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Control structure and control method of Kaibel dividing wall rectifying tower

A technology of dividing wall rectification tower and control structure, which is applied in the field of control structure and control of separating multi-component mixture in Kaibel dividing wall rectification tower, which can solve problems such as poor control effect and product purity deviation

Active Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above studies have proved that the Kaibel dividing wall distillation column can adopt a temperature control structure, and increasing the control loop of the liquid separation ratio or gas separation ratio can improve the control effect, but the control schemes mentioned in the current literature can only deal with the feed flow rate or composition When there is a disturbance of less than ±10% in the feed flow or components, the control effect is not good, and the product purity will have a large deviation

Method used

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  • Control structure and control method of Kaibel dividing wall rectifying tower
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  • Control structure and control method of Kaibel dividing wall rectifying tower

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 The control structure of a kind of Kaibel rectification column with dividing wall

[0036] figure 1 It is a schematic diagram of the structure of a Kaibel dividing wall distillation column for separating a mixture of quaternary components. In the figure, the area marked "1" is generally called the rectification section, the area marked "2" is generally called the pre-fractionation section, and the area marked "3" is generally called the side line section, marked " The 4" area is generally called the stripping section. Areas "1", "3", and "4" are collectively called the main tower. The mixture is fed from the pre-fractionation section, the light components are extracted from the top of the rectification section, the middle components are extracted from the side line section, and the heavy components are extracted from the tower kettle.

[0037] Take the separation of the quaternary mixture of benzene-toluene-xylene-mesitylene by using the dividing wall re...

Embodiment 2

[0045] Embodiment 2 A kind of control method of Kaibel rectification column with dividing wall

[0046] The quaternary mixture of benzene-toluene-xylene and mesitylene was separated by using the Kaibel dividing-wall rectification column with the control structure described in Example 1. The light component benzene is extracted from the top of the tower, the middle component toluene and xylene are extracted from the upper side line and the lower side line respectively, and the heavy component mesitylene is extracted from the tower kettle.

[0047] The TC2 control loop controls the temperature of the sensitive plate M6 in the rectification section through the return flow at the top of the tower, so as to ensure the purity of benzene at the top of the tower; the TC4 control loop controls the temperature of the sensitive plate M24 above the side line section through the output flow of the upper side line, so as to ensure the purity of the upper side line The product toluene purity...

Embodiment 3

[0059] The quaternary mixture of benzene-toluene-xylene-mesitylene is separated by using the Kaibel dividing-wall rectification column with control structure in Example 1. After the dividing wall rectification column operated stably for 2 hours, the concentration of toluene in the feed was disturbed by ±25%, from the original 25mol% to 31.25mol% or 18.75mol%. Figure 5 is the variation of the purity of the four products. It can be seen from the figure that under this control method, after the toluene component concentration in the feed is disturbed by ±25%, the purity of the toluene product returns to a stable level after about 8 hours, returning to 0.9902 and 0.9892, with a residual difference of less than 0.5%. The purity of other products is qualified. This shows that the control structure can well deal with the disturbance of ±25% incoming toluene concentration, and has good robustness and stability.

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Abstract

The invention discloses a control structure of a Kaibel dividing wall rectifying tower. The control structure comprises five control loops, namely (1) a temperature control loop for pressure compensation of a lower side line section, (2) a temperature control loop of an upper side line section, (3) a tower top temperature control loop, (4) a stripping section temperature control loop and (5) a pre-fractionation section temperature control loop. The invention further provides a control method for the Kaibel dividing wall rectifying tower based on the control structure and application of the Kaibel dividing wall rectifying tower to separation of a multi-component mixture. The control method provided by the invention can stably control the large disturbance of the feeding flow or components of the Kaibel dividing wall rectifying tower, and the purity of the four separated products is qualified.

Description

technical field [0001] The invention belongs to the field of chemical distillation process and automatic control, and relates to a control structure and a control method for separating a multi-component mixture in a Kaibel dividing wall distillation tower. Background technique [0002] Distillation is one of the most commonly used separation methods in the chemical production process. It is skilled in technology and widely used, but it generally has the problem of high energy consumption. Therefore, the energy-saving technology of the rectification unit has been receiving much attention. Divided-wall column (DWC) is a kind of thermally coupled distillation column, which can realize high-purity separation of multiple mixtures in one column, and has the significant advantages of saving energy consumption and reducing equipment costs. [0003] In 1987, on the basis of DWC, Kaibel proposed a rectification tower structure (Kaibel Divided-Wall Column, KDWC) that can separate quat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/42B01D3/14C07C7/04C07C15/04C07C15/06C07C15/08C07C15/02
CPCB01D3/42B01D3/14C07C7/04C07C15/04C07C15/06C07C15/08C07C15/02
Inventor 徐盛虎邱洁康伟青凌昊郑京禾邹圣武秦小虎王鹰
Owner CHINA PETROLEUM & CHEM CORP
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