Preparation method of isopentenyl alcohol

Abstract

The invention discloses a preparation method of isopentenyl alcohol. The preparation method includes: in a hydrogen atmosphere, taking 5% Pd / C as the main catalyst, and in the presence of a cocatalyst, conducting isomeric transformation of the raw material 3-methyl-3-butene-1-ol into isopentenyl alcohol; specifically, mixing the main catalyst and the cocatalyst that are evenly mixed in a weight ratio with the reaction raw material uniformly, carrying out constant temperature heating reaction at 50DEG C-110DEG C for 60-100min, and then ending the reaction. The preparation method of isopentenyl alcohol provided by the invention can well inhibit the generation of the hydrogen reaction product isoamyl alcohol, the yield of the hydrogen reaction product can be inhibited below 7%, and a good effect can be achieved at high temperature, the rise of temperature also changes the balance, so that the content of the target product is increased, and the one-time conversion rate of the raw material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and specifically relates to a preparation method of prenyl alcohol. Background technique [0002] Prenol, namely 3-methyl-2-buten-1-ol, is a colorless transparent liquid with a density of 0.848 and a boiling point of 140°C. It is soluble in organic solvents such as alcohol and ether. It is a synthetic It is an important raw material for products such as citral, vitamin A, vitamin E, etc., and with people's research on the application of prenol, its application scope and demand will also increase significantly, so strengthen the production process of prenol It is of great significance and value to study, improve productivity and reduce production cost. [0003] The synthetic method of isopentenol is more according to different kinds of raw materials, and one of them is to form isopentenol by hydrogen isomerization with 3-methyl-3-buten-1-alcohol as raw material, and this method ...

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Problems solved by technology

[0003] The synthetic method of isopentenol is more according to different kinds of raw materials, and one of them is to form isopentenol by hydrogen isomerization with 3-methyl-3-buten-1-alcohol as raw material, and this method is because raw material is easy to obtain , cheap, and become a hot spot in the research of prenol production; it is recorded in U.S. Patent US4310709A that Pd / C alone is used to catalyze 3-methyl-3-buten-1-ol, and when the effect is the best, the prenol product contains 57%, and the isoamyl alcohol of the hydrogenation product exceeds 6%. Through improvement, adding Se to Pd / C, the isopentenol product can reach 64% when the effect is the best, and the isoamyl alcohol content of the hydrogenation product is at least 2%; It is recorded in the patent CN101544538A that Pd is supported on Al 2 o 3 On the other hand, the catalytic reaction time is shortened and the efficiency is improved, but the high content of isoamyl alcohol in the hydrogenated product is not solved, and the effective conversion rate of raw materials is still low. In order to solve this problem, the present invention provides the following technical solutions

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