Batch distillation process for separating isopropanol-isopropyl acetate azeotrope through mixed extraction agent

A technology of isopropyl acetate and mixed extractant, applied in the field of isopropyl alcohol-isopropyl acetate azeotrope extraction and rectification, can solve problems such as high investment cost, high energy consumption cost, difficult industrial application, etc. The effect of production cost and energy consumption, reduction of separation energy consumption, improvement of product purity and extraction efficiency

Inactive Publication Date: 2015-11-18
UNIV OF JINAN
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  • Abstract
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  • Application Information

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Problems solved by technology

Compared with traditional solvents, although ionic liquids have many advantages as extraction agents, the high investment cost makes their industrial application very difficult
CN103193590A A method for continuous extraction and separation of mixed alcohol-water, CN102627556A A method for extracting and rectifying separation of ethyl formate-ethanol-water, all using ethylene glycol as the extractant; CN103193590A Method for separating acetic acid-water by ionic liquid extraction and rectification Ionic liquid is used as the extraction agent, and the above inventions all adopt the atmospheric distillation process, so the energy consumption cost is relatively large

Method used

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  • Batch distillation process for separating isopropanol-isopropyl acetate azeotrope through mixed extraction agent

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Embodiment 1

[0018] A batch rectification process for separating isopropanol-isopropyl acetate azeotrope with mixed extractant. The extractant is selected from ethylene glycol and 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) (20wt%); the raw material processing capacity is 1000kg, the raw material composition is a near-azeotropic composition of isopropanol (55wt%) and isopropyl acetate (45wt%), and the ratio of extraction agent dosage to raw material feed is 3~5 : 1, the number of extraction and rectification column trays is 60, and the extraction agent feeding position is at the 5th tray. The reflux ratio is set to 4. When the tower top temperature reaches 75~76°C, the isopropanol with a content ≥99.5% is extracted to the product tank 1 with a reflux ratio of 5:1; when the isopropanol extracted from the top of the extractive distillation tower When the alcohol product content is less than 98% and the tower top temperature is higher than 80°C, stop adding the extractant, ...

Embodiment 2

[0020] As the extractant, ethylene glycol and 1-butyl-3-methylimidazolium dibutyl phosphate ([bmim][dbp]) were selected, and other conditions were as in Example 1. The purity of the obtained isopropyl acetate and isopropanol products is more than 99.5%.

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Abstract

The invention discloses a batch distillation process for separating isopropanol-isopropyl acetate azeotrope through a mixed extraction agent. The batch distillation process is characterized in that a mixture of ethylene glycol and an ionic liquid is selected to serve as the extraction agent and is added from the upper end of an extraction distillation tower, isopropanol-isopropyl acetate azeotrope is added to a kettle, the quality of a product is controlled by regulating the reflux ratio, and an isopropanol product, an isopropanol-isopropyl acetate interim fraction, an isopropyl acetate product and an isopropyl acetate-ethylene glycol interim fraction are sequentially obtained from the top of the tower. The content of isopropyl acetate and the content of the isopropanol product are both higher than 99.5%, and the two interim fractions and the extraction agent at the bottom of the tower can be recovered and used for processing of the next batch of materials. Batch pressure-reduction distillation is adopted, and the batch distillation process has the advantages of simple equipment, few investment, flexible operation, low energy consumption, high product quality and the like and is suitable for medium-scale and small-scale production.

Description

technical field [0001] The invention relates to a batch rectification process for separating isopropanol-isopropyl acetate azeotrope with a mixed extractant, which belongs to the extraction and rectification technology of isopropanol-isopropyl acetate azeotrope. The feature of this process is that the extractant is a mixture added with ionic liquid, and the operation mode is intermittent operation under reduced pressure, which has the advantages of simple operation, recyclable extractant, and low energy consumption. Background technique [0002] Isopropanol (isopropanol), also known as dimethyl methanol, 2-propanol, also known as IPA in the industry, the molecular formula is C 3 h 8 O, the chemical properties are similar to ethanol and propanol, but it has the characteristics of secondary alcohol, and can dissolve various organic substances such as alkaloids, rubber, shellac, mountain resin, rosin, frankincense, and synthetic resins. In addition, it is also an excellent de...

Claims

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Application Information

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IPC IPC(8): C07C29/84C07C29/80C07C31/10C07C29/82C07C67/54C07C69/14
CPCC07C29/84C07C29/80C07C29/82C07C67/54C07C31/10C07C69/14
Inventor 姜占坤刘顺江孙国新冯加亮
Owner UNIV OF JINAN
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