Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1997-03-27
1999-07-13
Barts, Samuel
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562542, C07C 5131, C07C 5116
Patent
active
059229080
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.
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E. Sorribes et al., "Formacion de neuvas fases en el proceso de obtencion de acido adipico: causas y efectos que provocan," Rev. R. Acad. Cienc. Exactas, Fis. Nat. Madrid (1987), 81 (1),223-5 (+ English language translation).
Aldrich Sharon Marie
Dassel Mark William
DeCoster David Cole
Rostami Ader Meherban
Vassiliou Eustathios
Barts Samuel
Keys Rosalynd
Twenty-First Century Research Corporation
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