Novel STPP (sodium tripolyphosphate) production technology

A sodium tripolyphosphate, production process technology, applied in the direction of phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as complex process flow, achieve the effects of reducing energy consumption, solving waste residue treatment, and reducing reaction cycles

Active Publication Date: 2018-06-19
JIANGSU YOUTH CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of production technology of novel sodium tripolyphosphate, comprises the following steps:

[0030] 1) Put 184.6g of sodium pyrophosphate decahydrate, 18.7g of 85% phosphoric acid and 296.7g of water in a 500ml four-necked flask equipped with a stirrer and a thermometer, and heat up to 70°C. After the materials are completely dissolved, add a small amount of phosphoric acid and Water, adjust the specific gravity to 1.28, PH: 6.9;

[0031] 2) Pass the neutralization solution in step 1) through a spray dryer to dehydrate and dry the neutralization solution to obtain a mixed pyrophosphate with a moisture content of about 1%-2%;

[0032] 3) Put the mixed phosphate in step 2) into the crucible, and carry out dehydration polymerization for 30 minutes in a high-temperature environment of 320° C. to obtain 117.9 g of finished sodium tripolyphosphate. Sodium tripolyphosphate content 97.6%, P2O5 content 58.1%, water insoluble matter ≤ 0.10%, pH value 9.65, type I sodium tr...

Embodiment 2

[0035] A kind of production technology of novel sodium tripolyphosphate, comprises the following steps:

[0036] 1) Put 1846g of sodium pyrophosphate decahydrate, 187g of 85% phosphoric acid and 2967g of water into a 5000ml four-necked flask equipped with a stirrer and a thermometer, and heat up to 75°C. After the materials are fully dissolved, adjust the specific gravity to 1.30, PH: 6.9;

[0037] 2) Pass the neutralization solution in step 1) through a spray dryer to dehydrate and dry the neutralization solution to obtain a mixed pyrophosphate with a moisture content of about 1%-2%;

[0038] 3) Put the mixed phosphate in step 2) into the crucible, carry out dehydration polymerization for 40 minutes in a high temperature environment of 300° C., and obtain 1182.6 g of finished sodium tripolyphosphate. The content of sodium tripolyphosphate is 96.9%, the content of P2O5 is 57.8%, the water insoluble matter is ≤0.10%, the pH value is 9.64, the content of type I is ≥57%, and the ...

Embodiment 3

[0041] A kind of production technology of novel sodium tripolyphosphate, comprises the following steps:

[0042] 1) Put 369g of sodium pyrophosphate decahydrate, 37g of 85% phosphoric acid and 593g of water into a 1000ml four-neck flask equipped with a stirrer and a thermometer, and heat up to 80°C. After the materials are completely dissolved, adjust the specific gravity to 1.29, PH: 6.8;

[0043] 2) Pass the neutralization solution in step 1) through a spray dryer to dehydrate and dry the neutralization solution to obtain a mixed pyrophosphate with a moisture content of about 1%-2%;

[0044] 3) Put the mixed phosphate in step 2) into the crucible, carry out dehydration polymerization at 280° C. for 20 minutes, and obtain 234.1 g of finished sodium tripolyphosphate. The content of sodium tripolyphosphate is 96.6%, the content of P2O5 is 57.7%, the water insoluble matter is ≤0.10%, the pH value is 9.64, the content of type I is ≥57%, and the yield is 96.5%.

[0045] 4) The wa...

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Abstract

The invention discloses a novel STPP (sodium tripolyphosphate) production technology. The technology comprises steps as follows: sodium pyrophosphate decahydrate is added to phosphoric acid, temperature, PH value and specific gravity of a neutralization solution are regulated, a ratio of disodium dihydrogen pyrophosphate to sodium pyrophosphate in a flask reaches 1:1.7-1:2.0, the neutralization solution is dewatered and dried by a spray dryer, dried mixed pyrophosphate is subjected to water-loss polymerization in a high-temperature environment, and STPP is produced. According to the technology, sodium pyrophosphate decahydrate belongs to a waste residue produced by a pesticide enterprise, no waste residues are produced in the whole technological process, and the problem about waste residuetreatment of the pesticide enterprise is solved effectively; after direct application of sodium pyrophosphate decahydrate, the use amount of phosphoric acid is greatly reduced, a process of hydrolyzing sodium pyrophosphate into sodium orthophosphate is omitted, and production cost of the enterprise is effectively reduced.

Description

technical field [0001] The invention relates to a novel sodium tripolyphosphate production process, in particular to a novel sodium tripolyphosphate production process produced by utilizing industrial waste residues, and belongs to the technical field of phosphoric acid product production process. Background technique [0002] At present, there are mainly two existing production methods of sodium tripolyphosphate: [0003] One is: use 85% phosphoric acid and soda ash suspension or caustic soda liquid wet method to obtain the target product. The specific process is the neutralization reaction of phosphoric acid and soda ash, and adjust the ratio of disodium hydrogen phosphate and sodium dihydrogen phosphate to 2:1. The neutralized liquid is obtained, and the neutralized liquid is transported to a dry polymerization furnace, and obtained through high-temperature dehydration, polymerization, and cooling. This method not only needs expensive phosphoric acid and soda ash, but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/41
CPCC01B25/41
Inventor 周其奎王东朝汪国庆杨凡蔡靖冯杰
Owner JIANGSU YOUTH CHEM
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