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Preparation method of pseudo-boehmite easy to peptize

A pseudo-boehmite, peptizing technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. Solubility, less acid consumption for gel formation, and the effect of reducing equipment corrosion

Inactive Publication Date: 2021-03-09
QINGDAO HUICHENG PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome defects such as poor peptization effect of existing pseudo-boehmite and unstable product quality, the invention provides a preparation method of easily peptized pseudo-boehmite

Method used

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Effect test

Embodiment 1～9

[0029] A kind of preparation method of easy peptization pseudo-boehmite of the present invention, it comprises the following steps:

[0030] Step 1: Configure ammonium aluminum sulfate crystals into a solution with an alumina concentration of 20-90g / l and an ammonia concentration of 15-20%. 3+ Mix with molar ratio (7~15):1, control pH value 10~12 and mixing temperature 20~60℃ after mixing;

[0031] Step 2: After mixing, the materials enter the aging kettle, the aging time is 2-8 hours, and the aging temperature is 60-130°C;

[0032] Step 3: After aging, the slurry is filtered, the filter cake is washed with water several times, and the washed filter cake is dried at a drying temperature of 60-120°C;

[0033] Step 4: After drying, the filter cake is crushed and ground to obtain a pseudo-boehmite product.

[0034] The peptization index of the obtained easily peptized pseudoboehmite can reach 99%-100%, and the specific surface area is 470-510m 2 / g, when preparing catalytic cr...

Embodiment 1

[0036] Ammonium aluminum sulfate is configured into a solution with an alumina concentration of 40g / l, and 17% concentrated ammonia water and ammonium aluminum sulfate are based on the ammonium root and Al3+ The molar ratio is 7:1, and it flows into the mixer in parallel. After the mixing, the pH value of the slurry is controlled to be greater than 10.5. The material enters the aging kettle, the aging time is 3 hours, and the aging temperature is 70°C. After aging, the slurry is filtered, and the filter cake is washed continuously for many times. The washed filter cake is dried at a drying temperature of 80° C. and a drying time of 24 hours. The dried filter cake is crushed and ground to obtain a pseudo-boehmite product.

Embodiment 2

[0038] Ammonium aluminum sulfate is configured into a solution with an alumina concentration of 40g / l, and 17% concentrated ammonia water and ammonium aluminum sulfate are based on the ammonium root and Al 3+ The molar ratio is 11:1, and flow into the mixer in parallel. After the mixing, the pH value of the slurry is controlled to be greater than 10.5. The material enters the aging kettle, the aging time is 3 hours, and the aging temperature is 70°C. After aging, the slurry is filtered, and the filter cake is washed continuously for many times. The washed filter cake is dried at a drying temperature of 80° C. and a drying time of 24 hours. The dried filter cake is crushed and ground to obtain a pseudo-boehmite product.

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Abstract

The invention provides pseudo-boehmite easy to peptize, and a preparation method of the pseudo-boehmite. The peptization index of the prepared pseudo-boehmite can reach 99%-100%. When the pseudo-boehmite is used for preparing a FCC catalyst, the dosage of hydrochloric acid in a gelling process can be reduced by 60%-70%, so that the production cost of the FCC catalyst is reduced, and the equipmentcorrosion is reduced. According to the invention, the preparation process of pseudo-boehmite is simplified, and the raw materials are mixed by a pipeline mixer at room temperature and then directly enter an aging process, so that the energy consumption is reduced, and the productivity is improved.

Description

technical field [0001] The invention relates to a preparation method of easily peptized pseudo-boehmite, in particular to a preparation method of pseudo-boehmite used for FCC catalyst synthesis. Background technique [0002] Pseudoboehmite, also known as monohydrate alumina, pseudo boehmite, is non-toxic, tasteless, odorless, white colloid (wet product) or powder (dry product), with high crystal phase purity and good peptization performance , Strong cohesiveness, high specific surface area, large pore volume, etc. Its water-containing state is a thixotropic gel. It can be used as binder for semi-synthetic rare earth Y-type molecular sieve cracking catalyst, binder for aluminum silicate refractory fiber, catalyst for alcohol dehydration to ethylene and ethylene oxide catalyst, etc. It can also be used for production of catalyst carrier, activated alumina and others Raw materials for aluminum salts. Its product γ-Al calcined at 400~700℃ 2 o 3 It is widely used as catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J35/10
CPCB01J21/04B01J35/1019
Inventor 李大鹏吕灵灵廉政董莉张新功李恩泉高玮
Owner QINGDAO HUICHENG PETROCHEM TECH
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