Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1978-08-08
1980-07-15
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5142
Patent
active
042129958
ABSTRACT:
A process for treatment by a liquid cyclone for the production of a suspension of terephthalic acid having a reduced impurity content which comprises supplying a fresh and hot lower aliphatic carboxylic acid solvent to a liquid-phase catalytic oxidation product of a p-alkylbenzene or a hot, impurity-containing suspension of terephthalic acid particles in a mother liquor containing a lower aliphatic carboxylic acid solvent, feeding the resulting mixture into a liquid cyclone, treating it in the cyclone at an elevated temperature, withdrawing an impurity-containing liquid composed mainly of said mother liquor from a withdrawal opening provided near one end of the cyclone, and withdrawing a suspension of terephthalic acid particles in a lower aliphatic carboxylic acid solvent consisting mainly of said fresh solvent from a withdrawal opening provided near the other end of the cyclone; wherein a fresh lower aliphatic carboxylic acid solvent is additionally supplied into the cyclone through an opening provided between a position apart from the suspension withdrawal opening of the liquid cyclone toward its mixture-feeding opening by a distance corresponding to about two-thirds of the distance (h.sub.o) from the mixture-feeding opening to the suspension withdrawal opening and a position apart from the suspension withdrawal opening toward its mixture feeding opening by a distance corresponding to about one-tenth of the distance (h.sub.o).
REFERENCES:
patent: 3853924 (1974-12-01), Meyer et al.
Mitsui Petrochemical Industries Ltd.
Siegel Alan
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