Composite oxide and silicon trapping agent, methods for their production and their application, and a method for processing silicon-containing petroleum product

Claims

1. A composite oxide characterized in that it includes aluminum oxide and pseudoboehmite, wherein the pseudoboehmite is applied to the outer surface of the aluminum oxide, and the content of surface hydroxyl groups in the composite oxide is from 1000 to 2500 μmol / g.

2. The composite oxide according to claim 1, wherein the content of surface hydroxyl groups in the composite oxide is from 1500 to 2000 μmol / g; preferably the element aluminum constitutes from 47.3 to 52.8%, more preferably from 48.5 to 52% of the total weight of the composite oxide; preferably, the X-ray diffraction pattern of the composite oxide contains diffraction peaks at 14.5°±0.05°, 28.2°±0.05°, 49.2°±0.05°; and / or the pseudoboehmite content is from 1 to 50%, preferably from 1 to 40%, more preferably from 2 to 30% of the total weight of the composite oxide; and / or the specific surface area of ​​the composite oxide is from 300 to 450 m 2 / G; and / or the particle size of the composite oxide is from 0.5 to 5 mm, preferably from 1 to 3.5 mm.

3. A silicon trapping agent characterized in that it comprises aluminum oxide, pseudoboehmite and an active component comprising a group VIB metal sulfide and a group VIII metal sulfide; The content of surface hydroxyl groups in the silicon trapping agent is from 1000 to 2000 μmol / g.

4. The silicon trapping agent according to claim 3, wherein the content of surface hydroxyl groups in the silicon trapping agent is from 1200 to 1800 μmol / g; Preferably, the content of the aluminum element is from 34.8 to 51%, more preferably from 39.1 to 48.6% of the total weight of the silicon trapping agent.

5. The silicon trapping agent according to claim 3 or 4, wherein the X-ray diffraction pattern of the silicon trapping agent comprises diffraction peaks at 4.5°±0.05°, 28.2°±0.05°, 49.2°±0.05°; Preferably, the specific surface area of ​​the silicon trapping agent is from 250 to 420 m 2 / G; preferably, the group VIB metal sulfide and the group VIII metal sulfide are supported on an aluminum oxide support, and the pseudoboehmite is supported on the group VIB metal sulfide, the group VIII metal sulfide and the aluminum oxide support.

6. The silicon trapping agent according to any one of claims 3 to 5, wherein the pseudoboehmite content is from 3 to 20%, preferably from 5 to 15% of the total weight of the silicon trapping agent; and / or the content of the metal of group VIB, calculated as sulfide, is from 2 to 20%, preferably from 5 to 15%, and the content of the metal of group VIII, calculated as sulfide, is from 1 to 10%, preferably from 2 to 8% of the total weight of the silicon-capturing agent; and / or the sulfide of a metal of group VIB is molybdenum sulfide and / or tungsten sulfide, and the sulfide of a metal of group VIII is nickel sulfide and / or cobalt sulfide; and / or the aluminum oxide content is from 50 to 96%, preferably from 62 to 88% of the total weight of the silicon trapping agent.

7. A method for producing a silicon trapping agent comprising the following steps: (1) introducing a VLB group metal compound and a VIII group metal compound into an aluminum oxide carrier by an impregnation method and then performing calcination and sulfonation to obtain a silicon trapping agent precursor; (2) carrying out a precipitation reaction with an aluminum source and a precipitating agent in the presence of a silicon trapping agent precursor, and then carrying out aging and drying.

8. The method according to claim 7, wherein the silicon-catching agent precursor, the aluminum source and the precipitating agent are added in such quantities that the pseudoboehmite content in the resulting silicon-catching agent is from 3 to 20%, preferably from 5 to 15% of the total weight of the silicon-catching agent; Preferably, the alumina support, the compound of a metal of group VIB, the compound of a metal of group VIII, the aluminum source and the precipitating agent are added in such quantities that in the resulting silicon-catching agent the content of the metal of group VIB, calculated as sulfide, is from 2 to 20%, preferably from 5 to 15%, the content of the metal of group VIII, calculated as sulfide, is from 1 to 10%, preferably from 2 to 8%, and the content of aluminum oxide is from 50 to 96%, preferably from 62 to 88% of the total weight of the silicon-catching agent.

9. The method according to claim 7 or 8, wherein the compound of a metal of group VIB is a phosphate and / or ammonium salt of a metal of group VIB; and / or the compound of a metal of group VIII is at least one compound selected from the group consisting of nitrates, carbonates, phosphates, sulfates, basic carbonates and acetates of a metal of group VIII; Preferably, the firing conditions in step (1) include a firing temperature of 300 to 600°C and a firing duration of 3 to 6 hours.

10. The method according to any one of paragraphs 7-9, in which the sulfonation in step (1) is carried out by a dry sulfonation method or a wet sulfonation method; preferably, the sulfonating agent used in the dry sulfonation method is hydrogen sulfide, and the sulfonating agent used in the wet sulfonation method is at least one compound selected from the group consisting of carbon disulfide, dimethyl disulfide, methyl sulfide and n-butyl sulfide; preferably, the sulfonation conditions in step (1) include a sulfonation pressure of 3.2 to 6.4 MPa, a sulfonation temperature of 250 to 400°C, a sulfonation duration of 4 to 12 hours, and a hydrogen gas flow rate of 2 to 25 ml⋅min- -1 ⋅g -1 .

11. The method according to any one of claims 7 to 10, wherein the aluminum source is an acidic aluminum salt or an alkaline aluminum salt; preferably, the acidic aluminum salt is at least one compound selected from the group consisting of Al2(SO4)3, AlCl3, and Al(NO3)3, and / or the alkaline aluminum salt is NaAlO2; preferably the aluminum source is an acidic aluminum salt and the precipitating agent is at least one compound selected from the group consisting of NaOH, NH4OH and NaAlO2, and / or the aluminum source is an alkaline aluminum salt and the precipitating agent is CO2; preferably, the precipitation reaction conditions include a pH of 7.5 to 11, a temperature of 50 to 95°C, and a duration of 30 to 120 minutes; Preferably, the holding conditions include a pH of 7.5 to 11, a temperature of 50 to 90°C, and a duration of 3 to 24 hours; Preferably, the precipitation reaction and the holding process in step (2) are carried out in an inert atmosphere.