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Separation method of ethylene glycol, propylene glycol and butanediol

A technology of ethylene glycol and butanediol, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem of high energy consumption

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of high energy consumption when ethylene glycol, propylene glycol and butanediol are separated by azeotropic rectification at present, and a new separation method of ethylene glycol, propylene glycol and butanediol is provided

Method used

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  • Separation method of ethylene glycol, propylene glycol and butanediol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] according to figure 1 Shown flow process, raw material 4 (ethylene glycol mass fraction is 90%, and 1,2-propanediol mass fraction is 7%, and 1,2-butanediol mass fraction is 3%) and extraction agent 5 respectively from theoretical plate number The top and the bottom of extraction tower 1 that is 15 enter, and raw material flow rate is 5 g / min, and extractant is selected toluene for use, and extractant and raw material mass ratio are 0.5, and operating pressure is normal pressure, and operating temperature is 40 ℃, and the tower top obtains extraction Phase 6, the raffinate phase 7 is obtained at the bottom of the tower; the extraction phase 6 enters the 15th plate of the extractant recovery tower 2 with a theoretical plate number of 20, the operating pressure is 10KPa, the reflux ratio is 0.5, and the extraction control at the top of the tower does not contain 1, 2-butanediol, the tower top obtains reclaiming extraction agent 8, and tower still obtains the toluene soluti...

Embodiment 2

[0016] according to figure 1 Shown flow process, raw material 4 (ethylene glycol mass fraction is 60%, and 1,2-propanediol mass fraction is 15%, and 1,4-butanediol mass fraction is 25%) and extraction agent 5 respectively from theoretical plate number The top and the bottom of extraction tower 1 that is 40 enter, and feed flow rate is 5 g / min, and extractant selects ortho-xylene for use, and extractant and raw material mass ratio are 2, and operating pressure is normal pressure, and operating temperature is 50 ℃, tower top Extraction phase 6 is obtained, and the raffinate phase 7 is obtained at the bottom of the tower; the extraction phase 6 enters the 15th plate of the extractant recovery tower 2 with a theoretical plate number of 40, the operating pressure is 50KPa, and the reflux ratio is 0.2, and the extraction control at the top of the tower does not contain 1,4-butanediol, the recovery extractant 8 is obtained at the top of the tower, and the ortho-xylene solution 9 rich...

Embodiment 3

[0018] according to figure 1 Shown flow process, raw material 4 (ethylene glycol mass fraction is 50%, and 1,3-propanediol mass fraction is 30%, and 1,3-butanediol mass fraction is 20%) and extraction agent 5 respectively from theoretical plate number The top and the bottom of extraction tower 1 that is 5 enter, and raw material flow rate is 5 g / min, and extractant selects isopropyl benzene for use, and extractant and raw material mass ratio are 5, and operating pressure is normal pressure, and operating temperature is 20 ℃, tower top Extraction phase 6 is obtained, and the raffinate phase 7 is obtained at the bottom of the tower; the extraction phase 6 enters the 6th plate of the extraction agent recovery tower 2 with a theoretical plate number of 10, the operating pressure is 5KPa, and the reflux ratio is 5, and the extraction control at the top of the tower does not contain 1,3-butanediol, the top of the tower is recovered extractant 8, and the tower still is rich in cumene...

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Abstract

The invention relates to a separation method for glycol, propylene glycol and butylene glycol and mainly aims to solve the problem of high energy consumption in separation of glycol, propylene glycol and butylene glycol by using azeotropic rectification in the prior art. The invention comprises the following sequential steps that: a raw material containing glycol, propylene glycol and butylene glycol and an extractant enter into an extraction tower (1) respectively from the top and the bottom of the extraction tower, an extractant material flow I containing butylene glycol is obtained at tower top, and glycol material flow II containing propylene glycol is obtained at tower bottom; the material flow I enters into the central part of an extractant recovery tower (2), the recovered extractant is obtained at tower top, and an extractant solution containing butylene glycol is obtained at tower bottom; the material flow I enters into the central part of a glycol treating tower (3), a solution containing propylene glycol and the extractant is obtained at tower top, and the product of glycol is obtained at tower bottom. The method provided in the invention enables the above-mentioned problem to be well overcome and can be used in industrial production for separation of glycol, propylene glycol and butylene glycol.

Description

technical field [0001] The invention relates to a method for separating ethylene glycol, propylene glycol and butanediol. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material, mainly used in the production of polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, nonionic surfactant and explosives, etc. It can be used in industries such as paint, photographic developer, brake fluid and ink, as a solvent and medium for ammonium perborate, and for the production of special solvents such as glycol ether, etc., and has a wide range of uses. [0003] At present, large-scale ethylene glycol production at home and abroad adopts the process route of direct hydration or pressurized hydration. This process is to prepare a mixed aqueous solution of ethylene oxide and water at a ratio of 1:20 to 22 (molar ratio) in a fixed bed. React in the reactor at 130-180°C, 1.0-2.5MPa for 18-30 minutes, all ethylene oxide is co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/76C07C29/86
Inventor 肖剑钟禄平郭艳姿鞠凡
Owner CHINA PETROLEUM & CHEM CORP