System for the removal of naphthalene from coke oven gas

Claim 2

The process of claim 2, in which the remaining portion of the naphthalene-enriched primary cooler tar in the scrubbing zone is withdrawn from the scrubbing zone and recirculated directly back to the scrubbing zone for further scrubbing of the gas and in which the recycling and naphthalene-stripped primary cooler tar is continuously added to the recirculating naphthalene-enriched tar in an amount equivalent to that portion being passed to the primary cooling zone.

Claim 3

The process of claim 3, in which the tar is sprayed into the scrubbing zone countercurrent to the flow of gas through the zone and pools in the bottom of the scrubbing zone, so that the gas entering the scrubbing zone first bubbles through the pool of tar before it contacts the spray of tar.

Claim 4

The process of claim 3, in which the naphthalene that is stripped from the primary cooler tar is recycled back to the primary cooling zone.

Claim 5

The process of claim 1, in which the gas is cooled in the primary cooling zone with ammonia liquor.

Claim 6

Apparatus for the primary cooling of coke oven gas and the removal of naphthalene therefrom comprising a primary cooling chamber having a coke oven gas inlet; spray means for introducing a primary cooling liquid into the chamber above the gas inlet to condense primary cooler tar from the gas; means for collecting and withdrawing condensed primary cooler tar from the cooling chamber; means for stripping naphthalene from said condensed primary cooler tar; a scrubbing chamber interconnected with the cooling chamber so that the cooled gas from the cooling chamber passes directly into the scrubbing chamber, said scrubbing chamber having a gas outlet; spray means for introducing substantially naphthalene-free primary cooler tar to the top of the scrubbing chamber to absorb naphthalene from the gas in the scrubbing chamber; means for delivering substantially naphthalene-free primary cooler tar from the stripping means to the spray means of the scrubbing chamber; and means for collecting and discharging the naphthalene-enriched primary cooler tar from said scrubbing chamber.

Claim 7

The apparatus of claim 7, including means for recirculating at least a portion of the naphthalene-enriched primary cooler tar to the spray means of the scrubbing chamber.

Claim 8

The apparatus of claim 7, wherein the scrubbing chamber is located on top of the cooling chamber and is separated therefrom by a gas liquid contact plate.

Claim 9

The apparatus of claim 9, wherein the gas-liquid contact plate is a bubble cap plate permitting the naphthalene-enriched primary cooler tar to pool at the bottom of the scrubbing chamber and to overflow into the cooling chamber, and permitting the cooled coke oven gas to bubble through the pool of tar as it passes into the scrubbing chamber.