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Propyl alcohol-dichloromethane-water multi component system rectification separation method

A dichloromethane, rectification separation technology, applied in the field of rectification separation of propanol-dichloromethane-water multi-component system, can solve the problem that the separation requirements of ternary azeotropic system cannot be fully met, the separation process is difficult to carry out, extraction and Separation limitations and other issues, achieve significant practicality and economic benefits, improve purity, and simplify production equipment

Inactive Publication Date: 2016-06-29
QINGDAO QINGQUAN BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Part of the benzene is mixed with the product, resulting in azeotropy between most of the solvents, making the separation process difficult
In recent years, there have been many effective separation methods for binary azeotropic systems, but the separation of three-component systems is extremely difficult due to the more complicated relationship between components and forces.
The separation method of the binary azeotrope system can no longer fully meet the separation requirements of the ternary azeotrope system
If it is not separated and purified, it will not only pollute the environment, but also increase production costs
The separation method in the prior art is time-consuming and requires a large amount of solvent, and the extraction and separation of trace components with similar structural properties are often limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for rectification and separation of propanol-dichloromethane-water multiple system, is characterized in that, specifically comprises the following steps:

[0019] (1) Dewatering layer: gradually add inorganic salt to the mixture of propanol-dichloromethane-water multi-component system, reduce the water content to 15%, add sodium carbonate while stirring, let it stand for stratification after reaching the saturated concentration, and pass the liquid separation funnel to remove the water layer;

[0020] (2) Propanol removal: Pour the mixed solution of the above water-removed layer into the atmospheric tower for a rectification, part of the bottom material of the atmospheric tower enters the reboiler at the bottom of the tower, and enters the atmospheric tower after reboiling, and part of the material is After passing through the reflux tank of the condenser, control the temperature at 70°C, and collect after reflux for 35-5 minutes;

[0021] (3) Benzene removal:...

Embodiment 2

[0028] A method for rectification and separation of propanol-dichloromethane-water multiple system, is characterized in that, specifically comprises the following steps:

[0029] (1) Dewatering layer: gradually add inorganic salt to the mixture of propanol-dichloromethane-water multi-component system, reduce the water content to 15%, add sodium carbonate while stirring, let it stand for stratification after reaching the saturated concentration, and pass the liquid separation funnel to remove the water layer;

[0030] (2) Propanol removal: Pour the mixed solution of the above water-removed layer into the atmospheric tower for a rectification, part of the bottom material of the atmospheric tower enters the reboiler at the bottom of the tower, and enters the atmospheric tower after reboiling, and part of the material is After passing through the reflux tank of the condenser, control the temperature at 75°C, and collect after reflux for 40 minutes;

[0031] (3) Benzene removal: F...

Embodiment 3

[0038] A method for rectification and separation of propanol-dichloromethane-water multiple system, is characterized in that, specifically comprises the following steps:

[0039] (1) Dewatering layer: gradually add inorganic salt to the mixture of propanol-dichloromethane-water multi-component system, reduce the water content to 15%, add sodium carbonate while stirring, let it stand for stratification after reaching the saturated concentration, and pass the liquid separation funnel to remove the water layer;

[0040] (2) Propanol removal: Pour the mixed solution of the above water-removed layer into the atmospheric tower for a rectification, part of the bottom material of the atmospheric tower enters the reboiler at the bottom of the tower, and enters the atmospheric tower after reboiling, and part of the material is Through the condenser reflux tank, control the temperature at 80°C, and collect after reflux for 35 minutes;

[0041] (3) Benzene removal: Feed the collected mix...

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PUM

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Abstract

The present invention discloses a propyl alcohol-dichloromethane-water multi component system rectification separation method including the following steps: (1) removing a water layer; (2) removing propyl alcohol; (3) removing benzene; and (4) separating to obtain a dichloromethane solution. Water in a ternary-component mixture is removed successively by use of an inorganic salt and sodium carbonate, production equipment is simplified, production cost is reduced, by atmospheric tower rectification, a ternary-component system is decomposed into two binary-component systems without introduction of a fourth material, and purity is improved; a methanol-benzene binary mixture collected from the tower top can be respectively separated into methanol and benzene by variable pressure rectification; water as an extraction agent is used for extractive rectification in an atmospheric pressure extractive rectification tower to obtain a high purity product of dichloromethane, and the method has the characteristics of low power consumption, high recovery rate, low pollution and high product purity, and has significant practical and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of mixture separation, and in particular relates to a rectification separation method for a propanol-dichloromethane-water multi-component system. Background technique [0002] Propanol, methylene chloride, benzene and other substances are excellent organic solvents, and are raw materials for synthetic fuels, paints, medicines, pesticides, and various petrochemical products, and are widely used in many industries such as organic synthesis, plastics, resins, and medicine. . Part of the benzene is mixed with the product, resulting in azeotropy between most of the solvents, making the separation process difficult. In recent years, there have been many effective separation methods for binary azeotropic systems, but the separation of three-component systems is extremely difficult due to the more complicated relationship between components and the force relationship. The separation method of the binary azeotrope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/10C07C29/76C07C29/80C07C19/03C07C17/38C07C17/386C07C15/04C07C7/00C07C7/04
Inventor 王祖刚
Owner QINGDAO QINGQUAN BIOTECH CO LTD