Crystallization of water-insoluble dicarboxylic acid Patent #: 5149867
ApplicationNo. 900593 filed on 06/18/1992
US Classes:562/413, Multistage562/421, Air, oxygen, or ozone oxidant562/487By reaction of undesired component
ExaminersPrimary: Dees, Jose G.
Assistant: Clarke, Vera C.
Attorney, Agent or Firm
Foreign Patent References
International ClassesC07C 051/23
AbstractDisclosed is a method for preparing an aromatic carboxylic acid comprising oxidizing in the liquid phase an aromatic feed compound containing at least one alkyl or acyl group with a molecular oxygen-containing gas, in a solvent comprising a low molecular weight aliphatic carboxylic acid, and in the presence of a heavy metal oxidation catalyst, thereby forming an oxidation reaction product mixture comprising an aromatic carboxylic acid; subsequently heating the oxidation reaction product mixture at a temperature of at least about 500° F. to form a second product mixture; and recovering from the second product mixture the aromatic carboxylic acid. The method of this invention provides for purer, larger particle size aromatic carboxylic acid product.