Process for treating flushing liquor

Details Process for treating flushing liquor Process for treating flushing liquor

1976-12-27

1978-02-14

Lutter, Frank W.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

208 39, 210 78, 210 83, 210 73R, 210 73W, B01D 3518, C02B 102

Patent

active

040737284

ABSTRACT:
Flushing liquor from a gas main of a coke oven is fed into a preliminary gravity separator to provide an aqueous liquid phase substantially free of tar and solids for reuse as flushing liquid in the gas main. A tar phase obtained from the preliminary gravity separator is fed into a circuit including a centrifuge for three-phase clarification and separation. The circulation in the circuit being at quantities greater than the quantities of the tar phase introduced per unit of time from the gravity separator to obtain a tar surplus which is substantially free of aqueous liquid and thick tar. The tar surplus is removed from the circuit by feeding clean tar from the centrifuge into an overflow tank from where clean tar is reintroduced into the circuit and clean tar is returned to the preliminary gravity separator in controlled response to the tar level therein. The process further includes heating the tar phase in the circuit to a predetermined temperature for optimum three-phase clarification and separation by the centrifuge.

REFERENCES:
patent: 2524859 (1950-10-01), Van Dongen
patent: 3047214 (1962-07-01), Downing
patent: 3208201 (1965-09-01), Oliver

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