Verfahren zum Reinigen von Rohbenzol durch fraktionierte Kondensation

摘要

Crude benzole is purified and benzole is simultaneously recovered from a coke oven gas by mixing the crude benzole with the hot coke oven gas and fractionally condensing the benzole hydrocarbons by cooling in stages. The crude benzole may be one obtained by washing coke oven gas and recovering from the wash oil. The gas used in the purification is heated by compression and preferably saturated or more than saturated with crude benzole, some of the purified benzole being recycled if necessary to to effect this. The impurities are recovered first during the condensation and part of this fraction may be recycled and the gas containing light oil is then preferably desulphurized before condensing out benzene, toluene, xylene and accompanying aliphatics. The remaining gas is preferably washed with an oil to recover remaining benzole and then dried by cooling; the cooled gas is then used to cool the gas in the condensations by heat exchange. The crude benzole may be added to the gas by injection or by contact in a washer, e.g. containing bubble trays.