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Method and equipment for preparing ethylene oxide from high-concentration chloroethanol

A technology of ethylene oxide and chloroethanol, applied in separation methods, chemical instruments and methods, distillation separation, etc., can solve the problems of large amount of sewage, large investment, non-compliance, etc., and achieve the effect of less pollution

Active Publication Date: 2021-08-13
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The initial investment of ethylene oxidation method is large, there are many equipments, and the process flow is long; at present, the saponification process of the chloroethanol method is carried out in a kettle or tower reactor, and the process flow is simple, the investment is small, and the product quality can meet the production requirements of downstream products. Requirements and other advantages, but its disadvantages are mainly that chlorine gas is dissolved in water first in the process to generate hypochlorous acid and then react with ethylene. In order to ensure that chlorine gas is fully dissolved, a large amount of water is needed, and finally it is carried out with 4%-6% dilute chloroethanol solution. Saponification reaction, low product yield, high energy consumption, large amount of sewage, does not meet the requirements of green chemical development

Method used

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  • Method and equipment for preparing ethylene oxide from high-concentration chloroethanol
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  • Method and equipment for preparing ethylene oxide from high-concentration chloroethanol

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Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1 uses 1.7m 3 / h mass concentration is 50% chloroethanol solution and 15m 3 / h mass concentration of 9.48% milk of lime solution preheated to 80 ℃, into the pre-reactor (converted to chloroethanol and milk of lime solution in the molar ratio of calcium hydroxide is 0.6). The residence time of the material in the pre-reactor is about 2-3 seconds, and it enters a saponification reaction rectification tower with a diameter of 800 mm and a total of 17 plates. The position of the feeding plate is the sixth, and the condensation temperature of the top part of the tower is 40 ° C. , the reflux volume is 2m 3 / h (the condensate after the top part of the tower is condensed is full reflux, and the uncondensed part is the product ethylene oxide), the amount of the top product is 0.6m 3 / h, wherein the content of ethylene oxide is 77.47% (wt), the content of chloroethanol is 0.55% (wt), the temperature at the bottom of the tower is 101-102°C, and the temperature at the...

Embodiment 2

[0047] Embodiment 2 uses 1.7m 3 / h mass concentration is 60% chloroethanol solution and 18m 3 / h The milk of lime with a mass concentration of 9.48% is preheated to 75° C. and enters the prereactor (the molar ratio of chloroethanol to calcium hydroxide in the milk of lime solution is 0.6). The residence time of the material in the pre-reactor is about 2-3 seconds, and it enters a saponification reaction rectification tower with a diameter of 1000 mm and a total of 17 plates. The position of the feeding plate is the sixth, and the condensation temperature of the top part of the tower is 30 ° C. , the reflux volume is 2.4m 3 / h, the amount of product at the top of the tower is 0.72m 3 / h, wherein the ethylene oxide content is 77.75% (wt), the chlorohydrin content is 0.45% (wt), the temperature at the bottom of the tower is 101-102°C, and the temperature at the top of the tower is 49°C. The pressure at the bottom of the tower is a gauge pressure of 15kPa, and the pressure at th...

Embodiment 3

[0050] Embodiment 3 uses 1.7m 3 / h mass concentration is 70% chloroethanol solution and 22.5m 3 / h The milk of lime with a mass concentration of 9.48% is preheated to 85°C and enters the prereactor (the molar ratio of chloroethanol to calcium hydroxide in the milk of lime solution is 0.6). The residence time of the material in the pre-reactor is about 2-3 seconds, and it enters a saponification rectification tower with a diameter of 1000 mm and a total of 17 plates. The position of the feeding plate is the sixth, and the condensation temperature of the top part of the tower is 45 ° C. , the reflux volume is 2.4m 3 / h, the amount of product at the top of the tower is 0.84m 3 / h, wherein the ethylene oxide content is 84.97% (wt), the chlorohydrin content is 0.5% (wt), the temperature at the bottom of the tower is 101-102°C, and the temperature at the top of the tower is 49°C. The pressure at the bottom of the tower is a gauge pressure of 12kPa, and the pressure at the top of ...

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Abstract

The invention relates to a method and equipment for preparing ethylene oxide from high-concentration chloroethanol. The method comprises the following steps: a 50-70wt% chlorohydrin aqueous solution and a lime milk solution are introduced into a pre-reactor and mixed; and the materials which stay and are mixed for 0.05-3 seconds enter a saponification rectifying tower, water vapor is introduced from the bottom of the tower for direct heating, steam at the top of the tower firstly enters a partial condenser, all condensed materials serve as reflux and flow back into the rectifying tower through a reflux tank, uncondensed steam from the partial condenser enters a total condenser to be completely condensed, and the product ethylene oxide is obtained. The saponification rectifying tower is a sieve-plate tower, and a rectifying section, a reaction section and a stripping section are sequentially arranged in the tower from top to bottom. The product yield is higher than 98%; and meanwhile, the amount of tower kettle wastewater and the content of organic matters in the wastewater are reduced.

Description

Technical field: [0001] The invention belongs to the technical field of compound preparation, and in particular relates to a method and process equipment for preparing ethylene oxide by saponification of high-concentration chloroethanol. Background technique [0002] Ethylene oxide is an important raw material for petrochemical production. Ethylene oxide is used to manufacture other chemicals, mainly ethylene glycol. The main end use of ethylene glycol is in the production of polyester polymers and is also used as an automotive coolant and antifreeze. Secondly, it is used to produce ethoxylates, ethanolamine, glycol ether, ethyleneamine, diethylene glycol, triethylene glycol, polyethylene glycol, hydroxyethyl cellulose, choline chloride, glyoxal, ethylene carbonate Esters and other downstream products. [0003] At present, there are two main production methods of ethylene oxide, namely the chlorohydrin method and the direct oxidation method of ethylene. Chlorohydrin metho...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/26B01D3/00B01D3/16
CPCC07D303/04C07D301/26B01D3/009B01D3/16
Inventor 吕建华刘继东
Owner HEBEI UNIV OF TECH
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