Dechlorinating agent used for removing HCl from gas by dry method and preparation method thereof

A technology of dechlorination agent and dry method, which is applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of small volume of exchangeable cations, limited pore volume and specific surface, and achieve simple preparation process, dechlorination The effect of high chlorine activity and low temperature penetration chlorine capacity

Inactive Publication Date: 2010-07-14
长春惠工净化工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general bentonite has limited pore volume and specific surface area due to the small volume of exchangeable cations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The dry process dechlorination agent preparation method that removes HCl from gas comprises following order and steps:

[0042] a. Dissolve NaOH with half of deionized water to make NaOH aqueous solution;

[0043] b. The other half of the deionized water dissolves one of the three aluminum salts to make an aluminum salt solution;

[0044] c. Add NaOH aqueous solution dropwise to aluminum salt aqueous solution under stirring to make aluminum sol;

[0045] d. Add sodium bentonite to the aluminum sol, stir and beat to make a cross-linked bentonite slurry;

[0046] e, Methyl cellulose, MgO, CaCO in turn 3 , CaO, Na 2 CO 3 Added to the cross-linked bentonite slurry;

[0047] f. Mixing and rolling, extrusion molding, drying temperature is room temperature -120°C, time is 3h-4d, roasting temperature is 350°C-400°C, time is 4h to make dry dechlorination agent.

Embodiment 1

[0049] Take 33g of NaOH and add 200g of deionized water to make NaOH aqueous solution. AlCl 3 .6H 2 O 100g, add deionized water 200g, make aluminum salt solution. Under stirring, NaOH aqueous solution was added dropwise to aluminum salt aqueous solution to make aluminum sol. Add 200g of sodium-based bentonite to the aluminum sol, stir and beat to make a cross-linked bentonite slurry. Add 50g methylcellulose, 200g MgO, 400g CaCO to the cross-linked bentonite slurry in sequence 3 , 350g CaO, 50g Na 2 CO 3 , mixed rolling, extrusion molding. Drying at 100°C for 3h, calcining at 400°C for 4h, the specific surface area is 75 / m 2 .g -1 , pore volume 0.32 / mL.g -1 , Lateral compression strength 71 / N.cm -1 , chlorine capacity 15.8 / % * A dechlorination agent for removing HCl from gases.

Embodiment 2

[0051] Take 33g of NaOH and add 200g of deionized water to make NaOH aqueous solution. Take Al(NO 3 ) 3 .9H 2 O 155g, add deionized water 200g, make aluminum salt aqueous solution. Under stirring, NaOH aqueous solution was added dropwise to the aluminum salt solution to make aluminum sol. Add 200g of sodium-based bentonite to the aluminum sol, stir and beat to make a cross-linked bentonite slurry. Add 50g methylcellulose, 200g MgO, 400g CaCO to the cross-linked bentonite slurry in turn 3 , 350g CaO, 50g Na 2 CO 3 , mixed rolling, extrusion molding. Drying at 120°C for 3h, calcining at 400°C for 4h, the specific surface area is 81 / m 2 .g -1 , pore volume 0.35 / mL.g -1 , Lateral compression strength 73 / N.cm -1 , chlorine capacity 16.9 / % * A dechlorination agent for removing HCl from gases.

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Abstract

The invention relates to a dechlorinating agent used for removing HCl from a gas by using a dry method and a preparation method thereof. The dechlorinating agent is prepared from Na2CO3, CaCO3, CaO and MaO as active constituents, crosslinked bentonite as a porous auxiliary agent, and methyl cellulose as a foaming agent and an auxiliary extrusion agent through extrusion forming, drying and roasting. The cross-linked bentonite is prepared by exchanging large-size poly aluminum cation with small-size simple cation, so that the crosslinked bentonite has great porosity factor and large specific surface. The specific surface and the pore volume of the crosslinked bentonite are larger than those of non-crosslinked bentonite. By using the crosslinked bentonite as the porous auxiliary agent, the specific surface of the dechlorinating agent is enlarged, and the dechlorinating activity and the chlorosity of the dechlorinating agent are increased. The dechlorinating agent prepared by using the crosslinked bentonite has a pore volume of 0.3-0.4 mL/g, a specific surface of 70-90 m<2>/g and a crushing strength of 60-80 N/cm, not only has lower price than pseudo-boehmite and a molecular sieve, but also has simple preparation process, high dechlorinating activity and great low-temperature penetration chlorosity.

Description

Technical field: [0001] The invention relates to an oil refining and chemical purification technology, in particular to a dry dechlorination agent for removing HCl from gas and a preparation method thereof. Background technique: [0002] The active components of the dechlorination agent used for dry HCl removal are oxygen-containing compounds of alkali metals and alkaline earth metals, generally oxides, hydroxides and carbonates, which are conversion absorption dechlorination agents, and are gas-solid phase Acid-base neutralization reaction. The reaction first starts from the surface of the dechlorination agent, and then goes deep into the inner layer of the active component. The reaction on the surface is very fast, but it is slow to penetrate deep into the inner layer, which is the resistance of the reaction. The specific surface of the dechlorination agent is large, and the resistance of the dechlorination reaction is small. Therefore, the specific surface of the dechlo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/68B01J20/30B01J20/16
Inventor 陆久民阎富山王绍武张传生赵伟李红琳刘福全
Owner 长春惠工净化工业有限公司
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