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Method for preparing isopentene acetate by taking acetic acid and isoprene as raw materials

A technology of isopentenyl acetate and isoprene, which is applied in the field of compound preparation, can solve problems such as difficult product separation, easy loss of metal active components, poor stability, etc., to achieve reduced polymerization reactions and good product selectivity , reducing the effect of selectivity

Pending Publication Date: 2021-02-05
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is that the acid catalyst used in the current addition esterification process is difficult to separate from the product, and the metal active component is easy to lose and has poor stability.

Method used

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  • Method for preparing isopentene acetate by taking acetic acid and isoprene as raw materials
  • Method for preparing isopentene acetate by taking acetic acid and isoprene as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Sulfonic acid group strongly acidic resin solid acid catalyst adopts D005-II resin (Dandong Mingzhu Special Resin Co., Ltd.). Before use, soak in 10 times the volume of deionized water for 24 hours at room temperature, filter the water, add 10 times the volume of deionized water and soak for 1 hour, repeat the treatment 3 times, and then use 10 times the volume of absolute ethanol Soak for 1 hour, repeat the treatment 3 times, and finally dry at 80°C for 10 hours under a nitrogen atmosphere.

[0024] Take 0.5g of the dried catalyst and put it into a 25ml slurry bed reactor, add 1ml of isoprene and 20ml of acetic acid respectively, add a Teflon stirrer, seal it and react at 40°C, normal pressure and 1000rpm stirring speed for 4h .

Embodiment 2

[0026] The amount of acetic acid added is 10ml. Other conditions are identical with embodiment 1.

Embodiment 3

[0028] The amount of acetic acid added is 2.5ml. Other conditions are identical with embodiment 1.

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Abstract

The invention discloses a method for preparing isopentene acetate by taking acetic acid and isoprene as raw materials. The method comprises the step of carrying out liquid-phase catalytic addition esterification reaction on acetic acid and isoprene under the action of a solid acid catalyst to prepare isopentene acetate. The reaction is carried out in a fixed bed reactor or a slurry bed reactor. The solid acid catalyst in the slurry reactor process is insoluble in the reaction slurry so that the solid acid catalyst can be recycled through a simple liquid-solid separation means, and good productselectivity can be obtained. The fixed bed process can greatly reduce the generation of isoprene oligomerization products, improve the selectivity of the target product, and greatly improve the stability of the catalyst in the addition esterification process.

Description

technical field [0001] The invention relates to the technical field of compound preparation, in particular to a method for preparing prenyl acetate by using acetic acid and isoprene as raw materials through addition esterification. Background technique [0002] Prenyl acetate is a kind of fine chemicals with high economic value. Because of its strong fruity taste and flavor similar to pear and banana, it is called pitol ester; and because of its easy diffusion, it is widely used as a commodity in fragrance products. In addition, isopentenyl acetate is also an important intermediate in the production of other spices and pesticides. For example, Chinese patent CN201710383649.X describes a method for producing prenol by transesterifying prenyl acetate with methanol. Isopentenol is mainly used to react with trimethyl orthoacetate or ethyl acetate to synthesize methyl or ethyl perethinate, which is an important raw material for preparing pyrethroid key intermediate homo-cis per...

Claims

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Application Information

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IPC IPC(8): C07C69/145C07C67/04
CPCC07C67/04C07C69/145Y02P20/584
Inventor 林荣和丁云杰
Owner ZHEJIANG NORMAL UNIVERSITY
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