Patent ID: 8241429

Claim:
A method of removing aromatic hydrocarbons from coke oven gas, which comprises the steps of: (a) scrubbing the coke oven gas with a wash liquid comprising biodiesel in a gas scrubber to absorb the aromatic hydrocarbons from the coke oven gas thereby obtaining a wash liquid comprising biodiesel enriched with aromatic hydrocarbons, and removing the wash liquid comprising biodiesel enriched with absorbed aromatic hydrocarbons from the coke oven gas in the gas scrubber; (b) heating the wash liquid comprising biodiesel enriched with absorbed aromatic hydrocarbons to a temperature of between 100 and 250° C., and stripping the aromatic hydrocarbons from the wash liquid comprising biodiesel enriched with aromatic hydrocarbons with water vapor; and (c) following step (b) cooling the wash liquid comprising biodiesel stripped of the aromatic hydrocarbons and returning the wash liquid comprising biodiesel stripped of the aromatic hydrocarbons to the gas scrubber according to step (a).