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A flue gas desulphurization and regeneration method for an ordered graded porous carbon material

A technology for grading porous carbon and flue gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as difficult practical application, inability to provide migration power, and reduction of activated carbon

Active Publication Date: 2017-12-15
TIANJIN CHENGJIAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] (1) Coal is usually used as a raw material for the preparation of desulfurization activated carbon, and the structure of the raw material itself is disordered and complex, which determines that the pore structure forming activated carbon is disordered and complex: the pore shape has slit shape, cone shape and crack, etc. It is difficult to adjust the morphology of the pores; the pore structure includes cross-linked pores, blind pores and closed pores, etc., and it is difficult to control the connectivity of micropores and mesopores
Therefore, the intricate pore structure is difficult to provide for adsorbate diffusion and H 2 SO 4 Physical pathways for migration from micropores to mesopores
[0005] (2) The type and quantity of functional groups on the surface of the activated carbon pore structure, especially the distribution of functional groups, are difficult to be effectively controlled
The active sites on the pore surface are disorderly distributed, unable to provide H 2 SO 4 The migration kinetics from micropores to mesopores makes H 2 SO 4 Blocking micropores reduces SO adsorption by activated carbon 2 ability; 2 SO 4 It is difficult to migrate to the outer surface, causing the carbon structure to be consumed during the thermal regeneration process, increasing material consumption
[0006] (3) Due to the pore structure and surface chemical properties of the existing desulfurization activated carbons mentioned in (1) and (2), the sulfur capacity of activated carbons is low, and the amount of activated carbons used is relatively large
However, the complex pore structure and chemical properties directly lead to low regeneration efficiency, and the H 2 SO 4 The precipitation efficiency is only about 40%, and it is difficult to obtain practical application
[0008] (5) The existing desulfurization activated carbon preparation methods often aim to increase the sulfur capacity, or increase the pore volume of micropores and mesopores, or enhance the surface chemical activity, but they cannot solve the by-product H 2 SO 4 Parsing Difficult Problems

Method used

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  • A flue gas desulphurization and regeneration method for an ordered graded porous carbon material
  • A flue gas desulphurization and regeneration method for an ordered graded porous carbon material
  • A flue gas desulphurization and regeneration method for an ordered graded porous carbon material

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Embodiment 1

[0038] (1) Melt 40g of phenol at 45°C, add 8.5g of 20% NaOH aqueous solution drop by mass, stir for 10min, then add formaldehyde solution with a mass concentration of 37% dropwise, wherein the molar ratio of phenol / formaldehyde It is 1:3. The mixed solution was reacted at 85° C. for 1 h, then cooled to room temperature, and the pH value of the mixed solution was adjusted to 7.0 with 20% HCl aqueous solution. The mixed solution was dried in a rotary evaporator to obtain a phenolic resin oligomer, which was prepared by adding absolute ethanol to prepare a phenolic resin solution with a mass fraction of 15% for use.

[0039] Take the mixture of triblock copolymer F127 and P123 as the template agent, wherein the mass ratio of P123 / F127 is 1:3, mix the phenolic resin solution with the ethanol solution of the template agent with a mass percentage of 10%, and stir until a uniform solution is obtained, The mass ratio of the phenolic resin to the template agent is 1:1. The obtained s...

Embodiment 2

[0043] (1) Melt 40g of phenol at 45°C, add 8.5g of 20% NaOH aqueous solution dropwise, stir for 10min, then add dropwise a 37% formaldehyde aqueous solution, wherein the molar ratio of phenol / formaldehyde It is 1.2:3. The mixed solution was reacted at 85° C. for 2 h, then cooled to room temperature, and the pH value of the mixed solution was adjusted to 7.0 with 20% by mass percent HCl aqueous solution. The mixed solution was dried in a rotary evaporator to obtain a phenolic resin oligomer, which was prepared by adding absolute ethanol to prepare a phenolic resin solution with a mass fraction of 15% for use.

[0044] Take the mixture of triblock copolymer F127 and P123 as the template agent, wherein the mass ratio of P123 / F127 is 1:2, mix the phenolic resin solution with the ethanol solution of the template agent with a mass percentage of 10%, and stir until a uniform solution is obtained, The mass ratio of the phenolic resin to the template agent is 1:1. The obtained soluti...

Embodiment 3

[0048] (1) 45g phenol is melted at 50 ℃, dropwise adding 10g mass concentration is 20% NaOH aqueous solution, stirs 10min, then dropwise adding dropwise is 37% formaldehyde aqueous solution, wherein the mol ratio of phenol / formaldehyde is 1:3. The mixed solution was reacted at 90°C for 1 h, then cooled to room temperature, and the pH value of the mixed solution was adjusted to 7.0 with 20% HCl aqueous solution. The mixed solution was dried in a rotary evaporator to obtain a phenolic resin oligomer, which was prepared by adding absolute ethanol to prepare a 20% by mass phenolic resin solution for use.

[0049]Take the mixture of triblock copolymer F127 and P123 as the template agent, wherein the mass ratio of P123 / F127 is 1:1, mix the phenolic resin solution with the ethanol solution of the template agent with a mass percentage of 10%, and stir until a uniform solution is obtained, The mass ratio of the phenolic resin to the template agent is 1:1. The obtained solution was tr...

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Abstract

A flue gas desulphurization and regeneration method for an ordered graded porous carbon material is disclosed. Phenolic resin and a triblock copolymer are adopted as raw materials to prepare a porous polymer, and then activation is performed by utilizing nitrogen and ammonia to obtain a microporous-mesoporous graded carbon structure. When the carbon material is applied in flue gas desulphurization techniques, the sulfur capacity of activated carbon can be effectively increased, H2SO4 that is a byproduct is more liable to be separated from pore structures, and 80% or above of the H2SO4 can be separated out by adopting a water washing method and is far higher than water washing regeneration efficiencies at present. A high-temperature reaction between H2SO4 and carbon is avoided so that a regeneration process is nearly free of carbon loss.

Description

technical field [0001] The technology of the present invention belongs to the technical field of carbon materials, and more specifically relates to a flue gas desulfurization regeneration method of carbon materials with ordered hierarchical pores. Background technique [0002] Activated carbon flue gas desulfurization technology has the pollutant SO 2 The advantages of resource utilization, less water resource consumption, no secondary pollution, and harmless recycling of absorbents have attracted the attention of researchers at home and abroad. The basic principle is to utilize the well-developed micropores to absorb SO in the flue gas 2 , O 2 、H 2 O and other gases are adsorbed and catalyzed to make SO 2 converted to H 2 SO 4 , and migrate and exist in the mesopores and macropores, empty the micropores and their active sites, and continuously adsorb SO 2 . Therefore, the desulfurization activated carbon with excellent performance should have: extremely developed mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/336B01D53/02B01D53/86B01D53/50
CPCB01D53/02B01D53/8609B01D2253/102B01D2253/308B01D2258/0283C01P2006/12C01P2006/14C01P2006/16
Inventor 朱玉雯刘翠萍李浩宇代乾苗艳芳
Owner TIANJIN CHENGJIAN UNIV
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