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Catalyst for ethylene oxide ring-opening reaction and preparation method for oxethyl compound

An ethoxy compound and ethylene oxide technology, which is applied in the field of catalysts for ethylene oxide ring-opening reaction, can solve the problems of multiple by-products, high use cost, and few, etc., and achieves easy mixing and configuration and catalytic reaction efficiency. high effect

Inactive Publication Date: 2018-02-06
辽宁奥克药业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the use of acid catalysts will lead to more by-products, acid catalysts are rarely used in practical applications
[0005] However, the base catalysts currently used are all solid, so they need to be fully mixed with aliphatic alcohols to dissolve them to play a catalytic role. At the same time, these catalysts cannot be recycled after the reaction, which makes the catalysts have low catalytic efficiency and cost. high

Method used

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  • Catalyst for ethylene oxide ring-opening reaction and preparation method for oxethyl compound
  • Catalyst for ethylene oxide ring-opening reaction and preparation method for oxethyl compound
  • Catalyst for ethylene oxide ring-opening reaction and preparation method for oxethyl compound

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preparation example Construction

[0016] The preparation method of the ethoxy compound of one embodiment of the present invention comprises reacting starter and ethylene oxide under the effect of above-mentioned catalyst to prepare ethoxy compound.

[0017] In one embodiment of the present invention, the initiator can be C 1 ~C 20 Aliphatic alcohols such as methanol, ethanol, butanol, tert-butanol, octanol, dodecyl alcohol, tetradecyl alcohol, cetyl alcohol, oleyl alcohol, stearyl alcohol, allyl alcohol, methallyl alcohol, Prenyl alcohol, ethylene glycol, diethylene glycol, triethylene glycol, glycerin, etc.

[0018] In one embodiment of the present invention, the consumption of catalyst can be 0.05%~2%, such as 0.1%, 0.5%, 1% of the mass of product ethoxylate compound (the sum of reactant initiator and ethylene oxide mass) , 1.5%, etc.

[0019] In one embodiment of the present invention, according to the performance requirements of the target product ethoxylate, the reaction of different epoxide addition n...

Embodiment 1

[0023] At room temperature, add 64g of methanol and 0.05g of [EMIM][AC] into a 200mL autoclave, seal it, replace it with nitrogen three times, then raise the temperature to 60°C, then add ethylene oxide in batches, and maintain the reaction during the addition The pressure is about 0.5MPa. After adding the required 26g of ethylene oxide, continue aging for 0.5h until the reaction pressure no longer decreases, then cool down and exit the kettle. The product of gained is distilled, and ethylene glycol monomethyl ether 43g is collected, and it is compared with standard sample, and its purity is 99.2% with Agilent gas chromatographic analysis.

[0024] The still residue of distillation gained is used as catalyst, continues to repeat above reaction, can collect ethylene glycol monomethyl ether 42.3g, shows that [EMIM][AC] ionic liquid catalyst can be recycled.

Embodiment 2

[0026] At room temperature, add 74g of n-butanol and 0.2g of [BMIM][AC] into a 200mL autoclave, seal it, replace it with nitrogen three times, then raise the temperature to 90°C, then add ethylene oxide in batches, during the addition process Keep the reaction pressure at about 0.6MPa, after adding the required 35g of ethylene oxide, continue aging for 0.5h until the reaction pressure no longer drops, then cool down and exit the kettle. The product of gained is distilled, and ethylene glycol monobutyl ether 52g is collected, and it is compared with standard sample, and its purity is 99.5% with Agilent gas chromatographic analysis.

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Abstract

The invention provides a catalyst for ethylene oxide ring-opening reaction and a preparation method for an oxethyl compound. The catalyst comprises one or more of imidazole acetate, quaternary ammonium acetate and pyridine acetate. The catalyst in the execution mode of the invention is ionic liquid; the ionic liquid is under a liquid state, so that the catalyst is easily mixed with an initiator ofthe ring-opening reaction; besides, the catalytic reaction efficiency is higher under the synergistic effect of alkaline group of ionic liquid and hydrogen bond.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for ring-opening reaction of ethylene oxide. Background technique [0002] Ethoxylates (such as aliphatic alcohol ethoxylates) are an important class of organic compounds. According to their different structures, they are widely used in fields such as daily chemicals, textile chemicals, oil fields, coatings, and pesticides. The usual preparation method is to use the ring-opening reaction of oxirane, that is, react the initiator (such as aliphatic alcohol) and oxirane under the action of a catalyst to obtain ethoxylates. The reaction equation is as follows . [0003] [0004] Conventional catalysts include bases and acids, wherein base catalysts include: sodium hydroxide, potassium hydroxide, sodium alkoxide, potassium alkoxide, sodium hydride, potassium hydride, sodium acetate, barium hydroxide, etc.; acid catalysts include: three boron fluoride etc. Because the use of acid catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/04C07C41/03C07C43/13C07C43/11C07C43/178C08G65/28
CPCB01J31/0279B01J31/0281B01J31/0284C07C41/03C08G65/2609C08G65/2672C07C43/13C07C43/135C07C43/11C07C43/1785
Inventor 朱建民刘兆滨仲崇纲陈杨英
Owner 辽宁奥克药业股份有限公司
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