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A modified non-carbon-based mercury-removing adsorbent and its preparation method

An adsorbent, non-carbon technology, applied in the field of modified non-carbon-based mercury removal adsorbent and its preparation, can solve the problems of complex chemical impregnation method modification, limited development of ACI technology, increase in adsorbent preparation cost, etc. Beneficial for harmless utilization, increasing mercury removal performance, saving energy and time

Active Publication Date: 2021-08-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical impregnation method can greatly improve the mercury removal performance of the adsorbent, but the chemical impregnation method is complicated to modify, consumes a lot of time, and consumes a large amount of chemical reagents, which undoubtedly increases the preparation cost of the adsorbent and limits the development of ACI technology.

Method used

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  • A modified non-carbon-based mercury-removing adsorbent and its preparation method
  • A modified non-carbon-based mercury-removing adsorbent and its preparation method
  • A modified non-carbon-based mercury-removing adsorbent and its preparation method

Examples

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preparation example Construction

[0029] The preparation method mainly includes the following steps: after grinding and mixing polyvinyl chloride with carbon-based adsorbents and non-carbon-based adsorbents, they are put into a tube furnace for airtight heat treatment, so as to enrich the chlorine element in polyvinyl chloride Collected on the surface of the adsorbent, a polyvinyl chloride modified carbon-based / non-carbon-based mercury-removing adsorbent under heat treatment conditions is obtained.

[0030] When heated, the low-molecular substances in the mixture are volatilized first, and then two types of reactions, decomposition and polycondensation, will occur to precipitate tar and gas, thereby forming active vacancies. During this process, polyvinyl chloride undergoes mixed interactions with carbon-based / non-carbon-based sorbents.

[0031] In this embodiment, the carbon-based adsorbent is any one of activated carbon, carbon nanotubes, graphene, activated carbon fiber, and carbon molecular sieve; the non-...

Embodiment 1

[0046] The preparation method of the modified carbon-based / non-carbon-based mercury-removing adsorbent provided in Example 1 of the present invention mainly includes the following steps:

[0047] (1) Grind polyvinyl chloride and coconut shell activated carbon separately to obtain powders with a particle size of 0.5 mm to 10 mm.

[0048] (2) Put the sieved polyvinyl chloride powder and coconut shell activated carbon into a constant temperature drying oven at 105°C for 24 hours to remove the influence of moisture on the experiment.

[0049] (3) Select the mass ratio of dried polyvinyl chloride powder and coconut shell activated carbon as 1:1, put them into the reactor and mix them thoroughly.

[0050] (4) Put the fully mixed mixture in the reactor into the tube furnace, select nitrogen as the heating atmosphere, the flow rate of nitrogen is 1L / min, raise the temperature of the tube furnace to 250°C, and the heating rate is 10°C / min min, the mixture was heated for 30 minutes and...

Embodiment 2

[0053] The preparation method of the modified carbon-based / non-carbon-based mercury-removing adsorbent provided in Example 2 of the present invention mainly includes the following steps:

[0054] (1) Grinding and sieving polyvinyl chloride and zeolite molecular sieve to obtain powders with a particle size of 0.5 mm to 10 mm.

[0055] (2) Put the screened polyvinyl chloride powder and zeolite molecular sieve into a constant temperature drying oven at 105°C for 24 hours to remove the influence of moisture on the experiment.

[0056] (3) Select the mass ratio of the dried polyvinyl chloride powder and the zeolite molecular sieve to be 1:1, put them into the reactor and mix them thoroughly.

[0057] (4) Put the fully mixed mixture in the reactor into the tube furnace, select nitrogen as the heating atmosphere, the flow rate of nitrogen is 1L / min, raise the temperature of the tube furnace to 300°C, and the heating rate is 10°C / min min, the mixture was heated for 30 min and then co...

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Abstract

The invention belongs to the technical field related to environmental protection, and discloses a modified carbon-based / non-carbon-based mercury-removing adsorbent and a preparation method thereof. After the agent is ground and mixed, put it into a tube furnace for airtight heat treatment, so as to enrich the chlorine element in the polyvinyl chloride on the surface of the adsorbent, thereby obtaining a modified carbon-based / non-carbon-based mercury-removing adsorbent; heating At the same time, the low-molecular substances in the mixture will be volatilized first, and then there will be two types of reactions of decomposition and polycondensation to precipitate tar and gas, thereby forming active vacancies. Mixing interaction occurs; due to its thermoplasticity and chlorine released during thermal conversion, polyvinyl chloride will combine with active vacancies and be adsorbed on the micropores or surface of the adsorbent to form mercury removal active sites, greatly improving mercury removal performance. The preparation process of the invention is simple, high in efficiency and low in cost.

Description

technical field [0001] The invention belongs to the technical field related to environmental protection, and more specifically relates to a modified non-carbon-based mercury-removing adsorbent and a preparation method thereof. Background technique [0002] In recent years, with the increase of population and the rapid development of economy, the improvement of people's living standards and the improvement of urban living standards have also led to an unprecedented increase in the amount of urban solid waste. Urbanization, population growth and industrialization have produced a large amount of waste. for three main reasons. Improving the collection, recycling and disposal of municipal solid waste is a current concern as the social, environmental and financial impacts of growing waste generation are of increasing concern. At present, the disposal methods of municipal solid waste mainly include landfill, incineration and pyrolysis. Landfill is a traditional solid waste treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/18B01J20/12B01J20/08B01J20/04B01J20/30B01D53/02
CPCB01D53/02B01D2257/602B01J20/02B01J20/041B01J20/08B01J20/12B01J20/186B01J20/20B01J20/205B01J20/3078B01J2220/4887
Inventor 罗光前吉庆钰邹仁杰方灿李显姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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