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Low-cost method for preparing high-crystallinity high-viscosity pseudo-boehmite

A technology of pseudo-boehmite and high crystallinity, which is applied in the field of low-cost preparation of pseudo-boehmite with high crystallinity and high adhesiveness, and can solve the problem of low crystallinity of pseudo-boehmite and pseudo-boehmite High cost, long time for acid thixotropy, etc., to achieve high adhesiveness, low cost, and high crystallinity

Inactive Publication Date: 2019-09-20
广西玉林市思达粉体技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems. One is that high-purity aluminum ingots are used to react, and the cost of the prepared pseudo-boehmite is high, and the preparation cost basically reaches the market price, so it is difficult to promote; the other is that the crystallinity of the produced pseudo-boehmite is low. , the acid thixotropy time is long, the gelation index is low, and some even contain tri-aluminum miscellaneous items, the quality is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low-cost method for preparing pseudo-boehmite with high crystallinity and high adhesiveness, the operation steps are as follows:

[0022] (1) 3N waste electronic aluminum foil is made into aluminum flakes with a size of 1-5mm, cleaned with deionized ultrasonic water to remove stains, and dried completely, and then 150g of dried aluminum flakes and 1000g of isopropanol are placed in a 5L reactor. Under the catalysis of mercuric chloride, react at 88°C for 6 hours to obtain aluminum isopropoxide. The obtained aluminum isopropoxide is transferred to a 3L container, and distilled and purified at 180°C for 10 hours. The waste residue is filtered to obtain purified isopropanol. The aluminum alkoxide is transferred to the alkoxide hydrolysis reactor, and the alcohol solution is added to the aluminum alkoxide of isopropoxide and mixed according to the aluminum isopropoxide: alcohol solution=1:15-20 molar ratio (the alcohol solution is deionized water The molar ratio with isoprop...

Embodiment 2

[0025] A low-cost method for preparing pseudo-boehmite with high crystallinity and high adhesiveness, the operation steps are as follows:

[0026] (1) 4N industrial waste aluminum scraps are made into aluminum blocks with a size of 1-5mm, and they are ultrasonically cleaned with deionized water to remove stains, and they are completely dried. Then, 150g of dried aluminum blocks and 1000g of n-butanol are put into 5L In the reactor, react under the catalysis of aluminum chloride at 90°C for 6 hours to obtain aluminum n-butoxide. The obtained aluminum alkoxide is transferred to a 3L container, and distilled and purified at 160°C for 8 hours. The waste residue is filtered to remove the purified product. The n-butoxide aluminum alkoxide is transferred to the alkoxide hydrolysis reactor, and the alcohol solution is added to the n-butoxide aluminum alkoxide according to the molar ratio of n-butoxide aluminum alkoxide: alcohol solution = 1:55 (the alcohol solution is to remove The molar...

Embodiment 3

[0029] A low-cost method for preparing pseudo-boehmite with high crystallinity and high adhesiveness, the operation steps are as follows:

[0030] (1) 2N scrap aluminum electronic aluminum foil is made into aluminum particles with a size of 1-5mm, and cleaned with deionized ultrasonic water to remove stains, completely dried, and then 150g of dried aluminum flakes and 1000g of isoamyl alcohol are put into a 5L reactor , Under the catalysis of mercuric chloride, react at 80°C for 10h to obtain aluminum isoamyl alcoholate. The obtained aluminum isoamyl alcoholate is transferred to a 3L container, distilled and purified at 200°C for 1 hour, and the waste residue is filtered to obtain purified isoamyl The aluminum alkoxide is transferred to the modified alkoxide hydrolysis reaction kettle, and the alcohol solution is added to the aluminum isoamyl alcoholate and mixed with the aluminum isoamyl alcoholate: alcohol solution = 1:15-20 molar ratio (alcohol solution (The molar ratio of dei...

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PUM

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Abstract

The invention discloses a low-cost method for preparing high-crystallinity high-viscosity pseudo-boehmite. The method comprises the following steps: (1) carrying out a reaction on an industrial waste aluminum raw material of 2N-4N with an alcohol under the catalytic action of mercuric chloride or aluminum chloride to obtain an aluminum alkoxide, carrying out distilling purification on the obtained aluminum alkoxide for 6-24 hours, mixing the purified aluminum alkoxide with an alcohol solution, and carrying out hydrolyzing to obtain a completely hydrolyzed pseudo-boehmite wet product; and (2) adding water, carrying out washing at a temperature of 50-60 DEG C, continuously carrying out stirring, adding an auxiliary agent, and carrying out aging to obtain the high-crystallinity high-viscosity pseudo-boehmite. According to the method, waste aluminum products with relatively low purity are adopted, so that preparation cost is low, energy is saved, and the environment is protected. The purity of the produced pseudo-boehmite is in a range of 99.9-99.95% and meets the requirements of the catalytic industry on pseudo-boehmite. Meanwhile, 90-95% of the alcohol can be recovered in the process, so that cost is greatly reduced.

Description

Technical field [0001] The invention relates to a method for preparing pseudo-boehmite, in particular to a method for preparing pseudo-boehmite with high crystallinity and high adhesiveness at low cost. Background technique [0002] Pseudo-boehmite, also known as alumina monohydrate, is an important raw material for catalysts and is widely used in petrochemical fields such as catalytic cracking, hydrogenation, and reforming. In addition to being an important catalyst carrier, pseudo-boehmite is also the main adhesive for making many other catalysts, and has an important role to play. [0003] The large pore volume of pseudo-boehmite can be used directly as a catalyst carrier, and the small pore volume can be used as an adhesive for the catalyst carrier. The pseudo-boehmite produced by the aluminum alkoxide method represented by Sasol in Germany has peptization The index can reach 99%, the sol-gel process is fast and the thixotropy is good, so the market for adhesives in the field ...

Claims

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Application Information

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IPC IPC(8): C01F7/02B09B3/00
CPCB09B3/00C01F7/02C01P2006/12C01P2006/80
Inventor 王程民梁清延高宏
Owner 广西玉林市思达粉体技术有限公司
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