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Perfluoroisobutyronitrile/carbon dioxide recovered insulating gas adsorption, purification and recycling method

A technology of perfluoroisobutyronitrile and carbon dioxide, applied in chemical instruments and methods, alkali metal oxides/hydroxides, separation methods, etc., can solve problems such as reducing recycling costs

Pending Publication Date: 2021-12-28
CHEM & CHEM ENG GUANGDONG LAB +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a simple and effective treatment method aimed at solving the problem of reusing the perfluoroisobutyronitrile / carbon dioxide in the insulating gas after discharge or thermal decomposition to remove impurities. The method of the present invention can efficiently absorb and recover the insulating gas For organic or inorganic impurities, it is not necessary to separate perfluoroisobutyronitrile and carbon dioxide separately, but only to make up the gas after adsorption to the required perfluoroisobutyronitrile / carbon dioxide ratio. The method of the present invention is simple and practical, greatly reducing the reuse cost

Method used

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  • Perfluoroisobutyronitrile/carbon dioxide recovered insulating gas adsorption, purification and recycling method
  • Perfluoroisobutyronitrile/carbon dioxide recovered insulating gas adsorption, purification and recycling method
  • Perfluoroisobutyronitrile/carbon dioxide recovered insulating gas adsorption, purification and recycling method

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of adsorbent: Weigh a certain amount of columnar activated carbon particles (diameter 2-3mm) as a carrier, mix with metal salt solution at a solid-liquid ratio of 1 / 3, wherein Cu(NO 3 ) 2 、KNO 3 , Ni(NO 3 ) 2 The concentrations are 0.1mol / L, 0.08mol / L, and 0.05mol / L, respectively, and stand at room temperature 25°C for 8h. Filtered and washed with deionized water until Cu-free 2+ Detected, transferred to 120 ℃ oven to dry for 12h. The dried adsorbent was filled in a tubular electric furnace, fired with nitrogen gas at 250°C for 12 hours, and cooled to room temperature for use.

[0040] The application of the adsorbent: put the treated adsorbent into the gas-solid phase adsorption device, the filling volume is 200ml, at 25°C, 0.1MPa (absolute pressure), the recovery gas of perfluoroisobutyronitrile is introduced, and the space velocity is 500h -1 , the adsorption product was quantitatively analyzed for impurity content by GC-PDD, and the results are sho...

Embodiment 2

[0042] Preparation of adsorbent: Take a certain amount of 10X molecular sieve (diameter 3mm) as a carrier, mix it with metal salt solution at a solid-to-liquid ratio of 1 / 5, wherein Zn(NO 3 ) 2 、NaNO 3 , La(NO 3 ) 3 The concentrations are 0.15mol / L, 0.1mol / L, and 0.08mol / L, respectively, and stand at room temperature 45°C for 8h. Filtered and washed with deionized water to be free of Zn 2+ Detected, transferred to 150 ℃ oven to dry for 12h. The dried adsorbent was filled in a tubular electric furnace, fired with nitrogen gas at 350°C for 12 hours, and cooled to room temperature for use.

[0043] The application of the adsorbent: put the treated adsorbent into the gas-solid phase adsorption device, the filling volume is 200ml, at 25°C, 0.1MPa (absolute pressure), the recovery gas of perfluoroisobutyronitrile is introduced, and the space velocity is 500h -1 , the product after adsorption was quantitatively analyzed for impurity content by GC-PDD, and the results are shown ...

Embodiment 3

[0045] Preparation of adsorbent: Weigh a certain amount of SBA-15 molecular sieve raw powder as a carrier, and mix it with a carbonate mixture of metal K, Mg, and Ce in a mass ratio of 1 / 0.5, where K 2 CO 3 / MgCO 3 / C 2 (CO 3 ) 3 =1 / 0.5 / 0.5 (mass ratio). A small amount of water was added as a binder, and a strip-shaped adsorbent with a diameter of 3 mm was prepared by using a extruder, and dried in an oven at 120°C for 8 hours. The dried adsorbent was packed in a tubular electric furnace, fired with nitrogen gas at 350 °C for 12 h, and cooled to room temperature for use.

[0046] The application of the adsorbent: put the treated adsorbent into the gas-solid phase adsorption device, the filling volume is 200ml, at 25°C, 0.1MPa (absolute pressure), the recovery gas of perfluoroisobutyronitrile is introduced, and the space velocity is 500h -1 , the product after adsorption was quantitatively analyzed for impurity content by GC-PDD, and the results are shown in Table 2. The...

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Abstract

The invention relates to a perfluoroisobutyronitrile / carbon dioxide recovered insulating gas adsorption, purification and recycling method, which comprises the following steps: (1) carrying out adsorption and purification: introducing recovered insulating gas into a fixed bed adsorption column filled with an adsorbent, and removing most organic impurities, water and HF; and (2) reproportioning the gas: measuring the volume ratio of the perfluoroisobutyronitrile / carbon dioxide in the adsorbed mixed gas, and directly recycling after reproportioning the volume ratio. The adsorbent adopted by the invention can effectively adsorb impurities in the perfluoroisobutyronitrile recovery gas, the adsorption rate of organic impurities reaches 99.1%, and meanwhile, the adsorbent also has a very good removal effect on moisture and HF. The recovered insulating gas subjected to primary adsorption can meet the lowest impurity requirement, the perfluoroisobutyronitrile and carbon dioxide do not need to be purified and blended respectively, only the adsorbed gas needs to be supplemented to the required perfluoroisobutyronitrile / carbon dioxide ratio, the method is simple and practical, and the recycling cost is greatly reduced.

Description

technical field [0001] The invention relates to a gas adsorption purification recycling method, in particular to a perfluoroisobutyronitrile / carbon dioxide adsorption purification recycling method for insulating gas recovery. Background technique [0002] Perfluoroisobutyronitrile is a new type of environmentally friendly insulating gas, which can be used to replace sulfur hexafluoride in electrical equipment such as GIS and GIL. Perfluoroisobutyronitrile will decompose in electrical equipment due to discharge and overheating failures, producing corrosive decomposition products, some of which are highly toxic. There have been many reports on the discharge decomposition and thermal decomposition products of perfluoroisobutyronitrile and its mixed gas (generally, the mixed insulating gas is obtained by using perfluoroisobutyronitrile and carbon dioxide in a molar ratio of 1:4). [0003] Document "Decomposition properties of C 4 f 7 N / N 2 gas mixture: An environmentally fr...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01J20/04B01J20/28B01J20/30C07C253/34C07C255/10
CPCB01D53/04B01D53/263B01J20/04B01J20/28011C07C253/34B01D2257/80C07C255/10Y02P20/155Y02P20/151
Inventor 董利郭勤庆飞要刘冬鹏权恒道
Owner CHEM & CHEM ENG GUANGDONG LAB
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