Process for the desublimation of phthalic anhydride

Details Process for the desublimation of phthalic anhydride Process for the desublimation of phthalic anhydride

1975-02-14

1977-12-13

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603467, 23264, C07D30789

Patent

active

040628710

ABSTRACT:
In a process for the separation of phthalic anhydride from reaction gas oined from the catalytic air oxidation of o-xylene which comprises cooling the gas in a separator in indirect heat exchange relationship with cooling surfaces inside the separator maintained at 45.degree.-65.degree. C, withdrawing residual reaction gas through a gas outlet and melting off resultant desublimated phthalic anhydride from the cooling surfaces by heating the latter to a temperature in the range of 150.degree.-250.degree. C, the improvement wherein heat is applied to an external surface of the separator adjacent said gas outlet during the cooling of the gas inside the separator, said heat being sufficient to prevent a buildup of non-meltable impurities on the cooling surface inside said separator and adjacent to said gas outlet.

REFERENCES:
patent: 3471521 (1969-10-01), Junker
patent: 3869479 (1975-03-01), Barth et al.

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