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Preparation method of macroporous alumina support

A macroporous alumina, alumina technology, applied in catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as low specific surface area, and achieve high specific surface area, long-lasting pore-forming effect, and low cost. Effect

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Larger pores are required for diffusion in order to inhibit the deposition of sediment on the orifice, but larger pores usually mean lower specific surface area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Pretreatment of sawdust. 10 grams of 100-150 mesh sawdust, dried at 100°C for 10 hours. Move the dried sawdust into the carbonization furnace for carbonization treatment. The carbonization conditions are as follows: heating rate 10°C / hour, carbonization temperature 850°C, carbonization time 0.5 hours, nitrogen gas is always flowed into the carbonization furnace during the carbonization process, and naturally cooled to room temperature after carbonization .

[0033] Impregnation of inorganic aluminum salt solutions. The above carbonized sawdust was immersed in the aluminum nitrate solution with a concentration of 5wt% until the adsorption equilibrium was reached, then the excess liquid was filtered off, naturally dried in the shade at room temperature, and then dried at 60°C for 10 hours. After drying, the above adsorption and drying process was repeated 3 times. The resulting carbonized sawdust after treatment is denoted as F1, and its specific surface area is 274 m ...

Embodiment 2

[0039] 130 grams of pseudo-boehmite dry rubber powder, 15 grams of carbonized sawdust F1, and 5 grams of scallop powder. After mixing evenly in a dry state, gradually add 145ml of dilute nitric acid with a concentration of 3.5wt%. After stirring, transfer it into extruded strips in batches It is kneaded in the machine to form a plastic body, and then extruded into strips. After drying overnight at room temperature, the extrudate was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 550°C at a rate of 10°C / hour, kept at this temperature for 8 hours, and cooled naturally to obtain a macroporous alumina carrier.

Embodiment 3

[0041] 130 grams of pseudo-boehmite dry rubber powder, 15 grams of carbonized sawdust F2, and 5 grams of scallop powder. After mixing evenly in a dry state, gradually add 145ml of dilute nitric acid with a concentration of 3.5wt%. After stirring, transfer it into extruded strips in batches It is kneaded in the machine to form a plastic body, and then extruded into strips. After drying overnight at room temperature, the extrudate was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 650°C at a rate of 10°C / hour, kept at this temperature for 6 hours, and cooled naturally to obtain a macroporous alumina carrier.

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Abstract

The invention discloses a preparation method of a macroporous alumina support. The method is characterized by taking sawdust produced in the wood processing industry as a pore-enlarging agent, enabling the sawdust to adsorb an inorganic aluminium salt solution after carbonizing treatment, and kneading, forming, drying and roasting the sawdust and an alumina precursor after drying the sawdust, thus obtaining the macroporous alumina support. The alumina support obtained by the method is larger in specific surface area, more concentrated in pore size distribution and high in mechanical strength, also contains part of macropores with sizes more than 100nm, is suitable for preparing heavy / residual oil hydrogenation catalysts, and is favorable for removing macromolecular impurities in heavy / residual oil and delaying the increase of diffusion resistance in heavy / residual oil hydrogenation, thus being favorable for maintaining the activities of the hydrogenation catalysts and lengthening the running period.

Description

technical field [0001] The invention relates to a method for preparing a macroporous alumina carrier, in particular to a method for preparing a macroporous alumina carrier used as a catalyst for hydrogenation demetallization of heavy oil and residual oil. Background technique [0002] As crude oil becomes increasingly heavy and inferior, oil refineries are faced with a large number of problems in the processing and utilization of heavy and residual oil. There are a large amount of organometallic compounds such as nickel, vanadium and iron and asphaltenes in heavy and residual oils. The above metals and asphaltenes will cause the blockage of the pores of the catalyst bed and reduce the life of the catalyst. Extensive metal deposits on the catalyst tend to poison or deactivate the catalyst. In addition, asphaltenes tend to reduce the sensitivity of hydrocarbon desulfurization, and for hydrodesulfurization catalysts, if acted on hydrocarbon feeds containing metals and asphalte...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/10
Inventor 杨卫亚沈智奇凌凤香王少军王丽华季洪海郭长友
Owner CHINA PETROLEUM & CHEM CORP
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