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Method for producing polyphosphoric acid

A technology of polyphosphoric acid and production method, applied in phosphoric acid, phosphorus oxyacid, condensed phosphoric acid, etc., can solve the problems of excessive phosphorus pentoxide and high production cost, and achieve the advantages of reducing impurity content, low cost and saving energy consumption. Effect

Active Publication Date: 2008-09-24
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the amount of phosphorus pentoxide used is relatively large, resulting in higher production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 500g of wet-process phosphoric acid purification acid with a mass percentage concentration of 85% and add it to the vacuum distillation device, heat up to 160°C at a rate of 5°C / min, vacuum is 0.085MPa, and the stirring rate is 100rpm. 2h. Then, the phosphoric acid solution after dewatering is put into the polymerization reactor that can control reaction temperature, and electric stirrer is housed, and at temperature is 140 ℃, under the condition that stirring rate is 400rpm, adds phosphorus pentoxide 241g, over Hydrogen oxide 3g, polymerized for 3h, after the end of the reaction, the product was cooled to normal temperature, and a colorless transparent viscous liquid was obtained, which was polyphosphoric acid.

[0014] After testing: P in polyphosphoric acid 2 o 5 The content is 83.0%, the sulfate content is 3.5ppm, the chloride content is 7.4ppm, the iron content is 4.1ppm, the arsenic content is 15ppm, the heavy metal (calculated as Pb) content is 0.1ppm, the...

Embodiment 2

[0016] Take 500g of wet-process phosphoric acid purification acid with a mass percentage concentration of 85% and add it to the vacuum distillation device, heat it at a rate of 5°C / min to 220°C, vacuum is 0.07MPa, and the stirring rate is 140rpm. 1.5h. Then, the phosphoric acid solution after dewatering is put into can control reaction temperature, and in the polymerization reactor that electric stirrer is housed, be 150 ℃ at temperature, under the condition of 200rpm, add phosphorus pentoxide 227g, Hydrogen peroxide 2.6g, polymerized for 4.5h, after the reaction was completed and the product was cooled to normal temperature, a colorless transparent viscous liquid was obtained which was polyphosphoric acid.

[0017] After testing: P in polyphosphoric acid 2 o 5 The content is 82.6%, the sulfate content is 8.6ppm, the chloride content is 9.8ppm, the iron content is 9.8ppm, the arsenic content is 18.3ppm, the heavy metal content is 0.1ppm, the color is 20, and the viscosity is...

Embodiment 3

[0019] Take 500g of wet-purified phosphoric acid purification acid with a mass percentage concentration of 80% and add it to a vacuum distillation device, heat it at a rate of 5°C / min to 250°C, with a vacuum of 0.06MPa and a stirring rate of 160rpm. Distilled for 1h. Then, the phosphoric acid solution after the dehydration is put into can control reaction temperature, and in the polymerization reactor that electric stirrer is housed, be 120 ℃ at temperature, under the condition of 450rpm, add phosphorus pentoxide 221g, Hydrogen peroxide 2g, polymerized for 5 hours, after the reaction was completed and the product was lowered to normal temperature, a colorless transparent viscous liquid was obtained which was polyphosphoric acid.

[0020] After testing: P in polyphosphoric acid 2 o 5 The content is 83.3%, the sulfate content is 12ppm, the chloride content is 4.7ppm, the iron content is 8.7ppm, the arsenic content is 16ppm, the heavy metal content is 0.1ppm, the color is 20, a...

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Abstract

The invention discloses a manufacturing method of polyphosphoric acid, which comprises the following steps: 500g of wet phosphoric acid purification acid or thermal phosphoric acid of which the quality percentage concentration is 75-85percent is taken to be added into a vacuum distillation unit, the temperature rises to 160-300 DEG C in a speed of 5 DEG C / min, and the vacuum distillation unit is decompressed and distilled for 1-2h under the conditions that the vacuity is 0.0-0.085Mpa and the stirring speed is 100-300rpm; the phosphoric acid after water elimination is placed into a polymerization reactor which can control reaction temperature and is provided with an electric agitator, the quantity of the added phosphorus pentoxide is 41.4-49.2percent of raw material acid quantity and peroxide is 0.0032-0.0007percent of the raw material acid quantity under the conditions that the temperature is 80-150 DEG C and the stirring speed is 200-500rpm, and the polymerization is performed for 3-6h; when the reaction is over, the temperature of products is reduced to the normal temperature to obtain the polyphosphoric acid. The manufacturing method has the advantages of simple technics, easy industrialization, low cost, good quality, moderate operating conditions, low investment, cleaning and no pollution.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a production method of polyphosphoric acid. Background technique [0002] Polyphosphoric acid is mainly phosphoric acid above 105% (calculated as phosphoric acid). Polyphosphoric acid is not only an important chemical intermediate product, but also an important chemical product. It is widely used in pigments, pharmaceuticals, spices, leather, flame retardant manufacturing and other industries, such as cyclizing agent and acidifying agent in organic synthesis. and dehydrating agents, etc. In addition, it can also be used as a substitute for orthophosphoric acid. Compared with 85% phosphoric acid, the P of polyphosphoric acid 2 o 5 The higher content can reduce the storage cost of the effective substance per unit, and the transport of P per unit weight 2 o 5 The shipping cost is 40% less than ordinary phosphoric acid; and users can prepare phosphoric acid with different mass ...

Claims

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Application Information

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IPC IPC(8): C01B25/18C01B25/24
Inventor 刘飞李天祥陈立平袁斌解田隋岩峰
Owner WENGFU (GRP) CO LTD
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