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Method for preparing pseudo-boehmite with large pore volume and high specific surface area

A technology of pseudo-boehmite and high specific surface, which is applied in the direction of alumina/aluminum hydroxide to achieve the effect of shortening the process flow, large pore volume and high specific surface

Inactive Publication Date: 2006-12-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of the existing sodium aluminate solution seed crystal decomposition technology is that the decomposition products are usually low value-added metallurgical grade alumina products such as gibbsite or boehmite

Method used

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  • Method for preparing pseudo-boehmite with large pore volume and high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A certain amount of SB powder is added to the compound containing 140g / L-Al 2 o 3 , causticization coefficient α K In the 40ml sodium aluminate solution of 1.30, the addition amount of SB powder is the same as that of Al in the sodium aluminate solution 2 o 3 The weight ratio is 1:1, continuous hydrothermal decomposition at 125°C for 3 hours, and the decomposition rate is 31.7%; the decomposition product is cooled, vacuum filtered, and washed with deionized water to neutrality, and dispersed with ethanol twice the volume of the solid And washing, after the filter cake was dried at 100°C for 12 hours, the dried product was detected by XRD as 100% pseudo-boehmite, and its specific surface area and pore volume measured by a fully automatic specific surface and porosity analyzer were 176.8 m 2 / g and 0.59cm 3 / g.

Embodiment 2

[0031] Embodiment 2: A certain amount of SB powder is added to the compound containing 110g / L-Al 2 o 3 , causticization coefficient α K In 40ml sodium aluminate solution of 1.75, the addition amount of SB powder is the same as that of Al in sodium aluminate solution 2 o 3 The weight ratio is 1:1, continuous hydrothermal decomposition at 100°C for 16 hours, and the decomposition rate is 16.2%; the decomposition product is cooled, vacuum filtered, and washed with deionized water to neutrality, and dispersed with ethanol 4 times the volume of the solid And washed, after the filter cake was dried at 120°C for 10 hours, the dried product was detected by XRD as 100% pseudo-boehmite, and its specific surface and pore volume measured by a fully automatic specific surface and porosity analyzer were 195.2 m 2 / g and 0.86cm 3 / g.

Embodiment 3

[0032] Embodiment 3: A certain amount of SB powder is added to the powder containing 200g / L-Al 2 o 3 , causticization coefficient α K In the 40ml sodium aluminate solution of 1.30, the addition amount of SB powder is the same as that of Al in the sodium aluminate solution 2 o 3 The weight ratio is 1:1, continuous hydrothermal decomposition at 150°C for 9 hours, and the decomposition rate is 23.1%; the decomposition product is cooled, vacuum filtered, and washed with deionized water to neutrality, and then dispersed with ethanol twice the volume of the solid And washed, after the filter cake was dried at 110°C for 11 hours, the dried product was detected by XRD as 100% pseudo-boehmite, and its specific surface and pore volume measured by a fully automatic specific surface and porosity analyzer were 181.3 m 2 / g and 0.78cm 3 / g.

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Abstract

The invention discloses a preparing method of large-hole high-specific surface thin diaspore, which comprises the following steps: adding SB powder in the sodium aluminate solution with 110-200g / L-Al2O3 and 1.30-1.75 causticization coefficient; setting the quality rate of seed quantity and Al2O3 quality at 1.0 constantly; decomposing at 100-150 deg.c water heating condition for 3-6 h; sucking the cooled decomposed product; washing to neutral; washing through alcohol; drying; obtaining the product. The invention possesses high-seed activity and excellent water heating stability, which can provide higher-distinguishing rate within lower seed and shorter decomposing time.

Description

technical field [0001] The invention relates to the preparation of pseudo-boehmite, in particular to a method for preparing pseudo-boehmite with large pore volume and high specific surface area by hydrothermally decomposing sodium aluminate solution with SB powder as crystal seed. Background technique [0002] Pseudoboehmite is a chemical alumina with uncertain composition, incomplete crystallization, and controllable properties. Its chemical formula is γ-AlOOH·nH 2 O (n=0.08~0.62), its crystal structure is similar to that of boehmite (γ-AlOOH), and its typical structure is a very thin wrinkled sheet. γ-Al obtained by roasting pseudoboehmite 2 o 3 The specific surface is high, and it is widely used as a catalyst carrier in the petrochemical field, and the γ-Al obtained by roasting boehmite 2 o 3 The specific surface is low, and it is generally difficult to be used in the field of catalysis. [0003] SB powder is a kind of high-quality pseudo-boehmite produced by high-pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 蔡卫权
Owner WUHAN UNIV OF TECH
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