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Operation control method of dividing wall tower

A technology of operation control and dividing wall tower, applied in the field of operation control of dividing wall tower, can solve the problems of difficult operation and control of dividing wall tower, difficult control of product quality and yield, poor stability, etc.

Active Publication Date: 2020-09-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] What the present invention is to solve is the technical problem of difficult operation and control, poor stability, and difficult control of product quality and yield in the prior art.

Method used

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  • Operation control method of dividing wall tower
  • Operation control method of dividing wall tower
  • Operation control method of dividing wall tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using the benzene / toluene / mixed xylene material as the raw material, its composition in weight percentage is 12.80% benzene+70.69% toluene+16.51% mixed xylene. Based on the feed flow rate of 80g / min, press figure 1 The illustrated dividing wall column operation control method is used to separate, obtain benzene product from the top of the column, obtain toluene product from the side line, and obtain mixed xylene product from the tower still. Wherein the total number of theoretical plates of the dividing wall column is 70, the number of theoretical plates of the common rectifying section is 15, the number of theoretical plates of the feed side and the product side of the dividing wall section is 35, and the raw materials from the feeding side 1 of the dividing wall section are The 23rd theoretical plate counted from top to bottom enters, and toluene is extracted from the 17th theoretical plate counted from top to bottom from the product side III of the wall section. The ...

Embodiment 2

[0037] Using the benzene / toluene / mixed xylene material as the raw material, its composition in weight percentage is 33.85% benzene+54.61% toluene+11.54% mixed xylene. Based on the feed flow rate of 80g / min, press figure 1 The dividing wall column operation control method is shown for separation, wherein the total theoretical plate number of the dividing wall column is 70, the theoretical plate number of the common rectifying section is 20, and the theoretical plate number of the feed side and product side of the dividing wall section is 70. 30, the raw material enters from the 17th theoretical plate counted from top to bottom from the feed side I of the sub-wall section, and the toluene is extracted from the 15th theoretical plate from the top to the bottom of the sub-wall section product side III, and the operating pressure is constant. The control temperature of the sensitive plate N1 on the feed side and the sensitive plate N2 on the product side of the wall section are 108...

Embodiment 3

[0039] Taking ethanol / isobutanol / n-amyl alcohol mixture as raw material, its composition in weight percentage is 12.80% ethanol+70.69% isobutanol+16.51% n-amyl alcohol. Based on the feed flow rate of 80g / min, press figure 1 The illustrated dividing wall column operation control method is used for separation, obtaining ethanol product from the top of the column, isobutanol product from the side line, and n-amyl alcohol product from the column still. The structural parameters of the dividing wall column are the same as those in Example 1, the operating pressure is normal pressure, and the control temperatures of the sensitive plate N1 on the feed side of the divided wall section and the sensitive plate N2 on the product side are 105.7 °C and 108.0 °C, respectively. The output, and the flow rate of the reflux liquid at the top of the tower are controlled to be 10.2g / min, 56.5g / min, 117.3g / min respectively, and the liquid levels of the tower top condensation tank, the liquid colle...

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Abstract

The invention relates to an operation and control method for a divided-wall column. The main objective of the invention is to overcome the technical problems of difficult operation and control, poor stability and hardly-controllable product quality and yield of conventional divided-wall columns. The operation and control method provided by the invention overcomes the above technical problems by controlling temperatures, flow rates and liquid levels in five control areas of the divided-wall column, i.e., a control area for raw material feeding, a control area for column-top reflux and extraction, a control area for liquid collection and distribution, a control area for side-line extraction and a control area for column-bottom extraction. The operation and control method can be applied to industrial production of the divided-wall column.

Description

technical field [0001] The invention relates to an operation control method of a dividing wall column, which can be used in the industrial production of the dividing wall column. Background technique [0002] Rectification is the most mature and widely used separation technology in petrochemical production, but the energy consumption of the rectification process is huge. It is estimated that 40-70% of the energy consumption in the chemical process is used for separation, and the energy consumption of 95% of them. In order to reduce the energy consumption of the rectification process, researchers at home and abroad have carried out extensive research, and the dividing wall column has received extensive attention as a typical rectification energy-saving equipment or process intensification and energy-saving technology. [0003] The dividing wall column is to install one or more vertical clapboards or clapboards with a certain length in a rectification column, and adopt a set ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14B01D3/42
CPCB01D3/14B01D3/42
Inventor 郭艳姿蔡立鑫陈亮
Owner CHINA PETROLEUM & CHEM CORP
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