Method for continuously vacuum volatilizing and separating azeotrope and device

A technology of vacuum volatilization and azeotrope, applied in the direction of vacuum distillation, etc., can solve the problems of high control level, increase the complexity of the device, increase the equipment cost, etc., and achieve the effect of low heating temperature, convenient operation, and increase of volatilization area.

Inactive Publication Date: 2008-10-01
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0002] In fine chemical, pharmaceutical and other industries, many azeotropic systems are often involved, and it is difficult to achieve effective separation by ordinary distillation
The current extractive distillation, azeotropic distillation, salt-added extractive distillation, etc. need to add a third component, and there are problems in the screening of the third component and in the separation process and subsequent treatment of the third component. Differen

Method used

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  • Method for continuously vacuum volatilizing and separating azeotrope and device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1 steps

[0031] Connect glass towers, condensers, vacuum pumps and other equipment according to the installation diagram, and seal them to check the air tightness of the entire system;

[0032] Surround the three-necked flask with crushed ice, so that the gas that cannot be condensed after passing through the coil condenser can be completely condensed here, so as to prevent the gas from being sucked into the vacuum pump and damaging the vacuum pump;

[0033] Wrap a heating tape on the surface of the packing section and connect it with a pressure regulator;

[0034] Add an ethanol-water solution with an ethanol mass fraction of 0.94 to the raw material kettle, turn on the condensed water, turn on the vacuum pump, observe the mercury pressure difference, and keep the system at a constant pressure of 13kPa;

[0035] Adjust the heating voltage to heat the packing section. Control the heating temperature t during the experiment 1 It is 20°C, so that the two components d...

Example Embodiment

[0039] Example 2 steps

[0040] Connect glass towers, condensers, vacuum pumps and other equipment according to the installation diagram, and seal them to check the air tightness of the entire system;

[0041] Surround the three-necked flask with crushed ice, so that the gas that cannot be condensed after passing through the coil condenser can be completely condensed here, so as to prevent the gas from being sucked into the vacuum pump and damage the vacuum pump;

[0042] Wrap a heating tape on the surface of the packing section and connect it with a pressure regulator;

[0043] Add the ethanol-toluene solution with an ethanol mass fraction of 0.65 to the raw material kettle, turn on the condensed water, turn on the vacuum pump, observe the mercury pressure difference meter, and keep the system at a constant pressure of 11kPa;

[0044] Adjust the heating voltage to heat the packing section. Control the heating temperature t during the experiment 1 It is 20°C, so that the two compo...

Example Embodiment

[0048] Example 3 steps

[0049] Connect glass towers, condensers, vacuum pumps and other equipment according to the installation diagram, and seal them to check the air tightness of the entire system;

[0050] Surround the three-necked flask with crushed ice, so that the gas that cannot be condensed after passing through the coil condenser can be completely condensed here, so as to prevent the gas from being sucked into the vacuum pump and damaging the vacuum pump;

[0051] Wrap a heating tape on the surface of the packing section and connect it with a pressure regulator;

[0052] Add the ethanol-cyclohexane solution with an ethanol mass fraction of 0.25 to the raw material kettle, turn on the condensed water, turn on the vacuum pump, observe the mercury pressure difference, and keep the system at a constant pressure of 15kPa;

[0053] Adjust the heating voltage to heat the packing section. Control the heating temperature t during the experiment 1The temperature is 15°C, so that t...

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Abstract

The invention relates to a method and a device which are used for separating azeotrope by continuous vacuum volatilization. In the method, by the operation in vacuum, the heating temperature of a system is lower than bubble point of an article to be separated so as to avoid the boiling of the article; according to the difference of volatilization speed and diffusion speed between components, azeotropic limit is broken through, thus achieving the separation object. Furthermore, the volatile area is increased by a filing material layer, a mass transfer process is reinforced, and a testing device of continuous vacuum volatilization separation method is established. Compared with existing azeotrope separation method, the method of the invention has the advantages of requiring no third component, friendly environment, simple equipment, convenient operation and low energy consumption. The method of the invention is suitable for the separation of azeotropic mixture.

Description

technical field [0001] The invention relates to azeotrope separation, in particular to a method and device for continuous vacuum volatilization and separation of azeotrope. Background technique [0002] In fine chemical, pharmaceutical and other industries, many azeotropic systems are often involved, and it is difficult to achieve effective separation by ordinary distillation. The current extractive distillation, azeotropic distillation, salt-added extractive distillation, etc. need to add a third component, and there are problems in the screening of the third component and in the separation process and subsequent treatment of the third component. Difficulties of varying degrees; especially in industries such as pharmaceuticals, product quality requirements generally have strict control over the residual amount of the third component added, thereby limiting the use of these separation methods. Although pressure swing distillation does not use a separating agent, the integra...

Claims

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Application Information

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IPC IPC(8): B01D3/10
Inventor 白鹏黄崇顺
Owner TIANJIN UNIV
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