Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1981-05-18
1982-09-21
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562412, C07C 5142, C07C 5116
Patent
active
043508286
ABSTRACT:
A filter cake of crude isophthalic acid is dispersed as a slurry in acetic acid, and thereafter heated to a temperature bringing about the dissolving of the isophthalic acid. Such hot solution is subjected to very rapid evaporative crystallization in a single crystallization zone maintained at a pressure at which volatilization of the acetic acid occurs and at a temperature within the range of 180.degree.-250.degree. F., the heat input being controlled to promote such very rapid volatilization that more than half of the solvent quickly is volatilized. Moreover, more than half of the isophthalic acid content of the effluent is in the solids suspended in the slurry of such effluent. Because the volatilization is so rapid, only a relatively short residence time in the single crystallization zone is required for obtaining an effluent suitable for transfer to a separation zone. Isophthalic acid crystals are separated from the mother liquor in such separation zone. Such crystals are washed and dried to provide isophthalic acid having a purity and particle size distribution which are superior to typical prior commercial practice. Moreover, the yield is sufficiently to merit engineering approval in view of the simplicity of the process.
REFERENCES:
patent: 3917681 (1975-11-01), Shinn et al.
Hirsig Alan R.
Worrell G. Richard
Atlantic Richfield Company
Siegel Alan
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