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An extractive distillation process for separating ternary complex azeotropic mixture cyclohexane/n-propanol/water

A technology of azeotropic mixture and extractive distillation, which is applied in the field of distillation and purification in the chemical industry, can solve problems such as separation difficulties, and achieve the effect of simple process, low price and high purity

Active Publication Date: 2022-06-17
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for extracting and rectifying the separation of the ternary complex azeotropic mixture cyclohexane / n-propanol / water, which solves the problem of difficult separation of the cyclohexane / n-propanol / water system due to azeotropy in pairs

Method used

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  • An extractive distillation process for separating ternary complex azeotropic mixture cyclohexane/n-propanol/water

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The feed flow rate was 100 kmol / h, the feed temperature was 25°C, the mole fraction of cyclohexane was 20%, the mole fraction of n-propanol was 20%, and the mole fraction of water was 60%. The number of plates in the cyclohexane extractive distillation column is 30, the raw material is fed from the 25th plate, the extractant glycerol is fed from the 5th plate, the feed amount of the extractant is 30kmol / h, and the reflux ratio is 0.5; The operating pressure of the propanol extractive distillation column is 1 atm, the number of trays is 40, the feed position is the 35th block, the extraction agent feed position is the 10th block, the extraction agent feed rate is 45kmol / h, and the reflux ratio is 0.5 ; The pressure of the extraction agent recovery tower is 0.2atm, the number of trays is 20, the feed position is the 10th, and the reflux ratio is 1. After separation, the cyclohexane product concentration is 99.9%, the ethanol product concentration is 99.9%, and the water p...

Embodiment 2

[0028] The feed flow rate is 150 kmol / h, the feed temperature is 25°C, the mole fraction of cyclohexane is 20%, the mole fraction of n-propanol is 20%, and the mole fraction of water is 60% in the feed stream. The number of plates in the cyclohexane extraction and rectification tower is 34, the raw material is fed from the 29th plate, the extractant glycerol is fed from the 7th plate, the feed amount of the extractant is 45kmol / h, and the reflux ratio is 0.5; The operating pressure of the alcohol extraction distillation column is 1 atm, the number of trays is 50, the feed position is the 38th block, the extraction agent feed position is the 10th block, the extraction agent feed rate is 70kmol / h, and the reflux ratio is 1; The pressure of the agent recovery tower is 0.2 atm, the number of trays is 25, the feeding position is the 10th block, and the reflux ratio is 1. After separation, the cyclohexane product concentration is 99.96%, the ethanol product concentration is 99.9%, a...

Embodiment 3

[0030] The feed flow rate was 200 kmol / h, the feed temperature was 25°C, the mole fraction of cyclohexane was 20%, the mole fraction of n-propanol was 20%, and the mole fraction of water was 60% in the feed stream. The number of plates in the cyclohexane extractive distillation column is 37, the raw material is fed from the 32nd plate, the extractant glycerol is fed from the 8th plate, the feed amount of the extractant is 50kmol / h, and the reflux ratio is 0.5; The operating pressure of the alcohol extraction distillation column is 1 atm, the number of trays is 55, the feed position is the 48th block, the extraction agent feed position is the 11th block, the extraction agent feed rate is 100kmol / h, and the reflux ratio is 1.5; The pressure of the agent recovery tower is 0.2atm, the number of trays is 36, the feeding position is the 10th block, and the reflux ratio is 2; after separation, the concentration of cyclohexane product is 99.9%, the concentration of ethanol product is 9...

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Abstract

The invention relates to an extraction and rectification process for separating the ternary complex azeotropic mixture cyclohexane / n-propanol / water. The process consists of two extractive distillation columns separating the cyclohexane / n-propanol / water mixture and an extractant recovery column. Using glycerin as the extractant, cyclohexane / n-propanol / water first enters the cyclohexane extractive distillation column for extraction and separation, and the top of the cyclohexane extractive distillation column obtains high-purity cyclohexane, and cyclohexane extractive distillation The material at the bottom of the tower enters the n-propanol extractive distillation tower for separation. High-purity n-propanol is obtained from the top of the n-propanol extraction and rectification tower, and the bottom material enters the extractant recovery tower for separation of extractant and water. The method has the advantages of low energy consumption, simple process, high purity of cyclohexane and n-propanol after separation, etc., and the used extractant glycerin is non-toxic and environmentally friendly, and the price is also low.

Description

【Technical field】 [0001] The invention belongs to the field of rectification and purification in the chemical industry, and particularly relates to a process for extractive rectification and separation of cyclohexane / n-propanol / water. 【Background technique】 [0002] Cyclohexane is commonly used for degreasing, paint stripping, and extraction of essential oils because of its low toxicity. In addition, it is commonly used as a solvent for rubber, paints, varnishes, and as a thinner for adhesives. n-Propanol is an important solvent and intermediate in organic synthesis. It can be used to synthesize biodiesel that helps reduce greenhouse gas emissions, and n-propanol also has important applications in medicine, coatings and other fields. In the actual production process, waste water containing cyclohexane and n-propanol will be generated. Cyclohexane / n-propanol / water is a complex three-element two-two azeotrope system, and the efficient separation of the mixture cannot be achie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/08C07C13/18C07C29/84C07C31/10
CPCC07C7/08C07C29/84C07C2601/14C07C13/18C07C31/10
Inventor 李鑫孟大朋孟凡庆齐建光王英龙
Owner QINGDAO UNIV OF SCI & TECH
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