Process for the fractional desublimation of pyromellitic acid di

Details Process for the fractional desublimation of pyromellitic acid di Process for the fractional desublimation of pyromellitic acid di

1978-11-17

1981-02-24

Bernstein, Hiram H.

Gas separation

Means within gas stream for conducting concentrate to collector

260707, B01D 702

Patent

active

042525454

ABSTRACT:
A process for the fractional desublimation of pyromellitic acid dianhydride in the form of free-flowing crystals which comprises reducing a reaction gas containing pyromellitic acid dianhydride produced by a chemical reaction which also produces by-products, to a temperature above the thaw point of the by-products but below the desublimation point of pyromellitic acid dianhydride by means of a smooth thermostaticized cooling surface, directing the reaction gases at maximal flow velocities of 3 m/sec parallelly to the cooling surface and separating the fraction of crystals not adhering to the surface.

REFERENCES:
patent: 3609943 (1971-10-01), Richter
patent: 4036594 (1977-07-01), Ibing et al.

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