Continuous isolation of phthalic anhydride and maleic anhydride

Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound

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203 14, 203 42, 203 71, 203 74, 549250, B01D 334

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045684278

ABSTRACT:
A process for the continuous isolation of phthalic anhydride and maleic anhydride from the reaction gases obtained by catalytic oxidation of o-xylene or naphthalene with air, wherein the reaction gases are treated with a hydrocarbon of boiling range from 115.degree. to 175.degree. C. as the solvent in a column, and are then treated with an organic solvent of boiling range from 180.degree. to 290.degree. C. in a second column, the phthalic anhydride and maleic anhydride being isolated from the liquid bottom product of the first column.

REFERENCES:
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patent: 2683110 (1954-07-01), Rousseau
patent: 2770630 (1956-11-01), Miller
patent: 2893924 (1959-07-01), Courtier
patent: 2942005 (1960-06-01), Brown et al.
patent: 3040060 (1962-06-01), Kulik
patent: 4008255 (1977-02-01), Wirth et al.
patent: 4071540 (1978-01-01), Marquis
patent: 4285871 (1981-08-01), Keunecke et al.
Norman, W. S., Absorption, Distillation and Cooling Towers, John Wiley & Sons Inc., N.Y., 1961, pp. 80-81.

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