PRODUCTION OF TAR OILS

PURPOSE:To efficiently recover and collect tar oils, by recovering tar oils from a gas which has been produced in the first half period of carbonization from a coke oven gas, recovering a gas which has been produced in the second half period of carbonization through a switching operation and contacting them with coal having a low degree of coalification, thereby causing hydropyrolysis. CONSTITUTION:Coal is carbonized in a carbonization chamber of a chamber type coke oven 1. A tar-contg. gas, as shown in section I, produced in the first half period of the carbonization having a calorific value of 5,000kcal/Nm or more and a hydrogen concn. of 50-55vol% and a methane concn. of 30-35vol% is led to, e.g., a bent portion of a riser where aq. ammonia is sprayed to the gas to recover the gas and tar oils. A gas, as shown in section II, produced in the second half period of carbonization having a hydrogen concn. of 55-90vol%, a methane concn. of 30-0vol% and substantially free from tar is taken out of the coke oven 1 through a switching operation at an appropriate time. The gas thus obtd. is pressurized with a compressor 2 and, if necessary, preheated with a preheater 3. The gas is then led to a reactor 4. Powdery coal having a low degree of carbonization is supplied into the reactor via a feeder 5. In the reactor, the coal is contacted with the gas at 600-1,000 deg.C to cause hydropyrolysis. Char or the like is separated with a char separator 6. Liquid components contg. tar oils, etc., are separated and recovered with a liq. product separator 8 via a cooler 7.