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Aluminum dihydrogen tripolyphosphate continuous production method and device

A technology of aluminum dihydrogen tripolyphosphate and aluminum dihydrogen phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as large fluctuations in purity, low degree of automation, and unstable product quality, and achieve Low production cost, good economic and social benefits, and feasible process

Inactive Publication Date: 2016-05-25
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is a continuous production process with automatic control. Through digital control, the production is convenient and the product quality is stable; the particle size of the obtained aluminum dihydrogen phosphate is uniform, and the purity can reach more than 90%, which solves the problem of the current two-step intermittent process automation The degree is not high, the product quality is unstable, and the purity fluctuates greatly, etc.

Method used

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  • Aluminum dihydrogen tripolyphosphate continuous production method and device
  • Aluminum dihydrogen tripolyphosphate continuous production method and device
  • Aluminum dihydrogen tripolyphosphate continuous production method and device

Examples

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Effect test

Embodiment 1

[0039] A method for continuously producing aluminum dihydrogen tripolyphosphate, comprising the following steps:

[0040] (1) Neutralization reaction: under normal temperature and pressure, add quantitative continuous water and 85% industrial phosphoric acid to the double-chamber reaction kettle 2 at a weight ratio of 0.25:1, stir, and mix with 85% industrial phosphoric acid and activated alumina’s P / Al molar ratio=2.9:1 ratio, the activated alumina is quantitatively and continuously passed into the double-chamber reactor 2 in the form of screw feeding, and the liquid aluminum dihydrogen phosphate is obtained after the neutralization reaction;

[0041] (2) Spray drying: the specific gravity is 1.35, and the liquid aluminum dihydrogen phosphate heated to a temperature of 50°C through the pipeline heater 17 is continuously and uniformly passed into the centrifugal spray dryer 4 through the liquid pump 3, and the nozzle speed of the centrifugal spray dryer 4 is The control is 13...

Embodiment 2

[0049] A method for continuously producing aluminum dihydrogen tripolyphosphate, comprising the following steps:

[0050] (1) Neutralization reaction: under normal temperature and pressure, add quantitative continuous water and 85% industrial phosphoric acid to the double-chamber reactor 2 at a weight ratio of 0.30:1, stir, and mix with 85% industrial phosphoric acid and the P of activated alumina. / Al molar ratio=3.0:1 ratio, the activated alumina is quantitatively and continuously passed into the double-chamber reactor 2 in the form of screw feeding, and the liquid aluminum dihydrogen phosphate is obtained after the neutralization reaction;

[0051] (2) Spray drying: the specific gravity is 1.38, and the liquid aluminum dihydrogen phosphate heated to a temperature of 55°C through the pipeline heater 17 is continuously and evenly passed into the centrifugal spray dryer 4 through the liquid pump 3, and the nozzle speed of the centrifugal spray dryer 4 is The control is 14500r / ...

Embodiment 3

[0059] A method for continuously producing aluminum dihydrogen tripolyphosphate, comprising the following steps:

[0060] (1) Neutralization reaction: under normal temperature and pressure, add quantitative continuous water and 85% industrial phosphoric acid to the double-chamber reaction kettle 2 at a weight ratio of 0.32:1, stir, and add 85% industrial phosphoric acid to the P of activated alumina. / Al molar ratio=3.0:1 ratio, the activated alumina is quantitatively and continuously passed into the double-chamber reactor 2 in the form of screw feeding, and the liquid aluminum dihydrogen phosphate is obtained after the neutralization reaction;

[0061] (2) Spray drying: the specific gravity is 1.40, and the liquid aluminum dihydrogen phosphate heated to a temperature of 60°C through the pipeline heater 17 is continuously and evenly passed into the centrifugal spray dryer 4 through the liquid pump 3, and the nozzle speed of the centrifugal spray dryer 4 is The control is 14500...

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Abstract

The invention provides an aluminum dihydrogen tripolyphosphate continuous production method and device. The production method comprises the steps: preparing liquid aluminum dihydrogen phosphate by adopting activated aluminum oxide and 85% industrial phosphoric acid, centrifugally atomizing and drying to obtain aluminum dihydrogen phosphate powder, calcining, condensing, hydrating, drying and crushing to obtain aluminum dihydrogen tripolyphosphate powder. The aluminum dihydrogen tripolyphosphate continuous production method is an automatically-controlled continuous production process and is convenient in production and stable in product quality by virtue of digitalized control; and the prepared aluminum dihydrogen tripolyphosphate particles are uniform in size, the purity reaches 92 percent or more, compared with the prior art, the purity is increased by 15 to 18, and the problems of the existing two-step-method intermittent process that the automation degree is not high, the product quality is unstable and the purity is large in fluctuation are solved.

Description

technical field [0001] The invention belongs to the technical field of inorganic fine chemicals preparation, relates to a phosphate preparation method, in particular to a continuous production method and device of aluminum dihydrogen tripolyphosphate. Background technique [0002] Aluminum dihydrogen tripolyphosphate is divided into type I AlH according to its structure 2 P 3 o 10 ·xH 2 O and Type II AlH 2 P 3 o 10 , the most research and application report is type Ⅰ dihydrate. Due to its special properties, aluminum dihydrogen tripolyphosphate type I dihydrate (hereinafter referred to as ATP) is used as an inorganic fine chemical in the application of environmentally friendly anti-rust pigments, ion exchangers, refractory materials, inorganic molding materials, catalysts, etc. It has received extensive attention. Its industrial synthesis adopts a two-step method, that is, the intermediate acid aluminum phosphate is prepared by the reaction of aluminum hydroxide and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/40
CPCC01B25/40C01P2002/72C01P2004/03C01P2004/61C01P2004/62C01P2006/80
Inventor 袁爱群黄增尉韦冬萍周泽广白丽娟吴胜富
Owner GUANGXI UNIV FOR NATITIES
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