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A method for separating n-hexane and ethyl acetate mixture by extractive distillation

A technology of ethyl acetate, extraction and rectification, applied in chemical instruments and methods, distillation purification/separation, preparation of organic compounds, etc., can solve the problem of unsuitable for large-scale industrial production, difficult to obtain ionic liquid, and no experimental results, etc. problems, to achieve the effects of high product purity and yield, clean production, and low energy consumption

Active Publication Date: 2016-07-20
ZHEJIANG UNIV
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Problems solved by technology

There are also studies that use ionic liquids as extraction agents to extract and separate n-hexane and ethyl acetate, but there are problems that ionic liquids are not easy to obtain and the price is high, so they are not suitable for large-scale industrial production
In addition, the extraction and rectification separation process of the mixture of n-hexane and ethyl acetate has also been paid attention to. The simulation results show that using N-methylpyrrolidone or N,N-dimethylformamide as the extraction agent can obtain good separation effect, but No experimental results were given

Method used

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  • A method for separating n-hexane and ethyl acetate mixture by extractive distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0015] In an extractive distillation column with an internal diameter of 50mm and 60 theoretical plates, the mixture of n-hexane and ethyl acetate (80% and 20% by mass) enters the 40th theoretical plate at a rate of 5ml / min. Tower, the mixture of extractant dimethyl sulfoxide and N,N-dimethylacetamide (the mass percentage of dimethyl sulfoxide is 20%) is in the The 20th theoretical plate enters the tower, and the reflux ratio is controlled to be 1. Normal hexane is extracted from the top of the tower at a rate of 4.2ml / min, and the purity is 99.8%. The theoretical plate enters the extraction agent recovery tower (inner diameter 50mm, equipped with 15 theoretical plates), the reflux ratio is controlled to be 3, and ethyl acetate is withdrawn from the top of the tower at a rate of 0.8ml / min, with a purity of 99.9%. It is recovered from the bottom of the tower and recycled.

Embodiment 2

[0017] In an extractive distillation column with an internal diameter of 50 mm and 48 theoretical plates, the mixture of n-hexane and ethyl acetate (70% and 30% by mass) enters the 33rd theoretical plate at a rate of 5 ml / min. Tower, the mixture of extractant dimethyl sulfoxide and N,N-dimethylacetamide (the mass percentage of dimethyl sulfoxide is 30%) is in the The 8th theoretical plate enters the tower, and the control reflux ratio is 2. Normal hexane is extracted from the top of the tower at a rate of 3.8ml / min, and the purity is 99.9%. The theoretical plates enter the extraction agent recovery tower (50mm inner diameter, equipped with 15 theoretical plates), the reflux ratio is controlled to be 3, and ethyl acetate is extracted from the top of the tower at a rate of 1.2ml / min, with a purity of 99.7%. It is recovered from the bottom of the tower and recycled.

Embodiment 3

[0019] In an extractive distillation column with an internal diameter of 50 mm and 48 theoretical plates, the mixture of n-hexane and ethyl acetate (60% and 40% by mass) enters the 33rd theoretical plate at a rate of 5 ml / min. Tower, the mixture of extractant dimethyl sulfoxide and N,N-dimethylacetamide (the mass percentage of dimethyl sulfoxide is 45%) is in the The 8th theoretical plate enters the tower, the control reflux ratio is 3, normal hexane is extracted from the top of the tower at a rate of 3.4ml / min, and the purity is 99.8%. The theoretical plates enter the extraction agent recovery tower (50mm inner diameter, equipped with 25 theoretical plates), the reflux ratio is controlled to be 2, and ethyl acetate is extracted from the top of the tower at a rate of 1.6ml / min, with a purity of 99.6%. It is recovered from the bottom of the tower and recycled.

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Abstract

The invention discloses a method for separating n-hexane and ethyl acetate mixture by extractive distillation. It uses the mixture of dimethyl sulfoxide and N,N-dimethylacetamide as the extractant, and the mixture of n-hexane and ethyl acetate to be separated enters the 30-60 theoretical board from the 15th-40th theoretical board In the extractive distillation tower, the extractant enters from the 6th-20th theoretical plate, n-hexane is extracted from the top of the extractive distillation tower, and the extractant and ethyl acetate are extracted from the bottom of the extractive distillation tower from the 10th-20th block The theoretical plate enters the extraction agent recovery tower equipped with 15-30 theoretical plates, ethyl acetate is extracted from the top of the extraction agent recovery tower, and the extractant is recovered from the bottom of the extraction agent recovery tower and then recycled. The invention has the advantages of low energy consumption, high product purity and yield, simple process, safety, environmental protection and no pollution, and can realize clean production.

Description

technical field [0001] The invention relates to a method for separating n-hexane and ethyl acetate mixture, in particular to a method for separating n-hexane and ethyl acetate mixture by extractive distillation. Background technique [0002] n-Hexane has excellent solubility and quick-drying properties. It is a chemical solvent with excellent properties. It is widely used in rubber, paint, paint, artificial leather and pharmaceutical fields. It is mainly used as a solvent for the polymerization of olefins such as propylene, and as a solvent for rubber and paint. , extractant of edible vegetable oil, diluent of pigment, etc. Ethyl acetate is also a low-toxicity solvent widely used in industry. It is mainly used as a binder, extractant, extractant, and plays an important role in the production process of coatings, inks, medicines, spices and other products. [0003] In chemical production, a mixture of n-hexane and ethyl acetate is often produced. In order to reduce productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/15C07C7/08C07C69/14C07C67/54
Inventor 袁慎峰尹红高孜孜陈志荣
Owner ZHEJIANG UNIV
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