Reutilization method of low-pressure byproduct steam in maleic anhydride production process

Abstract

The invention discloses a reutilization method of low-pressure byproduct steam in a maleic anhydride production process. The low-pressure byproduct steam the pressure of which is 0.7-04MPa in the maleic anhydride production process is collected to a flash drum by a pipeline, when the pressure of the steam aggradated in the flash drum achieves a setting value, steam is subjected to steam-water separation in the flash drum and is subjected to flash vaporization so as to obtain flash steam, and the flash steam is output through a one-way valve of the flash drum and is utilized. The moisture content of the flash steam obtained by the method is low, the heating speed is rapid, the utility value is high, the flash steam contains less water content, the heat recovery use ratio is improved, and the purposes of the energy saving, emission reducing and consumption reducing are realized.

Description

technical field [0001] The invention belongs to the field of maleic anhydride production, and in particular relates to a recycling method for low-pressure by-product steam in the maleic anhydride production process. Background technique [0002] Maleic anhydride is an important basic organic chemical raw material. In the production process of maleic anhydride by benzene oxidation method or n-butane oxidation method, the oxidation section is a strong continuous exothermic process, which can generate 2.0MPa ~ 1.6MPa steam. These During the production process, the steam passes through the high-pressure steam drum and the medium-pressure steam drum, and then is transported to each workshop by the steam distributor for production use. After this part of steam is used, it can produce a large amount of low-pressure by-product steam at about 0.6 MPa. These low-pressure by-product steams have a large water content. If they are used for production, they have disadvantages such as slow...

AI Technical Summary

Problems solved by technology

After this part of steam is used, it can produce a large amount of low-pressure by-product steam at about 0.6MPa. These low-pressure by-product steams have a large water content. If they are used for production, they have disadvantages such as slow heating speed. Due to their small use value, maleic anhydride manufacturers at home and abroad Generally, this part of the by-product steam is directly discharged or cooled and supplemented with deionized water for reuse.