Methods for preparing polymers from dibasic acids

Details Methods for preparing polymers from dibasic acids Methods for preparing polymers from dibasic acids

1999-05-13

2000-12-05

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528170, 528172, 528183, 528179, 528272, 528274, 528308, 5283086, 528332, 528335, 528336, 528345, C08G 7300, C08G 6302

Patent

active

061568686

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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