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Pseudo thin allophane and its preparation method

A technology of pseudo-boehmite and hydrated alumina, applied in alumina/aluminum hydroxide and other directions, can solve the problems of complex process operation and achieve the effect of concentrated pore distribution

Active Publication Date: 2007-07-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that multiple pH swings are required, and the process operation is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] In a 2-liter reaction tank, 600 milliliters of aluminum sulfate solution with a concentration of 96 grams per liter and an aqueous ammonia solution of 8% were added in parallel to carry out reaction precipitation, and then filtered (using XRD to characterize that the hydrated aluminum oxide precipitate is an amorphous structure) ), the reaction temperature is 40° C., and the flow rate of the ammonia solution is controlled so that the pH of the reaction system is 5. In a 2 liter reaction tank, filter cake, deionized water and ammonia water (concentration is 25%, Beijing chemical plant product) are mixed, beating, and the consumption of ammonia water makes the pH value of slurry be 9.5, and slurry ages at temperature 55 ℃ 60 Minutes later, the filter cake was beaten and washed twice with deionized water, and the filter cake was dried at 120°C for 24 hours to obtain hydrated alumina P1, which was characterized by XRD. P1 had a pseudo-boehmite structure, and P1 was calcined ...

example 2

[0033] In a 2-liter reaction tank, add 600 milliliters of aluminum sulfate solution with a concentration of 48 grams per liter and 8% ammonia solution for reaction and precipitation, and then filter (using XRD to characterize that the hydrated aluminum oxide precipitate is an amorphous structure) ), the reaction temperature was 35° C., and the flow rate of the ammonia solution was controlled so that the pH of the reaction system was 5.8. In a 2-liter reaction tank, filter cake, deionized water and ammonium bicarbonate (product of Beijing Yili Fine Chemicals Co., Ltd.) are mixed and beaten. The amount of ammonia water makes the pH value of the slurry 9.5, and the slurry is heated at a temperature of 35°C. After aging for 240 minutes, filter, the filter cake was beaten and washed twice with deionized water, and the filter cake was dried at 120°C for 14 hours to obtain hydrated alumina P2, which was characterized by XRD. P2 had a pseudo-boehmite structure. Calcined for 4 hours to...

example 3

[0035] In a 2-liter reaction tank, 600 milliliters of aluminum sulfate solution with a concentration of 96 grams per liter and an aqueous ammonia solution of 8% were added in parallel to carry out reaction precipitation, and then filtered (using XRD to characterize that the hydrated aluminum oxide precipitate is an amorphous structure) ), the reaction temperature is 50°C, and the flow rate of the ammonia solution is controlled so that the pH of the reaction system is 4.5. In a 2-liter reaction tank, filter cake, deionized water and sodium carbonate (chemically pure, Beijing Yili Fine Chemicals Co., Ltd. product) are mixed and beaten, and the amount of sodium carbonate makes the pH value of the slurry be 8.5, and the slurry is at temperature After aging at 35°C for 30 minutes, filter, the filter cake was beaten and washed twice with deionized water, and the filter cake was dried at 120°C for 14 hours to obtain hydrated alumina P3, which was characterized by XRD. P3 had a pseudo-...

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Abstract

This invention discloses a pseudoboehmite and its preparation method. This pseudoboehmite is prepared by following steps: a) at acidity condition that can make aluminum precipitate, precipitate aluminum of aluminum compound water solution, separate, and get a kind of amorphous alumina hydrate; b) mix amorphous hydrated aluminum oxide with water and at least one kind of water-soluble alkali, slurry, stabilize at 20deg-90deg for 0.2-6 hours, wherein dosage of above alkali make serumal pH be 6-11. Compared with existing technique, pseudoboehmite prepared by this invention can get aluminum oxide of bore distributing localized by calcining.

Description

technical field [0001] The invention relates to a hydrated alumina and a preparation method thereof, in particular to a pseudo-boehmite and a preparation method thereof. Background technique [0002] Alumina, especially γ-alumina, is often used as a carrier for the preparation of catalysts because of its good pore structure, specific surface area and thermal stability. The precursor of alumina is hydrated alumina, such as pseudoboehmite, whose particle size, morphology, crystallinity and miscellaneous crystal content all affect the properties of the alumina carrier, such as pore volume, pore distribution, and specific surface area. In the prior art, by adjusting the particle size, morphology, crystallinity and other properties of hydrated alumina, people can obtain alumina carriers that can meet specific needs. [0003] For pseudo-boehmite, in the prior art, aluminum-containing compounds are usually precipitated and aged in the pH range of 6-11 (USP4555394, USP4562059). Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 曾双亲杨清河刘滨胡大为聂红李大东
Owner CHINA PETROLEUM & CHEM CORP
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