New process for separating methanol-propyl formate azeotrope through extractive distillation

A technology of extractive distillation and propyl formate, which is applied in the field of extractive distillation and separation of methanol-propyl formate azeotrope, can solve problems such as equipment corrosion, and achieve the effects of reducing pollution, reducing costs, and simple process

Inactive Publication Date: 2015-06-10
UNIV OF JINAN
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Problems solved by technology

Chinese patent CN101544546A, a method for extracting and rectifying the separation of ethylene glycol dimethyl ether and water, this patent extracts and rectifies the raw materials by adding inorganic salts to the organic solvent, compared with the simple use of organic solvents, the separation efficiency is higher higher, but there are also shortcomings such as inorganic salts that may corrode equipment, and ionic liquids can well avoid this problem, such as the ionic liquid [Emim] [BF used in the present invention 4 ], 1-ethyl-3-methylimidazolium tetrafluoroborate

Method used

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  • New process for separating methanol-propyl formate azeotrope through extractive distillation

Examples

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Embodiment example 1

[0021] A new process for extractive distillation and separation of methanol-propyl formate azeotrope. The process flow chart is as follows figure 1 Shown. The number of theoretical plates in the extractive distillation column 3 is 100. With 90wt% ethylene glycol and 10wt%[Emim][BF 4 ] As the extractant, add it from the third theoretical plate (the number of plates from top to bottom, nozzle 1), and the flow rate is 2kg / hr. The mixture of methanol and propyl formate is added from the 42nd theoretical plate (nozzle 2), the flow is 1kg / hr, the mass fraction of methanol is 50.2%, 3 is operated under normal pressure, and the reflux ratio at the top of the tower is 5: 1. The temperature at the top of the tower is 60~70℃, and the temperature of the bottom of the tower is 140~160℃. The product at the top of the tower is analyzed by gas chromatography, and methanol product with purity higher than 99.5% is obtained.

[0022] The bottom of the extractive distillation tower 3 enters the so...

Embodiment example 2

[0024] The two-column process of the extractive distillation tower is carried out in Example 1. With 95wt% N-methylpyrrolidone and 5wt% [Emim][BF 4 ] As an extractant, feed from the third theoretical plate with a flow rate of 2.2kg / hr. The mixture of methanol and propyl formate was added from the 42nd theoretical plate, the flow rate was 1 kg / hr, and the composition was the same as in Example 1. The rectification tower 3 is operated under normal pressure, and the reflux ratio is 5.0:1. At this time, the temperature at the top of the tower is 60-70℃, and the temperature at the bottom of the tower is 150-160℃. The top product is analyzed by gas chromatography, and a methanol product with a purity higher than 99.5% is obtained.

[0025] The operating conditions of the solvent recovery tower are the same as in Example 1, and the bottom of the tower is returned to the extractive distillation tower 3 for recycling.

Embodiment example 3

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Abstract

The invention relates to a new process for separating methanol-propyl formate azeotrope through extractive distillation. The methanol-propyl formate azeotropic mixture is separated through the extractive distillation process. A double-tower process is adopted for the extractive distillation process and is composed of an extraction rectifying tower and a solvent recovering tower. The production capacity of the extraction rectifying tower not only needs a reasonable technological process and a tower structure, but also has a requirement on the factors such as the dosage ratio of the raw material and the extracting agent and the feeding location. Aiming at an azeotropic system of the methanol-propyl formate, the mixed solution of the glycol, N-methyl pyrrolidone and an ionic liquid [Emim][BF4] is taken as the extracting agent so as to separate the methanol-propyl formate.

Description

Technical field [0001] The present invention designs a new process for extractive distillation and separation of methanol-propyl formate azeotrope. The design adopts extractive distillation to separate methanol-propyl formate azeotropic mixture. Background technique [0002] The biggest use of methanol is to make other chemicals. About 40% of methanol is converted into formaldehyde, which is used in the production of plastics, plywood, coatings, explosives and non-iron textiles. Methanol is sometimes used for higher molecular construction. For example, using modified kaolin as a catalyst can dehydrate methanol to dimethyl ether. Methanol can be used as a fuel for internal combustion engines on a limited basis. Methanol is also used as a solvent, and as an antifreeze fluid in pipes and windshield washer fluid. In recent years, methanol has also become one of the fuels of fuel cells, such as direct methanol fuel cells. Propyl formate can be used as an organic solvent and used to...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/84C07C69/06C07C67/54
CPCC07C29/84C07C67/54C07C31/04C07C69/06
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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