Method for preparing isopentenol from 3-methyl-3-butenol

A technology of isopentenol and butenol, applied in the direction of isomerization preparation, organic chemistry, etc., can solve the problems of increased production cost, low reactivity, capacity constraints, etc.

Active Publication Date: 2009-09-30
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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Problems solved by technology

If this method is implemented industrially, the lower reactivity will undoubtedly

Method used

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  • Method for preparing isopentenol from 3-methyl-3-butenol
  • Method for preparing isopentenol from 3-methyl-3-butenol

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Embodiment 1～10

[0017] Add 30 grams of 3-methyl-3-butenol into a 100 ml three-necked flask, and place the flask in an oil bath. Add the catalyst according to the required ratio, the catalyst is Al 2 o 3 It is used as a carrier to load the active component metal Pd, and the particle size of the catalyst is 80-200 mesh. Under normal pressure, hydrogen or nitrogen-hydrogen mixed gas is continuously introduced into the material at a flow rate of 25ml / min. After the air in the flask is removed, the material is stirred and heated, and kept at a constant temperature after being heated to the required reaction temperature. until the end of the reaction. After the reaction product is cooled, the catalyst is removed by filtration, the composition of the reaction solution is obtained through gas chromatography analysis, and the selectivity and yield of the product prenol are calculated.

[0018] The catalyst active component content, catalyst consumption and concrete reaction conditions that each emb...

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Abstract

The invention relates to a method for preparing isopentenol from 3-methyl-3-butenol, which performs isomerization reaction on a raw material of 3-methyl-3-butenol to generate the isopentenol in the presence of a catalyst in an atmosphere containing hydrogen, wherein the reaction pressure is normal pressure, the reaction temperature is between 50 and 90 DEG C, the reaction time is between 25 and 40 minutes, the catalyst uses Al2O3 as a carrier, a load active component is metal Pd, the content of the Pd in the catalyst in percentage by weight is between 0.1 and 2.0 percent, the particle size of the catalyst is between 80 and 200 meshes, and the weight ratio of the raw material to the catalyst is 30-100:1. Compared with the prior art, the method has obvious improvement, the catalyst is simpler, and the content of the active component is lower, thus the preparation is easier and the cost is lower; the reaction condition is mild; and on the premise of ensuring the selectivity and the product yield of a perfect product, the reaction time is greatly shortened. The reduction of the preparation cost of the catalyst and shortening of the reaction time finally reduce the overall production cost greatly.

Description

technical field [0001] The present invention relates to a process for the preparation of prenol from 3-methyl-3-butenol, in particular to 3-methyl-3-butenol in the presence of a catalyst containing Pd, and in an atmosphere containing hydrogen Process for the preparation of prenol by isomerization. Background technique [0002] The chemical name of prenol is 3-methyl-2-butenol, which is an important organic intermediate and can be used in the production of various fine chemical products and pharmaceuticals such as citral, floral fragrance and vitamin A. The traditional method for producing prenol is mainly the isoprene method, that is, isoprene is used as a raw material to prepare prenol through processes such as chlorination, esterification, and saponification in alkaline solution. This method has a long process route, large consumption of raw materials, many by-products, relatively high production cost and serious pollution, and its prospect is worrying. [0003] In recen...

Claims

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Application Information

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IPC IPC(8): C07C29/56C07C33/025
Inventor 朱志庆孙敏达谢家明吕自红
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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