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Method for synchronous defluorination and denitration by using composite absorbent

An absorbent and defluorination technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problem of the inability to achieve integrated and efficient removal of harmful components such as sulfur, nitric acid, dust, and fluorine, and the inability to adapt to various Complicated working conditions, high cost of adsorbent and membrane materials, etc., to achieve strong absorption effect, convenient operation and low cost

Pending Publication Date: 2022-07-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the adsorption method and membrane separation method have certain effects on the removal of HF, the cost of the adsorbent and membrane materials is relatively high, and industrial application cannot be truly realized.
[0007] Chinese Patent Publication No. CN112138500 A discloses "a vehicle-mounted sulfur, nitric acid, dust and fluorine integrated deep purification device and its use method". Containing cobalt, ferrous and other complexing agents or NaClO 2 , KMnO 4 、H 2 o 2 Oxidant such as and microemulsion absorber etc., the cost of absorber used in this method is higher and is unfavorable for the recycling of absorber
Chinese Patent Publication No. CN 208032296 U discloses "A Gas Purification Tower and Gas Purification Equipment". Effectively increase the contact area between the bubbles and the liquid medicine, but in essence, the purification method is still the traditional chemical reaction absorption, the purification efficiency of fluorine, nitrate and other gases is not high, and it cannot adapt to various complex working conditions, nor can it be done Integrated and efficient removal of harmful components such as sulfur, nitrate, dust and fluorine

Method used

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  • Method for synchronous defluorination and denitration by using composite absorbent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the method for simultaneous denitration and defluorination of this composite absorbent is as follows:

[0022] 1. Preparation of hydrophobic ionic liquid membrane: the organic membrane is polyethersulfone membrane, and the hydrophobic ionic liquid is [C 8 F 13 MIM][Tf 2 N] (the ionic liquid [C 8 F 13 MIM][Tf 2 N] is obtained with reference to the following literature methods: Baltus R E , Counce RM , Culbertson B H , et al. Examination of the Potential of IonicLiquids for Gas Separations[J]. Separation Science and Technology, 2005, 40(1):525-541 .), the bulk polyethersulfone membrane was dried and weighed, the mass of the membrane body was 18 g, and the membrane thickness was 200 μm; the dried polyethersulfone membrane was immersed in the hydrophobic ionic liquid [C 8 F 13 MIM][Tf 2 N], let stand for 5h to make the ionic liquid fully fill the pores of the membrane body; gently wipe off the excess ionic liquid on the outer surface of the membrane wit...

Embodiment 2

[0024] Embodiment 2: the method for simultaneous denitration and defluorination of this composite absorbent is as follows:

[0025] 1. Preparation of hydrophobic ionic liquid membrane: the organic membrane body is nylon membrane, and the hydrophobic ionic liquid is [MATMA][BF 4 ] (the ionic liquid [MATMA][BF in the present invention 4 ] Prepared with reference to the following literature methods: Jianbin T , Tang H , SunW , et al. Poly(ionic liquid)s: a new material with enhanced and fast CO 2 absorption[J]. Chemical Communications, 2005(26):3325-3327.), the block nylon membrane was dried and weighed, the mass of the membrane body was 20g, and the thickness of the membrane was 300μm; the dried nylon membrane was immersed in Hydrophobic ionic liquid [MATMA][BF 4], let stand for 9 h to make the ionic liquid fully fill the pores of the support body; gently wipe off the excess ionic liquid on the outer surface of the membrane with blotting paper, and weigh to obtain 50% loading ...

Embodiment 3

[0027] Embodiment 3: the method for simultaneous denitration and defluorination of this composite absorbent is as follows:

[0028] 1. Preparation of hydrophobic ionic liquid membrane: the organic membrane body is a polyvinylidene fluoride membrane, and the hydrophobic ionic liquid is [RMIM][TCM] (the ionic liquid [RMIM][TCM] in the present invention is prepared by referring to the following literature method. Obtained: Tzialla O , Labropoulos A , Panou A , et al. Phase behavior and permeability of Alkyl-Methyl-Imidazolium Tricyanomethanide ionic liquids supported in nanoporousmembranes[J]. Separation and Purification Technology, 2014, 135:22–34.), will The bulk polyvinylidene fluoride film was dried and weighed, the mass of the film body was 16 g, and the film thickness was 400 μm; the dried polyvinylidene fluoride film was immersed in the hydrophobic ionic liquid [RMIM] [TCM], and allowed to stand. 7h, gently wipe off the excess ionic liquid on the outer surface of the membr...

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Abstract

The invention discloses a method for synchronously defluorinating and denitrifying by using a composite absorbent, which is characterized in that the composite absorbent consisting of a hydrophobic ionic liquid membrane and an alkaline aqueous solution is used for treating tail gas containing fluorine and nitrate to realize synchronous purification and selective separation of NO and HF; wherein the hydrophobic ionic liquid membrane is prepared by immersing a block-shaped dry membrane body into hydrophobic ionic liquid, standing, carrying out solid-liquid separation, drying and crushing; compared with the prior art, the composite absorbent provided by the invention has the advantages of simple synthesis, small solvent loss, large absorption capacity, good absorption effect and the like, the ionic liquid membrane has relatively strong permeation selectivity on NO, and water in the composite absorbent has a relatively high absorption effect on HF, so that NO and HF can be purified at the same time, and the two gases can be separated.

Description

technical field [0001] The invention relates to a method for synchronous defluorination and denitration with a composite absorbent, belonging to the fields of environmental protection and gas purification. Background technique [0002] Atmosphere, as an environmental element for human survival, has become increasingly serious environmental pollution with industrial development and social progress, which seems to have posed a severe challenge to human survival and development. [0003] my country is rich in phosphate rock resources, with reserves ranking second in the world, and an average of 2% to 4% of fluorine resources associated with it. Phosphate in phosphate rock can be recycled through some special treatment methods, and can be processed into phosphate fertilizers and phosphate-containing feed products. Phosphoric acid in the world is mainly produced by wet process. The hydrochloric acid method, the sulfuric acid method and the nitric acid method are the main method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22
CPCB01D53/229B01D2257/404B01D2257/2047
Inventor 瞿广飞王芳袁永恒李志顺成杨聪庆李自赢季炜李军燕
Owner KUNMING UNIV OF SCI & TECH
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