Process for preparing solid particulate dialkylesters from their corresponding dianhydrides
AssigneeThe Standard Oil Company
InventorsEduard P. Babayan, Douglas G. Soden, Anthony Bosch
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Abstract
A process for producing a dialkyl ester (i.e. BTDE) from its corresponding dianhydride (i.e., BTDA) comprising mixing the dianhydride, an organic solvent, solid catalyst and an alcohol capable of reacting with the dianhydride stirring the solution until the dianhydride and alcohol have reacted to form the dialkyl ester, separating the dialkyl ester from the catalyst and drying the ester to form a solid paticulate product. The product has a purity of over 85%.
Claims14
A method for producing a solid particulate C.sub.1 to C.sub.4 dialkyl esters from its corresponding dianhydride comprising:
- a. mixing the dianhydride, an organic solvent, an alcohol capable of reacting with said dianhydride to produce said dialkyl ester and a catalyst to form a solution wherein said alcohol is present in said solution in an amount sufficient to enable production of said dialkyl ester but insufficient to allow production of substantial amounts of the corresponding trialkyl or tetraalkyl ester;
- b. stirring said solution until said dianhydride has reacted with said alcohol to produce said dialkyl ester;
- c. separating said dialkyl ester from said catalyst;
- and
- d. drying said dialkyl ester to produce a substantially pure particulate product.
A process for producing the solid particulate dimethylester of benzophenonetetracarboxylic acid (BTDE) comprising mixing benzophenonetetracarboxylic dianhydride (BTDA), an organic solvent, methanol and a polymeric organic solid catalyst to form a solution wherein the methanol is present in said solution in an amount sufficient to enable production of the dimethyl ester but insufficient to allow production of substantial amounts of the corresponding trialkyl of tetraalkyl ester, stirring said solution until said methanol has reacted with the BTDA to form BTDE, separating the BTDE from said catalyst, and drying the BTDE to obtain a solid particulate product.
Dependencies are inferred from the claim text.