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Preparation method of epoxy compound

A technology of epoxy compounds and compounds, applied in the direction of organic chemistry, etc., can solve the problems of oxidant and product decomposition, reduced selectivity of epoxidized products, large reaction heat, etc., achieve high conversion rate, improve process safety, and improve selectivity sexual effect

Active Publication Date: 2021-01-22
北京水木滨华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a feeding method requires extremely strict requirements, including the control of the amount added at each feeding point and the total amount added. If the control is not good, it will easily cause excessive heat of reaction, leading to problems such as decomposition of oxidants and products.
At the same time, because the reaction temperature is too high, although the reaction rate of the oxidizing agent is improved to a certain extent, the selectivity of the epoxidation product is obviously reduced.

Method used

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  • Preparation method of epoxy compound
  • Preparation method of epoxy compound
  • Preparation method of epoxy compound

Examples

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preparation example Construction

[0055] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0056] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0057] The schematic diagram of the epoxidation reaction device used in the following examples and comparative examples is as follows figure 2 As shown, each reactor represents a 1st order reaction. According to the flow direction of the reaction...

Embodiment 1

[0059] Using tert-butyl alcohol as a solvent, the concentration of oxidant tert-butyl hydroperoxide is 20wt%, the molar ratio of propylene to tert-butyl hydroperoxide is 3:1, and the concentration of molybdenum polyol catalyst is 300ppm.

[0060] Put the above materials in the figure 2 Mix well in the epoxidation reaction device shown, carry out the propylene epoxidation reaction at 120-125°C within the reaction residence time of 0-10 minutes, and carry out the propylene epoxidation reaction at 125-130°C and higher than the reaction residence time of 10-20 minutes The propylene epoxidation reaction is carried out at the temperature of the previous stage, and the propylene epoxidation reaction is carried out at a temperature of 130-135° C. and higher than the reaction temperature of the previous stage within the reaction residence time of 20-30 minutes.

[0061] After the 30-minute reaction in the first stage, the product propylene oxide was separated by rectification, and the...

Embodiment 2

[0086] Using tert-butyl alcohol as a solvent, the concentration of oxidant tert-butyl hydroperoxide is 20wt%, the molar ratio of 1-butene to tert-butyl hydroperoxide is 3:1, and the concentration of molybdenum polyol catalyst is 300ppm.

[0087]Mix the above materials evenly in the epoxidation reaction device, carry out the 1-butene epoxidation reaction at 120-125°C within the reaction residence time of 0-10 minutes, and carry out the 1-butene epoxidation reaction at 125-130°C within the reaction residence time of 10-20 minutes The 1-butene epoxidation reaction is carried out at a temperature higher than that of the previous paragraph, and the 1-butene epoxidation reaction is carried out at a temperature of 130-135° C. and higher than that of the previous paragraph within the reaction residence time of 20-30 minutes.

[0088] After the 30-minute reaction in the first stage, the product 1,2-epoxybutane was separated by rectification, and then a part of the by-product tert-butano...

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Abstract

The invention provides a preparation method of an epoxy compound, and develops a step-by-step heating preparation process. When the concentration of an oxidizing agent is high, a low-temperature reaction is selected, so that the decomposition reaction of the oxidizing agent is reduced on the premise of ensuring the reaction rate; and when the concentration of the oxidizing agent is reduced, the reaction rate is increased by increasing the reaction temperature, and the side reaction of epoxy compound decomposition is reduced. The process does not need to add the oxidizing agent in batches, so that the complexity of process operation is simplified. Compared with the preparation method reported in the existing literature, the step-by-step heating method ensures the high conversion rate of theoxidizing agent, enhances the selectivity of the epoxidation reaction, simplifies the production operation and enhances the process safety.

Description

technical field [0001] The invention belongs to the technical field of epoxy compounds, and in particular relates to a preparation method of epoxy compounds. Background technique [0002] Epoxy compounds are an important class of organic chemical intermediates, such as Propylene Oxide (PO), which can chemically react with a variety of substances due to its highly tense oxygen-containing three-membered ring structure, and its derivative products Nearly a hundred kinds. The main use of propylene oxide is to prepare polyether polyol, propylene glycol and various nonionic surfactants, among which polyether polyol is an important raw material for the production of polyurethane foam, insulation materials, elastomers, adhesives and coatings. As an important basic chemical raw material, the market demand for propylene oxide shows a continuous growth trend due to the increasing consumption of downstream products. [0003] The production methods of propylene oxide mainly include chl...

Claims

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Application Information

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IPC IPC(8): C07D301/19C07D303/04
CPCC07D301/19C07D303/04
Inventor 门永彪马敏解淑民纪珲赵伟男杨灿郑虓
Owner 北京水木滨华科技有限公司
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