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Method for rectification dehydration of 2-methylpyridine

A methylpyridine and rectification technology, applied in fractionation, distillation regulation/control, organic chemistry, etc., can solve problems such as resource waste, environmental pollution, and inability to separate mixtures, and achieve simple equipment, good separation effect, and strong versatility. Effect

Inactive Publication Date: 2017-06-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2-picoline forms the lowest azeotrope with water, and conventional distillation cannot separate this mixture. If these mixed liquids are discharged directly, it will cause serious environmental pollution problems and cause waste of resources. Therefore, a suitable separation method is sought. method is very necessary
At present, there is no report on the separation method of 2-picoline and water azeotropic system in the literature. Therefore, it is of great practical significance and industrial value to propose a green and easy-to-control method for separating 2-picoline and water.

Method used

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  • Method for rectification dehydration of 2-methylpyridine

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] The azeotropic rectification tower is a tray tower with a diameter of 1200mm and a height of 5 meters. There are 8 trays inside. The mixture of raw materials 2-picoline and water enters the tower from the second tray at a flow rate of 10000 kg / h. The mass fraction of 2-picoline in the raw material mixture is 90%, and the water is 10%. The operating pressure of the azeotropic distillation tower is 1 atm. In the azeotropic distillation tower, since 2-picoline and water form the lowest azeotrope, the steam close to the azeotropic composition will be drawn from the top of the tower, and the temperature at the top of the tower is 95- 96 ° C, cooled to 40-45 ° C by the top condenser 3, then enters the stratifier 4, and is divided into two liquid phases at 4, one is an organic phase (containing a large amount of organic phase return pipe and a small amount of water), and the other is water Phase (containing a large amount of water and a small amount of 2-picoline). The organi...

Embodiment 2

[0025] The azeotropic rectification tower is a tray tower with a diameter of 1200mm and a height of 6 meters. There are 10 trays inside. The mixture of raw materials 2-picoline and water enters the tower from the third tray at a flow rate of 10000 kg / h. The mass fraction of 2-picoline in the raw material mixture is 95%, and the water is 5%. The operating pressure of the azeotropic distillation column 1 is 0.8 atm. In the azeotropic distillation column 1, since 2-picoline and water form the lowest azeotrope, the steam close to the azeotropic composition will be drawn from the top of the column, and the temperature at the top of the column will be It is 88-89°C, cooled to 40-45°C by the top condenser 3, and then enters the stratifier 4, where it is divided into two liquid phases, one is an organic phase (containing a large amount of organic phase reflux pipe and a small amount of water), The other is the aqueous phase (containing a large amount of water and a small amount of 2-p...

Embodiment 3

[0028] The azeotropic rectification tower is a plate tower with a diameter of 1000mm and a height of 5 meters. There are 16 trays inside. The mixture of raw materials 2-picoline and water enters the tower from the fifth plate at a flow rate of 10000 kg / h. The mass fraction of 2-picoline in the raw material mixture is 93%, and the water is 7%. The operating pressure of the azeotropic distillation tower is 1 atm. In the azeotropic distillation tower, since 2-picoline and water form the lowest azeotrope, the steam close to the azeotropic composition will be drawn from the top of the tower, and the temperature at the top of the tower is 95- 96 ° C, cooled to 40-45 ° C by the top condenser 3 and then enters the stratifier 4, where it is divided into two liquid phases, one is the organic phase (containing a large amount of organic phase return pipe and a small amount of water), and the other is Aqueous phase (contains a large amount of water and a small amount of 2-picoline). The o...

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Abstract

The invention discloses a method for rectification dehydration of 2-methylpyridine and belongs to the field of chemical separation and purification. The method comprises introducing aqueous 2-methylpyridine into an azeotropic rectification tower, condensing rising steam at the tower top through a condenser, feeding the condensed steam into a laminator, dividing the liquid in the laminator into two phases, carrying out reflux on the organic phase from the tower top, feeding the water phase into a water recovery tower, and collecting 2-methylpyridine at the bottom of the tower. 2-methylpyridine and water form a heterogeneous azeotrope so that a solvent is avoided. The heterogeneous azeotropic rectification technology realizes complete separation of 2-methylpyridine and water so that 2-methylpyridine having a mass separation fraction of greater than 99.5% and water are obtained. The method has the characteristics of simple equipment, strong universality and good separation effect.

Description

technical field [0001] The invention belongs to the field of separation and purification of chemical industry, and relates to a method for separating 2-picoline and water azeotrope, and furthermore, relates to a method for separating 2-picoline and water azeotrope in a double-tower process. Background technique [0002] 2-Methylpyridine, also known as α-Methylpyridine, is a colorless oily liquid with a strong and unpleasant pyridine smell, which can be used to produce fertilizer synergists, herbicides, livestock repellents, rubber accelerators, intermediate dyes body etc. It is also used in the synthesis of pharmaceuticals, dyes, rubber and other chemicals and also as a solvent. [0003] 2-picoline is widely used as a solvent in the fine chemical and pharmaceutical industries, and is also used in the synthesis of pharmaceuticals, dyes, rubber and other chemicals to produce a large amount of mixed liquid of 2-picoline and water. 2-picoline forms the lowest azeotrope with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/16B01D3/14B01D3/42
CPCB01D3/14B01D3/42C07D213/16
Inventor 叶青陈景行刘通吴卫忠
Owner CHANGZHOU UNIV
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