CATALYST, SYNTHESIS METHOD THEREOF (VERSIONS) AND METHOD FOR LIQUID-PHASE ALKYLATION OF ISOBUTANE WITH C₂-C₄ OLEFINS IN PRESENCE SAID CATALYST

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to petrochemistry, particularly to production of a zeolite-based catalyst for alkylation of isobutane with olefins and can be used in oil refining industry. Described is a zeolite-based catalyst for alkylation of isobutane with olefins which contains aluminium oxide and silicon dioxide with molar ratio of silicon dioxide to aluminium oxide equal to 2.8-7.0, sodium and rare-earth element oxides and active metal oxides in form of platinum oxide and/or palladium oxide and/or rhenium oxide and/or rhodium oxide and/or halogen - chlorine or fluorine, with the following ratio of components in wt %: sodium oxide 0.26-0.8, calcium oxide 0.8-4.2, rare-earth element oxide 12.1-20.0, platinum oxide and/or palladium oxide and/or rhenium oxide and/or rhodium oxide 0.02-2.0, and/or chlorine 0.05-0.8 and/or chlorine 0.005-0.5, a zeolite with ratio SiO₂/Al₂O₃ equal to 2.8-7.0 being the balance. Disclosed also are two versions of the method of producing a zeolite-based catalyst for alkylation of isobutane with C₂-C₄ olefins, involving treatment thereof with aqueous solutions of salts of calcium, a rare-earth element and ammonium at high temperature and pressure of saturated vapour for a period of time necessary to convert the zeolite into a rare-earth calcium zeolite, and depositing active metal oxides onto it by saturation with aqueous solutions containing active metals, followed by washing, drying and calcination, where at the beginning, the obtained rare-earth calcium zeolite is saturated with unipolar water until the release of air from zeolite pores stops, and then depositing active metal oxides: platinum oxide and/or palladium oxide and/or rhenium oxide and/or rhodium oxide and/or halogen - chlorine or fluorine, taken in amounts which ensure said content of the oxide of the corresponding metal and halogen in the ready product, or deposition of active metal oxides - platinum oxide and/or palladium oxide and/or rhenium oxide and/or rhodium oxide and/or halogen - chlorine or fluorine - onto the rare-earth calcium zeolite is carried out from solutions containing the corresponding metals or halogen in unipolar water, taken in amounts which ensure said content of oxide of the oxide of the corresponding metal in the ready catalyst, wherein in both versions, deposition of active metals and halogen is carried out in two steps: at the first step via cold saturation at temperature not higher than 30°C for 1 hour, at the second step - at temperature not lower than 70°C for 1 hour, after which treatment with an organic acid is carried out in the presence of 30% aqueous hydrogen peroxide solution, followed by drying, tableting and calcination. Described is a method for liquid-phase alkylation of isobutane with olefins in the presence of the catalyst described above.;EFFECT: longer stable operation of the catalyst with activity thereof up to almost 100 wt % and isooctane selectivity of up to 75,7 wt %.;20 cl, 10 ex, 2 tbl