Microfilm evaporator, rectifying system including same and rectifying method utilizing same

Abstract

The invention relates to a microfilm evaporator and a rectifying process utilizing the same. The microfilm evaporator comprises a microfilm evaporator shell, wherein a material evaporation hole is formed in the top of the shell, a material outlet is formed in the bottom of the shell, and a material inlet and an overflowing hole are formed in the middle of the shell; and multiple layers of hollow evaporation plate groups are arranged in the microfilm evaporator. When the microfilm evaporator is utilized for carrying out rectification, materials flow through a tower bottom metering pump of a rectifying tower, tower bottom liquid is pumped into the microfilm evaporator, a liquid film is formed on an evaporation plate, light-component substances rise along the plate surface to enter the rectifying tower, and heavy-component substances fall along the plate surface to reflow to a tower bottom. The microfilm evaporator and the rectifying process have the beneficial effects that the evaporation efficiency is high, the separation time is short, the consumption of energy resources can be effectively reduced, the volume of the microfilm evaporator is small, the mounting space is saved, the purities of the acquired effective components are high, the discharging amount of waste is reduced, and the environmental pollution is alleviated.

Description

technical field [0001] The invention relates to an evaporator for chemical production, in particular to a micro-film evaporator using micro-film evaporation technology and a rectification process using the evaporator. Background technique [0002] The method of making the liquid to be evaporated form a microfilm on the surface of the heat exchange device, and then evaporate is called microfilm evaporation. This method is widely used in chemical, pharmaceutical, food, metallurgy and other fields due to its large vaporization surface area, fast and uniform heat transmission, and no influence of liquid co-pressure, which can better prevent material overheating. . [0003] Tower equipment is widely used in chemical production. The main tower equipment includes reaction tower, rectification tower, distillation tower, etc. Traditional tower equipment mainly relies on reboiler evaporation to work. In the current distillation technology, the most used reboiler is the tube heat exc...

AI Technical Summary

Problems solved by technology

In the current distillation technology, the most used reboiler is the tube heat exchanger, but the working efficiency of the tube heat exchanger is limited by the wall thickness of the tube and the area of ​​the tube, and the heat transfer efficiency is not very ideal.

[0004] In order to improve the heat exchange efficiency, we often design the effective heat exchange area of ​​the reboiler to be large to accommodate more heat exchange pipes and increase the heat exchange area to meet the evaporation requirements. For example, Chinese patent CN202128924U adopts two diameters For different heat exchange tubes, the small-diameter pipe is sleeved in the large-diameter pipe, and an interlayer cavity is formed between the inner wall of the outer tube and the outer wall of the inner tube. The heat medium is passed into the interlayer cavity to perform heat exchange treatment on the material. The method can improve the heat exchange efficiency to a certain extent, but in essence, the purpose of heat exchange is achieved by increasing the heat exchange area.

Moreover, when using the shell and tube heat exchanger for evaporation work, it needs to consume a lot of energy, resulting in a large waste

In addition, due to the low heating efficiency, the separation speed of the components in the material is slow, and the separation of the components is not complete, resulting in an increase in the amount of waste discharged.

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