Preparation method for pseudo-boehmite and alumina

A technique of pseudo-boehmite and alumina, applied in the field of preparation of pseudo-boehmite and alumina, can solve the problems of uneven pore size, low crystal phase purity, unstable products, etc., and achieves short reaction time, alcohol and other problems. The effect of high purity and single crystal phase of aluminum

Active Publication Date: 2017-07-14
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods of domestic production of pseudo-boehmite and alumina are mainly carbonization and precipitation methods. The products produced by the existing pseudo-boehmite production process have high impurities, and may have uneven pore diameters, low crystal phase purity, and products. unstable

Method used

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  • Preparation method for pseudo-boehmite and alumina
  • Preparation method for pseudo-boehmite and alumina

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Put 108g aluminum ingots and 200g higher fatty alcohol into a 5L kettle with a condenser, heat it to 110°C, and after producing obvious bubbles, add 1136g higher fatty alcohol dropwise. After the reaction, add 400g trimethylbenzene to the flask and heat to At 110°C, filter to obtain a mixture of aluminum alkoxide and trimethylbenzene. Add 126 mL of deionized water to the kettle and raise the temperature to 80°C. A mixture of aluminum alkoxide and trimethylbenzene at a temperature of 80°C was added dropwise to the kettle while stirring was started, and the addition was completed in 30 minutes. The mixture of fatty alcohol and trimethylbenzene produced by the hydrolysis of aluminum alkoxide is drawn out from the flask. Add 90 mL of deionized water to the kettle and increase the temperature to 85°C, after aging for 12 hours. The remaining alcohol and solvent are evaporated, and spray dried to obtain 240 g of pseudo-boehmite. After XRD, differential thermal and ICP-MS ana...

Embodiment 2

[0026] Put 108g aluminum flakes and 200g higher fatty alcohol into a 5L kettle with a condenser, heat it to 110°C and generate obvious bubbles, add 1136g higher fatty alcohol dropwise, add 400g trimethylbenzene to the flask after the reaction, and heat to At 110°C, filter to obtain a mixture of aluminum alkoxide and trimethylbenzene. Add 126 mL of deionized water to the kettle and raise the temperature to 80°C. A mixture of aluminum alkoxide and trimethylbenzene at a temperature of 80°C was added dropwise to the kettle while stirring was started, and the addition was completed in 30 minutes. The mixture of fatty alcohol and trimethylbenzene produced by the hydrolysis of aluminum alkoxide is drawn out from the flask. Add 180 mL of deionized water to the kettle and raise the temperature to 85°C, after aging for 12 hours. The remaining alcohol and solvent are distilled off, and spray-dried to obtain 240 g of pseudo-boehmite. After XRD, differential thermal and ICP-MS analysis, ...

Embodiment 3

[0028] Put 108g aluminum wire, 200g higher fatty alcohol into a 5L kettle with condenser, heat it to 110°C, and after producing obvious bubbles, add 1136g higher fatty alcohol dropwise, add 400g trimethylbenzene to the flask after the reaction, and heat to At 110°C, filter to obtain a mixture of aluminum alkoxide and trimethylbenzene. Add 126 mL of deionized water to the kettle and raise the temperature to 85°C. A mixture of aluminum alkoxide and trimethylbenzene at a temperature of 85°C was added dropwise to the kettle while stirring was started, and the addition was completed in 30 minutes. The mixture of fatty alcohol and trimethylbenzene produced by the hydrolysis of aluminum alkoxide is drawn out from the flask. Add 450 mL of deionized water to the kettle and raise the temperature to 90°C and age it for 10 hours. The remaining alcohol and solvent are distilled off, and spray-dried to obtain 240 g of pseudo-boehmite. After XRD, differential thermal and ICP-MS analysis, i...

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Abstract

The invention provides a method for preparing pseudo-boehmite and alumina from higher fatty alcohol. The method comprises the following preparation steps: (1) preparing aluminum alkoxide; (2) carrying out filtering; (3) carrying out a hydrolysis reaction; (4) separating alcohol; (5) carrying out aging and distilling the alcohol; (6) carrying out spray drying so as to obtain high-purity pseudo-boehmite; and (7) carrying out calcining and crushing so as to obtain alumina. The method provided by the invention overcomes the disadvantages of difficult purification, uneasy recycling and utilization of lower alcohol and safety problem in preparation of aluminum alkoxide from the lower alcohol. The preparation process is environment-friendly and does not discharge three wastes; recovered alcohol and solvents can be recycled after treated; and obtained products can be extensively applied to carriers of catalytic reforming and catalytic hydrogenation.

Description

Technical field [0001] The invention belongs to the field of catalyst materials, and is specifically a preparation method of pseudo-boehmite and alumina. Background technique [0002] High-purity pseudo-boehmite and alumina are important materials for catalyst carriers, integrated circuit substrates, transparent phosphors, functional single crystals, precision instruments and aviation functional devices. Pseudo-boehmite is an important intermediate for the synthesis of various activated aluminas, and its performance has an important influence on the performance of alumina. The research and development of high-purity pseudo-thin water preparation methods have been carried out for many years, and industrial-scale production has been carried out abroad. Condea, Germany, uses metal aluminum powder and n-hexanol to produce high-purity SB powder (such as US4590289). It has built industrial equipment with a capacity of 10,000 tons per year. The products are sold well all over the world...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/42C01F7/44B01J21/04B01J32/00
CPCB01J21/04C01F7/42C01F7/441C01P2002/72
Inventor 辛秀兰于洋侯松松黄树楷徐宝财
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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