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Method for preparing ethylbenzene hydroperoxide by liquid-phase peroxidation of ethylbenzene and preparation method of propylene oxide

A technology of ethylbenzene hydroperoxide and liquid-phase peroxidation of ethylbenzene, which is applied in the direction of preparation of peroxygen compounds, preparation of organic compounds, chemical instruments and methods, etc., can solve the loss of EBHP, increase the risk of PMA emulsification, and destabilize sexual issues

Active Publication Date: 2020-04-10
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such procedures usually cause additional EBHP loss, increase the risk of PMA emulsification in the aqueous phase and thus destabilize the operation

Method used

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  • Method for preparing ethylbenzene hydroperoxide by liquid-phase peroxidation of ethylbenzene and preparation method of propylene oxide
  • Method for preparing ethylbenzene hydroperoxide by liquid-phase peroxidation of ethylbenzene and preparation method of propylene oxide
  • Method for preparing ethylbenzene hydroperoxide by liquid-phase peroxidation of ethylbenzene and preparation method of propylene oxide

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0045] Measure 250ml of ethylbenzene into the reaction kettle and seal it. The air in the reactor was replaced by introducing nitrogen several times, and the pressure was increased to about 1 barG, the reactor inlet was closed, and the back pressure valve of the reactor tail gas outlet was adjusted to a tightly closed state. Turn on the reactor's mechanical stirring, electric heating, and tail gas condenser pipe circulating water, turn on the computer temperature control program and set the temperature in the reactor to 150°C, and the stirring speed to 800r / min. When the temperature in the reactor reaches the set value, open the air inlet valve, start the reaction and record the time, and at the same time take a sample to obtain the first sample. Thereafter, samples were taken every 5-20 minutes, solvent and nitrogen purge were required before and after each sampling, and the total reaction time was 3.5 hours. Data during the experiment (temperature in the kettle, air flow, O...

reference example 2

[0048] Measure 250ml of ethylbenzene, add 10ppm (based on the mass of ethylbenzene) sodium hydroxide to make a solution, put the above solution into the reaction kettle and seal it. Other experimental procedures are the same as in Example 1. According to the analysis results, the selectivity of EBHP under different EBHP concentrations can be obtained, and the results are shown in the following table:

[0049]

Embodiment 3

[0051] Measure 250ml of ethylbenzene, add 10ppm (based on the quality of ethylbenzene) of guanidine carbonate and configure it into a solution, add the above solution into the reaction kettle and seal it. Other experimental procedures are the same as in Example 1. According to the analysis results, the selectivity of EBHP under different EBHP concentrations can be obtained, and the results are shown in the following table:

[0052]

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Abstract

The present invention relates to a method for preparing ethylbenzene hydroperoxide by liquid-phase peroxidation of ethylbenzene and a method for preparing propylene oxide. The method promotes the reaction between ethylbenzene and gas containing oxygen molecules by adding a small amount of organic basic substances. peroxidation reaction. The method can effectively improve the selectivity of the target product, and the added organic basic substance will not affect the activity of the subsequent epoxidation catalyst.

Description

technical field [0001] The invention relates to a method for preparing ethylbenzene hydroperoxide by ethylbenzene liquid-phase peroxidation and a method for preparing propylene oxide, in particular to a method for preparing ethylbenzene hydroperoxide by adding basic organic compounds to promote ethylbenzene peroxidation reaction. Oxides and methods for the further preparation of propylene oxide. Background technique [0002] Propylene oxide (PO) and styrene (SM) co-production method (also known as PO / SM method) is considered to be one of the best processes for industrial production of propylene oxide because of its low pollution and low energy consumption. The process route mainly includes 3 steps, namely: [0003] 1. Excessive liquid-phase ethylbenzene contacts with oxygen in the air or a mixed gas containing oxygen to generate ethylbenzene hydroperoxide (EBHP); [0004] 2. Under high pressure, EBHP reacts with excess liquid phase propylene to generate propylene oxide and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C407/00C07C409/08C07D301/19C07D303/04
CPCC07C407/00C07D301/19C07D303/04Y02P20/52C07C409/08
Inventor 刘鹏代洪涛孙钦鹤刘若尘孙犀璨李兴伟郎小俊于天勇
Owner WANHUA CHEM GRP CO LTD
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