Method of preparing ammonium polyphosphate by using phosphoric acid by wet process and yellow phosphorus as raw materials

A technology of ammonium polyphosphate and wet-process phosphoric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of not being fully soluble in water and high production costs, so as to benefit comprehensive fertilizer efficiency and reduce the cost of impurity removal , The effect of water insoluble matter reduction

Inactive Publication Date: 2016-02-24
BLACK P2 USA INC
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  • Application Information

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Problems solved by technology

This method uses wet-process phosphoric acid and yellow phosphorus as the main raw materials to reduce production costs, facilitate production operations, improve the water solubility of ammonium polyphosphate products, and overcome the thermal phosphoric acid and phosphoric acid used in the existing conventional ammonium polyphosphate prod

Method used

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  • Method of preparing ammonium polyphosphate by using phosphoric acid by wet process and yellow phosphorus as raw materials

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Effect test

Embodiment 1

[0025] First, the yellow phosphorus flows into the horizontal combustion furnace for high-temperature combustion. The combustion furnace is surrounded by a water circulation jacket for heat exchange and steam bubbles, and the generated hot water and steam are passed into the yellow phosphorus pool, the yellow phosphorus tank and the jacket of the yellow phosphorus pipe. Heating heating and heat preservation, the high temperature P generated by the combustion of yellow phosphorus 2 O 5 The flue gas enters the polymerization reaction tower, folds P 2 O 5 The wet-process phosphoric acid with a content of 40% enters the polymerization reaction tower at the same time, and the wet-process phosphoric acid, P 2 O 5 The mixture of equal composition undergoes polymerization reaction to generate polyphosphoric acid. The temperature of the mixture is relatively high. The circulating acid-resistant pump and acid-resistant pipeline are connected to the heat exchanger to control the liqui...

Embodiment 2

[0027] First, the yellow phosphorus flows into the horizontal combustion furnace for high-temperature combustion. The combustion furnace is surrounded by a water circulation jacket for heat exchange and steam bubbles, and the generated hot water and steam are passed into the yellow phosphorus pool, the yellow phosphorus tank and the jacket of the yellow phosphorus pipe. Heating heating and heat preservation, the high temperature P generated by the combustion of yellow phosphorus 2 O 5 The flue gas enters the polymerization reaction tower, folds P 2 O 5 The wet-process phosphoric acid with a content of 50% enters the polymerization reaction tower at the same time, and the wet-process phosphoric acid, P 2 O 5 The mixture of equal composition undergoes polymerization reaction to generate polyphosphoric acid. The temperature of the mixture is relatively high. The circulating acid-resistant pump and acid-resistant pipeline are connected to the heat exchanger to control the liqui...

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Abstract

The invention belongs to the technical field of polyphosphate production in the inorganic chemistry industry, and is a novel production technology for preparing ammonium polyphosphate by using phosphoric acid by wet process and yellow phosphorus as raw materials. According to a method innovation, a low-polymerization-degree ammonium polyphosphate product with good water solubility is prepared by adopting the phosphoric acid by wet process with converted P2O5 content of 30-50 percent, the yellow phosphorus and liquid ammonia as main raw materials. The method can be used for directly producing the product in two forms of solid and liquid, the production is easy to control, the energy consumption is low, the operation is easier, the product is easy to pack, the use is facilitated, the production cost is greatly lowered, the produced low-polymerization-degree ammonium polyphosphate product has the insoluble matter content of less than 1 percent, the polymerization degree of 2-10 and the polymerization ratio of 40-80 percent, and is suitable for making high-quality fluid fertilizers, and the fast development of modern agriculture in China can be greatly promoted.

Description

technical field [0001] The invention belongs to the technical field of polyphosphate production in the inorganic chemical industry, and is a novel production technology for preparing ammonium polyphosphate by using wet-process phosphoric acid and yellow phosphorus as raw materials. Background technique [0002] Ammonium polyphosphate, also known as ammonium polyphosphate or polycondensed ammonium phosphate (APP for short), is a polyphosphate containing N. According to the specific needs of use, it can produce oligomerization, medium polymerization and high polymerization. The higher the degree of polymerization, the lower the water solubility, and vice versa. According to its structure, it can be divided into crystalline and amorphous. Crystalline ammonium polyphosphate is a long-chain water-insoluble salt. The general molecular formula of ammonium polyphosphate is (NH 4 ) (n+2) P n O (3n+1) , when n is 2 to 20, it is water-soluble; when n is greater than 20, it is inso...

Claims

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Application Information

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IPC IPC(8): C01B25/40
Inventor 林明印华亮
Owner BLACK P2 USA INC
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