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Preparation method of composite carrier

A composite carrier and precursor technology, applied in catalyst carrier, chemical instrument and method, catalyst activation/preparation, etc., can solve the problems of carrier pore structure damage and difficult effective combination, so as to improve carrier strength and avoid inhomogeneity , Easy peptization effect

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also does not avoid the addition of acid during the molding process, which will still lead to partial destruction of the carrier pore structure
At the same time, this method uses organic substances containing hydroxyl or carboxyl groups to enhance the binding ability of alumina and molecular sieves. There is no chemical reaction between alumina and molecular sieves, so it is difficult to effectively combine them. During the drying and roasting process, with the decomposition of organic substances, the product catalyst The alumina and molecular sieve components will agglomerate

Method used

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  • Preparation method of composite carrier
  • Preparation method of composite carrier
  • Preparation method of composite carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Put 1 L of aluminum sulfate solution (concentration of 0.2 mol / L) and 1 L of sodium metaaluminate solution (concentration of 0.3 mol / L) in the raw material tank respectively, and place 1 L of pure water in the reaction tank as the bottom liquid, pass The temperature of the reaction tank is controlled to 60° C. by water circulation, and a small amount of sodium hydroxide is added to make the pH value of the solution 8.5. Inject the aluminum sulfate solution into the reaction tank at a rate of 10 mL / min, and at the same time inject the sodium metaaluminate solution and adjust the rate so that the pH value of the reaction tank solution is constant at 8.8. After 60 min, the neutralization is completed, and the Na is fully washed to remove + ions and SO 4 2- After ionization, a certain amount of deionized water was added to obtain pseudo-boehmite slurry A with a solid-to-liquid ratio of 8% (calculated as alumina).

Embodiment 2

[0031] 50g ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 30.0, the unit cell constant is 20 Å, and the relative crystallinity is 85%), and put it into the 625g pseudoboehmite slurry A obtained in Example 1, stir well and then add 200g ethanol, continue stirring evenly, then add 50g of tetraethoxysilane, after continuous stirring, a small amount of tetramethylammonium hydroxide was added to adjust the pH value of the slurry to 8.5. Put it in a closed autoclave, age at 185°C for 24 hours, take it out and filter until the water content of the filter cake is 39%, add 8g of ethylenediamine and 6g of tetraethoxysilane and knead it into a plastic body, then extrude into a strip, and dry at 100°C After 3 hours, it was calcined at 500° C. for 4 hours to obtain the final composite carrier S-1.

Embodiment 3

[0033] 10g SBA-15 mesoporous molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 35.0) into the 625g pseudo-boehmite slurry A obtained in Example 1, and then add 500g isopropanol after stirring evenly, and then add 75g dimethylvinylethoxysilane after continuing to stir evenly, After continuing to stir evenly, add a small amount of triethanolamine to adjust the pH value of the slurry to 9.0. Put it in a closed autoclave, age at 160°C for 20 hours, take it out and filter until the water content of the filter cake is 52%, add 3.5g of diethylamine and 4g of dimethylethoxysilane and knead it into a plastic body, and then extrude it into a strip. After drying at 100°C for 3 hours, it was calcined at 500°C for 4 hours to obtain the final composite carrier S-2.

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Abstract

The invention discloses a preparation method of a composite carrier. The preparation method of the composite carrier comprises the following steps: (1) uniformly mixing pseudo-boehmite precursor slurry, a molecular sieve and organic alcohol to obtain a slurry A; (2) adding a silane coupling agent into the slurry A obtained in the step (1), uniformly mixing, and then adjusting the pH value of the slurry to 7.5-11 to obtain a slurry B; and (3) aging the slurry B obtained in the step (2) under a certain pressure, filtering to remove a certain amount of water from the material after aging is finished, adding organic amine and a silane coupling agent, kneading to form a plastic body, molding, drying, and roasting to obtain the composite carrier. According to the method, a molecular sieve is introduced in the growth process of an aluminum oxide crystal nucleus, a silane coupling agent is added, and the aluminum oxide crystals and the molecular sieve are orderly combined through hydrolysis ofthe silane coupling agent, so that the agglomeration of the aluminum oxide and the molecular sieve is avoided, and the formation of the pore channels and the surface acid of the carrier is effectively controlled.

Description

technical field [0001] The invention relates to a method for preparing a composite carrier, in particular to a method for preparing a composite hydrogenation catalyst carrier. Background technique [0002] In today's petroleum refining process, catalysts play a very important role, and the physical and chemical properties of catalyst supports have a great influence on the activity of catalysts. Usually the carrier of the hydrotreating catalyst is porous acidic alumina, and there are literature patent reports to adopt porous low-acidity molecular sieve or composite alumina (CN103349995A, CN102631934A, CN105251527A, J.Catal.317 (2014) 303-317, J.Catal.317 (2010) 273-286) as a carrier to prepare a highly active hydrotreating catalyst. Compared with porous acidic alumina carrier catalyst, this catalyst has stronger hydrogen adsorption capacity, so its hydrogenation activity is higher and it is easy to 4,6- Hydrodesulfurization of dimethyldibenzothiophene (4, 6-DMDBT) which is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/03B01J29/70B01J35/10B01J37/03B01J32/00B01J29/48B01J29/78
CPCB01J29/40B01J29/0308B01J29/7007B01J37/031B01J37/0018B01J29/48B01J29/0341B01J29/7815B01J2219/18B01J35/615B01J35/635B01J35/633
Inventor 孙进郭蓉杨成敏段为宇姚运海
Owner CHINA PETROLEUM & CHEM CORP
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