Isopropanol-methyl isobutyrate azeotrope distillation separation method by using mixed solvent as the extraction solvent

A technology of methyl isobutyrate and mixed solvents, which is applied in the rectification and separation of isopropanol-methyl isobutyrate azeotrope, and in the field of special rectification, which can solve high investment costs, difficulties in industrial application, and high energy consumption costs and other issues, to achieve the effect of reducing production cost and energy consumption, improving product purity and extraction efficiency, and reducing energy consumption for separation

Inactive Publication Date: 2015-11-11
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
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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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  • Isopropanol-methyl isobutyrate azeotrope distillation separation method by using mixed solvent as the extraction solvent

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Embodiment 1

[0021] A method for rectifying and separating isopropanol-methyl isobutyrate azeotrope based on a mixed solvent as an extractant. The extractant is selected from ethylene glycol (80wt%) and N-ethylpyridine tetrafluoroborate ([Epy][BF 4 ]) (20wt%), the dosage is 4000kg / h; the raw material processing capacity is 1000kg / h, and the raw material composition is a near azeotropic composition of isopropanol (63wt%) and methyl isobutyrate (37wt%). The number of trays in the extractive distillation column is 60, the feeding position of the extractant is on the 5th tray, and the feeding position of the raw material is on the 45th tray. The reflux ratio is set at 2, the extraction rate at the top of the tower is 370kg / h, and the purity of methyl isobutyrate obtained is 99.5%. The number of trays in the extraction agent recovery tower is 50, the feed position of stream ② is the 30th tray, the reflux ratio is 4, the extraction rate at the top of the tower is 630kg / h, and the purity of isop...

Embodiment 2

[0023] The extractant is selected from ethylene glycol (90wt%) and N-ethylpyridine hexafluorophosphate ([Epy][PF 6 ]) (10wt%), the dosage is 5000kg / h, the number of plates in the extractive distillation column is 65, the reflux ratio is 3, and other conditions are the same as in Example 1. The purity of the obtained methyl isobutyrate and isopropanol products are all above 99.5%.

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Abstract

The invention provides an isopropanol -methyl isobutyrate azeotrope distillation separation method by using a mixed solvent as the extraction solvent. An isopropyl-methyl isobutyrate extractive distillation process consists of an extractive distillation tower and an extraction solvent recovery tower, and adopts continuous pressure reduction operation. The extraction solvent is added from the upper tray of the extractive distillation tower, and the raw material is added from the lower tray of the extractive distillation tower; the stream at the bottom of the extractive distillation tower is continuously fed into the extraction solvent recovery tower, and the feed position is on the middle of the tower; and the bottom extraction solvent of the extraction solvent recovery co tower is used as a complement to solvent in the extractive distillation tower. The method is characterized by choosing a mixed extraction solvent of a conventional solvent and ionic liquid, has huge advantages in the energy consumption, environmental pressure and product purity, and is especially suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to an isopropanol-methyl isobutyrate azeotrope rectification separation method based on a mixed solvent as an extractant, belonging to the special rectification technology category. The feature of the process is that the extractant is a mixture added with ionic liquid, the extractant can be recycled, the energy consumption is low, and the product quality is higher. 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 dewaxing agent for refined lubricating oil, an extractant for cottonseed oil, an antifreeze agent, a dehydrator...

Claims

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Application Information

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IPC IPC(8): C07C67/54C07C69/24C07C29/84C07C31/10
CPCC07C29/84C07C67/54C07C69/24C07C31/10Y02P20/54
Inventor 姜占坤刘顺江孙国新张启龙
Owner UNIV OF JINAN
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