Catalyst for preparing prenyl alcohol from isopentenyl acetate through transesterification and application of catalyst

Abstract

The invention relates to a catalyst and reaction process for preparing prenyl alcohol from isopentenyl acetate through transesterification. The reaction process comprises the step: carrying out transesterification under the action of a solid acid serving as a catalyst by taking isopentenyl acetate and n-alkanol as reaction raw materials to generate prenyl alcohol and certain acetate. The n-alkanolcomprises methanol, ethanol, propanol and butanol, and corresponding certain acetate is methyl acetate, ethyl acetate, propyl acetate and butyl acetate. The solid acid catalyst adopts Ir-Fe / CeO2 / SiO2as a catalyst system. It is particularly noted that an important reaction process step for obtaining a target product with high yield (larger than or equal to 90%) is to firstly introduce H2 for a period of time in a reaction process, and then, turning to introduce N2. The reaction process has the remarkable advantages such as low economic and environmental costs as well as simplicity in productseparation and aftertreatment so as to have a good application prospect.

Description

technical field [0001] The invention relates to a catalyst for preparing isopentenol through transesterification of isopentenyl acetate and a reaction process thereof. Background technique [0002] Pyrethroid fine chemicals are widely used biomimetic insecticides that emerged at the end of the last century. In January 2007, my country introduced five highly toxic and high-residue organophosphorus pesticides such as methamidophos in all regions of the country. Completely banned, pyrethroid pesticides have been vigorously advocated and promoted by the state, and have been considered as the star of hope to replace highly toxic and high-residue organophosphorus pesticides, accounting for more than half of the total usage of urban sanitation pesticides . Today, new insecticide chemicals have been formed after carbamate, organophosphorus, and organochlorine biomimetic insecticides, which is another phased achievement in the historical development of pesticides. It has outstanding ...

AI Technical Summary

Problems solved by technology

[0005] The three relatively mature process routes have their own advantages and disadvantages: (1) the isobutylene method requires a large investment in equipment, harsh reaction conditions, and high production costs

(2) The isoprene method has rich sources of raw materials, obvious production cost advantages, and a gentle reaction process, but the boiling point of isoprene is low, the gas phase reaction is not easy to control, and the vapor toxicity is relatively high, and HCl is extremely corrosive to equipment

(3) Acetone method, acetylene raw material cost is high, process route is long, product yield is low, production cost rises

[0007] At present, the isopentenol reaction carried out by the researchers all adopts the tank reactor, which cannot be continuously reacted, and focuses on the research of the catalyst.

Although some effective catalysts have been invented, they are still unsatisfactory for industrial applications

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