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Homogeneous catalyst for preparation of ethylene glycol by ethylene oxide hydration

A technology of ethylene oxide water and homogeneous catalyst, which is applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, hydroxyl compound preparation, etc., can solve the difficulty of catalyst separation, recovery and recycling, The problems of low ethylene glycol selectivity and large amount of catalyst can achieve the effect of high catalytic activity and selectivity, shortening reaction time and improving selectivity.

Inactive Publication Date: 2005-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that there is a large amount of catalyst used in the prior art, difficulty in catalyst separation and recycling, and long reaction time or long reaction time and low selectivity of ethylene glycol when no catalyst is used. A new homogeneous catalyst for the hydration of ethylene oxide to ethylene glycol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take by weighing 34.2 grams of ethylene oxide, 200 grams of water, 0.023 grams of catalyzer aluminum perchlorate (catalyst consumption 100PPM in the reaction medium), add in 500 milliliters of stainless steel autoclaves, electric heating control reaction temperature 150 ℃, reaction pressure is 2.0 MPa, the reaction time is 6.0 minutes, stop the reaction, take a sample and analyze the reaction liquid after cooling, the conversion rate of ethylene oxide is 100%, and the selectivity of ethylene glycol is 92.1%.

Embodiment 2

[0021] Take by weighing catalyzer aluminum perchlorate 0.17 gram (catalyst consumption 50PPM in reaction medium), be dissolved in 3000 gram waters, the above-mentioned container that the water that is dissolved with catalyzer is housed is placed on electronic balance, the ethylene oxide is housed The steel cylinder is placed on another electronic scale, and two metering pumps are used to feed the aqueous solution with catalyst and ethylene oxide to the continuous tubular reactor respectively. The amount of feed is adjusted and controlled by the metering pump according to the reading of the electronic scale. The aqueous solution and ethylene oxide enter the tubular reactor after being fully mixed by the static mixer. The continuous tubular reactor is a stainless steel tube with a length of 120 meters and a diameter of φ3 mm (the inner diameter of the tube is φ2 mm, and the reactor volume is 376 milliliters). In oil bath, control reaction temperature at 150 ℃, reaction pressure 1...

Embodiment 3

[0023]Weigh 34.1 grams of ethylene oxide, 200 grams of water, and 0.12 grams of catalyst aluminum trifluoromethanesulfonate (the amount of catalyst in the reaction medium is 500PPM), put them into a 500 ml stainless steel autoclave, and control the reaction temperature by electric heating to 150°C , the reaction pressure was 1.4 MPa, the reaction time was 10 minutes, the reaction was stopped, and the reaction liquid was cooled and then sampled for analysis. The conversion rate of ethylene oxide was 100%, and the selectivity of ethylene glycol was 88.9%.

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Abstract

A homogenizing catalyst for preparing ethanediol from epoxy ethane by hydration is the neutral salt or weakly acidic salt or their mixture, which can be dissolved in reaction medium. Its advantage is high selectivity.

Description

technical field [0001] The invention relates to a homogeneous catalyst for hydration of ethylene oxide to prepare ethylene glycol. Background technique [0002] Ethylene Glycol (EG or MEG for short), commonly known as glycol, is an important aliphatic dihydric alcohol. [0003] Ethylene glycol has a wide range of uses, the largest use is the production of polyester resins, including fibers, films and engineering plastics. It can also be directly used as coolant and antifreeze, and it is also an indispensable substance in the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0004] The direct hydration method of ethylene oxide is the only method for industrial production of ethylene glycol today, and the production technology is monopolized by Shell, SD, and UCC. About 70% of the ethylene glycol plants in the world use the technologies of SD and Shell. The molar ratio of water a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04C07C29/00C07C31/08
CPCY02P20/52
Inventor 陈永福费泰康张卫东
Owner CHINA PETROLEUM & CHEM CORP
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