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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 effect of high degree of continuity, simplified process operation, and saving equipment investment

Active Publication Date: 2008-01-02
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, the method that adopts twin-screw extruder to prepare potassium tripolyphosphate in one step has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Potassium carbonate is used as the potassium source, and 105% superphosphoric acid is used as the phosphorus source. 2 O:P 2 o 5 =5.0: 3, and make the initial temperature of raw material salt of wormwood and raw material superphosphoric acid bring up to 60 ℃, the salt of wormwood of 1.60kg adopts feeding screw to be added to the feed hopper of twin-screw with the speed metering of 7.10 g / min, simultaneously, 1.30 kg of 105% superphosphoric acid is also metered into the feed hopper of the twin-screw at a rate of 5.76 g / min by a peristaltic pump. The temperature settings up to the head part are: 95°C, 230°C, 380°C, 510°C, the residence time of the material in the barrel of the extruder is 0.5 hours to 1 hour, and the potassium tripolyphosphate obtained in the extruder The top is discharged in the form of white powder, after being cooled to ambient temperature and pulverized to a fineness of 0.20mm, the required potassium tripolyphosphate product is obtained;

Embodiment 2

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

Embodiment 3

[0029] The operating procedure is the same as that in Example 1, except that the initial temperature of raw material potassium carbonate and raw material superphosphoric acid is increased to 40° C., and the barrel of the extruder has 9 heating cylinder-type jacket temperature control sections, from the feed hopper to the extruder. The temperature settings of the head part are: 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 barrel of the extruder is 1.5 hours to 2 hour, the obtained potassium tripolyphosphate is discharged in the form of white powder at the top of the extruder, after being cooled to ambient temperature and pulverized to a fineness of 0.10mm, the required potassium tripolyphosphate product is obtained, and all the other are the same;

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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, thermal phosphoric acid two-ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C01B25/41
Inventor 杨亚斌樊蕾张鄞
Owner YUNNAN CHEM RES INST
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