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Method for preparing tripolyphosphate and hexametaphosphate products by using byproduct pyrophosphate

A technology of pyrophosphate and phosphoric acid, which is applied in the fields of chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of impurity control requirements or treatment methods for special treatment of sodium tripolyphosphate, hexabias, etc. Phosphate product method has no relevant reports and other issues

Inactive Publication Date: 2014-10-29
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0012] Except for patent 200910102655.9, the above-mentioned sodium tripolyphosphate synthesis process is not based on pyrophosphate and its compound salt as the main raw material, and the catalyst used is traditional ammonium nitrate or sodium nitrate. Although Chinese patent 87108248 discloses a method that uses three The whiteness control method of sodium polyphosphate whitening preparation product, but it has not been used in other trimer synthesis processes, and no special solution has been proposed in the above-mentioned patents in terms of water insoluble matter control
[0013] And what patent 200910102655.9 mainly adopts is the by-product composite phosphate produced from formic acid by phosphoric acidification of sodium formate. About 45% of its composition is orthophosphate, and about 55% is acid salts such as pyrophosphate and polyphosphate. The special treatment and control requirements or treatment methods for impurities required when the by-product recycled compound phosphate is prepared from sodium tripolyphosphate
[0014] There is no relevant report about the method of adopting pyrophosphate to produce hexametaphosphate product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The compound phosphate crude product prepared from phosphorus-containing waste produced by organophosphorus pesticides, wherein the crude product with a sodium pyrophosphate content of more than 85%.

[0048] Dissolve and crystallize the crude product of sodium pyrophosphate to obtain sodium pyrophosphate decahydrate crystals with a content of 96%. Take 1000 g of sodium pyrophosphate decahydrate crystals, add 650 to 700 g of water, and 48 to 52 g of 85% phosphoric acid. Mix in the reaction kettle, adjust the pH of the solution to 7.5, heat up the hydrolysis reaction, the reaction temperature is 120-135°C, the reaction pressure is about 0.2MPa, and the reaction time is 180min, so as to obtain the mixed phosphate solution.

[0049] Take 200g of mixed phosphate solution, then add 6-6.4g of 85% phosphoric acid, 0.22g of sodium chloride, 0.5g of sodium sulfate, and 0.7g of catalyst ammonium chloride into the mixed phosphate solution, and the pH of this solution is 6.5; Spray...

Embodiment 2

[0051] The compound phosphate crude product prepared from phosphorus-containing waste produced by organophosphorus pesticides, wherein the crude product with a sodium pyrophosphate content of more than 85%.

[0052] Dissolve and crystallize the crude product of sodium pyrophosphate to obtain sodium pyrophosphate decahydrate crystals with a content of 96%. Take 1000g of sodium pyrophosphate decahydrate crystals, add 1000-2000g of water, 100-130g of 85% phosphoric acid, and 2g of sodium chloride , sodium sulfate 4.5g, catalyst ammonium chloride 6.3g, the solution was spray-dried at 110-200°C to obtain a white solid powder, and reacted at a high temperature of 400-420°C for 60 minutes to obtain sodium tripolyphosphate product.

Embodiment 3

[0054] The compound phosphate crude product prepared from phosphorus-containing waste produced by organophosphorus pesticides, wherein the crude product with a sodium pyrophosphate content of more than 85%.

[0055] Dissolve and crystallize the crude product of sodium pyrophosphate to obtain sodium pyrophosphate decahydrate crystals with a content of 96%. Take 100g of sodium pyrophosphate decahydrate crystals, add 49-51g of 85% phosphoric acid, and react at a high temperature of 700°C after mixing evenly After 30 minutes, after the reaction, the product can be quenched, tableted and crushed to obtain the sodium hexametaphosphate product.

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Abstract

The invention relates to transformation of phosphates, and particularly relates to a method for preparing tripolyphosphate and hexametaphosphate products by taking pyrophosphates (obtained in the process of recycling phosphorus-containing wastes generated in organophosphorus pesticide production) as a main raw material. The method for preparing the tripolyphosphate and / or hexametaphosphate products is characterized by comprising the steps of pretreating the pyrophosphates used as the raw material, adding phosphoric acid and a conditioning agent and controlling polymerization temperature.

Description

technical field [0001] The present invention relates to a kind of conversion of phosphate, more specifically, relate to a kind of method that by-product sodium (potassium) pyrophosphate is converted into tripolyphosphate sodium (potassium) salt and hexametaphosphate sodium (potassium) salt. Background technique [0002] Based on the pressure of resources and environment, since the late 1990s, people began to study the technology of removing and recovering phosphorus from phosphorus-containing waste, and some progress has been made. [0003] With the development and continuous maturity of phosphorus-containing wastewater resource recovery and utilization technology, a large number of phosphate products, especially various condensed phosphoric acids, are formed through the recovery of phosphorus elements in high-phosphorus pesticide production waste and phosphorus chemical industry high-phosphorus wastewater Salt products. "A method for treating phosphorus-containing waste fr...

Claims

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Application Information

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IPC IPC(8): C01B25/40C01B25/44
Inventor 王位周曙光詹波祝小红秦龙陈静黄鑫佘慧玲崔小芳
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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