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Extractive distillation process of methanol, dichloromethane and water

A technology of dichloromethane and process methods, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of complicated separation process, inability to realize continuous operation, cumbersome control, etc., and achieve high product purity , Significant practicability and economic benefits, low energy consumption

Active Publication Date: 2016-12-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This separation process is complicated, the control is cumbersome, and continuous operation cannot be realized, so it needs to be improved

Method used

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  • Extractive distillation process of methanol, dichloromethane and water

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Effect test

Embodiment 1

[0049] The massfraction of dichloromethane, methyl alcohol and water in the raw material liquid is 60%, 35%, 5% respectively, and the feed rate is 10000kg / h, and the temperature entering the extractive distillation tower is 25°C; 0.34 times of the feed amount, the feed temperature is 25°C, enter the extractive distillation tower operated at normal pressure for rectification, the reflux ratio of the extractive distillation tower is 1, the tower top temperature is 36°C, and the tower bottom temperature is 79°C . The high-purity dichloromethane mixed liquid (the mass fraction of dichloromethane is 95%) flowing out from the top of the tower is separated in a phase separator under normal pressure at 25° C. to obtain 99.8% of dichloromethane by mass fraction. The methanol rectification tower rectifies the mixture of methanol and water under normal pressure, the top of the tower obtains methanol with a mass fraction of 99.9%, and the bottom of the tower obtains water with a mass frac...

Embodiment 2

[0051] The massfraction of dichloromethane, methyl alcohol and water in the raw material liquid is 70%, 25%, 5% respectively, and the feed rate is 8000kg / h, and the temperature entering the extractive distillation tower is 20 DEG C; 1 times of feed amount, feed temperature is 20 ℃, and flow rate is 4000kg / h, enters the extractive distillation column rectification of normal pressure operation, and the reflux ratio of described extractive distillation column is 0.3, and tower top temperature is 40 ℃, The temperature in the bottom of the tower was 84°C. The high-purity dichloromethane mixed liquid (the mass fraction of dichloromethane is 99%) flowing out from the top of the tower was separated in a phase separator under normal pressure at 20° C. to obtain 99.81% of dichloromethane in mass fraction. The methanol rectification tower rectifies the mixture of methanol and water under normal pressure, the top of the tower obtains methanol with a mass fraction of 99.88%, and the bottom...

Embodiment 3

[0053] The mass fractions of dichloromethane, methanol and water in the raw material liquid are 70%, 22%, and 8% respectively, the feed rate is 10000kg / h, and the temperature entering the extractive distillation tower is 30°C; the quality of the extractant is the raw material liquid 0.6 times of the feed amount, the feed temperature is 30°C, the flow rate is 5200kg / h, enter the extractive distillation tower operated at normal pressure for rectification, the reflux ratio of the extractive distillation tower is 1.5, and the tower top temperature is 34°C , the temperature of the tower kettle was 77°C. The high-purity dichloromethane mixed liquid (95% mass fraction of dichloromethane) flowing out from the top of the tower was separated in a phase separator under normal pressure at 30° C. to obtain 99.76% mass fraction of dichloromethane. The methanol rectification tower rectifies the mixture of methanol and water under normal pressure, the top of the tower obtains methanol with a ...

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Abstract

The invention relates to an extraction and rectification process for separating methanol, dichloromethane and water. The raw material liquid is fed from the middle of the extractive distillation tower, and the extractant is fed from the upper part of the extractive distillation tower. The dichloromethane mixture can be obtained at the top of the extractive distillation tower. After entering the phase separator for phase separation, the heavy phase dichloromethane product is extracted, and the light phase water is returned to the extractive distillation tower. The mixture of methanol and water obtained in the extractive distillation tower bottom enters the methanol rectification tower for purification, methanol is produced at the top of the tower, and high-temperature water is produced at the bottom of the tower. Temperature and flow requirements enter the extractive distillation column for recycling. In the invention, water is used as the extractant, and the water is recycled to reduce the production cost, and the continuous rectification extraction improves the output. The heat released by the condenser in the process flow can supply the heat required by the extractive distillation tower and / or the methanol distillation tower bottom, which has significant practical and economic benefits.

Description

technical field [0001] The invention relates to an extraction and rectification process for methanol, dichloromethane and water mixture. In the method, water is used as an extractant and recycled. Background technique [0002] Dichloromethane (methylene chloride) is a colorless, transparent, heavier than water, volatile liquid, slightly soluble in water, has the advantages of strong solubility and low toxicity, and is widely used in the manufacture of film and polycarbonate, In the pharmaceutical industry, it is used as a reaction medium for the preparation of ampicillin, etc. It can also be used as a paint solvent, metal degreasing agent, gas mist propellant, polyurethane foaming agent, mold release agent, paint remover, petroleum dewaxing solvent, organic synthesis extractant etc. Dichloromethane and methyl alcohol can form azeotrope (methanol content mass fraction is 7.3%), and water and dichloromethane also can form azeotrope (water content mass fraction 1.5%), so metha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/03C07C17/386C07C31/04C07C29/84
Inventor 李春利王洪海李月余迎新王荣良
Owner HEBEI UNIV OF TECH
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