Method for adsorbing and separating sulfur-containing acid gas

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

Active Publication Date: 2016-08-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for adsorbing and separating sulfur-containing acid gas
  • Method for adsorbing and separating sulfur-containing acid gas
  • Method for adsorbing and separating sulfur-containing acid gas

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Weigh 46.44 mg of 4,4'-dipyridylacetylene (organic ligand L1) and dissolve it 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 anion ligand L2) was dissolved in 4ml of water, and the above two solutions were mixed under stirring, and then heated to 60-100° C. for 12-36 hours to react. The obtained product SIFSIX-2-Cu-i (the 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), and at room temperature 25°C, 2000ppm SO 2 , 99.8%N 2 The mixed gas is passed into the adsorption column at 20ml / min, and the nitrogen gas 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 obtains an adsorption column (inner diameter 4.6mm, length 50mm), and at a room temperature of 35°C, 10% SO 2 , 90% air mixed gas is passed into the adsorption column at 20ml / min, nitrogen with extremely low sulfur dioxide content (<10ppm) is obtained in the first 140min, and the adsorption is stopped. At 80°C, vacuumize and desorb sulfur dioxide gas.

Embodiment 3

[0046] Weigh 0.35 g of 4,4'-bipyridine (organic ligand L1) and dissolve it in ethylene glycol. Weigh 0.28 g 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 the 4,4'-bipyridine glycol solution. The reaction was stirred at less than 100°C for 2-8 hours. The purple powder product SIFSIX-1-Cu (the inorganic anion ligand is SiF 6 - ) filter and then activated. The adsorbent was packed into the adsorption column (inner diameter 4.6mm, length 50mm), at room temperature 25°C, 2000ppmSO 2 , 99.8% methane mixed gas is passed into the adsorption column at 20ml / min, nitrogen with extremely low sulfur dioxide content (2 and 99.8% N 2 The breakthrough 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 Applications(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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