A method for adsorbing and separating sulfuric acid-containing gas

An adsorption separation and sulfuric acid technology, applied in the field of chemical engineering, can solve the problems of low pore volume and limited adsorption capacity, and achieve the effects of low cost, high separation selectivity and excellent adsorption capacity.

Active Publication Date: 2018-08-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US2015 / 0047505 A1 relates to a method for SO 2 A metal-organic framework material for gas separation and a preparation method thereof, the metal-organic framework material is made of Al(III), Cr(III), Sb(III), In(III), Ga(III), and Fe(III) At least one metal ion of at least one tetracarboxylic acid-containing organic ligand is prepared by reacting, due to the presence of hydroxyl groups on SO 2 Shows good adsorption performance, due to the low pore volume, which limits the improvement of its adsorption capacity

Method used

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  • A method for adsorbing and separating sulfuric acid-containing gas
  • A method for adsorbing and separating sulfuric acid-containing gas
  • A method for adsorbing and separating sulfuric acid-containing gas

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Weigh 46.44 mg of 4,4'-dipyridylacetylene (organic ligand L1) in 4 ml of methanol, weigh 89 mg of Cu(BF 4 ) 2 ·xH 2 O and 45.96 mg (NH 4 ) 2 SiF 6 (Inorganic anionic ligand L2) was dissolved in 4 ml of water, the above two solutions were mixed with stirring, and then heated to 60-100° C. to react for 12-36 hours. The obtained product SIFSIX-2-Cu-i (inorganic anion ligand is SiF 6 - ) was filtered, washed with methanol, and then activated. The adsorbent was packed into the adsorption column (inner diameter 4.6mm, length 50mm), at room temperature 25 ℃, 2000ppm SO 2 , 99.8%N 2 The mixed gas was passed into the adsorption column at 20ml / min, and the nitrogen with extremely low sulfur dioxide content (2 and 99.8%N 2 The breakthrough curve of the mixed gas on SIFSIX-2-Cu-i is as follows figure 1 shown.

Embodiment 2

[0044] Example 1 to obtain an adsorption column (inner diameter 4.6 mm, length 50 mm), at room temperature of 35 ° C, 10% SO 2 , 90% air mixture was passed into the adsorption column at 20ml / min, and the nitrogen with extremely low sulfur dioxide content (<10ppm) was obtained in the first 140min, and the adsorption was stopped. At 80°C, the sulfur dioxide gas was desorbed by vacuum.

Embodiment 3

[0046] 0.35 g of 4,4'-bipyridine (organic ligand L1) was weighed and dissolved in ethylene glycol. Weigh 0.28 g of Cu (BF 4 ) 2 ·xH 2 O (metal ion M1) and 0.199 g (NH 4 ) 2 SiF 6 (inorganic anionic ligand L2) was dissolved in deionized water and added to a solution of 4,4'-bipyridine glycol. The reaction was stirred at below 100°C for 2-8 hours. The purple powder product SIFSIX-1-Cu (the inorganic anion ligand is SiF 6 - ) filtered and then activated. The adsorbent was packed into the adsorption column (inner diameter 4.6mm, length 50mm), at room temperature 25 ℃, 2000ppm SO 2 , 99.8% methane gas mixture was passed into the adsorption column at 20ml / min, and the nitrogen with extremely low sulfur dioxide content (2 and 99.8%N 2 The penetration curve on SIFSIX-1-Cu is as figure 2 shown.

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Abstract

The invention discloses a method for adsorbing and separating a sulfur-containing acid gas. The method comprises the following step: by taking an anion-containing metal-organic frame material as an adsorbent, selectively adsorbing the sulfur-containing acid gas in a gas mixture so as to obtain a purified gas, wherein the sulfur-containing acid gas comprises one or more of sulfur dioxide, sulfur trioxide and hydrogen sulfide. The anion-containing metal-organic frame material used in the method has a great number of regularly arranged inorganic anion functional groups with negative electricity, the size of the aperture of an MOF material can be adjusted in a controllable manner by adjusting the size of organic ligand, or a three-dimensional channel spatial structure can be adjusted through an interpenetration structure. The inorganic anions with negative electricity can form an electrostatic environment in a limited space of the MOF material, sulfur-containing acid gas molecules can be selectively adsorbed by virtue of an electrostatic effect of the electrostatic environment and lacked electron atoms of the acid gas, and thus high-capacity high-selectivity separation of the sulfur-containing acid gas can be achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, in particular to a method for purifying sulfuric acid gas in gas. Background technique [0002] In recent years, the emission of sulfuric acid gases such as sulfur dioxide, sulfur trioxide and hydrogen sulfide in fossil fuels has seriously affected the environment. Therefore, the capture and separation of sulfuric acid gas is very important for the rational use of the environment and energy. At the same time, in industrial applications, a trace amount of sulfuric acid gas in the reaction raw material gas will poison the catalyst, and the removal of trace amount of sulfuric acid gas is also very important. [0003] To solve this problem, in the past few decades, researchers have prepared a variety of new materials (activated carbon, polymers, molecular sieves, etc.) to trap acid gases. However, due to the restriction of the nature of these traditional adsorption materials, the adsor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01J20/22C10L3/10
CPCB01D53/02B01D2253/204B01D2257/302B01D2257/304B01D2258/01B01D2258/0283B01J20/223C10L3/10
Inventor 邢华斌崔希利杨启炜任其龙鲍宗必
Owner ZHEJIANG UNIV
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