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Polyphosphoric acid preparation technology and production control method thereof

A preparation process and technology of polyphosphoric acid, applied in the field of phosphorus chemical industry, can solve problems such as low production efficiency and low temperature of feed liquid, and achieve the effects of improving production efficiency and device life, improving production efficiency, and stable and reliable process control.

Active Publication Date: 2011-03-16
YUNNAN JIANGLIN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to solve the problems of low feed liquid temperature and low production efficiency when using phosphoric anhydride dissolution method and enamel reaction kettle to prepare polyphosphoric acid, the present invention provides an industrial production method and special equipment for preparing polyphosphoric acid using phosphoric anhydride and orthophosphoric acid as raw materials , not only can improve production efficiency, but also can reduce the amount of impurities introduced in the production process

Method used

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  • Polyphosphoric acid preparation technology and production control method thereof
  • Polyphosphoric acid preparation technology and production control method thereof
  • Polyphosphoric acid preparation technology and production control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (i) fast dissolution stage of phosphoric anhydride: figure 1 In the shown preparation equipment, first add 690 kilograms of 85.1% industrial grade phosphoric acid to be the mother liquor, and add phosphoric anhydride under the condition that cooling water is passed into the cooling jacket for cooling, according to the present invention figure 2 The control area shown adjusts the rate of phosphoric anhydride addition;

[0051] (ii) rapid cooling stage of feed liquid: after adding 340 kg of phosphoric anhydride and dissolving, calculate the concentration of feed liquid at this time to be about 103%, and the temperature of feed liquid is shown as 104°C, stop adding phosphoric anhydride, increase the cooling water flow, Increase the stirring speed to cool the feed liquid to 58°C within 2-3 minutes, then stop the cooling water in the cooling jacket and drain the remaining cooling water in the cooling jacket;

[0052] (iii) slow dissolving stage of phosphoric anhydride: con...

Embodiment 2

[0054] Embodiment 2: In embodiment 1, replace 85.1% technical grade phosphoric acid with 85.12% food grade phosphoric acid as mother liquor, all the other situations are identical with embodiment 1.

[0055] Table 1. Analytical test results of polyphosphoric acid products

[0056]

[0057] For further illustrating the present invention's advantage under the control reaction, provide two examples here, the situation of the comparative experiment outside the control reaction situation:

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Abstract

The invention discloses a polyphosphoric acid preparation method and exclusive polyphosphoric acid preparation equipment therefore. The invention adopts phosphoric acid and phosphoric acid anhydride as raw materials and provides an improved manufacturing technology and a production control method thereof. The method comprises four stages of quick dissolution, quick cooling, slow dissolution and slow cooling. The temperature of reaction material and fluid is controlled within the range lower than the temperature produced by the material corrosion of a reaction kettle and higher than the solution temperature lower limit of phosphoric acid anhydride. The parameter of each stage in the whole process can be controlled by a programmable controller (PLC). The equipment adopting the method has the advantages of long service life, high production efficiency and good product quality.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, and relates to a preparation method and equipment for polyphosphoric acid, in particular to a preparation process for preparing polyphosphoric acid by phosphoric anhydride dissolution method and a production control method. Background technique [0002] Polyphosphoric acid is used in many industrial fields, organic synthesis catalysts, dehydrating agents, cyclizing agents, asphalt chemical modifiers, fuel cell electrolytes, synthetic fiber polymerization solvents and reaction media, and also used in organic pigments, phosphate esters, lubricant additives , surfactants, flame retardants and other preparations. [0003] There are four types of preparation methods for polyphosphoric acid: [0004] (1) Orthophosphoric acid dehydration method [0005] British patents GB1059787, GB1325936, GB1601474, French patent FR2570286 and U.S. patents US3440010, US4551319, US6616906 and a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/24
Inventor 万荣惠饶志臻后雪松王斌马兴良
Owner YUNNAN JIANGLIN GROUP
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