Method of collecting pyromellitic anhydride

Details Method of collecting pyromellitic anhydride Method of collecting pyromellitic anhydride

1987-03-17

1988-02-16

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

549239, 560 78, B01D 702

Patent

active

047252910

ABSTRACT:
A method of collecting pyromellitic anhydride, which comprises introducing a high-temperature gas containing pyromellitic anhydride together with an inert cooling gas into an empty column-type collecting device whose wall temperature is maintained at 150.degree. to 200.degree. C., effecting heat exchange between the high-temperature gas and the cooling gas in the collecting device to lower the temperature of the high-temperature gas to 150.degree. to 200.degree. C., thereafter passing the gaseous mixture through the collecting device at an average linear gas velocity of 0.05 to 0.5 m/sec with an average residence time to 5 to 60 seconds, and recovering needle-like crystals of pyromellitic anhydride from the bottom of the collecting device.

REFERENCES:
patent: 2803311 (1957-08-01), Guidi
patent: 3328428 (1967-06-01), McMahon
patent: 3609943 (1971-10-01), Richter
patent: 4014755 (1977-03-01), Richter
patent: 4036594 (1977-07-01), Ibing et al.
patent: 4119645 (1978-10-01), Auroy et al.
patent: 4252545 (1981-02-01), Haferkorn
patent: 4435581 (1984-03-01), Miserlis
patent: 4598157 (1986-07-01), Scharf

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