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Method for recovering alkylene oxide

A technology of alkylene oxide and recovery method, which is applied in the direction of organic chemistry, can solve the problems of ineffective recycling of alkylene oxide, achieve the effect of solving the problem of VOCs emission, reducing the content of alkylene oxide, and good technical effects

Active Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that in the prior art, the chemical method used in the treatment of alkylene oxide tail gas requires chemical action through water or organic amines, which brings new separation equipment or energy consumption, or cannot be effectively recovered Use of alkylene oxides and other issues
[0010] In the prior art, there is no report on using a physical adsorption method when dealing with alkylene oxide tail gas. The second technical problem to be solved by the present invention is that when physical adsorption is used in the treatment of alkylene oxide tail gas, the introduced absorbent needs to be further processed. Separation, which brings problems such as new separation equipment or energy consumption

Method used

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  • Method for recovering alkylene oxide
  • Method for recovering alkylene oxide
  • Method for recovering alkylene oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 , shown in 2, by sending tail gas (1) containing propylene oxide, nitrogen, water, acetaldehyde into compressor A, after pressurization (2), it enters cooler B for cooling, and cooling liquid (3) enters gas-liquid separation After the gas-liquid separation of device C, the gas phase (4) enters from the bottom of the absorption tower D, the cold extractant (6) enters from the middle and upper part of the tower, the gas phase (7) on the top of the absorption tower is removed from the torch and other post-treatments, and the liquid phase of the tower kettle (8 ) and the liquid phase (5) at the bottom of the gas-liquid separator (9) are sent to the middle and lower part of the extractive distillation tower E of the propylene oxide refining unit, and the extractant feed is fed to the top of the extractive distillation tower E (12) feed, and 13 is the extraction The middle and upper product of rectification tower E tower, 14 is the bottom product of extractiv...

Embodiment 2

[0059] With embodiment 1, cold extraction agent (6) enters from tower top, and the molar composition of the tail gas containing propylene oxide, nitrogen, water, acetaldehyde etc. is 50% of propylene oxide, water 50ppm, acetaldehyde 10ppm, and remaining composition Divided into nitrogen. The outlet pressure of the compressor is 0.40MPaG.

[0060] The outlet temperature of the cooler was 10°C.

[0061] The ratio of the amount of extraction agent added to the gas phase feed amount of the absorption tower tank is 2:1.

[0062] The operating pressure of the gas-liquid separator is 0.38MPaG.

[0063] The operation mode of the gas-liquid separator is adiabatic flash evaporation, and the heat load is 0.

[0064] The operating pressure of the absorption tower is 0.36MPaG.

[0065] The number of theoretical plates of the absorption tower is 5.

[0066] The absorbent is the same as the extractant of the propylene oxide refining unit, both are n-octane, and the feed temperature of t...

Embodiment 3

[0069] With embodiment 1, cold extraction agent (6) enters from tower top, and the molar composition of the tail gas that contains propylene oxide, nitrogen, water, acetaldehyde etc. is propylene oxide 50%, water 50ppm, acetaldehyde 10ppm, remaining composition Divided into nitrogen. The outlet pressure of the compressor is 0.40MPaG.

[0070] The outlet temperature of the cooler was 10°C.

[0071] The ratio of the amount of extraction agent added to the gas phase feed amount of the absorption tower tank is 2:1.

[0072] The operating pressure of the gas-liquid separator is 0.38MPaG.

[0073] The operation mode of the gas-liquid separator is adiabatic flash evaporation, and the heat load is 0.

[0074] The operating pressure of the absorption tower is 0.36MPaG.

[0075] The number of theoretical plates of the absorption tower is 15.

[0076] The absorbent is the same as the extractant of the propylene oxide refining unit, both are n-octane, and the feed temperature of the ...

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Abstract

The invention relates to a recovery method for alkylene oxide. The method comprises: feeding tail gas containing alkylene oxide, nitrogen, water and acetaldehyde into a pressurizing unit (such as a compressor); pressurizing; feeding into a cooler, and cooling; carrying out gas-liquid separation on the cooling liquid by a gas-liquid separator; making the gas phase enter the bottom of an absorptiontower, and making a cold extracting agent enter the middle upper portion of the tower; and carrying out post-treatment such as flare removal and the like on the gas phase at the top of the absorptiontower, mixing the tower kettle liquid phase and the liquid phase at the bottom of the gas-liquid separator, and feeding the mixture into the extractive rectification tower of an alkylene oxide refining unit to recover alkylene oxide, so that the alkylene oxide in the tail gas can be effectively recovered, the content of the alkylene oxide in the discharged tail gas is reduced, the VOCs discharge problem is effectively solved, and the method is used for industrial production of an alkylene oxide device.

Description

technical field [0001] The present invention relates to a kind of recovery method that is used for alkylene oxide, mainly relates to the field of alkylene oxide production, specifically, relates to a kind of cumene hydroperoxide (CHP), and / or ethylbenzene hydroperoxide (EBHP) ), and / or tert-butanol hydroperoxide (TBHP) and propylene, and / or butene generation epoxidation reaction product technology. Background technique [0002] Propylene oxide (PO) is the third largest propylene derivative after polypropylene and acrylonitrile. As an important basic organic chemical raw material, the largest industrial use of propylene oxide is for the production of polyether polyols, as well as for propylene glycol, fourth-generation detergent nonionic surfactants, oil field demulsifiers, pesticide emulsifiers and wetting agents. agent etc. [0003] Butylene oxide (BO) has similar chemical properties to propylene oxide, and can also be used as a raw material monomer for polyether polyols....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/32C07D303/04
CPCC07D301/32C07D303/04
Inventor 胡松杨卫胜
Owner CHINA PETROLEUM & CHEM CORP
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