| 摘要 |
The invention relates to catalytic conversion of hydrocarbons and can be used for producing a high-octane motor fuel. The inventive aromatic hydrocarbons are produced from paraffin hydrocarbons using a zeolite-containing catalyst. Said catalyst is embodied in the form of a zeolite-containing catalyst ZSM-5 having the residual content of Na 2O equal to or less than 0.1 % and a ratio SiO2/Al2 O3 = 39 ranging from 53.28 to 59.69 mass %, 35.5-37.5 mass % of Al2O3, 2.5-4.5 mass % of Ba2O3, 2.0-4.0 mass % of Zn, O.2-o.5 mass % of Re, 0.01-0.02 mass % of Nd and 0.1-0.2 mass % of K. The inventive method consists in contacting the zeolite-containing catalyst with light sulphur-containing paraffin hydrocarbons C3-C4 (sulphur content ranging from 0.15 to 0.28 mass %) at a temperature of 450-480 DEG C added thereto in such a quantity that the ratio between rhenium content in the zeolite-containing catalyst and sulphur content in sulphur-containing paraffin hydrocarbons is approximately equal (near) to 1.25. Afterwards, an initial raw material in the form of paraffin hydrocarbons is supplied at a temperature ranging from 380 to 580 DEG C, contacting products are divided into liquid and gaseous fractions, said gaseous products are combusted in the presence of full-oxidation catalysts, and 2.0-20.0 mass % of the mixture of carbon dioxide and water steam, which is produced during combustion, is added. Said method makes it possible to increase the output of aromatic hydrocarbons, reduce energy consumption and increase the working cycle duration.
|
