Technical method for preparing 2-ethyl-2-hexenal by catalyzing self-condensation of n-butyraldehyde with acidic ionic liquid

The technology of an acidic ionic liquid and a process method, applied in the field of green chemistry, can solve the problems that the liquid alkali catalyst cannot be reused, the stability of the solid alkali catalyst is poor, and the cost of treating the three wastes is high, achieves good industrial application prospects, and overcomes the cumbersome post-processing process. , the effect of high thermal stability and chemical stability
CN102701926AActive Publication Date: 2012-10-03HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEBEI UNIV OF TECH
Publication Date
2012-10-03

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Abstract

The invention relates to a technical method for preparing 2-ethyl-2-hexenal by catalyzing self-condensation of n-butyraldehyde with an acidic ionic liquid. The technical method comprises the following steps: adding the n-butyraldehyde and an acidic ionic liquid catalyst into a high-pressure autoclave, wherein the using amount of the acidic ionic liquid catalyst is 1-50 percent of the mass of the n-butyraldehyde; and magnetically stirring at 50-150 DEG C and reacting for 0.5-12h, wherein after self-condensation reaction of the n-butyraldehyde, the 2-ethyl-2-hexenal is obtained and the acidic ionic liquid catalyst is a Bronsted acidic ionic liquid or a Lewis acidic ionic liquid. The Bronsted acidic ionic liquid catalyst and the Lewis acidic ionic liquid catalyst are high in catalytic activity, good in selectivity, mild in reaction conditions and reusable; the conversion rate of the n-butyraldehyde is as high as 94.5%; the highest selectivity of the 2-ethyl-2-hexenal is 99.3%; and the acidic ionic liquid catalyst has higher catalytic performance than the traditional industrial liquid alkali catalyst and has a good prospect for industrial application.
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Description

technical field

[0001] The invention relates to the technical field of green chemistry, in particular to a process for preparing 2-ethyl-2-hexenal by catalyzing the self-condensation of n-butyraldehyde with an acidic ionic liquid. Background technique

[0002] The self-condensation of n-butyraldehyde to prepare 2-ethyl-2-hexenal (that is, octenal) is a typical aldol condensation reaction, which can be carried out under the condition of acid or base catalyst. Due to the strong electronegativity of the oxygen atom, the carbonyl group has an electron-withdrawing inductive effect; in addition, the carbon-hydrogen bond on the α-carbon of the carbonyl group has a σ-π hyperconjugation effect with the carbonyl group. The combined effect of inductive effect and hyperconjugation effect makes the hydrogen on the α-carbon atom active, and the active α-hydrogen can move between the α-carbon and carbonyl oxygen. Therefore, carbonyl compounds exist in a pair of tautomers, ie, keto and eno...

Claims

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