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A kind of production technology of industrialized isopentenol

A technology of prenol and production process, applied in the field of industrialized prenol production process, can solve the problems of complex process and high production cost, and achieve the effects of high yield, high selectivity and optimized material consumption

Active Publication Date: 2021-06-22
TIAN JIN AN DE SHENG SCI -TECH SERVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current three synthetic routes have their own advantages and disadvantages. The isoprene method is more suitable for my country’s national conditions, but this process requires catalytic hydrogenation in the presence of precious metals. The process is more complicated and the production cost is higher than the above two methods.

Method used

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  • A kind of production technology of industrialized isopentenol
  • A kind of production technology of industrialized isopentenol
  • A kind of production technology of industrialized isopentenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The mixture of alkaline isobutylene and paraformaldehyde enters the storage tank, wherein the paraformaldehyde has a medium degree of polymerization of 30 and a particle size of 400-800 microns. The molar ratio of basic isobutylene to paraformaldehyde is 12:1.

[0067] The mixed suspension of alkaline isobutylene and paraformaldehyde is kept in a stirring state in the tank, and the mixture is sent to the heat exchanger through a pump to make the temperature of the mixture reach 190 ° C. The heated suspension is sent to a height of 5.5 meters and a diameter of 1.5 In the first plug flow reactor, paraformaldehyde is depolymerized in the first reactor, and the reaction condition is a pressure of 7 MPa for 50 minutes. The end point of the depolymerization reaction is to obtain a mixture of basic isobutylene, free formaldehyde and undepolymerized paraformaldehyde at the top of the reactor at a temperature of 170°C.

[0068] When the mixture enters the second heat exchanger ...

Embodiment 2~4

[0073] Prenol was prepared according to the method in Example 1, except that the temperature and pressure of depolymerization were carried out according to Table 1.

[0074] The temperature and pressure of depolymerization in table 1 embodiment 2~4

[0075]

[0076] It can be seen from Table 1 that during the depolymerization process of the suspension of paraformaldehyde and basic isobutylene at a temperature of 120-220 °C, there is a positive correlation between the reaction parameters temperature and pressure and the depolymerization rate of paraformaldehyde.

Embodiment 5~8

[0078] Prenol was prepared according to the method in Example 1, except that the particle size and concentration of paraformaldehyde in Examples 5-8 were carried out according to Table 2.

[0079] The size and concentration of paraformaldehyde in table 2 embodiment 5~8

[0080]

[0081] Note: "**" means that in Example 8, paraformaldehyde with a particle size of less than 300 μm is used, which is very easy to form large aggregates in the solution. Experiments have proved that isobutylene has no ability to diffuse such large aggregates to form the uniformity required for depolymerization. Mutually. Therefore, if the homogeneous phase required for depolymerization is satisfied, water must be injected, resulting in an increase in energy consumption ratio, which adversely affects the depolymerization process. In addition, due to the presence of moisture, it is difficult to ensure that the water content in the final product is less than 0.1%.

[0082] Concentrations of parafor...

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Abstract

The invention provides a production process of industrialized prenyl alcohol, comprising the following steps: A) depolymerizing paraformaldehyde to generate free formaldehyde; B) contacting the free formaldehyde with alkaline isobutylene, and carrying out Prince react to obtain isopentenol; the basic isobutene includes isobutene and an alkaline medium, and the pH value of the basic isobutene is 7.4 to 7.8. The raw material of the present invention is basic isobutene, and the alkali in basic isobutene can neutralize the formic acid generated by the disproportionation of formaldehyde in the addition reaction, and effectively prevent the side reaction of isobutene dimerization to generate dimethylhexene and trimethylcyclopentane ; Thereby improving the chromaticity of prenyl alcohol product, obtains colorless and transparent prenyl alcohol.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, in particular to a production process of industrial prenol. Background technique [0002] Prenol, namely 3-methyl-3-buten-1-ol (3-Methyl-3-buten-1-ol), relative molecular weight 86.13, density 0.851g / cm 3 (20°C), boiling point 130~132°C (760mmHg), flash point 42°C, colorless and transparent liquid. Isopentenol is mainly used in the synthesis of high-efficiency and low-toxicity pesticides such as pyrethroids, which are intermediates of pyretinic acid methyl ester, and its downstream products such as permethrin, DV chrysanthemum acid chloride (dipermethrin), etc., isoamyl Enol is also the raw material and intermediate for the production of citral, menthol and vitamin E. With the continuous research and maturity of prenol synthesis process and the deepening of application development, its application range in pesticides will continue to expand, and the market demand will also increase si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/38C07C33/025C07C47/045
CPCC07C29/38C07C33/025C07C45/513C07C47/04
Inventor 王济群刘世杰
Owner TIAN JIN AN DE SHENG SCI -TECH SERVICE CO LTD
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