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Batch distillation process for separating isopropanol-methyl isobutyrate azeotrope through mixed extraction agent

A technology of methyl isobutyrate and mixed extractant, applied in the field of batch rectification process, can solve the problems of high investment cost, high energy consumption cost, difficult industrial application, etc., and achieves reduction of production cost and energy consumption, and reduction of separation energy. consumption, improve product purity and extraction efficiency

Inactive Publication Date: 2015-11-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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-methyl isobutyrate azeotrope through mixed extraction agent

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Embodiment 1

[0018] A batch rectification process for separating isopropanol-methyl isobutyrate azeotrope with mixed extractant. The extractant is selected from ethylene glycol and N-ethylpyridine tetrafluoroborate ([Epy][BF 4 ]) (20wt%); the raw material processing capacity is 1000kg, the raw material composition is a near-azeotropic composition of isopropanol (63wt%) and methyl isobutyrate (37wt%), and the ratio of extraction agent dosage to raw material feed is 3~ 5:1, the number of trays of the extractive distillation column is 60, and the feeding position of the extractant is on the fifth tray. The reflux ratio is set to 4, and when the tower top temperature reaches 57~58°C, methyl isobutyrate with a content of ≥99.5% is extracted to the product tank 1 with a reflux ratio of 5:1; When the product content of methyl isobutyrate is less than 98% and the tower top temperature is higher than 63°C, stop adding the extractant, and extract the methyl isobutyrate-isopropanol transition fracti...

Embodiment 2

[0020] The extractant is selected from ethylene glycol and N-ethylpyridine hexafluorophosphate ([Epy][PF 6 ]), other conditions are as in embodiment one. The purity of the obtained methyl isobutyrate and isopropanol products are all above 99.5%.

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Abstract

The invention discloses a batch distillation process for separating isopropanol-methyl isobutyrate 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-methyl isobutyrate azeotrope is added to a kettle, the quality of a product is controlled by regulating the reflux ratio, and an methyl isobutyrate product, a methyl isobutyrate-isopropanol interim fraction, an isopropanol product and an isopropanol-ethylene glycol interim fraction are sequentially obtained from the top of the tower. The content of methyl isobutyrate 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 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-methyl isobutyrate azeotrope with a mixed extractant, which belongs to the extraction and rectification technology of isopropanol-methyl isobutyrate 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/84C07C31/10C07C29/80C07C67/54C07C69/24
CPCC07C29/84C07C29/80C07C67/54C07C31/10C07C69/24
Inventor 姜占坤刘顺江孙国新冯加亮
Owner UNIV OF JINAN
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