New technique for producing disodium phosphate

A new technology of sodium tripolyphosphate, applied in the direction of phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of high cost and hidden danger of pollution, and achieve the effect of low cost and pollution reduction.

Inactive Publication Date: 2004-10-27
张立民 +1
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  • Summary
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Problems solved by technology

The disadvantage is that the raw materials used are all ≥85% phosphoric acid and ≥98% soda ash. For every ton of sodium tripolyphosphate produced, the unit cost of raw materials is about 3300

Method used

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  • New technique for producing disodium phosphate

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Experimental program
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Embodiment Construction

[0016] First add 1 ton of waste phosphoric acid ≥ 25% (weight) in the neutralization kettle (1), then open the steam valve for heating, start the mixer and slowly add 280 kilograms of soda ash ≥ 98% (weight), when the temperature rises to ≥ When the temperature is 82°C and the pH value is 8±1, add ≥30% (weight) liquid caustic soda until the pH value is 12±1, the specific gravity is 1.2 and the temperature is >90°C, continue to stir for 5-20 minutes, and the liquid in the kettle will settle After 1 hour, send the settled liquid in the kettle to the neutralization kettle (2), [the upper suspension remains in the neutralization kettle (1), clean the neutralization kettle (1) every few times], and transfer to the neutralization kettle (1) Add 1 ton of ≥ 15% (weight) soda ash waste into the kettle (2), add 640 kilograms of phosphoric acid ≥ 85% (weight) at the same time, then add soda ash to adjust the neutralization degree K value (ratio of sodium / phosphorus) to 3.0 ±0.02 neutrali...

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Abstract

A process for preparing sodium tripolyphosphate includes adding waste phosphoric acid to neutralizing reactor, steam heating while adding sodium carbonate under stirring until 82 deg.C and pH=8+/-1, adding liquid sodium hydroxide until 90 deg.C and pH=12+/-1, stirring for 5-20 min, depositing, transferring it to another neutralizing reactor, adding waste sodium carbonate, adding phosphoric acid and sodium hydroxide while regulating K=3.0+/-0.1, adding ammonium nitrate, filtering and dewatering polymerization.

Description

technical field [0001] The invention relates to a process for producing sodium tripolyphosphate. Background technique [0002] The main raw material and specification that prior art produces sodium tripolyphosphate use are phosphoric acid (H 3 PO 4 ≥85%) and soda ash (Na 2 CO 3 ≥98%), the reaction principle is neutralization of phosphoric acid and soda ash to generate disodium hydrogen phosphate and sodium dihydrogen phosphate, the chemical reaction formula is [0003] <chemistry num="001"> <chem file="200310105368_cml001.xml" / > < / chemistry> [0004] Gained sodium phosphate is dried and polymerized to generate pentasodium phosphate, and the chemical reaction formula is [0005] <chemistry num="002"> <chem file="200310105368_cml002.xml" / > < / chemistry> [0006] The production process usually adopts the converter one-step method: first add about 1,200 kg of clear water to the neutralization kettle, and then pass in steam. When t...

Claims

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Application Information

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IPC IPC(8): C01B25/30
Inventor 张立民韩立群
Owner 张立民
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