Industrial device and continuous rectification method for extracting 1,2-propylene dichloride from chlorohydrin process epoxypropane waste liquid

A technology of propylene oxide and propylene oxide, which is applied in the field of extracting 1,2-dichloropropane, can solve the problems of difficulty in automatic control of rectification equipment, equipment corrosion, and small processing capacity, so as to avoid equipment corrosion and production. High Efficiency and Emission Reduction Effect

Inactive Publication Date: 2014-12-17
TIANJIN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the prior art, such as small processing capacity, complex operation, difficulty in automatic control of rectification equipment, serious corrosion of equipment and large amount of waste water, and provide an automatic control, continuous operation, and low operating cost. , no equipment corrosion, the extraction device is simple and highly efficient and energy-saving, and is suitable for industrial scale continuous distillation method and device for extracting 1,2-dichloropropane from chlorohydrin process propylene oxide waste liquid, resulting in 1,2- Dichloropropane product purity can reach 95‐99% (wt), yield 90‐95%

Method used

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  • Industrial device and continuous rectification method for extracting 1,2-propylene dichloride from chlorohydrin process epoxypropane waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0043] The propylene oxide waste liquid that 3000kg / h dichloropropane content is 50% is sent into the propylene oxide waste liquid preheater 2 and the heavy component heat exchange that is extracted at the bottom of the second rectifying tower 10 with the waste liquid pump 1, The outlet temperature of the heavy component at the bottom of the second rectification column was controlled to be 45°C. The preheated propylene oxide waste liquid enters the first rectification tower 3 for rectification. Control the operating pressure at the top of the first rectification tower 3 to be 20KPa, the reflux ratio to be 1, the temperature at the bottom of the tower to be 60°C, and the temperature at the top of the tower to be 30°C. The mixed steam containing propylene oxide, propionaldehyde and water at the top of the tower enters the primary condenser 5 of the first rectification tower and is cooled to 35°C with cooling water, and the liquid phase enters the reflux tank 7 of the first recti...

Embodiment example 2

[0045] The propylene oxide waste liquid that 5000kg / h dichloropropane content is 70% is sent into the propylene oxide waste liquid preheater 2 and the heavy component heat exchange that is extracted at the bottom of the second rectifying tower 10 with the waste liquid pump 1, The outlet temperature of the heavy component at the bottom of the second rectification column was controlled to be 45°C. The preheated propylene oxide waste liquid enters the first rectification tower 3 for rectification. Control the operating pressure at the top of the first rectification tower 3 to be 70KPa, the reflux ratio to be 8, the temperature at the bottom of the tower to be 90°C, and the temperature at the top of the tower to be 40°C. The mixed steam containing propylene oxide, propionaldehyde and water at the top of the tower enters the primary condenser 5 of the first rectification tower and is cooled to 40°C with cooling water, and the liquid phase enters the reflux tank 7 of the first recti...

Embodiment example 3

[0047] The propylene oxide waste liquid that 7500kg / h dichloropropane content is 85% is sent into the propylene oxide waste liquid preheater 2 with the heavy component heat exchange that the second rectifying tower 10 tower bottoms extract with waste liquid pump 1, The outlet temperature of the heavy component at the bottom of the second rectification column was controlled to be 45°C. The preheated propylene oxide waste liquid enters the first rectification tower 3 for rectification. Control the operating pressure at the top of the first rectification tower 3 to be 101.33 KPa, the reflux ratio to be 20, the temperature at the bottom of the tower to be 120° C., and the temperature at the top of the tower to be 50° C. The mixed steam containing propylene oxide, propionaldehyde and water at the top of the tower enters the primary condenser 5 of the first rectification tower and is cooled to 45°C with cooling water, and the liquid phase enters the reflux tank 7 of the first rectif...

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Abstract

The invention relates to an industrial device and a continuous rectification method for extracting 1,2-propylene dichloride from chlorohydrin process epoxypropane waste liquid. The method comprises the following steps: rectifying the epoxypropane waste liquid, condensing stage by stage, rectifying, condensing, and separating to obtain 1,2-propylene dichloride. The method has the advantages that obtained 1,2-propylene dichloride is colorless, transparent and free of pungent smell and has the purity of 95%-99% by weight and the yield of 90%-95%, and equipment corrosion is avoided. According to the continuous rectification process, an azeotropic agent-water does not need to be added, so that the problem of equipment corrosion is avoided; meanwhile, the rectification process is continuously carried out, so that the production efficiency is high and the product quality is stable; moreover, the rectification process can be continuously carried out along with the industrial device for epoxypropane production by adopting the chlorohydrin process, so that the discharge amount of the epoxypropane waste liquid is greatly reduced and the economic benefits of enterprises are increased.

Description

technical field [0001] The invention relates to an industrial device and a continuous rectification method for extracting 1,2-dichloropropane from propylene oxide waste liquid of chlorohydrin process. Background technique [0002] At present, there are two main methods for industrial production of propylene oxide: chlorohydrin method and co-oxidation method. Propylene oxide production in my country mainly adopts the chlorohydrin method, that is, propylene and chlorine gas are used as raw materials, chloropropanol is obtained through hypochlorous acid oxidation, and then propylene oxide is obtained through saponification. The process produces 0.15‐0.35 tons of waste liquid per ton of propylene oxide product, which contains 50‐85% (wt) 1,2‐dichloropropane, in addition to 5‐20% (wt) Bis‐(2‐chloroisopropyl) ether, 1‐10% (wt) propylene oxide, 1‐15% (wt) chloropropanol, 0‐10% (wt) allyl chloride, in addition, contains About 1% (wt) of water and a small amount of unknown aldehyde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/383C07C19/01
Inventor 张雪梅简春贵刘云仙刘宏鹏
Owner TIANJIN UNIV
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