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Method for purifying crude sodium pyrophosphate to produce disodium hydrogen phosphate and sodium chloride

A technology of disodium hydrogen 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, low device processing capacity and high sodium chloride content , to achieve the effect of reducing the amount of waste water produced, treating a large amount of water, and having a high treatment cost.

Active Publication Date: 2019-03-01
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CNIO6809811A a kind of method that uses crude product sodium pyrophosphate to prepare sodium pyrophosphate and CN106882781A a kind of method that crude product sodium pyrophosphate purifies and produces sodium pyrophosphate product and directly refines and extracts sodium pyrophosphate, also exists in the process of crude product 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

Method used

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  • Method for purifying crude sodium pyrophosphate to produce disodium hydrogen phosphate and sodium chloride
  • Method for purifying crude sodium pyrophosphate to produce disodium hydrogen phosphate and sodium chloride

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Embodiment 1

[0035] A method for purifying crude product sodium pyrophosphate to produce disodium hydrogen phosphate and sodium chloride, comprising the steps:

[0036] 1. Ingredients: During 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 within the range of 7.0.

[0037] During continuous operation, mix the crude sodium pyrophosphate and mechanically applied process water (filtrate B2, washing solution A and other process water described in the implementation steps) in the hydrolysis kettle (hydrolysis tank) according to the mass ratio of 1:1, and add dropwise Phosphoric acid controls the pH value of the mixed material in the range of 7.0.

[0038] After the crude product sodium pyrophosphate is partially dissolved, add an oxidizing auxiliary agent to carry out oxidation and sol reaction in the hydrolysis kettle (hy...

Embodiment 2

[0056] A device for purifying crude sodium pyrophosphate to produce sodium pyrophosphate and sodium chloride, the bottom of hydrolysis kettle 1 is connected to filter A2; filter device A2 is connected to heat exchanger 4, heat exchanger 4 is connected to mixer 6, and mixed Device 6 is connected to filter C 7, filter C 7 is connected to crystallization kettle 8, crystallization kettle 8 is connected to filter B 9, filter B 9 is connected to material washing device B 10, and material washing device B 10 is connected to pyrophosphoric acid Sodium deep refining device 11.

[0057] The filter B 9 and the material washing device B 10 are respectively connected to the heat exchanger 4 through pipelines, and the heat exchanger 4 is connected to the heater 12 through the water storage tank 5, and the heater 12 is connected to the hydrolysis kettle 1.

[0058] The bottom of the filter A 2 is connected to the material washing device A 3 through a pipeline, and the material washing device...

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Abstract

The invention discloses a method for purifying a by-product crude sodium pyrophosphate of wastewater containing phosphorus and salt like a glyphosate mother solution to produce disodium hydrogen phosphate and sodium chloride products. An oxidizing aid is utilized to improve the dispersibility of a crude sodium pyrophosphate mixed solution, and a special use method of process water is adopted to improve the viscosity of slurry and improve the crystallization effect. The sodium orthophosphate and the sodium chloride are extracted by utilizing the difference in solubility of the sodium pyrophosphate, a hydrolysate and the sodium chloride in the crude sodium pyrophosphate under the effect of different temperatures, pH conditions and aids. The production process is high in dissolution speed. The product quality is excellent, the wastewater amount is small, the environmental protection treatment cost is greatly reduced, and the advantages of reaction, environmental protection, quality and cost 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 a difficult problem in the industry. 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 l...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01D3/04
CPCC01B25/30C01D3/04
Inventor 田义群杨爱兵曹杰胡波黄明华许长泽程飞黄丹丹
Owner HUBEI TAISHENG CHEM
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