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Continuous distillation method for extracting two-(2-chloroisopropyl) ether from propylene oxide waste liquid

A technology of propylene oxide and chloroisopropyl, which is applied in the field of rectification and can solve the problem of severe equipment corrosion, difficulty in separating bis-(2-chloroisopropyl) ether, and no extraction of bis-(2-chloroisopropyl) Base) ether and other problems, to avoid equipment corrosion, stable product quality, high production efficiency

Inactive Publication Date: 2015-12-02
天津中昊天久工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1513826A discloses a kind of azeotropic distillation method to extract two-(2-chloroisopropyl) ether from propylene oxide waste liquid, the other entrainer except water that this method provides and two- (2-Chloroisopropyl) ether is difficult to separate and difficult to obtain practical application
When water is used as the entrainer, a large amount of chlorine-containing compounds in the waste liquid will be hydrolyzed to produce hydrochloric acid at the rectification temperature of 90-115°C, which will seriously corrode the equipment, and at the same time, azeotropic rectification will also produce a large amount of waste water
At present, there is no report of the continuous distillation separation method of extracting two-(2-chloroisopropyl) ether from the chlorohydrin process propylene oxide waste liquid

Method used

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  • Continuous distillation method for extracting two-(2-chloroisopropyl) ether from propylene oxide waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of continuous rectification method that extracts two-(2-chloroisopropyl) ether from propylene oxide waste liquid, the steps are as follows:

[0033] (1) Preheating: 500kg / h of dichloropropane-extracted propylene oxide waste liquid is pumped into the waste liquid preheater to exchange heat with the heavy components extracted from the bottom of the product tower.

[0034] (2) Rectification and impurity removal: The preheated propylene oxide waste liquid enters the light component tower for rectification. Control the operating pressure at the top of the light end column to be 0.1KPa, and the reflux ratio to be 0.1. The temperature at the bottom of the tower is 80°C, and the temperature at the top of the tower is 30°C.

[0035] (3) Cooling and recovery of mixed steam: the mixed steam of dichloropropane and chloropropanol at the top of the tower enters the primary condenser of the light component tower and is partially condensed with cooling water, and the liquid pha...

Embodiment 2

[0042] A kind of continuous rectification method that extracts two-(2-chloroisopropyl) ether from propylene oxide waste liquid, the steps are as follows:

[0043] (1) Preheating: 1000kg / h of dichloropropane-extracted propylene oxide waste liquid is pumped into the waste liquid preheater to exchange heat with the heavy components extracted from the bottom of the product tower.

[0044] (2) Rectification and impurity removal: The preheated propylene oxide waste liquid enters the light component tower for rectification. Control the operating pressure at the top of the light end column to be 50KPa, the reflux ratio to be 10, the temperature at the bottom of the tower to be 190°C, and the temperature at the top of the tower to be 50°C.

[0045] (3) Cooling and recovery of mixed steam: the mixed steam of dichloropropane and chloropropanol at the top of the tower enters the primary condenser of the light component tower and is partially condensed with cooling water, and the liquid ph...

Embodiment 3

[0052] A kind of continuous rectification method that extracts two-(2-chloroisopropyl) ether from propylene oxide waste liquid, the steps are as follows:

[0053] (1) Preheating: 3000kg / h of dichloropropane-extracted propylene oxide waste liquid is pumped into the waste liquid preheater to exchange heat with the heavy components extracted from the bottom of the product tower.

[0054] (2) Rectification and impurity removal: The preheated propylene oxide waste liquid enters the light component tower for rectification. Control the operating pressure at the top of the light end column to be 101.33KPa, the reflux ratio to be 20, the temperature at the bottom of the tower to be 130°C, and the temperature at the top of the tower to be 100°C.

[0055] (3) Cooling and recovery of mixed steam: the mixed steam of dichloropropane and chloropropanol at the top of the tower enters the primary condenser of the light component tower and is partially condensed with cooling water, and the liqu...

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Abstract

The invention relates to a continuous rectification method for extracting bis-(2-chloro isopropyl) ether from epoxy propane waste liquor. The continuous rectification method comprises the following steps: (1) preheating; (2) rectification for impurity removal; (3) mixed steam cooling and recovery; (4) refluxing; (5) target product rectification, wherein a tower kettle material of a light-component tower is delivered into a product tower 10 through a tower bottom pump 9 of the light-component tower to be rectified, the tower kettle of the product tower is heated through a reboiler 11 of the product tower, the tower top operating pressure of the product tower is controlled at 0.1-101.33KPa, the reflux ratio is controlled at 0.1-10, the tower kettle temperature is controlled at 80-200 DEG C, the tower top temperature is controlled at 60-180 DEG C, and bis-(2-chloro isopropyl) ether steam is distilled at a tower top; (6) target product condensation; (7) product refluxing; (8) tower bottom treatment. The continuous rectification method for extracting bis-(2-chloro isopropyl) ether from the epoxy propane waste liquor, which is disclosed by the invention, prevents the problem of equipment corrosion by adopting a continuous rectification process without adding entrainer water.

Description

technical field [0001] The invention belongs to the rectification field and relates to a method for recovering active components in waste liquid, in particular to a continuous rectification method for extracting bis-(2-chloroisopropyl) ether from propylene oxide waste liquid. Background technique [0002] At present, the production of propylene oxide in my country mainly adopts the chlorohydrin method, and the by-products produced in this process contain 50-85% (wt) 1,2-dichloropropane and 5-20% (wt) bis-(2-chloroisopropyl In addition, it also contains more than 30 components such as a small amount of propylene oxide, chloropropanol, allyl chloride water and some unknown aldehydes and ketones. Due to the complex composition of the by-product, difficulty in separation, yellow color and strong pungent odor, most domestic propylene oxide manufacturers can only sell it as a low-end solvent or burn it away. With the increasingly stringent environmental protection requirements and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/42C07C43/12
CPCC07C41/42C07C43/123
Inventor 简春贵张雪梅
Owner 天津中昊天久工程技术有限公司