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Method for adsorbing and purifying sulfur hexafluoride

A sulfur hexafluoride and adsorbent technology, which is applied in the field of purification, can solve the problems of high energy consumption and difficulty in reaching the volume content of sulfur hexafluoride gas in the adsorption effect, and achieve the effect of improving the capacity

Active Publication Date: 2016-07-06
张玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purification method of sulfur hexafluoride gas in the prior art mainly uses rectification method, which consumes a lot of energy; or uses alkali metal or alkaline earth metal hydroxide, oxide, active aluminum, zeolite, etc. for adsorption, and the adsorption effect is difficult to achieve The level of sulfur hexafluoride gas volume content above 99.99%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1. Load operation:

[0019] In a 1000L reactor, react 100Kg of hydrotalcite and 1Kg of hydroxypropyl-β-cyclodextrin at 60°C for 15 hours, then let it rest for 40 hours, then add 10Kg of 1-butyl-3-methylimidazole hydroxide, 300Kg Ethanol, reacted at 60°C for 15h, then added 1Kg tetramethylguanidine lactate, 1Kg1-aminopropyl-3-methylimidazolium tetrafluoroborate, reacted at 60°C for 15h, separated the product, and dried dry to obtain the adsorbent.

[0020] Step 2. adsorption and purification of sulfur hexafluoride:

[0021] Under the conditions of 150°C and 0.5MPa, industrial-grade sulfur hexafluoride is adsorbed through a 500L chromatography column equipped with 100Kg of adsorbent at a flow rate of 4BV / h. The adsorbent after adsorption is desorbed with nitrogen, and the gas passes through Gas chromatography detection, the purity of sulfur hexafluoride is shown in Table 1, numbered M-1.

Embodiment 2

[0023] Step 1. Load operation:

[0024] In a 1000L reactor, react 100Kg of hydrotalcite and 0.5Kg of hydroxypropyl-β-cyclodextrin at 50°C for 10 hours, let it rest for 20 hours, then add 5Kg of 1-butyl-3-methylimidazole hydroxide, 200Kg ethanol, reacted at 40°C for 5h, then added 0.5Kg tetramethylguanidine lactate, 0.5Kg1-aminopropyl-3-methylimidazolium tetrafluoroborate, reacted at 40°C for 10h, separated The product is dried to obtain the adsorbent.

[0025] Step 2. Purification of nitrogen trifluoride by adsorption:

[0026] Under the conditions of 100°C and 0.2MPa, industrial grade sulfur hexafluoride is adsorbed in a 500L chromatographic column equipped with 100Kg of adsorbent at a flow rate of 1BV / h. The adsorbent after adsorption is desorbed with nitrogen, and the gas passes through Gas chromatography detection, the purity of sulfur hexafluoride is shown in Table 1, numbered M-2.

Embodiment 3

[0028] Step 1. Load operation:

[0029] In a 1000L reactor, react 100Kg of hydrotalcite and 2Kg of hydroxypropyl-β-cyclodextrin at 80°C for 24h, then let it rest for 60h, then add 15Kg of 1-butyl-3-methylimidazole hydroxide, 500Kg Ethanol, reacted at 80°C for 20h, then added 0.5Kg tetramethylguanidine lactate, 2Kg 1-aminopropyl-3-methylimidazolium tetrafluoroborate, reacted at 80°C for 10h, and separated the product, drying to obtain the adsorbent.

[0030] Step 2. Purification of nitrogen trifluoride by adsorption:

[0031] Under the conditions of 200°C and 1MPa, industrial grade sulfur hexafluoride is adsorbed in a 500L chromatographic column equipped with 100Kg of adsorbent, with a flow rate of 5BV / h. The adsorbent after adsorption is desorbed with nitrogen, and the gas passes through the gas phase after the nitrogen is removed. Chromatographic detection, the purity of sulfur hexafluoride is shown in Table 1, and the number is M-3.

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Abstract

The invention provides a method for adsorbing and purifying sulfur hexafluoride.The method comprises the steps that hydrotalcite and hydroxypropyl-beta-cyclodextrin are added to a reaction still, the temperature is raised to reaction temperature, and standing is carried out after reacting is finished; then hydroxide of 1-butyl-3-methylimidazole and ethanol are added, and the temperature is raised to reaction temperature; after reacting is finished, tetramethyl guanidine lactate and 1-amino propyl-3-methylimidazole tetrafluoroborate are added, and the temperature is raised to reaction temperature for reacting; the product is separated and dried to obtain the adsorbent; industrial-grade sulfur hexafluoride passes through a chromatographic column containing the adsorbent for adsorption, the adsorbent obtained after adsorption is subjected to desorption with nitrogen gas, then nitrogen gas is removed, and the high-purity sulfur hexafluoride product is obtained.

Description

technical field [0001] The invention relates to a purification method, in particular to a method for adsorbing and purifying sulfur hexafluoride. Background technique [0002] With the continuous development of high-voltage and large-capacity power grids in power systems and the acceleration of oil-free transformation of substations, gas combined electrical appliances with high insulation performance and arc extinguishing performance have emerged as the times require, and sulfur hexafluoride (SF6) gas is currently available The best gas arc extinguishing medium synthesized and widely used. Pure sulfur hexafluoride gas is a colorless, odorless and very stable chemical substance. It can resist the action of molten KOH or water vapor at 500°C. Its reaction with oxygen can only be achieved under the condition of electrification and platinum wire detonation. conduct. It is mainly used as a dielectric insulation medium in large power plants and also faces strong demand in semico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01J20/30B01J20/04B01J20/22C01B17/45
CPCY02P20/151B01D53/04B01D2253/25B01D2256/26B01J20/043B01J20/22C01B17/453C01P2006/80
Inventor 王琪宇王新
Owner 张玲
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