METHOD OF OBTAINING FISCHER-TROPSCH SYNTHESIS PRODUCT Russian patent published in 2011 - IPC C10G2/00 C07C1/04 C01B3/38 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining a Fischer-Tropsch synthesis product from a gaseous mixture of hydrocarbons containing methane, ethane and, optionally, hydrocarbons with a large number of carbon atoms, in which content of methane is approximately 60 vol. %, via the following steps: (a) adiabatic preliminary reforming of the hydrocarbon mixture in the presence of a reforming catalyst containing oxide carrier material and a metal which is selected from a group comprising Pt, Ni, Ru, Ir, Pd and Co, in order to convert ethane and optional hydrocarbons with a large number of carbon atoms into methane, carbon dioxide and hydrogen, (b) heating the gaseous mixture obtained at step (a) to temperature higher than 650°C, (c) performing non-catalytic incomplete oxidation by bringing the hot mixture from step (b) into contact with an oxygen source in a reactor burner to form a stream coming from the reactor at temperature between 1100 and 1500°C, (d) performing Fischer-Tropsch synthesis using arterial in form of a gas containing hydrogen and carbon monoxide, which is obtained at step (c) and (e) where the synthesis product obtained at step (d) is split into a relatively light stream and a relatively heavy stream. The relatively heavy stream contains a Fischer-Tropsch synthesis product and the relatively light stream contains unconverted synthetic gas, inert substances, carbon dioxide and C₁-C₃ hydrocarbons, and where a first portion of the light stream is recycled to step (a) in order to subject it to preliminary reforming, and where a second portion of the light stream is recycled to the reactor burner at step (c) in order to subject it to incomplete oxidation, and where temperature at step (a) is controlled to provide the amount of the light stream which is recycled to step (a).

EFFECT: method is an improved process of obtaining a Fischer-Tropsch synthesis product where oxygen consumption is low.

10 cl, 1 tbl, 1 ex, 3 dwg