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Method for producing anti-crushing granular sodium tripolyphosphate

A technology of sodium tripolyphosphate and production method, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of inability to guarantee dissolution rate results, increased humidification, sieving, low particle structure strength, etc. Risk of scalding and burns, ensuring dissolution rate, and improving work comfort

Active Publication Date: 2018-09-04
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned technology can indeed reduce the degree of agglomeration and compaction by forming granular sodium tripolyphosphate, but the particle structure strength is low, and the particle structure is easily damaged during long-distance transportation and long-term storage, so that the dissolution rate cannot be guaranteed.
[0004] There is also the use of prehydration technology such as CN102502559A to agglomerate sodium tripolyphosphate in advance to form granular sodium tripolyphosphate, but this method increases equipment such as humidification and screening, and can only take products between 40-100 meshes, and the yield is low

Method used

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  • Method for producing anti-crushing granular sodium tripolyphosphate
  • Method for producing anti-crushing granular sodium tripolyphosphate
  • Method for producing anti-crushing granular sodium tripolyphosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First add 5 tons of water to the neutralization pot, add 4.5 tons of industrial grade soda ash, stir to completely dissolve the soda ash, and slowly add 6.06 tons of 85% phosphoric acid and 3.5 tons of solid sodium carbonate to react under stirring. Steam is heated to the system temperature of 40°C, 40kg of sodium hexametaphosphate and 40kg of potassium polymetaphosphate are added to the neutralization pot after compatibility, the reaction is finely filtered, and then sent to the drying tower to dry at 130°C by countercurrent drying, and sent to the polymerization furnace at 210°C , 5Hz frequency, polymerization 50min to generate sodium tripolyphosphate.

[0027] The overall reaction process can be represented by the following reaction formula:

[0028] 6H 3 PO 4 +5Na 2 CO 3 →4Na 2 HPO 4 +2NaH 2 PO 4 +5CO 2 ↑+5H 2 o

[0029] NaH 2 PO 4 +2Na 2 HPO 4 →Na 5 P 3 o 10 +2H 2 o

[0030] Determination of dissolution rate:

[0031] Keep the temperature of th...

Embodiment 2

[0034] Add 15 tons of water into the neutralization pot, add 4.5 tons of industrial-grade soda ash, stir to completely dissolve the soda ash, and slowly add 6.015 tons of 85% phosphoric acid and 3.5 tons of solid sodium carbonate to react under stirring. Steam is heated to the system temperature of 50°C, 55kg of sodium hexametaphosphate and 55kg of potassium polymetaphosphate are added to the neutralization pot after compatibility, the reaction is refined and filtered, then sent to the drying tower to dry at 140°C by countercurrent drying, and sent to the polymerization furnace at 200°C , 6Hz frequency, polymerization 60min to generate sodium tripolyphosphate.

[0035] Determination of dissolution rate:

[0036] Keep the temperature of the environment and water at 20°C, put 10g of sample into the beaker with 100ml of water in a 250ml beaker at a stirring speed of 1200rmp, observe the dissolution phenomenon until no visible white solid is the end point of dissolution. Record t...

Embodiment 3

[0039] Add 15 tons of water into the neutralization pot, add 3.5 tons of industrial grade soda ash, stir to completely dissolve the soda ash, and slowly add 6.107 tons of 85% phosphoric acid and 4.5 tons of solid sodium carbonate to react under stirring. Steam is heated to the system temperature of 450°C, 70kg of sodium hexametaphosphate and 70kg of potassium polymetaphosphate are added to the neutralization pot after compatibility, the reaction is refined and filtered, then sent to the drying tower to dry at 120°C by countercurrent drying, and sent to the polymerization furnace at 220°C , 4Hz frequency, polymerization for 55min to generate sodium tripolyphosphate.

[0040] Determination of dissolution rate:

[0041] Keep the temperature of the environment and water at 20°C, put 10g of sample into the beaker with 100ml of water in a 250ml beaker at a stirring speed of 1200rmp, observe the dissolution phenomenon until no visible white solid is the end point of dissolution. Rec...

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Abstract

The invention provides a method for producing anti-crushing granular sodium tripolyphosphate. The method comprises the following steps: (1) a neutralization reaction: adding water into a neutralization pot for heating, adding soda ash, carrying out stirring to completely dissolve the soda ash, raising the temperature of a formed solution to 40-50 DEG C, slowly adding phosphoric acid under stirring, adjusting the K value of neutralized slurry to 2.8+ / -0.1, then adding potassium metaphosphate and sodium hexametaphosphate, carrying out a reaction for 45 min and then carrying out filtering to obtain viscous slurry for subsequent usage; (2) drying and dehydration: conveying the viscous slurry obtained after neutralization to a drying tower for atomization and dehydration at 130+ / -10 DEG C; and(3) polymerization: sending the dried and dehydrated raw material back to a rotary polymerization furnace for polymerization at 210+ / -10 DEG C so as to obtain the anti-crushing granular sodium tripolyphosphate. The production method provided by the invention has the advantages of low raw material cost, simple process, easy industrialization and easy availability of raw materials; and the preparedgranular sodium tripolyphosphate has high anti-crushing strength and is not damaged in structure during transportation and storage.

Description

technical field [0001] The invention relates to a preparation method of sodium tripolyphosphate, in particular to a production method of anti-shattering granular sodium tripolyphosphate. Background technique [0002] Sodium tripolyphosphate is used as a softener, dispersant, and dyeing aid. Used as a softener for industrial water, reducing the content of calcium, magnesium, iron and other metal ions in industrial water, and reducing the hardness of water; used as a dispersant in industrial configurations such as paint, kaolin, magnesium oxide, calcium carbonate, etc., used for drilling mud dispersion agent. In addition, it can also be used as a water reducer for molds such as detergent additives, food additives, and gypsum. In industrial applications, sodium tripolyphosphate is generally prepared as an aqueous solution for use. If a large amount of powdered sodium tripolyphosphate is poured into water, it will instantly agglomerate and form a block, which will affect subse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/41
CPCC01B25/41
Inventor 郑旺屈云张亚娟李维
Owner HUBEI XINGFA CHEM GRP CO LTD
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