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Method for separating carbinol acetonitrile azeotrope

A technology of azeotrope and methanol, applied in chemical instruments and methods, purification/separation of carboxylic acid nitriles, preparation of organic compounds, etc.

Inactive Publication Date: 2008-03-05
TIANJIN UNIV
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  • Abstract
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For the separation of this species, there is no industrial report

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  • Method for separating carbinol acetonitrile azeotrope

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Embodiment Construction

[0015] As shown in the figure, T1 and T2 are vacuum rectification tower and pressurized rectification tower 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 the vacuum rectification tower T1. Through the flow process shown in Figure 1, methanol products and acetonitrile products with a purity greater than 99.5% (wt) can be...

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Abstract

The present invention relates to method of separating methanol-acetonitrile azeotrope. By means of the feature of methanol-acetonitrile azeotrope system with positive deviation to Raoult's law, the pressure of the system is lowered or raised to shift the binary azeotropic point and alter the composition of the azeotrope system, so as to reach the separation aim. The decompressing rectification tower has a theoretical plate number of at least 40 and top pressure of 0.3-0.5atm, and compressing rectification tower has a theoretical plate number of at least 25 and top pressure of 5-10 atm. The method can obtain separated methanol and acetonitrile products of purity over 99.5 wt%, has short technological process, easy control and other advantages, and is suitable for separating methanol-acetonitrile solution in different ratio.

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 Applications(China)
IPC IPC(8): C07C255/03C07C253/34C07C31/04C07C29/80
Inventor 白鹏庄琼红
Owner TIANJIN UNIV
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