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Method for preparing prenol by isomerizing 3-methyl-3-butene-1-ethanol

A technology of prenol and isomerization, which is applied in the field of preparing prenol, can solve the problems of expensive catalyst operation, equipment requirements and high risk, and achieve the effect of simple and stable composition, high safety and low energy consumption

Inactive Publication Date: 2012-10-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the isomerization and transposition reaction of 3-methyl-3-buten-1-ol is mainly in hydrogen atmosphere, and the catalyst is Pd-Se-Ce / SiO 2 , Pt / Al 2 0 3 , or Pd / C, etc., the catalyst is expensive and has high requirements for operation and equipment, and is highly dangerous

Method used

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  • Method for preparing prenol by isomerizing 3-methyl-3-butene-1-ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Take 100g of 3-methyl-3-buten-1-ol (purity 98%), and sodium hydroxide aqueous solution (concentration 30%) 20g, add 250mL reaction flask and heat to 80 ℃ and stir for 3 hours. Then take the reaction solution, carry out rectification and separation, recover the reaction raw materials and remove part of the by-products, the purity of prenol is 98.25% after detection, and the yield is 30%. The recovered raw materials can be used to continue the reaction.

Embodiment 2

[0022] Example 2 has the same conditions as Example 1 but the catalyst is an aqueous solution of sodium carbonate (concentration: 30%). The purity of prenol is 98.15% and the yield is 27%.

Embodiment 3

[0023] Example 3 has the same conditions as Example 1, but the catalyst is potassium carbonate solid 20g, the purity of prenol is 98.32% after detection, and the yield is 35%.

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Abstract

The invention relates to a method for preparing prenol by isomerizing 3-methyl-3-butene-1-ethanol. The novel catalyst is advantaged in stable component, simple apparatus and process, and high-pressure hermetic operation, no hydrogen atmosphere is needed, so that the safety is high, and the energy consumption is low, and the industrialized implementation is facilitated.

Description

technical field [0001] The invention relates to a method for preparing isopentenol, in particular to a method for preparing isopentenol by isomerizing 3-methyl-3-buten-1-ol under normal pressure under the action of a catalyst. Background technique [0002] The chemical name of isopentenol is 3-methyl-2-butenol, which is an intermediate for the synthesis of many chemical products such as spices, medicines and pesticides. It is an important intermediate for the synthesis of citral and an important raw material for synthetic rubber. , used in the synthesis of permethrin insecticides and other fine chemicals. Its main synthetic routes are as follows: ①Using isobutene as raw material, it is prepared through Prince condensation reaction with formaldehyde; ②Using isoprene as raw material, it reacts with hydrogen chloride, hydrolyzes with sodium acetate, and finally adds sodium hydroxide solution to reflux for 3 One-step reaction to obtain isopentenol; ③ methyl butenol isomerizatio...

Claims

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Application Information

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IPC IPC(8): C07C33/03C07C29/56
Inventor 张树军刘桂龙李秀平李正名许寒郑占英
Owner NANKAI UNIV
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