 15-20% stoichiometric excess of concentrated hydrogen peroxide at 50.degree.-55.degree. C. in the presence of controlled amounts of carbon dioxide and ethyl acetate until the reaction mixture contains 35-45 % by weight of ethyl acetate and less than 0.8% by weight of unreacted amine, (B) catalytically decomposing residual hydrogen peroxide, (C) separating the reaction mixture from the decomposition catalyst, (D) cooling the reaction mixture to 0.degree. C. to form a slurry, (E) centrifuging the slurry to separate the amine oxide, and (F) vacuum drying the amine oxide at ambient temperature--the reaction mixture being diluted to an amine oxide content of 25-30% by weight with additional ethyl acetate or a mixture thereof with a co-solvent, such as a low-boiling n-alkane, after the completion of Step A and prior to the beginning of Step D.