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Batch distillation process for separating tert-butyl alcohol-methyl propionate azeotrope by mixed extractant

A technology of mixing extractant and methyl propionate, which is applied in the field of batch distillation technology, can solve the problems of high investment cost, difficulty in industrial application, high energy consumption cost, etc., to reduce production cost and energy consumption, improve product purity and Extraction efficiency and the effect of reducing energy consumption for separation

Inactive Publication Date: 2015-11-11
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 tert-butyl alcohol-methyl propionate azeotrope by mixed extractant

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Embodiment 1

[0018] A batch rectification process for separating tert-butanol-methyl propionate azeotrope with mixed extractant. The extraction agent is a mixture of ethylene glycol and 1-ethyl-3-methylimidazole diethyl phosphate ([emim][dep]); the raw material processing capacity is 1000kg, and the raw material composition is tert-butanol (40wt%) and propane The near azeotropic composition of methyl ester (60wt%), the ratio of the amount of extractant to the raw material feed is 4~4.8:1, the number of trays in the extractive distillation column is 60, and the feed position of the extractant is on the fifth tray. The reflux ratio is set to 4. When the temperature at the top of the tower reaches 44~45°C, the methyl propionate with a content of ≥99.5% is extracted to the product tank 1 with a reflux ratio of 5:1; When the methyl ester product content is less than 98% and the tower top temperature is higher than 50°C, stop adding the extractant, and extract the methyl propionate-tert-butanol ...

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 methyl propionate and tert-butanol products are both above 99.5%.

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Abstract

The present invention discloses a batch distillation process for separating tert-butyl alcohol-methyl propionate azeotrope by a mixed extractant. The process is characterized by using a mixture of ethylene glycol and an ionic liquid as an extractant, which is added from the upper end of an extractive distillation column; a tert-butyl alcohol-methyl propionate azeotrope is added to the kettle; by adjusting the reflux ratio, the quality of the product is controlled; and the product of methyl propionate, a methyl propionate-tert-butyl alcohol transition fraction, a tert-butyl alcohol products, and a tert-butyl alcohol-glycol transition fraction can be obtained from the top of the tower. The contents of products methyl propionate and tert-butyl alcohol are both higher than 99.5%; and the two transition fractions and bottom extractant can be recycled and treated in the next batch of materials. The process uses a batch vacuum distillation, has the advantages of simple equipment, less investment, flexible operation, low power consumption and high product quality, and is applicable to small and medium-scale production.

Description

technical field [0001] The invention relates to a batch rectification process for separating a tert-butanol-methyl propionate azeotrope with a mixed extractant, which belongs to the extraction and rectification technology of the tert-butanol-methyl propionate 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] Tert-butanol (tert-butanol): also known as 2-methyl-3 propanol, trimethylmethanol, the molecular formula is C 4 h 10 O, often used as a substitute for n-butanol, mainly used as paint and solvent. At the same time, tert-butanol can also be used as an additive and antiknock agent for internal combustion engine fuel, as well as a raw material for organic synthesis (mainly used as a raw material for the alkylation of tert-butyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/54C07C69/24C07C29/84C07C31/12
CPCC07C67/54C07C29/84
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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