METHOD FOR OBTAINING SYNTHETIC HYDROCARBONS FROM HYDROCARBON GASES Russian patent published in 2010 - IPC C07C1/04 C07C9/14 C07C9/22 C10G2/00 

FIELD: chemistry.

SUBSTANCE: method of obtaining synthetic liquid hydrocarbons from hydrocarbon gases involves catalytic vapour-carbon dioxide conversion of the starting material and recycled products with supply of high-grade heat and obtaining synthetic gas, catalytic processing of the synthetic gas using a Fischer-Tropsch method while tapping low-grade heat through evaporation cooling, division of products obtained from processing synthetic gas into three streams: a mixture of liquid hydrocarbons, water and exhaust gases, and subsequent division of the obtained mixture of liquid hydrocarbons into a fraction of commercial grade hydrocarbons (petrol, kerosene, diesel fuel) and C₂₁₊ hydrocarbons, distinguished by that starting gaseous material fed at constant pressure of 0.8-3.0 MPa after purification from sulphur compounds is divided into two streams, one of which together with a portion of waste gases from the Fischer-Tropsch synthesis reactor, carbon dioxide, extracted from exhaust flue gases, and water vapour, are fed into a radial-spiral catalytic reactor for vapour-carbon dioxide conversion, which is carried out at temperature 950-1050°C; the obtained synthetic gas is fed into a steam boiler as heating medium, after partial cooling in which the synthetic gas is further cooled to 20-40°C by an external coolant for moisture removal and is separated from moisture in a surface cooler - drier for synthetic gas, after which it is fed into a Fischer-Tropsch synthesis reactor, and the second stream of starting gaseous material is mixed with another portion of exhaust gases from the Fischer-Tropsch synthesis reactor and fed into the burner of the catalytic reactor as fuel, where before feeding into the burner, the said mixture and air necessary for combustion are heated in a heat recovery unit through partial cooling of flue gases coming out of the catalytic reactor, after which the flue gases are further cooled by an external coolant for moisture removal in the surface cooler-drier for flue gases, further carbon dioxide is removed from the flue gases and fed into the catalytic reactor for vapour-carbon dioxide conversion, flue gases cooled and purified from carbon dioxide are removed from the installation, and the condensate extracted in cooler-driers for synthetic gas and flue gases, and water obtained after separation of Fischer-Tropsch reaction products are purified in a water treatment unit and taken for steam generation, necessary for vapour-carbon dioxide conversion of the starting gaseous material, into a boiler in which the condensate is heated and evaporated using heat of the synthetic gas.

EFFECT: use of said method enable efficient realisation of the proposed method.

4 cl, 2 dwg