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Method for purifying hydrogen phosphide gas in unorganized emission environment and recycling phosphoric acid

A fugitive emission, phosphine technology, applied in chemical instruments and methods, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of easy poisoning, lack of phosphine gas purification technology, limited adsorption capacity, etc.

Inactive Publication Date: 2018-06-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some other methods of purifying phosphine using catalysts and adsorbents prepared from metals such as copper, iron, nickel, and cobalt, certain applicable conditions are required, and there are problems such as limited adsorption capacity and easy poisoning.
[0004] At present, the purification technology of phosphine gas in the unorganized emission environment is lacking, and several existing technologies require multi-step and multi-process treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use the exhaust fan to pump the fumigant vapor from a warehouse to the corona discharge plasma processor, in which the content of phosphine is 40-85mg / m 3 , the induced air flow rate is 1m 3 / s. The corona discharge plasma processor adopts the wire tube corona discharge method, which is composed of 100 groups of single wire tube type processing units with a length of 20cm. The discharge pole is cylindrical, with a diameter of 1mm, and the distance between the discharge electrode and the plate is 20mm, and the surface of the electrode and plate is coated with an anti-phosphoric acid corrosion coating. A high-voltage direct current is loaded on the discharge electrode and the pole plate, and the voltage intensity of the load is 16kV. After being treated by a corona discharge plasma processor, the concentration of phosphine at the outlet of the processor is less than 0.1mg / m 3 .

Embodiment 2

[0023] The ambient air containing phosphine in a yellow phosphorus plant is pumped to the corona discharge plasma processor through the exhaust fan, and the content of phosphine is 20-40mg / m3 3 , the induced air flow rate is 5m 3 / s. The corona discharge plasma processor adopts the corona discharge method of the wire layout, which is composed of multiple sets of wire plate discharge components, and the effective area is 60m 2 , The discharge pole is cylindrical, with a diameter of 2mm, the distance between the discharge electrode and the pole plate is 15mm, the distance between the pole line and the pole line is 35mm, and the surface of the electrode and the pole plate is coated with an anti-phosphoric acid corrosion coating. A high-voltage direct current is loaded on the discharge electrode and the pole plate, and the voltage strength of the load is 10kV. After being treated by a corona discharge plasma processor, the concentration of phosphine at the outlet of the processo...

Embodiment 3

[0025] The air containing phosphine is pumped to the corona discharge plasma processor through the exhaust fan, and the content of phosphine is 100-150mg / m3 3 , the induced air flow rate is 3m 3 / s. The corona discharge plasma processor adopts the wire-tube corona discharge method, which consists of 150 groups of 30cm-long single-line-tube processing units arranged side by side, in which the discharge is extremely cylindrical, with a diameter of 3mm, and the distance between the discharge electrode and the plate 30mm, and the surface of the electrode and plate is coated with an anti-phosphoric acid corrosion coating. A high-voltage direct current is loaded on the discharge electrode and the pole plate, and the voltage intensity of the load is 18kV. After being treated by a corona discharge plasma processor, the concentration of phosphine at the outlet of the processor is less than 0.2mg / m 3 .

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PUM

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Abstract

The invention discloses a method for purifying hydrogen phosphide gas in unorganized emission environment and recycling phosphoric acid. The method is characterized in that the gas containing hydrogenphosphide is sent into a corona discharge plasma treatment device, high-voltage direct current is loaded on a discharge electrode and an electrode plate, the hydrogen phosphide molecules and oxygen molecules are dissociated to generate active particles under the actions of electric field and high-speed electrons, the hydrogen phosphide molecules, the oxygen molecules and the active particles further react with each other to generate the phosphoric acid, and the phosphoric acid is enriched onto the electrode plate. The removal rate of the hydrogen phosphide treated by the method is higher than99.9%.

Description

technical field [0001] The invention relates to a purification technology of phosphine gas in an unorganized discharge environment, and belongs to the technical field of air pollution prevention and control. technical background [0002] Phosphine is a colorless, highly toxic gas. Inhalation of phosphine can affect the heart, respiratory system, kidneys, stomach, nervous system and liver. When the concentration in the air is 2-4 mg / m 3 Can be smelled; 9.7 mg / m 3 The above concentration can cause poisoning; 550-830 mg / m 3 Death occurred after exposure for 0.5-1.0 hours, 2798 mg / m 3 Can be fatal rapidly. For the sake of human health, countries have also stipulated the maximum allowable concentration of phosphine in the working environment. The EPA stipulates that the concentration of phosphine in the air of the working environment should be less than 0.3ppm. Phosphine is a fumigant widely used in the world because of its high efficacy, low lethal dose, no residue after f...

Claims

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Application Information

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IPC IPC(8): B01D53/74B01D53/46C01B25/18
CPCB01D53/46B01D53/74C01B25/18B01D2259/818B01D2258/02B01D2257/553
Inventor 马懿星郭清霞宁平王学谦张然郭梦雪刘冰冰孙鑫李凯
Owner KUNMING UNIV OF SCI & TECH