Preparation method and application of sulfhydryl activated carbon mercury removal agent

A technology of activated carbon and activated carbon powder, which is applied in separation methods, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of poor mercury removal activity, difficulty in large-scale production and application, and promote modification treatment Effect

Inactive Publication Date: 2016-07-20
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of poor mercury removal activity and difficulty in large-scale production and application of existing modified activated carbon mercury re

Method used

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  • Preparation method and application of sulfhydryl activated carbon mercury removal agent
  • Preparation method and application of sulfhydryl activated carbon mercury removal agent

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Experimental program
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Effect test

Embodiment 1

[0033] The preparation method of the mercapto activated carbon mercury removal agent described in the present embodiment comprises the following steps:

[0034] (1) the activated carbon pulverized to particle size is 100 meshes to obtain the activated carbon powder, for subsequent use;

[0035] Mix thioglycolic acid, acetic anhydride, and concentrated sulfuric acid at a volume ratio of 180:130:2 to form a mercapto-modified solution, which is set aside;

[0036] (2) Soak the activated carbon powder in the mercapto-modified solution, and let it stand at 50° C. for 24 hours, so that the mercapto-modified solution can modify the activated carbon powder to obtain modified activated carbon ;

[0037] (3) The modified activated carbon was washed to neutrality with deionized water, and dried at 80° C. until the water content was 5 wt % to obtain a mercapto activated carbon mercury removal agent, which was designated as mercury removal agent 1#.

Embodiment 2

[0039] The preparation method of the mercapto activated carbon mercury removal agent described in the present embodiment comprises the following steps:

[0040] (1) Mix mercaptoacetic acid, acetic anhydride, and concentrated sulfuric acid at a volume ratio of 220:120:1.5 to form a mercapto-modified liquid, and set aside;

[0041] dissolving polyvinyl alcohol in boiling water to prepare an aqueous binder solution with a mass percentage of polyvinyl alcohol of 10%, for subsequent use;

[0042](2) The activated carbon is crushed to a particle size of 200 meshes to obtain activated carbon powder, the activated carbon powder is uniformly mixed with the binder aqueous solution to form a mixture, and then the mixture is extruded at 8MPa to form a strip, and the formed wet The strips were dried at 110°C until the water content was 20wt%, and then heat-treated at 200°C for 0.5h to obtain activated carbon shaped products;

[0043] (3) Soak the shaped activated carbon in the mercapto-mo...

Embodiment 3

[0046] The preparation method of the mercapto activated carbon mercury removal agent described in the present embodiment comprises the following steps:

[0047] (1) Mix mercaptoacetic acid, acetic anhydride, and concentrated sulfuric acid at a volume ratio of 200:140:1 to form a mercapto-modified liquid, and set aside;

[0048] Dissolving carboxymethyl cellulose in boiling water to prepare a 5% binder aqueous solution with a mass percentage of carboxymethyl cellulose for subsequent use;

[0049] (2) Grinding activated carbon to a particle size of 200 to 300 meshes to obtain activated carbon powder, mixing the activated carbon powder with the binder aqueous solution to form a mixture, and then extruding the mixture at 4MPa to form a strip, after forming The wet strips were dried at 65°C until the water content was 15wt%, and then heat-treated at 240°C for 2 hours to obtain activated carbon moldings;

[0050] (3) Soak the shaped activated carbon in the mercapto-modified solutio...

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Abstract

The invention provides a preparation method of a sulfhydryl activated carbon mercury removal agent.The preparation method comprises the steps that activated carbon is modified by initiatively adopting sulfhydryl modification liquid prepared from mercaptoacetic acid, acetic anhydride and concentrated sulfuric acid, so that hydroxyl on the surface of the activated carbon reacts with mercaptoacetic acid to immobilize sulfhydryl to the activated carbon, and then sulfhydryl activated carbon is prepared.When mercury removal treatment is performed on mercury-containing gas or liquid by adopting the sulfhydryl activated carbon prepared through the preparation method, the sulfhydryl activated carbon shows the relatively high mercury removal precision and mercury penetration capacity, and therefore the sulfhydryl activated carbon prepared through the preparation method can be used as the mercury removal agent.

Description

technical field [0001] The invention relates to the technical field of mercury removal agents, in particular to a preparation method and application of a mercapto activated carbon mercury removal agent. Background technique [0002] Mercury is a highly toxic substance. It has become the most concerned atmospheric toxic pollutant after sulfur dioxide and nitrogen oxides due to its characteristics of volatility, refractory degradation and deposition in organisms. At present, mercury in the atmosphere is mainly Flue gas emissions from the coal combustion process, in addition, mercury will also be released from waste incineration, metallurgy, electronics, chemical and other industrial processes. There are three main forms of mercury in nature, namely gaseous elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate mercury (Hg P ), different forms of mercury have different physical and chemical properties and environmental migration capabilities. For example, part...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02C02F1/28
CPCB01D53/02B01D2257/602B01J20/20C02F1/283
Inventor 李新王春艳樊俐成峻青
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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