Batch extractive distillation and separation method for ethanol-benzene azeotrope

An azeotropic mixture, extractive distillation technology, applied in distillation purification/separation, preparation of organic compounds, chemical instruments and methods, etc., can solve problems such as unseen data, and achieve the effect of flexible operation and low investment in equipment costs

Inactive Publication Date: 2013-10-16
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

There are many articles and patents on extractive distillation, but there is no published information on extractive distillation and separation of ethanol-benzene azeotropic system

Method used

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  • Batch extractive distillation and separation method for ethanol-benzene azeotrope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: Using a batch extraction and rectification device, put 500 L of ethanol-benzene azeotropic mixture (including 70% benzene and 30% ethanol, both in mass percentages) in the heating kettle, and the selected extraction agents for the test are 1, 2, 3 -Trichloropropane, turn on the heat source of the heating kettle and the cold source of the condenser, after a period of reflux at the top of the extraction and rectification tower, the temperature at the top of the tower is stable, add the extractant, the feed position of the extractant is near the top of the tower, control the addition of the extractant The speed is 500 L / h, total reflux operation, when the temperature at the top of the extractive distillation tower is 78-78.5 ° C, the ethanol content in the distillate is ≥ 99%, and the reflux ratio is 3:1, and the output speed is 200 L / h. When the temperature at the top of the extractive distillation tower is 78.5-82.5°C, take out the ethanol-benzene transition ...

Embodiment 2

[0010] Embodiment 2: The experimental device and operation method are the same as in Embodiment 1, and the extractant is 1,2-dichloropropane.

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Abstract

The invention discloses a batch extractive distillation and separation method for ethanol-benzene azeotrope, and belongs to the separation technology of ethanol-benzene azeotrope. The method adopts halogenated hydrocarbon or aromatic hydrocarbon, which contains two or more halogen substituents such as 1,2-dichloropropane, 1,2,3-trichloropropane, o dichlorobenzene, and 1,2,3-trichloro-benzenes, as the extractant. Operation condition of extractive distillation column is that the mass ratio of extractant to overhead is in the range of 0.5:1 to 10:1. Ethanol, ethanol-benzene transition section I, benzene, and benzene-benzene extractant transition section II are respectively extracted from the top of the extractive distillation column by controlling different temperature and different reflux ratio of the top of the extractive distillation column. When the composition of the extractant in the bottom of the column meets the requirement, the extractant is pumped into a high-position storage tank for recycling. The batch extractive distillation and separation method for ethanol-benzene azeotrope has the advantages that ethanol-benzene azeotropic system is broken by extractant, so high-pure ethanol and benzene products are extracted, operation of single column is simple, and equipment cost is low.

Description

technical field [0001] The invention relates to an intermittent extraction and rectification separation method of ethanol-benzene azeotropic mixture, which belongs to the separation technology of ethanol-benzene azeotropic mixture. Background technique [0002] Extractive distillation is a special distillation separation technology, which is suitable for the separation of azeotropic systems. The purpose of separation is achieved by continuously adding extractant to the top of the rectification tower to change the relative volatility between the original components. Batch extractive distillation combines the advantages of batch distillation and extractive distillation. It is flexible in operation and can separate multiple components through one tower. The equipment investment is small, and it is suitable for the separation of azeotropic and near-boiling systems in small batches. The chemical structural formula of ethanol is: CH 3 CH 2 OH, widely used in industry. The etha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/84C07C15/04C07C7/08
Inventor 姜占坤袁美龙孙国新
Owner UNIV OF JINAN
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