Potassium tripolyphosphate preparation method

A technology of potassium tripolyphosphate and potassium carbonate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve the effects of saving equipment investment, reducing production costs, and simplifying process operations

Active Publication Date: 2006-07-12
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] And up to now, take potassium carbonate as potassium source, take superphosphoric acid as phosphorus source, t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Potassium carbonate is used as potassium source, 105% superphosphoric acid is used as phosphorus source, and the molar ratio K 2 O:P 2 O 5 = 5.0: 3, and the initial temperature of raw material potassium carbonate and raw material superphosphoric acid is raised to 60 ℃, and the potassium carbonate of 1.60kg is metered into the feed hopper of the twin-screw at a speed of 7.10 g / min using a feeding screw, and at the same time, 1.30 kg of 105% superphosphoric acid was also metered into the twin-screw feed hopper using a peristaltic pump at a rate of 5.76 g / min. The extruder barrel had 4 heated barrel-jacketed temperature control sections, self-feeding from the feed hopper. The temperature of the head part is set as follows: 95°C, 230°C, 380°C, 510°C, the residence time of the material in the extruder barrel is 0.5 hour to 1 hour, and the obtained potassium tripolyphosphate is in the extruder. The top of the powder is discharged in the form of white pow...

Example Embodiment

[0026] Example 2

[0027] The operation procedure is the same as in Example 1, except that the initial temperature of the raw material potassium carbonate and raw material superphosphoric acid is increased to 50 ° C, and the extruder barrel has 6 heating barrel jacket temperature control sections, from the feeding hopper to the machine. The temperature of the head part is set as follows: 80°C, 170°C, 240°C, 350°C, 460°C, 520°C, the residence time of the material in the extruder barrel is 1 hour to 1.5 hours, and the rest are the same;

Example Embodiment

[0028] Example 3

[0029] The operation procedure is the same as in Example 1, except that the initial temperature of the raw material potassium carbonate and raw material superphosphoric acid is increased to 40 ° C, and the extruder barrel has 9 heating barrel jacket temperature control sections, from the feeding hopper to the machine. The temperature of the head part is set as follows: 60°C, 130°C, 200°C, 260°C, 310°C, 370°C, 430°C, 490°C, 530°C, and the residence time of the material in the extruder barrel is 1.5 hours to 2 hour, the obtained potassium tripolyphosphate was discharged in the form of white powder at the top of the extruder, and the desired potassium tripolyphosphate product was obtained after being cooled to ambient temperature and pulverized to a fineness of 0.10 mm, and the rest were the same;

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PUM

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Abstract

The invention discloses a making method of potassium tripolyphosphate, which comprises the following steps: proceeding one-step potassium tripolyphosphate synthetic process through high temperature of peroxyphosphoric acid and anhydrous potassium carbonate; producing the needed potassium tripolyphosphate through mixing, neutralizing, drying, grinding, sintering and disintegrating by twin-screw plodder. The invention simplifies the flow path and saves the equipment investment, which improves the conversion rate and quality.

Description

technical field [0001] The present invention relates to the preparation method of phosphate, more specifically, relate to a kind of preparation method of potassium tripolyphosphate. Background technique [0002] Potassium tripolyphosphate is white crystal or powder, molecular formula K 5 P 3 o 10 , molecular weight 448.35, relative density 2.5408g / cm3, melting point 620-640 ℃, very soluble in water, its aqueous solution is alkaline, and will gradually hydrolyze in water to form orthophosphate. [0003] Potassium tripolyphosphate is widely used in industry and food processing industry as corrosion inhibitor, scale inhibitor, emulsifier, moisturizing Agents, stabilizers, tissue modifiers, binders, color retainers, antioxidants and preservatives. [0004] There are many ways to prepare potassium tripolyphosphate, and the processes are different according to the raw materials. Commonly used methods include superphosphoric acid one-step method, therm...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01B25/41
Inventor 杨亚斌樊蕾张鄞
Owner YUNNAN CHEM RES INST
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