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. 13, 1999
Filed:
Mar. 27, 1997
Mark William Dassel, Indianola, WA (US);
David Cole DeCoster, Buckley, WA (US);
Ader Meherban Rostami, Bainbridge Island, WA (US);
Sharon Marie Aldrich, Poulsbo, WA (US);
Eustathios Vassiliou, Newark, DE (US);
Twenty-First Century Research Corporation, Newark, DE (US);
Abstract
This invention relates to methods of preparing dibasic acids, such as adipic acid for example, by oxidizing a hydrocarbon with a gas containing an oxidant, preferably oxygen. A respective hydrocarbon is reacted with a gaseous oxidant to form dibasic acid in a mixture which preferably contains a solvent, a catalyst, and an initiator. The temperature of the mixture is then lowered to a point at which solid dibasic acid is precipitated, while maintaining a single liquid phase. At least part of the formed acid is then removed. The lowering of the temperature is preferably performed at least partially by an operation selected from a group consisting of (a) evaporating at least part of the hydrocarbon or otherwise adjusting the hydrocarbon content of the mixture (b) lowering the pressure (c) adding matter having a temperature lower than the initial temperature (d) removing heat by external means (e) removing a first amount of heat by any suitable means, and adding a second amount of heat by external means, the first amount of heat being greater than the second amount of heat, and (f) a combination thereof.