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Preparation method of rodlike high-purity pseudo-boehmite

A pseudo-boehmite, high-purity technology, applied in the field of preparation of rod-shaped high-purity pseudo-boehmite, can solve the problems of difficult control of product pore structure, wide pore size distribution, unstable quality, etc., and achieve the best industrial production value And economic benefits, low production costs, fast and efficient mixing effects

Active Publication Date: 2021-03-19
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pseudoboehmite is produced by double aluminum method and carbonization method. The synthesis steps mainly include gelation, aging, washing and drying. The process is simple and the cost is low, but the product has high content of impurity elements such as Na, S and Si. , high water consumption for washing, wide pore size distribution and unstable products; the production of pseudo-boehmite by the aluminum alcohol method has the characteristics of environmental protection and low water consumption. The product has the advantages of high purity and good peptization, and is widely used in In the field of reforming catalysts, dehydrogenation catalysts and hydrogenation catalysts, there are problems that the product pore structure is not easy to control, the quality is unstable, and the pore size distribution and particle size distribution are not concentrated

Method used

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  • Preparation method of rodlike high-purity pseudo-boehmite
  • Preparation method of rodlike high-purity pseudo-boehmite
  • Preparation method of rodlike high-purity pseudo-boehmite

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Effect test

Embodiment 1

[0023] 1) Dissolve aluminum isopropoxide with a purity of 4N in anhydrous isopropanol at 70°C to form a transparent solution with a mass fraction of aluminum isopropoxide of 50%, keep the liquid temperature at 70°C, and follow the flow rate of 2ml / min The flow rate is passed into the inlet of the T-shaped microreactor, and the inner diameter of the T-shaped microreactor is 0.6mm;

[0024] 2) Mix high-purity water and isopropanol to prepare a solution with a mass fraction of isopropanol of 20%, then add lactic acid whose mass is 10% of isopropanol to make another solution, keep the liquid temperature at 30°C, and follow the flow rate The flow rate of 16ml / min enters another inlet of the T-shaped reactor;

[0025] 3) Collect the slurry at the outlet of the T-shaped reactor and age at 90°C for 2 hours;

[0026] 4) The aged slurry was filtered, beaten and spray-dried to obtain rod-shaped high-purity pseudo-boehmite powder, whose physical and chemical properties are shown in Table...

Embodiment 2

[0028] 1) Dissolve aluminum isopropoxide with a purity of 4N in anhydrous isopropanol at 60°C to form a transparent solution with a mass fraction of aluminum isopropoxide of 40%, keep the liquid temperature at 60°C, and follow the flow rate of 4ml / min The flow rate is passed into the inlet of the T-shaped microreactor, and the inner diameter of the T-shaped microreactor is 1.5mm;

[0029] 2) Mix high-purity water and isopropanol to prepare a solution with a mass fraction of isopropanol of 30%, and then add a mixture of malic acid and citric acid whose mass is 15% of isopropanol to form another solution to keep the liquid The temperature is at 20°C, and it enters the other inlet of the T-shaped reactor according to the flow rate of 20ml / min;

[0030] 3) Collect the slurry at the outlet of the T-shaped reactor and age at 90°C for 2 hours;

[0031] 4) The aged slurry was filtered, beaten and spray-dried to obtain rod-shaped high-purity pseudo-boehmite powder, whose physical and ...

Embodiment 3

[0033] 1) Dissolve aluminum isopropoxide with a purity of 4N in anhydrous isopropanol at 80°C to form a transparent solution with a mass fraction of aluminum isopropoxide of 40%, keep the liquid temperature at 70°C, and follow the flow rate of 3ml / min The flow rate is passed into the inlet of the T-shaped reactor, and the inner diameter of the T-shaped microreactor is 1.0mm;

[0034] 2) Mix high-purity water and isopropanol to prepare a solution with a mass fraction of isopropanol of 20%, then add tartaric acid whose mass is 15% of isopropanol to form another solution, keep the liquid temperature at 40°C, and follow the flow rate The flow rate of 15ml / min enters another inlet of the T-shaped reactor;

[0035] 3) Collect the slurry at the outlet of the T-shaped reactor and age at 90°C for 2 hours;

[0036] 4) The aged slurry was filtered, beaten and spray-dried to obtain rod-shaped high-purity pseudo-boehmite powder, whose physical and chemical properties are shown in Table 1,...

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Abstract

The invention discloses a preparation method of rodlike high-purity pseudo-boehmite. The method comprises the following steps of: dissolving aluminum isopropoxide with purity of 99.99% in isopropanolto prepare a solution; mixing high-purity water, isopropanol and organic acid to prepare another solution; introducing the two solutions into inlets of two channels of a T-shaped micro-reactor by a constant-flux pump, and aging slurry obtained at an outlet of the reactor at 80-90DEG C for 2h; filtering, pulping and spray-drying the aged slurry to obtain high-purity pseudo-boehmite powder with a rodlike morphology, and recycling isopropanol at the same time. The high-purity pseudo-boehmite obtained by the method has the characteristics of controllable pore structure, centralized pore size distribution, narrow particle size distribution and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a preparation method of rod-shaped high-purity pseudo-boehmite. Background technique [0002] Pseudo-boehmite is a kind of aluminum hydroxide with incomplete crystallization and thin wrinkled sheets. It has the characteristics of good peptization, strong adhesion, specific surface area, and large pore volume. It is mainly used as a catalyst carrier. Raw materials for production, such as hydrocracking catalysts, reforming catalysts, alkane dehydrogenation catalysts and automobile exhaust purification catalysts in the petrochemical field. [0003] The production methods of pseudo-boehmite mainly include double aluminum method, carbonization method and aluminum alcohol method. Pseudoboehmite is produced by double aluminum method and carbonization method. The synthesis steps mainly include gelation, aging, washing and drying. The process is simple and the cos...

Claims

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Application Information

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IPC IPC(8): C01F7/30B82Y30/00B82Y40/00
CPCC01F7/30B82Y30/00B82Y40/00C01P2006/12C01P2006/14C01P2006/17C01P2004/64C01P2004/61C01P2004/03C01P2004/30
Inventor 夏继平李晓云孙彦民于海斌蔡哲杨玉旺李世鹏吴同旭孟广莹
Owner CNOOC TIANJIN CHEM RES & DESIGN INST