Method of replacing dispersion medium

A dispersion medium and replacement tank technology, applied in separation methods, chemical instruments and methods, crystallization separation, etc., can solve problems such as difficult operation and distributor blockage
CN101472876AInactive Publication Date: 2009-07-01MITSUBISHI GAS CHEM CO INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI GAS CHEM CO INC
Publication Date
2009-07-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of replacing the first dispersion medium of a raw slurry composed of a first dispersion medium and crystal terephthalic acid with a second dispersion medium. The raw slurry is fed to a vertically extending cylindrical part of cyclone-shaped nozzle disposed in a superior portion of replacement vessel of dispersion medium replacing apparatus from its tangential direction and undergoes circular motion along the inner wall surface of the cylindrical part. The raw slurry in circular motion is discharged from an opening disposed in a vertically inferior portion of the cylindrical part and dispersed in a second dispersion medium fed from an inferior portion of the replacement vessel. The slurry after replacement composed mainly of crystal terephthalic acid and the second dispersion medium is drawn out from the inferior portion of the replacement vessel, while the first dispersion medium is drawn out from the superior portion of the replacement vessel.
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Description

technical field

[0001] The present invention relates to a method for replacing the first dispersion medium in the raw slurry containing the first dispersion medium and terephthalic acid crystals with the second dispersion medium. More specifically, it relates to the raw slurry containing the first dispersion medium and terephthalic acid crystals obtained through liquid-phase oxidation reaction or obtained through catalytic hydrogenation treatment or recrystallization treatment of crude terephthalic acid, which contains many impurities A dispersion medium replacement method in which the first dispersion medium is efficiently replaced by the second dispersion medium, and this method is suitable for the preparation of high-purity terephthalic acid. Background technique

[0002] Terephthalic acid is produced by liquid-phase oxidation of p-phenylene compounds such as p-alkylbenzene represented by p-xylene. Usually using acetic acid as a solvent, in the presence of a catalyst suc...

Claims

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