Production method of solid orthophosphoric acid

A production method and technology of orthophosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high production cost, complex process and high energy consumption, and achieve low production cost, high yield and no return. the effect of

Active Publication Date: 2011-10-05
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have the following disadvantages: high energy consumption, large pollution, and high production costs
In fact, the mass percentage of raw phosphoric acid used for crystallization in this method is 96-99%, and does not involve the preparation of raw phosphoric acid. At the same time, the crystallization process is complicated, and a large amount of filtrate is produced during the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 1800g of thermal phosphoric acid with a mass percentage concentration of 85% and add it to the evaporation concentration device, raise the temperature to 262°C at a rate of 4°C / min, and evaporate and concentrate for 1.5h under normal pressure. Then, put the phosphoric acid solution after dewatering into a reactor capable of controlling the temperature, and add 14.4 g of hydrogen peroxide under the condition that the temperature drops to 130° C. and stir, and react for 20 minutes. After the reaction ends, the product drops to 28° C. Orthophosphoric acid seed crystals of 1% by mass of raw material phosphoric acid are added to obtain solid orthophosphoric acid.

Embodiment 2

[0014] Take 1800g of wet-process phosphoric acid with a mass percentage concentration of 70% and add it to the evaporation concentration device, heat it at a rate of 4°C / min to 200°C, and evaporate and concentrate it for 1.5h under the pressure of -0.085MPa. Then, put the phosphoric acid solution after water removal into a temperature-controllable reactor, and add 9.0 g of hydrogen peroxide under the conditions of temperature drop to 110°C and stirring, and react for 8 minutes. After the reaction ends, the product drops to 25°C , adding orthophosphoric acid seed crystals with a mass of 0.6% of the raw material phosphoric acid to obtain solid orthophosphoric acid.

Embodiment 3

[0016] Take 1800g of wet-process phosphoric acid with a mass percentage concentration of 80% and add it to the evaporation concentration device, heat it at a rate of 4°C / min to 180°C, and evaporate it for 1 hour under the pressure of -0.07MPa. Then, put the phosphoric acid solution after water removal into a temperature-controllable reactor, and add 7.2g of hydrogen peroxide under the condition that the temperature drops to 100°C and stir, and react for 15 minutes. After the reaction ends, the product drops to 20°C , adding orthophosphoric acid seed crystals with a mass of 0.7% of the raw material phosphoric acid to obtain solid orthophosphoric acid.

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Abstract

The invention discloses a production method of solid orthophosphoric acid, comprising the following steps: adding wet phosphoric acid or thermal phosphoric acid with the mass percent concentration of 70-85% into a concentrating device, heating to 130-262 DEG C at a speed of 4 DEG C per minute, concentrating for 1-2h under ordinary pressure to negative 0.085 MPa to obtain the dehydrated phosphoricacid solution with the mass percent concentration higher than 99%, placing the dehydrated phosphoric acid solution with the mass percent concentration higher than 99% into a reactor, the temperature of which is controllable, adding hydrogen peroxide by amount of 0.1-0.8% of the raw material acid, reacting for 8-30min at the temperature of 60-130 DEG C while stirring the mixture, cooling the reaction product to 10-28 DEG C, and adding orthophosphoric acid seed crystal to obtain the solid orthophosphoric acid. For the invention, the technique is simple and easy for industrialization, productioncost is low, productivity is high, the technique is characterized by having no return product, and the product is convenient in packaging and transporting.

Description

technical field [0001] The invention relates to the field of phosphoric acid production, in particular to a method for producing solid orthophosphoric acid. Background technique [0002] According to the amount of impurities in phosphoric acid, phosphoric acid is generally divided into fertilizer grade, industrial grade, food grade and electronic grade. Phosphoric acid that has not reached the industrial level can only be used in the chemical fertilizer industry to produce various phosphorus-containing fertilizers; in addition to being directly used for metal passivation, industrial-grade phosphoric acid is mainly used for the production of various phosphates, organic phosphorus chemical products and organic phosphorus Pesticides, and used in the metallurgical industry to produce phosphoric acid refractory mud to improve the life of steelmaking furnaces; food-grade phosphoric acid is mainly used as food additives, and used to produce food-grade phosphate; used in the pharmac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234
Inventor 刘飞李天祥解田杨帆严永友冉瑞泉田言杨丽萍
Owner WENGFU (GRP) CO LTD
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