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Boric anhydride\ gama-alumina modified membrane for low concentration stack gas desulfurization

A modified and permanent membrane technology, which is applied in the field of boron oxide\gamma-alumina modified membranes for low-concentration flue gas desulfurization, which can solve the problems of poor thermal stability, large pore size of inorganic membranes, and reduced specific surface area Surface chemical structure and other issues, to achieve thermal stability and desulfurization effect improvement, reduce product cost, simplify the effect of the preparation process

Inactive Publication Date: 2006-07-19
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the fly in the ointment of this technical solution is that thermal stability is poor, and the desulfurization effect needs to be further improved
[0006] γ-Al at around 1000°C 2 o 3 phase transition to α-Al 2 o 3 , this phase transition is accompanied by a volume change of 7%, which will cause a rapid increase in the pore size of the inorganic membrane, a sharp decrease in the specific surface area, and a change in the surface chemical structure, which hinder the γ-Al 2 o 3 The composite membrane operates with high efficiency at high temperature, and the desulfurization effect needs to be further improved

Method used

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  • Boric anhydride\ gama-alumina modified membrane for low concentration stack gas desulfurization
  • Boric anhydride\ gama-alumina modified membrane for low concentration stack gas desulfurization
  • Boric anhydride\ gama-alumina modified membrane for low concentration stack gas desulfurization

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1 (H 3 BO 3 The concentration of the solution is 0.1mol / L)

[0025] (1) Preparation of Al(OH) 3 sol

[0026] Using AlCl 3 ·6H 2 O soluble inorganic salt is the starting material. First, weigh 7.2429g AlCl 3 ·6H 2O in a beaker, and then pour 100ml of water solvent to dissolve to make a uniform solution of 0.17mol / L, drip ammonia water during the stirring process, adjust the acidity and alkalinity of the solution to pH=8.5, and form a white precipitate, which is centrifuged The machine is separated at a speed of 3000r / min, and then the prepared precipitate is subjected to 48 hours of precipitation treatment, and 0.5g of the precipitate after precipitation is accurately weighed, and placed in 50ml of deionized water solvent, adjusted to pH = After 3, ultrasonically dispersed for 20 minutes to form a stable 0.13mol / L Al(OH) 3 Sol.

[0027] (2) Preparation of boron-containing composite sol

[0028] Use H 3 BO 3 For the raw material. First, accurately...

Embodiment 2

[0045] Embodiment 2 (H 3 BO 3 The concentration of the solution is 0.5mol / L)

[0046] (1) Preparation of Al(OH) 3 sol

[0047] Using AlCl 3 ·6H 2 O soluble inorganic salt is the starting material. First, weigh 7.2429g AlCl 3 ·6H 2 O in a beaker, and then pour 100ml of water solvent to dissolve, to make a uniform solution of 0.17mol / L, drip ammonia water during the stirring process, adjust the acidity and alkalinity of the solution to pH=10, and form a white precipitate, which is centrifuged The machine is separated at a speed of 3000r / min, and then the prepared precipitate is subjected to 24 hours of precipitation treatment, and 0.5g of the precipitate after precipitation is accurately weighed, and placed in 50ml of deionized water solvent, adjusted to pH = After 4, ultrasonically dispersed for 20 minutes to form a stable 0.13mol / L Al(OH) 3 Sol.

[0048] (2) Preparation of boron-containing composite sol

[0049] Use H 3 BO 3 For the raw material. First, accuratel...

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Abstract

The invention discloses a B2O3 / gamma-Al2O3 modified film at raw material of AlCl3.6H2O and H3BO3, which comprises the following steps: (1) preparing Al (OH) 3 sol; (2) preparing the composite sol with borax; (3) preparing B2O3 / gamma -Al2O3 modified film. The invention improves the heat stability of low dense flue gas and desulfuration effect.

Description

technical field [0001] The present invention relates to the desulfurization of low-concentration flue gas, in particular to B used for desulfurization of low-concentration flue gas 2 o 3 / γ-Al 2 o 3 modified membrane. Background technique [0002] With the rapid development of modern industry and transportation, industry and population are highly concentrated, air pollution has become a big environmental and social problem. where SO 2 Gases are the gaseous pollutants with the largest quantity and wide influence among the current air pollutants. SO 2 The gas most prominently causes acid rain and damages the respiratory function of the human body. For low concentrations of SO 2 (content<3.5%, due to the large amount of flue gas, low concentration=requires a large desulfurization device, which not only has various technical difficulties in engineering and equipment, but also in the selection of absorbent or adsorbent and the production ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D53/22
Inventor 范晓丹张襄楷刘小琴
Owner TIANJIN URBAN CONSTR COLLEGE