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Method for separating carbinol acetonitrile azeotrope

An azeotrope, methanol technology, used in chemical instruments and methods, carboxylic acid nitrile purification/separation, preparation of organic compounds, etc.

Inactive Publication Date: 2009-10-14
TIANJIN UNIV
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  • Description
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  • Application Information

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  • Method for separating carbinol acetonitrile azeotrope
  • Method for separating carbinol acetonitrile azeotrope
  • Method for separating carbinol acetonitrile azeotrope

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Embodiment Construction

[0015] As shown in the figure, T1 and T2 are the vacuum rectification tower and the pressurized rectification tower respectively, H1 and H2 are the tower still reboilers of the vacuum rectification tower and the pressurized rectification tower respectively, and C1 and C2 are respectively The top condenser of the vacuum rectification column and the pressurized rectification column.

[0016] The normal-pressure azeotrope of methanol-acetonitrile is added to vacuum rectification tower T1 through line 1, and after being rectified and separated by T1 tower, the purified high-purity methanol product leaves the system through line 3, and the co Boilers enter the pressurized rectification column T2 via line 2. After rectification and separation in the T2 tower, the purified high-purity acetonitrile product leaves the system through line 5, and the azeotrope under pressure extracted from the top of the tower is mixed with the normal pressure azeotrope through line 4, and then enters th...

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Abstract

The invention relates to a method for separating methanol acetonitrile azeotrope. Taking advantage of the positive deviation of the methanol-acetonitrile system to Raoult's law, reducing or increasing the pressure can break the binary azeotropic point formed by methanol-acetonitrile under normal pressure, thereby changing the composition of the azeotrope and achieving the purpose of separation. The number of theoretical plates in the vacuum rectification tower is at least 40, and the pressure at the top of the tower is 0.3-0.5 atm. The number of theoretical plates in the pressurized rectification tower is at least 25, and the pressure at the top of the tower is 5-10 atm. The invention can separate and obtain methanol products and acetonitrile products with a purity greater than 99.5% (wt). The method has short technological process, less equipment investment, convenient operation and easy control, and is suitable for methanol-acetonitrile solutions mixed in any ratio, especially for mixed solutions with azeotropic composition (methanol mass concentration 79%-80%).

Description

technical field [0001] The invention relates to the technical field of methanol separation, in particular to a method for separating methanol acetonitrile azeotrope. technical background [0002] Methanol is widely used in industries such as medicine, pesticide, dyestuff, synthetic fiber, synthetic rubber, synthetic plastic and synthetic resin, and its output is second only to synthetic ammonia and ethylene, ranking third in the world. Acetonitrile (methonitrile) is an important organic chemical raw material. Because acetonitrile has a unique functional group nitrile group, as a solvent, it not only has the characteristics of ethanol, methanol and other solvents, but also has better distribution ratio and desorption capacity than alcohols. In the petrochemical industry, it is often used as an extractant for butadiene and isoprene fractions; it is an important raw material or intermediate for pharmaceuticals, pesticides, dyes, and synthetic fragrances, and can also be used a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/03C07C31/04C07C29/80
Inventor 白鹏庄琼红
Owner TIANJIN UNIV
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