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A kind of method of olefin oxidation

A technology of olefins and oxidants, which is applied in the direction of organic chemistry, can solve the problems of reducing the selectivity of target products, accelerating catalyst deactivation, unfavorable safety production, etc., and achieves the benefits of industrial production and application, delaying catalyst deactivation, and improving catalyst life. Effect

Active Publication Date: 2017-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this kind of regeneration is that when re-running after regeneration, especially when re-running after in-device regeneration, the activity and selectivity of the catalyst fluctuate greatly, and it takes a long time to stabilize. The smooth operation of the reaction, but this will further accelerate the deactivation of the catalyst and reduce the selectivity of the target product, which will affect the refining and separation of subsequent products, and is not conducive to safe production
However, this method is not conducive to the repeated regeneration of the catalyst, that is, it affects the total life of the catalyst.

Method used

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  • A kind of method of olefin oxidation
  • A kind of method of olefin oxidation
  • A kind of method of olefin oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0035] This example illustrates the epoxidation of propylene using the method of the present invention.

[0036] Propylene epoxidation conditions are the same as in Comparative Example 1, the difference is that after 240 hours of reaction, with 0.02~0.2h -1 The magnitude of / d reduces the space velocity of the system oxidant, so that when the conversion rate of the oxidant rises and reaches 94% and the selectivity of the target product oxidized olefins rises and reaches 94%, the space velocity of the system oxidant is maintained until the space of the system oxidant Speed ​​down to 0.02h -1 . The results of the reaction for 360 hours were as follows: the conversion rate of hydrogen peroxide was 95%; the effective utilization rate of hydrogen peroxide was 88%; the selectivity of propylene oxide was 94%. The results of the reaction for 720 hours were as follows: the conversion rate of hydrogen peroxide was 92%; the effective utilization rate of hydrogen peroxide was 87%; the s...

Embodiment 2

[0038] This example illustrates the epoxidation of propylene using the method of the present invention.

[0039] Propylene epoxidation condition is the same as embodiment 1, when reducing the space velocity of system oxidant, make when the conversion ratio of oxidant rises, touches 95% or the selectivity of target product oxidized olefin rises, touches 95%, keep the space velocity of system oxidant . The results of the reaction for 360 hours were as follows: the conversion rate of hydrogen peroxide was 96%; the effective utilization rate of hydrogen peroxide was 90%; the selectivity of propylene oxide was 95%. The results of the reaction for 720 hours were as follows: the conversion rate of hydrogen peroxide was 93%; the effective utilization rate of hydrogen peroxide was 88%; the selectivity of propylene oxide was 95%.

Embodiment 3

[0044] This example illustrates the epoxidation of propylene using the method of the present invention.

[0045] Propylene epoxidation conditions are the same as in Comparative Example 2, the difference is that after 240 hours of reaction, 0.02~1.0h -1 The magnitude of / d reduces the space velocity of the oxidant in the system, so that when the conversion rate of the oxidant rises and reaches 95% and the selectivity of the target product oxidized olefins rises and reaches 95%, the space velocity of the oxidant in the system is kept until the system oxidant is empty. The speed reaches 0.02h -1 . The results of the reaction for 360 hours are as follows: the conversion rate of hydrogen peroxide is 95%; the effective utilization rate of hydrogen peroxide is 90%; the selectivity of propylene oxide is 95%. The results of the reaction for 720 hours were as follows: the conversion rate of hydrogen peroxide was 95%; the effective utilization rate of hydrogen peroxide was 88%; the sel...

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Abstract

The invention relates to an alkene oxidation method. Specifically, under alkene oxidation reaction conditions, alkene and an oxidizing agent undergo contact reaction with a catalyst on a fixed bed. The method is characterized by comprising the steps that whenever index (a) the conversion rate of the oxidizing agent drops and reaches 90% in the reaction process, and / or index (b) the selectivity of the target product oxidized alkene drops and reaches 92%, the space velocity of the oxidizing agent is reduced at an amplitude of 0.001-0.15h<-1> / d, so that when index (c) the conversion rate of the oxidizing agent rises and reaches 94%, and / or index (d) the selectivity of the target product oxidized alkene rises and reaches 94%, the space velocity of the oxidizing agent is maintained. The method can keep the total conversion rate of the oxidizing agent and the target product selectivity in the reaction contact process, lengthens the total running time, simultaneously delays deactivation of the catalyst, and prolongs the service life of the catalyst.

Description

technical field [0001] The present invention relates to a method for oxidizing olefins. Background technique [0002] Alkylene oxide is an important class of oxygen-containing organic compounds, such as propylene oxide, also known as propylene oxide (PO for short), is an important basic organic chemical raw material, and its output in propylene derivatives is second only to poly propylene. The biggest use of PO is to produce polyether polyols for further processing to make polyurethane, and it can also be used to produce propylene glycol which is widely used. In addition, propylene oxide can also be used in the production of surfactants, oilfield demulsifiers, etc. [0003] With the wide application of polyurethane materials, etc., the demand for propylene oxide is increasing year by year. At present, there are disadvantages in the process of producing propylene oxide in industry, especially it does not meet the requirements of green chemical industry. Therefore, there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D303/04
CPCC07D301/12C07D303/04
Inventor 朱斌史春风林民舒兴田
Owner CHINA PETROLEUM & CHEM CORP