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High purity recycling and energy integration technology for different concentrations of dichloromethane wastewater

A dichloromethane and wastewater technology, applied in the direction of heating water/sewage treatment, preparation of halogenated hydrocarbons, chemical instruments and methods, etc., can solve the problems of cumbersome process, high energy consumption, waste, etc., and save the preheating system, The effect of short process route and reduced energy consumption

Inactive Publication Date: 2011-07-20
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At the same time, in the refining process of dichloromethane with different concentrations, a large amount of heat is often released
In the traditional process, different concentrations of dichloromethane are often treated separately. Although the corresponding products can be finally obtained through certain methods, the process is cumbersome, the energy consumption is high, and the waste is serious. How to effectively use these refining processes The heat generated in the system is also an important topic of energy saving and consumption reduction.

Method used

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  • High purity recycling and energy integration technology for different concentrations of dichloromethane wastewater
  • High purity recycling and energy integration technology for different concentrations of dichloromethane wastewater

Examples

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Embodiment 1

[0023] The wastewater containing 3% (wt) of dichloromethane, 96% of water, and 1% of salt residues (including other solids) at a flow rate of 5 tons / hour is preheated to 40℃ by the heat exchanger A H-01 Enter the rectification tower A T-01, the number of theoretical plates of the rectification tower A T-01 is 35, the diameter of the tower is 0.6 meters, the operating pressure is normal pressure, the kettle is heated by steam, and the top of the rectification tower A T-01 The condensate of the steam after heat exchange enters the phase separator AS-01, the light phase is refluxed, the top temperature of the rectification tower A T-01 is 80℃, the temperature of the column bottom is 101℃, and pure water and salts are obtained from the bottom of the column Residue (including other solids). The heavy phase is extracted to obtain a dichloromethane-water mixture containing 84.7% dichloromethane, which is sent to the 85% dichloromethane wastewater storage tank B G-02 for mixing. The m...

Embodiment 2

[0025] The wastewater containing 6% (wt) of dichloromethane, 93% of water, 1% of salt residues (including other solids) and a flow rate of 3 tons / hour is preheated to 40℃ by the heat exchanger A H-01 Enter the rectification tower A T-01, the number of theoretical plates of the rectification tower A T-01 is 30, the diameter of the tower is 0.8 meters, the operating pressure is normal pressure, the tower is heated by steam, and the top of the rectification tower A T-01 The condensate of the steam after the heat exchange enters the phase separator AS-01, the light phase is refluxed, the top temperature of the rectification tower A T-01 is 81℃, the temperature of the column bottom is 100℃, and the column bottom gets pure water and salt Residue (including other solids). The heavy phase is extracted to obtain a dichloromethane-water mixture containing 85% dichloromethane, which is sent to the 85% dichloromethane wastewater storage tank B G-02 for mixing. The mixture containing 85% (...

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Abstract

The invention relates to a high purity recycling and energy integration technology for different concentrations of dichloromethane wastewater. The process flow diagram is shown in the figure 1. The technology is as follows: different concentrations of dichloromethane wastewater performs rectification three times, water is removed from the three fractions and dichloromethane of which purity is 99.95% can be obtained finally. In the technological process, the waste heat of the discharged material in the tank bottom can be fully utilized to preheat the material to be distilled, thus the energy can be fully utilized. The technology can be suitable for all the occasions of the high purity recycling of dichloromethane wastewater.

Description

Invention field [0001] The invention relates to a new process for high-purity recovery and energy integration of dichloromethane wastewater with different contents. technical background [0002] Dichloromethane is an important chemical raw material and solvent. Because of its strong solubility and low toxicity, it is widely used in chemical production, coatings, organic synthesis and other fields. In the medical field, a large amount of dichloromethane is also used as a reaction medium or extractant. The demand for dichloromethane in the medical market accounts for about 20% of the entire dichloromethane market. However, due to the particularity of pharmaceutical production, the purity of dichloromethane has very high requirements, and its content must reach at least 99.9%. According to the current domestic production situation, the output of high-purity dichloromethane is far from satisfactory. Market demand. [0003] On the other hand, in the manufacturing process of pharmaceut...

Claims

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Application Information

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IPC IPC(8): C07C19/03C07C17/383C02F1/04
Inventor 张志炳彭璟周政孟为民王宝荣杨高东
Owner NANJING UNIV
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