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Method for preparing modified carbon-based mercury removal adsorbent

A technology for modifying carbon and adsorbents, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of inability to large-scale commercial use, weak adsorption capacity of biomass coke, and high cost, and achieve multi-polarity effect of chemical utilization

Inactive Publication Date: 2019-09-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing activated carbon mercury removal adsorbents have the disadvantages of high cost and inability to be commercialized on a large scale, and the existing biomass coke adsorption capacity is not strong

Method used

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  • Method for preparing modified carbon-based mercury removal adsorbent
  • Method for preparing modified carbon-based mercury removal adsorbent
  • Method for preparing modified carbon-based mercury removal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Use a crusher to crush the original biomass, and use the corresponding standard sieve to sieve to obtain samples within the range of 100-200 mesh; put the samples to be processed into a crucible and place them in a muffle furnace for 500 o C for 10min pyrolysis; weigh 5g of biomass char sample and add 100ml of 3%NH 4 In the Cl solution, the magnetic stirrer was used to continuously stir for 12 h, and the stirred solution was left to stand at room temperature for 24 h. Wash the mixed solution with deionized water until the filtrate is neutral, and remove the obtained biomass modified coke at 40 o C drying, placed in a reagent bottle for storage, to obtain a modified biomass coke flue gas mercury removal agent.

Embodiment 2

[0027] Use a crusher to crush the raw biomass, and use the corresponding standard sieve to obtain samples within the range of 100-200 mesh; put the samples to be processed into a crucible and place them in a muffle furnace for 600 o C for 10min pyrolysis; weigh 5g of biomass char sample and add 100ml of 3%NH 4 In the Cl solution, the magnetic stirrer was used to continuously stir for 12 h, and the stirred solution was left to stand at room temperature for 24 h. Wash the mixed solution with deionized water until the filtrate is neutral, and remove the obtained biomass modified coke at 50 o C drying, placed in a reagent bottle for storage, to obtain a modified biomass coke flue gas mercury removal agent.

Embodiment 3

[0029] Use a crusher to crush the original biomass, and use the corresponding standard sieve to sieve to obtain samples within the range of 100-200 mesh; put the samples to be processed into a crucible and place them in a muffle furnace for 500 o C for 15min pyrolysis; weigh 5g of biomass char sample and add 100ml of 4%NH 4 In the Cl solution, the magnetic stirrer was used to continuously stir for 15 h, and the stirred solution was left to stand at room temperature for 24 h. Wash the mixed solution with deionized water until the filtrate is neutral, and remove the obtained biomass modified coke at 50 o C drying, placed in a reagent bottle for storage, to obtain a modified biomass coke flue gas mercury removal agent.

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Abstract

The invention discloses a method for preparing a modified carbon-based mercury removal adsorbent. The method comprises the following steps: soaking biomass coke granules into an NH4Cl solution in a mass ratio of (1-2):4, and carrying out uniform stirring and mixing so as to obtain an NH4Cl biomass liquid-solid mixture; and leaving the mixture to stand for 24 hours or longer at room temperature, carrying out water washing to neutral, and carrying out filtering and drying, so as to obtain the modified carbon-based mercury removal adsorbent. As the NH4Cl solution is adopted for modification, the number of functional groups on the surface of biomass coke is effectively increased, a surface pore structure is enriched, the adsorption capability of the adsorbent is greatly increased, and the method has the advantages of being low in cost, small in pollution, environment-friendly, convenient in industrial popularization, and the like.

Description

technical field [0001] The invention belongs to the field of resource utilization of biomass and mercury removal from coal-fired flue gas, and relates to an NH 4 A preparation method of a Cl-modified carbon-based mercury-removing adsorbent. Background technique [0002] Mercury is a globally circulating element, a toxic substance that can permanently accumulate in organisms and food chains, and can cause severe damage to the nerves and deep tissues in humans. Mercury can be transformed into organic compounds (such as methylmercury and dimethylmercury) under the action of microorganisms, and accumulate and migrate in the environment for a long time through various ways, destroying the ecological environment and causing great harm to human life and health. Activated carbon has good adsorption performance and can effectively remove mercury in flue gas. However, due to the high cost of activated carbon, biomass has become an alternative. Biomass is a substance that converts s...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01D53/02B01J20/30
CPCB01J20/20B01D53/02B01D2257/602B01D2258/0283
Inventor 王卉沈昊天应展烽
Owner NANJING UNIV OF SCI & TECH
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