CATALYST AND METHOD FOR AROMATIZATION OF C3-C4 GASES, LIGHT HYDROCARBON FRACTIONS AND ALIPHATIC ALCOHOLS, AS WELL AS MIXTURES THEREOF

The invention relates to hydrocarbon feedstock processing technology, in particular, to catalysts and technology for aromatization of C3-C4 hydrocarbon gases, light low-octane hydrocarbon fractions and oxygen-containing compounds (C1-C3 aliphatic alcohols), as well as mixtures thereof resulting in producing an aromatic hydrocarbon concentrate (AHCC). The catalyst comprises a mechanical mixture of 2 zeolites, one of which is characterized by the silica/alumina ratio SiO2/Al2O3=20, pre-treated with an aqueous alkali solution and modified with oxides of rare-earth elements used in the amount from 0.5 to 2.0 wt% based on the weight of the first zeolite. The second zeolite is characterized by the silica/alumina ratio SiO2/Al2O3=82, comprises sodium oxide residual amounts of 0.04 wt% based on the weight of the second zeolite, and is modified with magnesium oxide in the amount from 0.5 to 5.0 wt% based on the weight of the second zeolite. Furthermore, the zeolites are used in the weight ratio from 1.7:1 to 2.8:1, wherein a binder comprises at least silicon oxide and is used in the amount from 20 to 25 wt% based on the weight of the catalyst. The process is carried out using the proposed catalyst in an isothermal reactor without recirculation of gases from a separation stage, by contacting a fixed catalyst bed with a gaseous feedstock, which was evaporated and heated in a preheater. The technical result consists in achieving a higher aromatic hydrocarbon yield while ensuring almost complete conversion of the HC feedstock and oxygenates, an increased selectivity with respect to forming xylols as part of an AHCC, while simultaneously simplifying the technological setup of the process by virtue of using a reduced (inter alia, atmospheric) pressure. L'invention se rapporte aux techniques de transformation de matières premières hydrocarbures, et concerne notamment des catalyseurs et des techniques d'aromatisation de gaz hydrocarbures C3-C4, de fractions hydrocarbures légères à faible octane et de composés contenant de l'oxygène (alcools aliphatiques C1-C3) ainsi que de leurs mélanges afin de produire un concentré d'hydrocarbures aromatiques (CHA). Le catalyseur comprend un mélange mécanique de 2-x zéolites, la première étant caractérisée par un module de silicate SiO2/Al2O3=20, obtenue par une solution aqueuse d'alcali et modifiée par des oxydes de métaux des terres rares dans une quantité de 0,5 à 20 % en poids de la première zéolite, tandis que la seconde est caracté