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Preparation, use and regeneration methods of green adsorbent for flue gas desulfurization and denitrification

A desulfurization, denitrification, and adsorbent technology, applied in the field of flue gas purification, can solve the problems of enhanced solvent acidity, corrosive equipment, and increased operating costs, and achieve the effects of improved interaction force, high removal efficiency, and good regeneration effect

Pending Publication Date: 2020-12-15
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention discloses a method for preparing, using and regenerating a green adsorbent for flue gas desulfurization and denitrification. It is difficult for flue gas nitrogen oxides to meet the emission standards; after absorbing flue gas, the acidity of the solvent increases, which is easy to corrode equipment and increase operating costs; the dust in the flue gas enters the choline-like deep eutectic solvent, and the solvent is difficult to regenerate, etc.

Method used

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  • Preparation, use and regeneration methods of green adsorbent for flue gas desulfurization and denitrification
  • Preparation, use and regeneration methods of green adsorbent for flue gas desulfurization and denitrification
  • Preparation, use and regeneration methods of green adsorbent for flue gas desulfurization and denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] At normal temperature and pressure, 100mg 1,4-benzenediboronic acid (BDBA), 10mL mesitylene, 10mL 1,4-dioxane and 150mg 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) was added to the tetrafluoroethylene liner and stirred for 10 minutes. Then put the liner with the mixture into the autoclave, seal the autoclave, heat to 120°C, take out the powder at the bottom of the liner after staying for 72 hours, wash with ethanol and put the washed powder in a vacuum Dry in a drying oven at 60°C. Finally, the gray-purple solid powder was obtained as a covalent organic framework material (COF-5).

[0039] Get 20g choline chloride and 26mL oxalic acid according to the mol ratio 1:2 of choline chloride and oxalic acid, temperature is controlled at 25 ℃, stirs at a constant speed, obtains choline chloride-oxalic acid deep eutectic solvent ( DES).

[0040] According to the impregnation ratio of covalent organic framework and deep eutectic solvent of 0.15, take 5.00g of covalent organic...

Embodiment 2

[0042] The preparation method of the covalent organic framework material (COF-5) is the same as in Example 1.

[0043] According to the molar ratio of choline chloride and oxalic acid 1:3, take 20g choline chloride and 39mL oxalic acid, control the temperature at 25°C, and stir at a constant speed to obtain the choline chloride-oxalic acid deep eutectic solvent (DES).

[0044] The preparation method of the covalent organic covalent framework-loaded deep eutectic solvent adsorbent (DES@COF-5) is the same as in Example 1, and the covalent organic covalent framework-loaded deep eutectic solvent adsorbent B is obtained.

Embodiment 3

[0046] The preparation method of the covalent organic framework material (COF-5) is the same as in Example 1.

[0047] According to the molar ratio of choline chloride and oxalic acid 1:4, take 20g choline chloride and 52mL oxalic acid, control the temperature at 25°C, and stir at a constant speed to obtain the choline chloride-oxalic acid deep eutectic solvent (DES).

[0048] The preparation method of the covalent organic covalent framework-loaded deep eutectic solvent adsorbent (DES@COF-5) is the same as in Example 1, and the covalent organic covalent framework-loaded deep eutectic solvent adsorbent C is obtained.

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Abstract

The invention discloses preparation, use and regeneration methods of a green adsorbent for flue gas desulfurization and denitrification. The preparation method comprises the following steps: (1) uniformly mixing 95-105 mg of 1,4-benzenediboronic acid (BDBA), 9-11 ml of mesitylene, 9-11 ml of 1,4-dioxane and 145-155 mg of 2,3,6,7,10,11-hexahydroxy triphenylene (HHTP) under normal temperature and pressure, and performing heating to prepare a covalent organic framework material (COF-5); (2) uniformly mixing choline chloride serving as a hydrogen bond receptor and acetic acid serving as a hydrogenbond donor in a molar ratio of (1:2) to (1:5) at a room temperature to obtain a choline deep eutectic solvent; and (3) mixing the organic covalent framework material with the choline eutectic solventaccording to an impregnation ratio of 0.08-0.38 to prepare a covalent organic framework material-loaded deep eutectic solvent (DES@COF-5), namely the flue gas desulfurization and denitrification adsorbent. Meanwhile, the invention discloses a use method and a regeneration method of the adsorbent. The removal efficiency of the adsorbent on SO2 and NOx in flue gas is greater than 95%, and the adsorbent is simple in preparation process, low in cost, easy to regenerate and capable of being recycled for multiple times.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to the preparation, use and regeneration method of a green adsorbent for flue gas desulfurization and denitrification. Background technique [0002] Combustion of coal and fossil fuels emits large amounts of sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ), seriously polluting the human living environment. In recent years, with the strengthening of national environmental protection, SO in flue gas 2 and NO x It must be purified to meet the requirements of emission standards. At present, the desulfurization technology mainly adopts limestone-gypsum wet method, the utilization rate of desulfurization gypsum is low, the water consumption is huge, and the products after desulfurization cause secondary pollution. The denitrification technology is mainly based on NH 3 Selective Catalytic Reduction of NOx (SCR) technology as a reducing agent is the main technology. This...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/34B01J20/30B01D53/02
CPCB01J20/226B01J20/3458B01D53/02B01D2259/4009B01D2258/0283B01D2257/302B01D2257/402B01D2257/404Y02C20/10Y02A50/20
Inventor 窦金孝魏傲然李华赵永奇段晓谞柴红宁张春霞
Owner UNIV OF SCI & TECH LIAONING
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