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Extractive distillation process of propionic acid-water binary azeotrope and dynamic control scheme

A technology of extractive distillation and binary azeotrope, which is applied in the field of pressure swing extraction, rectification and separation of propionic acid-water binary azeotrope and its dynamic control, can solve the problems of propionic acid-water separation difficulties, and achieve Solve the effect of difficult to separate, robust dynamic control

Inactive Publication Date: 2022-08-05
QINGDAO UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for separating binary propionic acid-water by pressure-swing extraction rectification, solves the difficult problem of propionic acid-water separation caused by azeotropy, proposes a dynamic control scheme capable of resisting large process fluctuations, and realizes extraction fine Robust control of the distillation process

Method used

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  • Extractive distillation process of propionic acid-water binary azeotrope and dynamic control scheme
  • Extractive distillation process of propionic acid-water binary azeotrope and dynamic control scheme

Examples

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Embodiment 1

[0026] After the controller is initialized, the setting value is automatically input, and the set value is determined by the set value as the intermediate value. The test method is used with a closed loop circuit. Add ± 20 % feeding flow disturbance on the basis of the initial steady -state process, that is, the feed flow is 7200kg / h and 4800kg / h (water 20WT %, containing propionate 80WT %). After the disturbance is added, the purity of the water of the T1 tower top product water and the purity of the propionic acid of the T2 tower top product are used to test the control performance of the dynamic control system. Dynamic response of flow disturbances is like figure 2 In the first and second small figures, the black real line is+20 % flow disturbance, and the black solid line is -20 % flow disturbance. When the inlet adds ± 20 % flow disturbance, the purity of water and propionic acid recovers to stability within 10 hours after slight fluctuations. It shows that the control system...

Embodiment 2

[0028] Based on the initial steady-state process, add ± 20 % feeding composition to disturb. The feed flow is 6000kg / h,+20 % composition to 36WT % of water, and propionate 64WT %; %, 96WT %. After the disturbance is added, the purity of the water of the T1 tower top product water and the purity of the propionic acid of the T2 tower top product are used to test the control performance of the dynamic control system. Dynamic response diagram of flow disturbances is attached figure 2 The third and fourth small diagram, the black real line is composed of+20 %, and the black solid line is -20 % to form a disturbance. When the feed adding a+20 % disturbance, the purity of the water fluctuates very small, the purity of the propionic acid fluctuates large, but it can be restored to stability. Under the disturbance of -20 % In stability, the purity of propionic acid does not fluctuate. It shows that the control system can handle ± 20 % of the inlet flow disturbance, which has good robustnes...

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Abstract

The invention relates to an extractive distillation process of a propionic acid-water binary azeotrope and a dynamic control scheme. The invention relates to a pressure swing extractive distillation process for separating a binary azeotropic mixture propionic acid-water and a dynamic control scheme of the pressure swing extractive distillation process. The separation process consists of a propionic acid-water mixture extractive distillation tower and an extractant recovery tower. Ethylene glycol is used as an extraction agent, propionic acid-water firstly enters a water extraction rectifying tower for extraction separation, 99.9 wt% of water is obtained at the top of the water extraction rectifying tower, materials at the bottom of the water extraction rectifying tower enter an extraction agent recovery rectifying tower for separation, 99.9 wt% of propionic acid is obtained at the top of the extraction agent recovery rectifying tower, and high-purity ethylene glycol is obtained at the bottom of the extraction agent recovery rectifying tower. The dynamic control scheme provided by the invention can well process + / -20% of composition and flow disturbance, and has relatively strong robustness and stability.

Description

【Technical Field】 [0001] The present invention is a field of refreshment and purification in the chemical industry, which specifically involves the transformer extraction separation separation process and its dynamic control methods that involve propionic acid-water dual-boiled. 【Background technique】 [0002] As a basic chemical, proparic acid can be used as food preservatives, solvents and plasticizers. Whether as a fermentation raw material or industrial waste water, the separation of propionic acid and water is of great significance. However, there is a co -boiling object between propionic acid and water, which seriously limits the improvement of the purity of propionic acid. Due to confidentiality problems, there are currently no public reports on proparic acid and water separation. [0003] Several special distillation methods, such as co -boiling refined distillation, transformer distillation and extraction of essential distillation have been widely used in the separation ...

Claims

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Application Information

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IPC IPC(8): C07C51/44C07C53/122
CPCC07C51/44C07C53/122Y02P20/10
Inventor 朱兆友张艳丽钟立梅齐建光杨晶巍
Owner QINGDAO UNIV OF SCI & TECH
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