Method of processing and recirculating filtration residues

Details Method of processing and recirculating filtration residues Method of processing and recirculating filtration residues

1981-02-10

1982-01-12

Therkorn, Ernest G.

Liquid purification or separation

Processes

Separating

210771, 210774, 210777, B01D 4100

Patent

active

043104223

ABSTRACT:
The filter cake resulting from the filtration of tar, pitch, coal extract or coal oil with the help of a filter aid, is dried by blowing an inert gas through it. Thereafter it is comminuted to a particle size of about 0.5 mm and these particles are heated in a fluidized bed at the rate of 1000.degree. C./min to a temperature of 500.degree.-1200.degree. C. There is obtained a size mix of swelled particles from which a fraction having a size of about 0.05-0.3 mm is segregated and recirculated to the filter as a filter aid. Particles having a size above or below the segregated fraction are thermally decomposed, as are gaseous and liquid products which are liberted during the thermal treatment in the fluidized bed.

REFERENCES:
patent: 3306236 (1967-02-01), Campbell
patent: 3549011 (1970-12-01), Marsh
patent: 3856675 (1974-12-01), Sze
patent: 3870632 (1975-03-01), Erskine
patent: 4046690 (1977-09-01), Rodgers
patent: 4157305 (1979-06-01), Muller
patent: 4193206 (1980-03-01), Maffet

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