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Process for preparing polyphosphoric acid by utilizing wet-process phosphate purified acid

A technology of wet-process phosphoric acid and polyphosphoric acid, which is applied in the field of wear-resistant balls, can solve the problems of prolonged production time and cumbersome reaction steps, and achieve the effects of increased polycondensation speed, simple process steps, and small particle size

Inactive Publication Date: 2018-08-24
FARMASINO PHARMA ANHUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technical solution, phosphoric acid needs to be vacuum distilled to anhydrous first, which will greatly prolong the production time. At the same time, a certain amount of hydrogen peroxide needs to be added as a purification reagent in the post-polymerization reaction, which makes the reaction steps more cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of technology that utilizes wet-process phosphoric acid to purify acid to produce polyphosphoric acid, comprises the following steps:

[0022] (1) Add 100kg of wet-process phosphoric acid purification acid into the reaction kettle, heat up the wet-process phosphoric acid purification acid to 90°C while stirring at a stirring speed of 160r / min, and then stir at a constant temperature;

[0023] (2) Directly heat 60kg of phosphorus pentoxide to 578°C to melt it; adjust the stirring speed in the reactor to 900r / min, and then centrifugally atomize the melted phosphorus pentoxide into 35μm Phosphorus pentoxide mist droplets, and sprayed into the wet-process phosphoric acid purification acid of the reaction kettle; after spraying, continue to stir at a stirring speed of 320r / min for 120min, the reactant becomes a transparent liquid, stop stirring, that is, poly phosphoric acid.

[0024] The mass percent concentration of the above-mentioned wet-process phosphoric acid p...

Embodiment 2

[0027] A kind of technology that utilizes wet-process phosphoric acid to purify acid to produce polyphosphoric acid, comprises the following steps:

[0028] (1) Add 100kg of wet-process phosphoric acid purification acid into the reaction kettle, heat up the wet-process phosphoric acid purification acid to 95°C while stirring at a stirring speed of 180r / min, and then stir at a constant temperature;

[0029] (2) Directly heat 60kg of phosphorus pentoxide to 590°C to melt it; adjust the stirring speed in the reactor to 850r / min, and then centrifugally atomize the melted phosphorus pentoxide into an average Phosphorus pentoxide mist droplets with a particle size of 50 μm are sprayed into the wet-process phosphoric acid purification acid of the reaction kettle; after spraying, continue to stir at a stirring speed of 240r / min for 120min, the reactant becomes a transparent liquid, and the stirring is stopped, that is, polyphosphoric acid.

[0030] The mass percent concentration of t...

Embodiment 3

[0033] A kind of technology that utilizes wet-process phosphoric acid to purify acid to produce polyphosphoric acid, comprises the following steps:

[0034] (1) Add 100kg of wet-process phosphoric acid purification acid into the reaction kettle, heat up the wet-process phosphoric acid purification acid to 88°C while stirring at a stirring speed of 100r / min, and then stir at a constant temperature;

[0035] (2) Heat 55kg of phosphorus pentoxide directly to 575°C to melt it; adjust the stirring speed in the reactor to 700r / min, and then centrifugally atomize the melted phosphorus pentoxide into an average Phosphorus pentoxide mist droplets with a particle size of 30 μm are sprayed into the wet-process phosphoric acid purification acid of the reaction kettle; after spraying, continue to stir at a stirring speed of 320r / min for 100min, the reactant becomes a transparent liquid, and the stirring is stopped, that is, polyphosphoric acid.

[0036] The mass percent concentration of t...

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Abstract

The invention provides a process for preparing polyphosphoric acid by utilizing wet-process phosphate purified acid. The process comprises the following steps: (1), adding the wet-process phosphate purified acid into a reaction kettle, heating the wet-process phosphate purified acid to 85 to 95 DEG C while stirring, and then stirring at a constant temperature; (2), directly heating phosphorus pentoxide to 575 to 590 DEG C and ensuring that the phosphorus pentoxide is melted; regulating stirring speed in the reaction kettle to 700 to 900r / min, subsequently, centrifugally atomizing the melted phosphorus pentoxide into phosphorus pentoxide fog droplets with the thickness of 30 to 50 micrometers, and then spraying the phosphorus pentoxide fog droplets into the wet-process phosphate purified acid in the reaction kettle; continuously stirring for 100 to 150 minutes after the spraying is ended to ensure that a reactant becomes transparent liquid; stopping stirring to obtain the polyphosphoricacid. The process disclosed by the invention has the advantages of simple steps, short production time and low production cost; moreover, the prepared polyphosphoric acid can reach the food-grade requirement.

Description

technical field [0001] The invention relates to the field of wear-resistant balls, in particular to a process for preparing polyphosphoric acid from wet-process phosphoric acid. Background technique [0002] Polyphosphoric acid, also known as tetrapolyphosphoric acid, polyphosphoric acid or polyphosphoric acid, is a colorless, transparent, viscous liquid, easy to deliquescence, non-crystallizing, corrosive, and can be miscible with water and hydrolyzed into orthophosphoric acid, which is a dipolar inorganic acid. Corrosion items. In the phosphating industry, ω(H 3 PO 4 ) Phosphoric acid above 105% is called polyphosphoric acid, which is different from ordinary concentrated phosphoric acid and is actually a mixture of a series of phosphoric acid polymers. Polyphosphoric acid is widely used in the manufacturing industries of pigments, pharmaceuticals, spices, leather and flame retardants, such as cyclizing agent, acidifying agent and dehydrating agent in organic synthesis. ...

Claims

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Application Information

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IPC IPC(8): C01B25/24
CPCC01B25/24
Inventor 燕立波燕立兵王丽
Owner FARMASINO PHARMA ANHUI
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