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Process and Dynamic Control Scheme of Separation of Benzene and Isobutanol by Pressure Swing Distillation

A pressure swing rectification and isobutanol technology, which is applied in the dynamic control of the pressure swing rectification process, the pressure swing rectification separation process of benzene and isobutanol mixture and the field of dynamic control scheme, which can solve the problem that the rectification tower is not given. The types of separated substances, the difficulty of dynamic control of double-tower pressure swing distillation, etc. are far away, so as to achieve the effect of ensuring purity, improving product purity and yield, and efficient separation

Active Publication Date: 2020-07-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent (CN201006332Y) and patent (CN106110700A) disclose a rectification tower control system, the control system can only achieve single tower control, and does not give the rectification tower specific separation substance category, and the application of the double tower variable pressure The Difficulty of Distillation Dynamic Control

Method used

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  • Process and Dynamic Control Scheme of Separation of Benzene and Isobutanol by Pressure Swing Distillation
  • Process and Dynamic Control Scheme of Separation of Benzene and Isobutanol by Pressure Swing Distillation
  • Process and Dynamic Control Scheme of Separation of Benzene and Isobutanol by Pressure Swing Distillation

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Experimental program
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Embodiment 1

[0037] After the initial operation of each controller, the set value is automatically input, and the set value is used to determine the range of the intermediate value, and the closed loop is used as a test method. Add ± 25% feed flow perturbation on the basis of the initial steady-state process, that is, after the feed flow is 100kmol / h (20% isobutanol, containing 80% benzene) after the stable operation of the process, add +25% ( 125 kmol / h) flow disturbance and -25% (75 kmol / h) flow disturbance.

[0038] After the disturbance was added, the purity of isobutanol at the bottom of the atmospheric column and the purity of benzene at the top of the high-pressure column were recorded to test the control performance of the dynamic control system. The dynamic response diagram of the flow disturbance is attached figure 2 As shown, the solid line is +25% feed flow disturbance, and the dashed line is -25% feed flow disturbance.

[0039] When the feed is disturbed by ±25%, the concen...

Embodiment 2

[0041] After the initial operation of each controller, the set value is automatically input, and the set value is used to determine the range of the intermediate value, and the closed loop is used as a test method. Add ±25% feed composition disturbance on the basis of the initial steady-state process, that is, add isobutanol+ 25% (25% isobutanol, containing 75% benzene) composition perturbation and isobutanol-25% (15% isobutanol, containing 85% benzene) composition perturbation.

[0042] After the disturbance was added, the purity of isobutanol at the bottom of the atmospheric column and the purity of benzene at the top of the high-pressure column were recorded to test the control performance of the dynamic control system. The dynamic response diagram of the flow disturbance is attached image 3 As shown, the solid line is +25% feed composition disturbance, and the dashed line is -25% feed composition disturbance.

[0043] When a disturbance of ± 25% is added to the feed compo...

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Abstract

The invention discloses a variable pressure rectification process for separating a benzene and isobutanol mixture and a dynamic control plan. A to be separated system is characterized in that a lowest azeotrope is formed under low pressure, and a highest azeotrope is formed under high pressure; firstly the lowest azeotrope is separated at an atmospheric tower, and a tower top product enters a pressurized tower for secondary rectification to separate the highest azeotrope. By using a rule that an azeotropy property of benzene and isobutanol changes along with pressure, the dynamic plan capable of realizing stable control on the variable pressure rectification process for separating a benzene and isobutanol azeotropy system is invented, can be used for better treating plus / minus 25 percent feed flow rate disturbance and plus / minus 25 percent feed composition disturbance, and has relatively strong robustness and stability.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and specifically relates to a process and a dynamic control scheme for separating benzene and isobutanol mixture through pressure swing rectification, especially suitable for pressure swing rectification with normal pressure first, then high pressure and high pressure tower bottom circulation Dynamic control of the process. Background technique [0002] In the industry, a large amount of benzene-isobutanol mixture is produced in the production process of certain paints, resulting in a great waste of resources. The effective separation of benzene and isobutanol has great economic benefits for solvent recovery and resource utilization. The azeotropic behavior of benzene and isobutanol changes as the pressure increases, that is, it is the lowest azeotrope in the low pressure range and the highest azeotrope in the high pressure range. Adopting the pressure swing re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C15/04C07C29/80C07C31/12
CPCC07C7/04C07C29/80C07C15/04C07C31/12
Inventor 朱兆友贾慧刘晓斌潘相帅王英龙
Owner QINGDAO UNIV OF SCI & TECH
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