CATALYST AND METHOD FOR AROMATISATION OF C-C GASES, LIGHT HYDROCARBON FRACTIONS OF ALIPHATIC ALCOHOLS, AS WELL AS MIXTURES THEREOF Russian patent published in 2015 - IPC B01J29/40 B01J29/80 B01J23/10 B01J21/10 B01J21/12 C01C1/20 

FIELD: chemistry.

SUBSTANCE: invention relates to processing hydrocarbon material, particularly to catalysts and techniques for aromatisation of C₃-C₄ hydrocarbon gases, light low-octane hydrocarbon fractions and oxygen-containing compounds, as well as mixtures thereof to obtain a concentrate of aromatic hydrocarbons. The catalyst contains a mechanical mixture of two zeolites. The first zeolite is characterised by silica modulus SiO₂/Al₂O₃=20. The zeolite is pretreated with aqueous alkali solution and is modified with oxides of rare-earth elements in amount of 0.5-2.0 wt % of the weight of the first zeolite. The second zeolite is characterised by silica modulus SiO₂/Al₂O₃=82. The zeolite contains residual amounts of sodium oxide 0.04 wt % of the weight of the second zeolite and is modified with magnesium oxide in amount of 0.5-5.0 wt % of the weight of the second zeolite. The zeolites are used in weight ratio of 1.7/1 to 2.8/1. The binder contains at least silicon oxide and is used in amount of 20-25 wt % of the weight of the catalyst. The process is carried out using the disclosed catalyst in an isothermic reactor without recycling separation gases by contacting the fixed catalyst bed with gaseous material evaporated and heated in a preheater.

EFFECT: achieving high output of aromatic hydrocarbons with virtually complete conversion of hydrocarbon material and oxygenates, high selectivity with respect to formation of xylenes in the concentrate of aromatic hydrocarbons while simplifying implementation of the process by using low pressure.

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