Separation method for glycol, propylene glycol and butylene glycol

A separation method, ethylene glycol technology, 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: 2012-03-14
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 for glycol, propylene glycol and butylene glycol
  • Separation method for glycol, propylene glycol and butylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] press figure 1 In the process shown, raw material 4 (90% ethylene glycol, 7% 1,2-propanediol, 3% 1,2-butanediol) and extractant 5 are calculated from the theoretical plates. The 15 extraction tower 1 enters the top and bottom, the raw material flow rate is 5 g / min, the extractant is toluene, the mass ratio of the extractant to the raw material is 0.5, the operating pressure is normal pressure, and the operating temperature is 40°C. The top of the tower is extracted Phase 6, the bottom of the tower obtains the raffinate phase 7; the extraction phase 6 enters the 15th plate of the extraction agent recovery tower 2 with a theoretical plate number of 20, the operating pressure is 10KPa, the reflux ratio is 0.5, and the top production control does not contain 1, 2-Butanediol, extractant 8 is recovered at the top of the tower, and a toluene solution rich in 1,2-butanediol 9 is obtained from the bottom of the tower; the raffinate phase 7 enters the second stage of the ethylene ...

Embodiment 2

[0016] press figure 1 In the process shown, the raw material 4 (the mass fraction of ethylene glycol is 60%, the mass fraction of 1,2-propanediol is 15%, the mass fraction of 1,4-butanediol is 25%) and the extractant 5 are calculated from the theoretical plates. The top and bottom of the extraction tower 1 of 40 enter, the raw material flow rate is 5 g / min, the extractant is o-xylene, the mass ratio of the extractant to the raw material is 2, the operating pressure is normal pressure, the operating temperature is 50 ℃, and the top of the tower The 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 extraction agent recovery tower 2 with a theoretical plate number of 40, the operating pressure is 50KPa, the reflux ratio is 0.2, and the top extraction control does not contain 1,4-butanediol, extracting agent 8 is recovered from the top of the tower, o-xylene solution 9 rich in 1,4-bu...

Embodiment 3

[0018] press figure 1 In the process shown, raw material 4 (50% ethylene glycol, 30% 1,3-propanediol 30%, and 20% 1,3-butanediol) and extractant 5 are calculated from theoretical plates. The top and bottom of the extraction tower 1 of 5 enter, the raw material flow rate is 5 g / min, the extractant is cumene, the mass ratio of the extractant to the raw material is 5, the operating pressure is normal pressure, and the operating temperature is 20℃. The extraction phase 6 is obtained, and the raffinate phase 7 is obtained at the bottom of the tower; the extraction phase 6 enters the sixth plate of the extraction agent recovery tower 2 with a theoretical plate number of 10, the operating pressure is 5KPa, the reflux ratio is 5, and the top production control does not contain 1,3-Butanediol, extractant 8 is recovered at the top of the tower, cumene solution 9 rich in 1,3-butanediol is obtained from the bottom of the tower; raffinate phase 7 enters the ethylene glycol refinement with a...

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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 butylene glycol. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material, which is mainly used to produce polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, non-ionic surfactant and explosives, etc. It can be used in coatings, photographic developer, brake fluid, ink and other industries, used as a solvent and medium for ammonium perborate, and used in the production of special solvent glycol ethers. It has a wide range of uses. [0003] At present, large-scale ethylene glycol production at home and abroad adopts the direct hydration or pressurized hydration process. The process is to mix ethylene oxide and water into a mixed aqueous solution at a ratio of 1:20-22 (molar ratio). React in the reactor at 130~180℃, 1.0~2.5MPa for 18~30min, all ethylene oxide will be converted into mixed alcohol, and the c...

Claims

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Application Information

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