Apparatus for the purification of terephthalic acid dimethyl est

Details Apparatus for the purification of terephthalic acid dimethyl est Apparatus for the purification of terephthalic acid dimethyl est

1976-01-19

1977-08-09

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23283, 134 25R, B01D 900

Patent

active

040407934

ABSTRACT:
A countercurrent washing column adapted to be used in purifying a crude crystalline material with a solvent. A suspension of the crystalline material is fed to the top of the column and flows downwardly therein countercurrent to a washing solvent. A vertically arranged agitator shaft is positioned in the column for axial rotation and carries a plurality of axially spaced paddles. Frusto-conical baffles and guide plates are arranged within the column to cooperate with the paddles to produce radially inward and outward movement of the suspension and solvent as they flow through the column.

REFERENCES:
patent: 2601674 (1952-06-01), Reman
patent: 2850362 (1958-09-01), Scheibel
patent: 3156534 (1964-11-01), Josephson et al.
patent: 3384458 (1968-05-01), McCarthy et al.

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