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Isopropanol-propyl formate azeotrope rectification separation method based on mixed solvent as extracting agent

A technology of propyl formate and mixed solvent, which is applied in the field of special rectification, isopropanol-propyl formate azeotrope rectification and separation, can solve the problems of high energy consumption cost, high investment cost, difficult industrial application, etc. The effect of reducing production cost and energy consumption, reducing energy consumption for separation, improving product purity and extraction efficiency

Inactive Publication Date: 2015-10-28
UNIV OF JINAN
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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-propyl formate azeotrope rectification separation method based on mixed solvent as extracting agent

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Embodiment 1

[0021] Based on the isopropanol-propyl formate azeotrope rectification separation method based on mixed solvent as extractant. The extractant is selected from ethylene glycol (80wt%) and 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) (20wt%), the dosage is 1500kg / h; the raw material processing capacity is 1000kg / h, and the raw material composition is a near azeotropic composition of isopropanol (36.5wt%) and propyl formate (63.5wt%). 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 as 2, the extraction rate at the top of the tower is 635kg / h, and the purity of propyl formate obtained is 99.7%. The number of trays in the extraction agent recovery tower is 30, the feeding position of stream ② is the 20th tray, the reflux ratio is 1.5, the extraction rate at the top of the tower is 365kg / h, and the pur...

Embodiment 2

[0023] The extractant is selected from ethylene glycol (90wt%) and 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF 6 ]) (10wt%), the dosage is 2500kg / h, the number of plates in the extractive distillation column is 70, the reflux ratio is 4, and other conditions are the same as in Example 1. The purity of the obtained propyl formate and isopropanol products is more than 99.5%.

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Abstract

An isopropanol-propyl formate azeotrope rectification separation method based on a mixed solvent as an extracting agent is provided. The isopropanol-propyl formate extraction rectification process adopts two towers of an extraction rectification tower and an extracting agent recovery tower, and adopts continuous decompression operations; the extracting agent is added from a tower plate at the upper end of the extraction rectification tower, and raw materials are added from a tower plate at the lower end of the extraction rectification tower; a steam at the tower bottom of the extraction rectification tower continuously enters the extracting agent recovery tower, and a feeding position is at the middle of the tower; the extracting agent at the tower bottom of the extracting agent recovery tower is used as a supplement of a solvent of the extraction rectification tower. The method has the biggest characteristics that the mixed extracting agent composed of a traditional solvent and an ionic liquid is adopted for extraction, and the method has great advantages in energy consumption, environmental pressure and product purity and is especially suitable for large-scale industrialized application.

Description

technical field [0001] The invention relates to an isopropanol-propyl formate 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, an...

Claims

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Application Information

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IPC IPC(8): C07C29/84C07C31/10C07C67/54C07C69/06
CPCC07C29/84C07C67/54C07C31/10C07C69/06Y02P20/54
Inventor 姜占坤刘顺江孙国新张启龙冯加亮
Owner UNIV OF JINAN
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