Internal energy integrated rectifying device for three-component separation and rectification method using same

An internal energy, three-component technology, applied in the field of rectification, can solve the problems of underutilization of heat, high condensation load and reboil load, so as to improve heat utilization rate, reduce reboil load and condensation load, and reduce effective The effect of energy loss

Active Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the heat inside the current dividing wall column rectification device is not fully utilized, resulting in high condensation load and reboil load, the present invention proposes a method for The rectification device with internal energy integration of three-component separation fully optimizes the heat exchange process inside the rectification tower, fully improves the heat utilization rate, and at the same time avoids the situation that the gas enters the compressor with liquid and affects the normal operation and life of the compressor. , In addition, the contact between the gas-liquid two-phase in the tower is strengthened, and the separation efficiency of the rectification tower is improved

Method used

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  • Internal energy integrated rectifying device for three-component separation and rectification method using same
  • Internal energy integrated rectifying device for three-component separation and rectification method using same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment discloses a rectification device with internal energy integration for the separation of three components:

[0036] The rectification device comprises a rectification tower with inner and outer double-layer tower bodies, the outer tower body 2 is a stripping section, the inner tower body 3 is a rectification section, and the inner tower body is provided with a partition 1, the partition The plate 1 is composed of a first partition 101 arranged in the radial direction and a second partition 102 arranged in the axial direction. The first partition 101 is arranged on the upper part of the inner tower body 3, and its outer edge and the inner tower body 3. The tower wall is sealed, and the inner edge is connected and sealed with the top of the second partition 102, and the side of the second partition 102 is sealed with the inner tower body 3 tower walls, and the bottom is kept at a distance from the bottom of the inner tower bottom 3; The feed inlet I14 arran...

Embodiment 2

[0039] This embodiment discloses the method utilizing the device of embodiment 1 to carry out rectification:

[0040] After the feed is heated by the feed preheater 4, it enters the outer tower body 2 of the rectification tower through the feed inlet I14 for gas-liquid exchange. After the liquid phase is separated, the gas outlet I15 enters the compressor 11 through the compressor inlet superheater 7 to increase the pressure, and then enters the bottom of the inner tower body 3 through the feed inlet II16 to provide reboiling heat for the inner tower body 3; The bottom liquid phase of the outer tower body 2 is divided into three parts after the liquid outlet I21, one part is discharged from the tower bottom discharge pipe 27, and the other part is returned to the outer layer tower body 2 through the reboiler 10 through the feed inlet V22 The bottom provides reboil heat for the outer tower body 2, and the third part returns to the bottom of the outer tower body 2 through the au...

Embodiment 3

[0042] The present embodiment provides a kind of concrete process parameter and the result that utilize the method for embodiment 2 to carry out rectification:

[0043] The feed to the rectification tower is a benzene-cyclohexane system with a feed rate of 100 kmol / h, of which benzene and cyclohexane are 75% and 25% (mol fraction) respectively. The benzene-cyclohexane system is separated by extractive distillation, the extractant is N,N-dimethylformamide, and the feed rate of the extractant is 300 kmol / h. In this embodiment, the extractant N,N-dimethylformamide and the benzene-cyclohexane system of the material to be separated are fed at the same position, and the separated extractant is not recycled; the extractant can also be fed into The feed position is set higher than the feed position of the substance to be separated. After the extractant is separated from the substance to be separated, it can be recycled, and only a small amount of fresh extractant needs to be added. N...

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Abstract

An internal energy integrated rectifying device for three-component separation comprises a rectifying tower with an inner tower body and an outer tower body, the outer tower body is a stripping section, the inner tower body is a rectifying section, and the inner tower body is provided with a partition plate; and through the arrangement of tower top gas phase and tower bottom liquid phase discharging and feeding paths in all tower bodies, heat exchangers, condensers, reboilers, compressors, throttling valves and the like and the arrangement of liquid distribution devices and silk screen condensation plates in the towers, heat and cold of the rectifying tower are fully utilized, and heat integration is achieved. When the device is used for rectification, the separation of three components can be realized in one tower body, meanwhile, the effective energy loss in the rectification process is reduced, and the condensation load and the reboiling load are reduced.

Description

technical field [0001] The invention relates to a rectification device, in particular to a rectification device with internal energy integration for three-component separation, and belongs to the technical field of rectification. Background technique [0002] Separation of the three-component mixture by rectification usually requires two rectification towers to be connected in series. Conventional separation usually adopts direct sequence and indirect sequence. is the opposite. In the traditional two-column distillation separation process, the back-mixing effect is unavoidable, and it is this effect that causes the high energy consumption required by the traditional sequence. Therefore, the research and development of new three-component separation and rectification energy-saving technology has great theoretical and practical significance, and will make a major contribution to the energy saving and emission reduction of the entire process industry. The dividing wall tower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/32
CPCB01D3/143B01D3/322
Inventor 胡珺薄德臣陈建兵高明张英
Owner CHINA PETROLEUM & CHEM CORP
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