Release Time:2023-05-13  Hits:

Date of Publication: 2022-10-10

Journal: 石油学报 石油加工

Institution: 化工学院

Issue: 5

Page Number: 677-683

ISSN: 1001-8719

Abstract: TS-1 samples were modified with dilute tetrapropyl ammonium hydroxide (TPAOH) aqueous solution. The effects of modification conditions on the catalytic properties of extruded TS-1 samples in propylene epoxidation were investigated. The reaction conditions, such as reaction temperature, space velocity of propylene, concentration of H2O2, concentration of ammonia, length/diameter radio (L/D) of the catalyst bed, particle size of the extruded catalyst, were optimized. The results showed that the suitable reaction conditions were as follows: reaction temperature of 45°C, reaction pressure of 3.0 MPa, total space velocity of 3.5 h-1, propylene space velocity of 0.6 h-1, by using the mixture of acetone and methanol with a mole ratio of 3 as solvent, H2O2 concentration of 1.1 mol/L, ammonia concentration of 0.4 mmol/L, particle size of the catalyst 1 mm×1 mm and L/D of the catalyst bed of 11, under which the conversion of H2O2 and the selectivity of propylene oxide reached above 95% and kept stable. A long term of 1500 h reaction showed that the extruded TS-1 catalyst modified with TPAOH exhibited high activity, selectivity of propylene oxide and stability in epoxidation of propylene.

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