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Preparation method of macroporous pseudo-boehmite

A pseudo-boehmite and macro-pore volume technology, which is applied in the field of macro-pore volume pseudo-boehmite preparation, can solve the problem of unsatisfactory product pore size distribution uniformity, low synthesis process stability, and relatively fluctuating product technical indicators. It can achieve the effect of finely controlling the properties of the pore structure, improving the self-assembly ability, and reducing the generation of abnormally large particles.

Inactive Publication Date: 2017-10-03
GUANGXI RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method improves the pore volume and pore diameter of pseudo-boehmite to a certain extent, the uniformity of the pore size distribution of the product is not ideal, and the stability of the synthesis process is not high, resulting in large fluctuations in product technical indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare aluminum sulfate solution with a concentration of 10 g / L (calculated according to the mass of alumina), add hexadecyltrimethylammonium bromide, the amount added is calculated according to the molar amount of alumina in the solution, and the molar ratio is: hexadecyl Trimethylammonium bromide: alumina = 1:20, marked as solution A; then prepare sodium metaaluminate solution with a concentration of 20 g / L (calculated according to the mass of alumina), marked as solution B.

[0024] Use a peristaltic pump to control the flow rate of the solution, keep the flow rate of solution A at 10 mL / min, and the flow rate of solution B at 20 mL / min, and flow them into a serpentine reaction tube (10m*φ6mm) at a temperature of 20°C for gelation reaction. The pH value is 8.0; the material after the gelation reaction enters the aging kettle for aging, the aging temperature is 50°C, the pH value is controlled at 8.0, and the time is 1 hour. After the aged material is filtered, washed...

Embodiment 2

[0026] Prepare aluminum sulfate solution with a concentration of 20 g / L (calculated according to the mass of alumina), add cetyltrimethylammonium chloride and polyacrylic acid (molecular weight 4000), and the amount added is calculated according to the molar amount of alumina in the solution The ratio is: cetyltrimethylammonium chloride: polyacrylic acid: alumina = 2:1:100, marked as solution A; then configure sodium metaaluminate solution, the concentration is 50g / L (calculated according to the mass of alumina ), labeled solution B.

[0027] Use a peristaltic pump to control the flow rate of the solution, keep the flow rate of solution A at 20 mL / min, and the flow rate of solution B at 50 mL / min. The pH value is 8.5; the material after the gelation reaction enters the aging kettle for aging, the aging temperature is 55°C, the pH value is controlled at 8.5, and the time is 1.5 hours. Diaspore.

Embodiment 3

[0029] Prepare aluminum sulfate solution with a concentration of 50 g / L (calculated according to the mass of alumina), add tetradecyltrimethylammonium bromide and polysodium methacrylate (molecular weight 5000), and add the amount according to the mole of alumina in the solution The calculated molar ratio is: tetradecyltrimethylammonium bromide: sodium polymethacrylate: aluminum oxide = 2:1:120, marked as solution A; then configure sodium metaaluminate solution, the concentration is 60 g / L (calculated according to the mass of alumina), marked as solution B.

[0030] Use a peristaltic pump to control the flow rate of the solution, keep the flow rate of solution A at 50 mL / min, and the flow rate of solution B at 60 mL / min, and flow them into a serpentine reaction tube (10m*φ6mm) at a temperature of 30°C for gelation reaction. The pH value is 9; the material after the gelation reaction enters the aging kettle for aging, the aging temperature is 60°C, the pH value is controlled a...

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PUM

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Abstract

The invention discloses a preparation method of macroporous pseudo-boehmite. The preparation method comprises adding a surfactant into an acidic aluminum salt solution and then carrying out gelation with a sodium metaaluminate solution. The surfactant comprises one or more of long chain alkyl quaternary ammonium salt CnH2n+1(CH3)3N<+>X<->, polycarboxylic acid and a polycarboxylate. In the presence of the surfactant, through a tubular reactor, the acidic aluminum salt solution and the sodium metaaluminate solution undergo a reaction in a parallel flow way to produce macroporous pseudo-boehmite. The preparation method has simple processes, reduces a cost and improves product quality stability.

Description

technical field [0001] The invention belongs to the technical field of preparing pseudo-boehmite, in particular to a method for preparing pseudo-boehmite with large pore volume. Background technique [0002] Due to the heavy cracking of raw materials, for heavy crude oil, coal tar, shale oil and tar sand oil and other hydrotreating catalysts, the activated alumina carrier used must have a large enough pore volume and a suitable pore structure. It shows good catalytic activity, and can effectively reduce coking and avoid heavy metal impurity deposition to cause activity decline or deactivation, thereby prolonging the service life. Due to its large pore volume and pore diameter, pseudo-boehmite with large pore volume, the activated alumina prepared from it is also large in pore volume and pore diameter, and has good pore structure, specific surface area and heat resistance stability. It is often used as The carrier is used in the preparation of the catalyst. [0003] There a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
CPCC01F7/14C01P2006/12C01P2006/14C01P2006/16
Inventor 黄世勇王秋萍黄青则黄媚
Owner GUANGXI RES INST OF CHEM IND CO LTD
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