Apparatus for producing aromatic dicarboxylic acids
Patent 4159307 Issued on June 26, 1979. Estimated Expiration Date: 
February 24, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 24, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3093626 3407179 3677714 3721530 Apparatus for continuous liquid-phase oxidation reaction Patent #: 4062654 InventorsAssigneeApplicationNo. 05/771493 filed on 02/24/1977US Classes:422/215, And internal mixing means261/122.1, Submerged screen261/93, Submerged blast261/97, Liquid-flow control422/226, In positive pressure reactor422/231, Gas sparger type mixing means submerged in liquid reactant422/235, And means heating or cooling loop or reaction mass located therein422/236, Including means separating reaction chamber into plural reactant-containing compartments and means moving reactant therebetween422/240, Including specific material of construction562/410, Nitrogen containing oxidant562/414, With recycle or recovery of reaction component562/416Halogen containing catalyst, initiator, or promoter utilizedExaminersPrimary: Marcus, Michael S.Attorney, Agent or FirmInternational ClassesC07C 51/16 (20060101)C07C 51/265 (20060101) B01J 19/18 (20060101) B01J 4/00 (20060101) Foreign Application Priority Data1976-02-24 JPAbstractAn apparatus for producing an aromatic dicarboxylic acid by oxidizing a benzene derivative with molecular oxygen in the liquid phase in a lower aliphatic carboxylic acid as a solvent in the presence of an oxidation catalyst, wherein a starting material liquid e.g., a benzene derivative or a solution thereof in the lower aliphatic carboxylic acid, is fed into the liquid-phase reaction system in a uniformly dispersed state by being passed through a porous material causing the pressure of the starting material liquid just after passing through said porous material to drop more than about 1 kg/m2 in relation to the pressure of the starting material liquid just before passing through said porous material. The resultant aromatic dicarboxylic acid has high purity and has good color. |
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