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Method for preparing tetrakis(hydroxymethyl)phosphonium chloride from phosphine generated in sodium hypophosphite production

A technology of tetrahydroxymethyl phosphorus chloride and sodium hypophosphite, which is applied in hypophosphorous acid, chemical instruments and methods, phosphorus oxyacid, etc., can solve problems such as unqualified products, achieve low foaming, and solve pollution problems. Effect

Active Publication Date: 2008-03-19
江苏和纯化学工业有限公司
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AI Technical Summary

Problems solved by technology

The 50% hypophosphorous acid obtained by this method contains about 5% phosphorous acid, and the product is unqualified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After 5 minutes of feeding into the sodium hypophosphite reaction kettle, 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: 4.05:1 to form an aqueous solution;

[0016] 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 synthesis is carried out at a temperature of 50°C. Obtain an aqueous solution of tetrakis hydroxymethyl phosphorus chloride;

[0017] The reaction formula is as follows:

[0018] 4 HCHO+HCL+PH3=(HOCH2)4PCL

Embodiment 2

[0020] After 5 minutes of feeding into the sodium hypophosphite reaction kettle, 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: 4.15:1 to form an aqueous solution;

[0021] 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 synthesis is carried out at a temperature of 40°C. An aqueous solution of tetrakisphosphonium sulfate was prepared.

[0022] The reaction formula is as follows:

[0023] 4 HCHO+HCL+PH3=(HOCH2)4PCL

[0024] Tetrahydroxymethylphosphonium chloride biodegradable fungicide. Moreover, this product has high added value, and the profit is more than 50%. The phosphine is completely ...

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Abstract

The present invention relates to a method which uses the phosphine generated in the process of producing sodium hypophosphite to prepare tetrakis (hydroxymethyl) phosphonium chloride. From the waste gas generated in the process of producing the sodium hypophosphite, the phosphine is collected and stored; aqueous solution is prepared with formaldehyde and hydrochloric acid according to the molar ratio of 4.05 to 4.15:1; the aqueous solution is pumped into an absorption column by an erosion-resistant pump and is sprayed down from the top of the column, the phosphine gas in a gas vessel is pumped into the absorption column by a gas pump, a synthesis reaction is carried out under the condition of temperature between 40 DEG C and 50 DEG C, the reaction formula is 4HCHO plus HCL plus PH3=(HOCH2)4PCL, and finally, the tetrakis (hydroxymethyl) phosphonium chloride is prepared. The prepared tetrakis (hydroxymethyl) phosphonium chloride is a quaternary alkylphosphonium salt bactericidal algicide, which does not pollute environment. The formaldehyde and the hydrochloric acid can thoroughly absorb the phosphine, thus realizing zero emission of toxic gas. The present invention resolves the problem of environmental pollution caused by the waste gas generated in the process of producing sodium hypophosphite.

Description

technical field [0001] The invention relates to a method for preparing tetrakis hydroxymethyl phosphorus chloride by using phosphine in waste gas produced in the process of producing sodium hypophosphite, and belongs to the technical field of tetrakis hydroxymethyl phosphorus sulfate technology. 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 pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/535C01B25/165
Inventor 冯振华朱康洋
Owner 江苏和纯化学工业有限公司
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