Industrial device and continuous distillation method for extracting 1,2-dichloropropane from chlorohydrin process propylene oxide 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 difficult automatic control of rectification equipment, small processing capacity, and complicated operation, so as to avoid equipment corrosion and reduce Emissions, the effect of increasing economic benefits

Inactive Publication Date: 2016-08-17
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • 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 distillation method for extracting 1,2-dichloropropane from chlorohydrin process propylene oxide waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0043] Send 3000kg / h of propylene oxide waste liquid with 50% dichloropropane content to the propylene oxide waste liquid preheater 2 with waste liquid pump 1 to exchange heat with the heavy components extracted from the bottom of the second rectification tower 10, Control the outlet temperature of the heavy components at the bottom of the second rectification tower to 45°C. The preheated propylene oxide waste liquid enters the first rectification tower 3 for rectification. The operating pressure at the top of the first distillation tower 3 is controlled to be 20KPa, the reflux ratio is 1, the temperature at the bottom of the tower is 60°C, and the temperature at the top of the tower is 30°C. The mixed vapor containing propylene oxide, propionaldehyde and water at the top of the tower enters the first-stage 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 rectification tower by grav...

Embodiment example 2

[0045] The 5000kg / h dichloropropane content of 70% propylene oxide waste liquid is sent to the propylene oxide waste liquid preheater 2 with the waste liquid pump 1 to exchange heat with the heavy components extracted from the bottom of the second rectification tower 10, Control the outlet temperature of the heavy components at the bottom of the second rectification tower to 45°C. The preheated propylene oxide waste liquid enters the first rectification tower 3 for rectification. The operating pressure at the top of the first distillation tower 3 is controlled to be 70KPa, the reflux ratio is 8, the temperature of the bottom of the tower is 90°C, and the temperature of the top of the tower is 40°C. The mixed vapor containing propylene oxide, propionaldehyde and water at the top of the tower enters the first-stage 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 rectification tower b...

Embodiment example 3

[0047] Send 7500kg / h of propylene oxide waste liquid with 85% dichloropropane content to the propylene oxide waste liquid preheater 2 with waste liquid pump 1 to exchange heat with the heavy components extracted from the bottom of the second rectification tower 10, Control the outlet temperature of the heavy components at the bottom of the second rectification tower to 45°C. The preheated propylene oxide waste liquid enters the first rectification tower 3 for rectification. The operating pressure at the top of the first distillation tower 3 is controlled to 101.33KPa, the reflux ratio is 20, the bottom temperature is 120°C, and the top temperature is 50°C. The mixed vapor containing propylene oxide, propionaldehyde and water at the top of the tower enters the first-stage 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 rectification tower by gravity. The condensed vapor phase enter...

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Abstract

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. The propylene oxide waste liquid is rectified, condensed step by step, rectified and condensed again, and the 1,2-dichloropropane product is obtained after separation, which is colorless, transparent, and has no irritating smell, and the purity can reach 95-99% (wt). The rate is 90‑95%, and the equipment has no corrosion. The invention adopts a continuous rectification process, does not need to add entrainer water, and avoids the problem of equipment corrosion. At the same time, the rectification process runs continuously, the production efficiency is high, the product quality is stable, and it can be used continuously with the chlorohydrin method propylene oxide industrial device. The operation greatly reduces the discharge of propylene oxide waste liquid and increases the economic benefits of the enterprise.

Description

Technical field [0001] The invention relates to an industrial device and a continuous distillation method for extracting 1,2-dichloropropane from a chlorohydrin process propylene oxide waste liquid. Background technique [0002] At present, there are mainly two industrial methods for producing propylene oxide: the chlorohydrin method and the co-oxidation method. The production of propylene oxide in my country mainly adopts the chlorohydrin method, that is, propylene and chlorine are used as raw materials, chloropropanol is obtained by oxidation of hypochlorous acid, and then propylene oxide is obtained by saponification. The process produces 0.15-0.35 tons of waste liquid for every ton of propylene oxide product produced. The waste liquid contains 50-85% (wt) of 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, it also contains About 1% (wt) water and a sma...

Claims

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Application Information

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Patent Type & Authority Patents(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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