Oil products derived from diluted pyrolysis gas by continuous mild-temperature pyrolysis coal-tar separation process

A process for recovering oil from pyrolysis vapor phase produced during mild temperature pyrolysis of a low rank coal by simultaneous fractionation of coal-tar-oil liquids, the method comprising:

• extracting the coal-tar-oil in vapor phase as one of the end-product of mild temperature pyrolysis process of a low rank coal using a sweeping gas;
• optimizing the recovered coal-tar-oil from the vapor phase and reduced the amounts of non-condensing gas compounds by sequentially passing the high temperature vapor phase through a plurality of vapor condensing unit such that each vapor condensing unit operates at a defined temperature which is lower than the temperature in preceding vapor condensing unit to condense a fraction of coal-tar-oil liquid;
• wherein each sequential vapor condensing unit separates a different fraction of the coal-tar-oil liquid which has a condensing point within the operating temperature range of corresponding vapor condensing unit.

A system for recovering oil fractions from pyrolysis vapor effluent produced during mild temperature pyrolysis of a low rank coal, the system comprising:

• a pyrolysis system for producing a coal-tar-oil vapor effluent phase as one of the end-product of mild temperature pyrolysis process of a low rank coal using a sweeping gas;
• a plurality of vapor condensing unit arranged sequentially for optimizing the recovered coal-tar-oil from the vapor phase and reducing the amounts of non-condensing gas compounds in the vapor effluent, each of the said plurality of vapor condensing unit operates at a temperature lower than the preceding vapor condensing unit;
• wherein the vapor condensing unit comprises a condensed liquid material that when contacts with the vapor effluents condensed the uncondensed vapor present in the vapor effluent which has a condensation point equivalent to the corresponding vapor condensing unit.