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Processing method of exhaust gas in sodium hypophosphite production course

A sodium hypophosphite, production process technology, applied in the field of three wastes treatment process, can solve problems such as environmental pollution

Active Publication Date: 2008-07-23
江苏和纯化学工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As well as defects such as pollution to the environment, an improved method for waste gas treatment in the production process of sodium hypophosphite is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Waste gas treatment method: 5 minutes after the sodium hypophosphite reaction kettle is fed, phosphine gas is continuously generated in the kettle, and the phosphine gas is directly transported to the gas storage tank for collection by using the pressure of the gas in the kettle. The molar ratio of formaldehyde and sulfuric acid is: 8.1-8.2:1 to form an aqueous solution. The aqueous solution is pumped into the absorption tower with a corrosion-resistant pump, sprayed downward from the top of the tower, and the phosphine gas in the gas tank is sent into the absorption tower with a gas pump, and the reaction is carried out at a temperature of 40-50°C Synthesis, the system four hydroxymethyl phosphorus sulfate aqueous solution.

[0017] Tetrahydroxymethylphosphorus sulfate (THPS) is a new environment-friendly bactericide and algicide, which can biodegrade itself without causing any pollution to the environment. It is an ideal substitute product for many fungicides at pres...

Embodiment 2

[0019] Waste gas treatment method: 5 minutes after the sodium hypophosphite reaction kettle is fed, phosphine gas is continuously generated in the kettle, and the phosphine gas is directly transported to the gas storage tank for collection by using the pressure of the gas in the kettle. The molar ratio of formaldehyde and hydrochloric acid is: 4.05~4.15:1 to form an aqueous solution. The aqueous solution is pumped into the absorption tower with a corrosion-resistant pump, sprayed downward from the top of the tower, and the phosphine gas in the gas tank is sent into the absorption tower with a gas pump, and the reaction is carried out at a temperature of 40-50°C Synthesis, the system four hydroxymethyl phosphorus chloride aqueous solution.

[0020] Tetrahydroxymethylphosphorus chloride (THPC) and urea are synthesized at a molar ratio of 1.8 to 1.9:1 at a temperature of 60 to 70°C to produce a permanent flame retardant for cotton fabrics: tetrahydroxymethylphosphorus chloride -...

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Abstract

The invention relates to an exhaust gas disposal method in the sodium hypophosphite preparation process. The technique includes the following steps: phosphine is collected and stored; formaldehyde, vitriol or hydrochloric acid are prepared into water solutions according to molar ratio of 8.1 to 8.2:1; the water solution is pumped into an absorbing tower by an anti-corrosion pump and then is sprayed downwards from the tower top, and the phosphine in a gas tank is filled into the absorbing tower by a gas pump, and the reaction compounding happens under the temperature of 40 - 50 DEG C to obtain tetramethylol phosphonium sulfate or tetramethylol phosphorus chloride water solution. The invention has the advantages that the prepared tetramethylol phosphonium sulfate (THPS) is phosphonium actericide bactericidal algicide and generates no pollution to environment; the prepared tetramethylol phosphorus chloride (THPC) can be synthesized with urea to generate THPC-Urea which can be used for pure cotton or polyester cotton and other fabrics as permanent flame retardant, and the phosphine can be thoroughly absorbed by formaldehyde, vitriol or hydrochloric acid so as to realize a zero emission of poison gases.

Description

technical field [0001] The invention relates to a method for treating waste gas generated in the production process of sodium hypophosphite, and belongs to the technical field of three waste treatment processes. Background technique [0002] Sodium Hypophosphite, also known as Sodium Hypophosphite: SHPP / HYPO for short. Molecular formula: NaH 2 PO 2 ·H 2 O, molecular weight: 105.99. The product emits a large amount of waste water, waste gas, waste residue and other pollutants during the production process. The main component of the exhaust gas is phosphine, and the existing treatment methods are: [0003] 1: Collect and store phosphine, make hydrogen peroxide into a certain concentration of aqueous solution, under certain temperature conditions, use hydrogen peroxide solution to absorb phosphine gas, react to generate hypophosphorous acid, after absorption saturation, in negative pressure, vacuum Conditions, concentrated into 50% hypophosphorous acid. The 50% hypophosp...

Claims

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Application Information

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IPC IPC(8): B01D53/46B01D53/78C01B25/39
Inventor 冯振华朱康洋
Owner 江苏和纯化学工业有限公司
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