Start-up method and application of hydrocracking catalyst
A technology of hydrocracking and catalyst, which is applied in the field of catalyst and hydrocracking catalyst start-up, and can solve the problem that the initial activity of the catalyst has not been solved, etc.
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Embodiment 1
[0063] The catalyst composition and hydrogen reduction procedure were the same as those of Comparative Example 1.
[0064] Slowly reduce the temperature of the catalyst bed to 310°C, keep the maximum hydrogen circulation allowed by the device, and the pressure is 5.0MPa; take toluene with a purity greater than 99% as the starting oil, and take 0.5h as the starting oil. -1 The space velocity conditions were put into operation, and the volume ratio of hydrogen to oil was 1500; after 30 minutes, oil was seen at the reactor outlet, and the temperature at the reactor outlet reached a maximum of 346 °C and then slowly decreased, and the adsorption heat was slowly released. After the reactor outlet temperature dropped below 320 °C, the toluene feed space velocity was gradually increased to 2.0 h -1, and then the inlet temperature of the reactor was increased to 340 °C, and it was operated stably for 72 hours. During this period, the initial activity of the catalyst gradually decayed...
Embodiment 2
[0066] An appropriate amount of hydrogen-type mordenite (SAR=25) with a pore space index of 7.2 is fully mixed with pseudo-boehmite, kneaded, extruded, dried at 120 °C, and then calcined in an air atmosphere of 550 °C for 4 hours to obtain the desired catalyst carrier. A bimetallic solution was prepared with tetraammine platinum chloride and ammonium molybdate, the catalyst carrier was impregnated by an equal volume impregnation method, dried at 120°C, and then calcined in an air atmosphere of 500°C for 2 hours. In parts by weight, the obtained catalyst composition is 0.12 parts of PtO 2 -11.70MoO 3 / 53.65 parts mordenite - 34.53 parts Al 2 O 3 .
[0067] The catalyst was loaded into a fixed-bed reactor, the reactor and the circulation system were replaced with nitrogen until the oxygen content was less than 0.1%, and then replaced with PSA (pressure swing adsorption unit) hydrogen with a hydrogen purity of 99% and the pressure was increased to 3.0 MPa. The inlet temperat...
Embodiment 3
[0070] The right amount of beta zeolite with a space index of 17.1, a dry basis content of 70% pseudoboehmite and amorphous silica-alumina (SiO 2 Content 6wt%, dry basis content 80%) through kneading, extrusion molding. It was incubated at room temperature for 24 hours, dried at 90°C for 12 hours, and calcined at 580°C for 3 hours in an air atmosphere to obtain a hydrocracking catalyst carrier. Appropriate amounts of nickel nitrate and ammonium tungstate were prepared into a clear solution, which was immersed in an equal volume, dried at 100°C, and calcined in air at 560°C for 2.5 hours. In parts by weight, the composition of the obtained catalyst precursor is 4.6 parts of NiO-3.0 parts of WO 3 / 34.2 parts β-57.3 parts Al 2 O 3 -0.9 parts SiO 2 .
[0071] The catalyst was loaded into a fixed-bed reactor, the reactor and the circulation system were replaced with nitrogen until the oxygen content was less than 0.1%, and then replaced with PSA (pressure swing adsorption unit...
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