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A kind of method using crude product sodium pyrophosphate to prepare sodium pyrophosphate

A technology of sodium pyrophosphate and crude products, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of agglomerated micro-waste, difficult-to-dissolve slag, and uneven reaction, so as to achieve easy production and save mother liquor Volume, solve the effect of filtering difficulties

Active Publication Date: 2019-06-14
ZHENJIANG JIANGNAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the crude sodium pyrophosphate is obtained by flame incineration of phosphorus-containing wastewater in a high-temperature furnace. Due to the high local temperature in the incineration process, the reaction is uneven, and it is easy to produce micro-waste slag with high hardness and agglomeration. This part of slag The material is difficult to dissolve, and the content of sodium pyrophosphate in the slag reaches 40-70wt%, which causes a waste of resources

Method used

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  • A kind of method using crude product sodium pyrophosphate to prepare sodium pyrophosphate
  • A kind of method using crude product sodium pyrophosphate to prepare sodium pyrophosphate
  • A kind of method using crude product sodium pyrophosphate to prepare sodium pyrophosphate

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Embodiment 1

[0036] A washing device for washing and beating of crude sodium pyrophosphate, comprising a stirring tank 1, a waste liquid storage tank 2 and a dissolving tank 3, the stirring tank is provided with a stirring blade 4, and a filter plate 5 is arranged below the stirring blade to filter The plate divides the stirring tank into a stirring cavity 6 and a suction filter cavity 7. The stirring tank is provided with a first feed port 8, a second feed port 9, a suction filter port 10 and a discharge port 11. The first feed port and the second feeding port is located at the top of the stirring tank and communicates with the stirring chamber, the suction filter port is located at the bottom of the stirring tank and communicates with the suction filtering chamber, and the discharge port is located between the first feeding port and the suction filtering port, It communicates with the stirring chamber; the suction filter port is connected with the third feed port of the waste liquid stora...

Embodiment 2

[0049] A method for preparing sodium pyrophosphate using crude product sodium pyrophosphate, the steps are as follows:

[0050] (1) Washing and beating of crude sodium pyrophosphate:

[0051] ①Initial washing: Add the crude sodium pyrophosphate and sodium pyrophosphate mother liquor into a stirred tank with a filter plate, and stir for 2 hours at a temperature of 15°C, so that the anhydrous sodium pyrophosphate and the water in the sodium pyrophosphate mother liquor undergo a hydration reaction, Form crystalline hydrate, recover part of the water in the sodium pyrophosphate mother liquor, wash the sodium chloride and organic matter in the crude product at the same time, enter into the remaining sodium pyrophosphate mother liquor, play the purpose of concentrating the sodium pyrophosphate mother liquor, and Sodium pyrophosphate mother liquor is pre-cooled to below 15°C and then washed to obtain a mixed material liquid;

[0052] ② Filtration: After the mixed material liquid is ...

Embodiment 3

[0061] A method for preparing sodium pyrophosphate using crude product sodium pyrophosphate, the steps are as follows:

[0062] (1) Washing and beating of crude sodium pyrophosphate:

[0063] ①Initial washing: Add the crude sodium pyrophosphate and sodium pyrophosphate mother liquor into a stirred tank with a filter plate, and stir for 1.5 hours at a temperature of 28°C, so that the anhydrous sodium pyrophosphate and the water in the sodium pyrophosphate mother liquor undergo a hydration reaction , forming crystalline hydrate, reclaiming part of the water in the sodium pyrophosphate mother liquor, washing the sodium chloride and organic matter in the crude product at the same time, and entering into the remaining sodium pyrophosphate mother liquor to achieve the purpose of concentrating the sodium pyrophosphate mother liquor, and During the reaction process, remove the reaction heat or pre-cool the sodium pyrophosphate mother liquor to below 15°C before washing, and finally ob...

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Abstract

The invention relates to a method for preparing sodium pyrophosphate from crude sodium pyrophosphate. The method comprises the following steps: [1] washing and pulping crude sodium pyrophosphate, namely (1) performing primary washing, (2) performing suction filtration, and (3) pulping; [2] purifying sodium pyrophosphate, namely mixing and dissolving a diluted sodium pyrophosphate solution and molten slag filtrate, adding activated carbon for adsorption, performing precise filtration so as to obtain precise filtrate and precise filter residues, and cooling and crystallizing the precise filtrate so as to obtain sodium pyrophosphate mother liquor and sodium pyrophosphate which can be used repeatedly; [3] circulating and reusing the sodium pyrophosphate mother liquor. As the sodium pyrophosphate mother liquor is recycled and used for washing and dissolving the crude sodium pyrophosphate, the yield of the sodium pyrophosphate can be greatly increased, the content of the sodium pyrophosphate in slag materials is reduced, the economic efficiency is improved, the energy efficiency is improved, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of preparing sodium pyrophosphate, in particular to a method for preparing sodium pyrophosphate using crude sodium pyrophosphate. Background technique [0002] Sodium pyrophosphate is an important species of condensed phosphate. Whether it is industrial grade or food grade, its consumption is second only to sodium tripolyphosphate. In industry, it is mainly used as complexing agent, degreasing agent, water treatment agent, washing, printing and dyeing bleaching agent, dispersant, etc. In the food industry, it is used for food water retention and freshness preservation, anti-oxidation, etc., collectively referred to as quality improvers. With the rapid development of my country's industrial-grade and food-grade sodium pyrophosphate market, the application, research and development and improvement of related core production technologies will surely become the attention of enterprises in the industry. The im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/42
CPCC01B25/425
Inventor 詹波朱建民姜胜宝刘冰张立新郑新王垚魏利
Owner ZHENJIANG JIANGNAN CHEM
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