High temperature anticorrosive method by using self-reaction products

A reaction product, high temperature technology, applied in the direction of phosphorus oxide, etc., can solve the problems of increasing the difficulty and complexity of control, increasing energy consumption, unfavorable promotion and use, etc.

Inactive Publication Date: 2009-06-17
YUNNAN CHEM RES INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of the above two methods cannot use natural air, but require strict humidity control of the air, which not only increases energy consumption, but also has large differences in the moisture content of natural air under various climatic conditions. , which increases the difficulty and complexity of control, which is not conducive to popularization and use

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  • High temperature anticorrosive method by using self-reaction products

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Embodiment 1

[0019] The high-temperature anti-corrosion method using self-reaction products of the present invention is to use the reaction products produced in the production process of burning yellow phosphorus to produce phosphorus pentoxide to realize high-temperature anti-corrosion. The anti-corrosion method is as follows:

[0020] a. At normal temperature and pressure, the air leading to the combustion tower made of austenitic stainless steel is untreated non-dry air,

[0021] b. In the process of yellow phosphorus burning to generate phosphorus pentoxide, the mol ratio of its moisture and the phosphorus pentoxide produced by the reaction is controlled between 0.01~0.8, and the combustion tower wall temperature is reduced by cooling the combustion tower wall surface simultaneously, and Control the wall temperature below 490°C;

[0022] c. When yellow phosphorus burns, conjunctiva is formed on the tower wall, and the conjunctiva is super phosphoric acid.

[0023] In a set of thermal ...

Embodiment 2

[0025] In the yellow phosphorus combustion tower industrial device made of austenitic stainless steel, under normal natural air conditions, a two-step method is used to burn yellow phosphorus to produce thermal phosphoric acid and recover the reaction heat of yellow phosphorus. During the production process, the inner wall temperature of the control tower is lower than 350°C. After six months of continuous production, the conjunctiva was obtained from the inner wall of the combustion tower. The iron ion content in the conjunctiva is 9ppm, which shows that the conjunctiva has little corrosion to austenitic stainless steel and fully meets the requirements of production for equipment materials. All the other are with embodiment 1.

Embodiment 3

[0027]On a set of thermal phosphoric acid two-step production equipment put into operation in a certain place, the temperature is 30°C, the relative air humidity is 100% during two consecutive months of operation, and the air excess coefficient is 1.4, that is, the moisture in the combustion tower and the five gases produced by the reaction. The molar ratio of phosphorus oxide is 0.728. After stopping the vehicle for inspection, the conjunctiva in the tower was intact. Five days later, the conjunctiva melted and there was no trace of corrosion on the inner surface of the equipment, indicating that under this condition, conjunctiva will still form. The use of austenitic stainless steel can meet the requirements of burning yellow phosphorus. Long-term operation requirements of combustion tower equipment in the production process of phosphorus pentoxide or thermal phosphoric acid. All the other are with embodiment 1.

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Abstract

The invention relates to a method for high-temperature corrosion protection by utilizing self reaction products, in particular to anticorrosive technology for a combustion tower in production technology for preparing phosphoric anhydride or thermal phosphoric acid by combustion of yellow phosphorus. The method is to utilize the reaction products generated in the production process of preparing the phosphoric anhydride by combustion of the yellow phosphorus to realize high-temperature corrosion protection. The method is characterized by comprising: a, air pumped into the combustion tower at normal temperature and pressure is non-dried air at normal temperature and pressure; b, the wall surface of the combustion tower is cooled to reduce the temperature of the wall surface of the combustion tower during production of the phosphoric anhydride by combustion of the yellow phosphorus, and the temperature of the wall surface of the combustion tower is controlled to be less than 490 DEG C; and c, conjunctival matters are formed on the tower wall during combustion of the yellow phosphorus. Various technological conditions required by the method are easy to realize, and the actual control difficulty is small. Moreover, the method can also reduce the energy consumption and the production cost, is suitable to be applied in mass industrial production, and has great promotion value.

Description

technical field [0001] The invention relates to an anti-corrosion method, in particular to an anti-corrosion technology for a combustion tower in the production process of burning yellow phosphorus to produce phosphorus pentoxide or thermal phosphoric acid. Especially the combustion tower anti-corrosion technology in the industrial production of two-step method to produce thermal phosphoric acid and burning yellow phosphorus to produce phosphorus pentoxide. Background technique [0002] In industry, the method of burning yellow phosphorus is often used to produce phosphorus pentoxide, thermal phosphoric acid and other products. In the process of reaction between yellow phosphorus and oxygen, the high-temperature gas containing phosphoric acid and its polymers is extremely corrosive, which is harmful to combustion. The tower caused great damage, and maintenance had a great impact on the stability and continuity of production and the quality of products. Therefore, in order t...

Claims

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Application Information

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IPC IPC(8): C01B25/12
Inventor 梅毅杨亚斌龙萍马航
Owner YUNNAN CHEM RES INST
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