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Method for producing sodium dihydrogen phosphate and sodium chloride by purifying crude product sodium pyrophosphate

A technology of sodium dihydrogen phosphate and sodium pyrophosphate, applied in chemical instruments and methods, phosphorus compounds, alkali metal chlorides, etc., can solve the problems of slow dissolution of crude sodium pyrophosphate, small device processing capacity, and high viscosity of the solution , to achieve the effect of reducing the amount of wastewater produced, the amount of treatment is large, and the cost of treatment is high

Active Publication Date: 2019-03-12
HUBEI TAISHENG CHEM
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  • Application Information

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Problems solved by technology

CNIO6809811A is a method for preparing sodium pyrophosphate using crude sodium pyrophosphate and CN106882781A is a method for directly refining and extracting sodium pyrophosphate during the purification of crude sodium pyrophosphate to produce sodium pyrophosphate products, which also exists in the process of processing crude sodium pyrophosphate Problems of slow dissolution of crude sodium pyrophosphate, high viscosity of solution, small device processing capacity and high content of sodium chloride in sodium pyrophosphate products

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  • Method for producing sodium dihydrogen phosphate and sodium chloride by purifying crude product sodium pyrophosphate
  • Method for producing sodium dihydrogen phosphate and sodium chloride by purifying crude product sodium pyrophosphate

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Embodiment 1

[0045] A method for purifying crude product sodium pyrophosphate to produce sodium dihydrogen phosphate and sodium chloride

[0046] In this process scheme, the content of sodium dihydrogen phosphate in the mother liquor after sodium dihydrogen phosphate crystallization is high, and the consumption of phosphoric acid is relatively large, but because the hydration amount of sodium dihydrogen phosphate is small and the mother liquor is recycled, the overall cost is also advantageous. This process scheme is especially suitable for enterprises with supporting devices of pentasodium phosphate and hexabias.

[0047] 1. Ingredients: At the initial start-up, mix the crude sodium pyrophosphate and water in the hydrolysis tank (hydrolysis tank) according to the mass ratio of 1:1, and add phosphoric acid dropwise to control the pH value of the mixed material at 3.5.

[0048] In the continuous operation process, the crude product sodium pyrophosphate and mechanically applied process water...

Embodiment 2

[0065] A device for purifying crude sodium pyrophosphate to produce sodium pyrophosphate and sodium chloride. The bottom of the hydrolysis kettle 1 is connected to the filter A2; the filter device A2 is connected to the heat exchanger 4, and the heat exchanger 4 is connected to the mixer 6, and the mixer 6 is connected with filter C 7, filter C 7 is connected with crystallization kettle 8, crystallization kettle 8 is connected with filter B 9, filter B 9 is connected with material washing device B 10, and material washing device B 10 is connected to sodium pyrophosphate Deep refining device 11.

[0066] Filter B 9 and material washing device B 10 are connected to heat exchanger 4 through pipelines respectively, and heat exchanger 4 is connected to heater 12 through connecting water storage tank 5 again, and heater 12 is connected to hydrolysis kettle 1.

[0067] Filter A 2 bottom is connected with material washing device A 3 through pipeline, and material washing device A 3 is...

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Abstract

The invention discloses a method for producing sodium dihydrogen phosphate and sodium chloride products by purifying by-product crude product sodium pyrophosphate of phosphorus-containing salt-containing wastewater such as glyphosate mother liquor. The method is characterized in that an oxidative assistant is utilized to improve dispersity of a crude product sodium pyrophosphate mixed solution, and a special use method of process water is utilized, so that viscosity of slurry is improved, and crystallization effect is improved. Solubility difference of sodium pyrophosphate and a hydrolysate thereof and sodium chloride in the crude product sodium pyrophosphate under different temperatures, different pH value conditions and the action of different auxiliaries is utilized to extract sodium orthophosphate and sodium chloride. In the production process, dissolving speed is high; product quality is excellent; wastewater amount is small; environment-friendly treatment cost is greatly reduced;and reaction advantages, environment-friendly advantages, quality advantages and cost advantages are achieved.

Description

technical field [0001] The invention belongs to the technical field of waste treatment and production, and specifically relates to a method for refining crude sodium pyrophosphate obtained by incinerating or high-temperature oxidation of high-chloride phosphorus-containing waste water such as glyphosate mother liquor, and is especially suitable for glycine method or IDA method glyphosate Purification of crude sodium pyrophosphate obtained from incineration of phosphine mother liquor or high temperature oxidation. Background technique [0002] The treatment of glyphosate mother liquor is an industrial problem. Regardless of whether glyphosate is produced by the glycine method or the IDA method, the mother liquor has the characteristics of high COD, high TP, high salt, complex components, and difficult to degrade. The treatment is very difficult and costly . At present, the mainstream mother liquor treatment process is to use oxidation method to degrade mother liquor and reco...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01D3/04
CPCC01B25/30C01D3/04
Inventor 李晓晴胡波
Owner HUBEI TAISHENG CHEM
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