Method for continuously preparing prenol

A technology for prenol and butene, which is applied in the field of continuous preparation of prenol, can solve the problems of difficult separation, high production cost, long reaction time, etc., and achieves the advantages of reducing regeneration links, short reaction period and cost saving. Effect

Active Publication Date: 2019-05-07
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional method for producing isoprenol is the isoprene method, which uses isoprene as a raw material and is prepared through multiple steps such as oxidation, esterification, and saponification. The process route is long, the product selectivity is low, and it is harmful to the environment. serious pollution
[0004] In recent years, isobutene and formaldehyde are used as raw materials to prepare isopentenol. This method is simple in process and less polluting. Isobutene and formaldehyde are condensed to obt

Method used

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  • Method for continuously preparing prenol
  • Method for continuously preparing prenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 2kg of raw materials 3-methyl-3-buten-1-ol, 3kg of methanol, and 20g of sodium methoxide; mix the three materials evenly, pressurize the reaction tube to 10mpa with methanol, and then start feeding, and the mixed material uses a plunger Pump feed, flow rate: 50g / h, control reaction temperature 170°C, control reaction pressure 10mpa, collect reaction liquid, raw material conversion rate: 42%, selectivity of main product is greater than 90%; the obtained reaction liquid is rectified to obtain isopentyl Enol, product purity greater than 99%.

Embodiment 2

[0024] Weigh 2kg of raw materials 3-methyl-3-butene-1-ol, 4kg of methanol, 40g of sodium methoxide; mix the three materials evenly, pressurize the reaction tube with methanol to 12mpa, and then start feeding, and the mixture is fed by a plunger Pump feeding, flow rate: 70g / h, control reaction temperature 190°C, control reaction pressure 12mpa, collect reaction liquid, raw material conversion rate: 45%, main product selectivity greater than 90%; the obtained reaction liquid is rectified to obtain isopentyl Enol, product purity greater than 99%.

Embodiment 3

[0026] Weigh 2kg of raw materials 3-methyl-3-buten-1-ol, 3kg of acetonitrile, 40g of sodium methoxide; mix the three materials evenly, pressurize the reaction tube with methanol to 10mpa, and then start feeding, and the mixture is fed by a plunger Pump feed, flow rate: 70g / h, control reaction temperature 190°C, control reaction pressure 10mpa, collect reaction liquid, raw material conversion rate: 44%, selectivity of main product is greater than 90%; the obtained reaction liquid is rectified to obtain isopentyl Enol, product purity greater than 99%.

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Abstract

The invention discloses a method for continuously preparing prenol. The method comprises the following steps: taking 3-methyl-3-butene-1-ol as a raw material, dissolving a catalyst in the raw material, adding a solvent according to a ratio, pumping the raw material into a reaction tube through a plunger pump under a certain pressure and temperature, carrying out a reaction, cooling the reaction liquid, then collecting the reaction liquid, and carrying out rectifying to obtain a prenol pure product, wherein the purity of the product is greater than 99%. According to the method disclosed by theinvention, preparation is carried out in a continuous mode, and operation is simple and convenient; the preparation is carried out in a non-hydrogen state, the adopted catalyst does not need to be prepared in advance, and precious metals such as palladium, cerium and tellurium are not used, so that production cost is low.

Description

technical field [0001] The invention provides a method for continuously preparing prenol, and relates to the field of fine chemical product production. Background technique [0002] 3-Methyl-2-buten-1-ol, both prenol, is an important organic synthesis intermediate, widely used in the fields of pesticides and synthetic fragrances, as people synthesize prenol With the continuous deepening of the process, its application range will become wider and wider, and the demand will also increase greatly. Therefore, the research on the synthesis technology of prenyl alcohol is of great significance. [0003] The traditional method for producing isoprenol is the isoprene method, which uses isoprene as a raw material and is prepared through multiple steps such as oxidation, esterification, and saponification. The process route is long, the product selectivity is low, and it is harmful to the environment. serious pollution. [0004] In recent years, isobutene and formaldehyde are used a...

Claims

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Application Information

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IPC IPC(8): C07C29/56C07C33/03
Inventor 王蕊王庆吉王建青王炳春李进
Owner CHINA CATALYST HLDG CO LTD
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