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A kind of method of olefin epoxidation

A technology for epoxidation and olefins, applied in the direction of organic chemistry, can solve the problems of increasing catalyst consumption, accelerating catalyst deactivation, unfavorable safety production, etc., to facilitate industrial production and application, improve effective utilization rate, and delay catalyst deactivation Effect

Active Publication Date: 2017-09-29
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, which increases the consumption of the catalyst and thus increases the production cost.

Method used

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  • A kind of method of olefin epoxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example illustrates the epoxidation of propylene using the method of the present invention.

[0038] Propylene epoxidation conditions are the same as in Comparative Example 1, the difference is that after 240 hours of reaction, with 0.02~1.0h -1 The magnitude of / d improves the feed space velocity of the solvent, so that when the conversion rate of the oxidant rises and reaches 94% and the selectivity of the target product oxyalkylene rises and reaches 94%, the feed space velocity of the solvent is maintained until the solvent is increased. Feed space velocity reaches 10h -1 . 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 91%; the selectivity of propylene oxide was 95%. The results of the reaction for 720 hours are as follows: the conversion rate of hydrogen peroxide is 93%; the effective utilization rate of hydrogen peroxide is 89%; the selectiv...

Embodiment 2

[0040] This example illustrates the epoxidation of propylene using the method of the present invention.

[0041] Propylene epoxidation condition is the same as embodiment 1, when increasing the feed space velocity of solvent, make when the conversion rate of oxidant rises, touches 95% or the selectivity of target product oxidized olefin rises, touches 95%, keep the feed of solvent airspeed. The results of the reaction for 360 hours were as follows: the conversion rate of hydrogen peroxide was 97%; the effective utilization rate of hydrogen peroxide was 93%; the selectivity of propylene oxide was 97%. The result of reacting for 720 hours is 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%.

Embodiment 3

[0043] This example illustrates the epoxidation of propylene using the method of the present invention.

[0044] Propylene epoxidation condition is the same as embodiment 2, and difference is after reacting for 240 hours, 0.02~1.0h -1 The magnitude of / d improves the feed space velocity of solvent, so that when the conversion rate of oxidant rises, touches 95% and the selectivity of target product oxidized olefin rises, touches 95%, keeps the feed space velocity of solvent, when reaction process When the conversion rate of the oxidizing agent decreases again and reaches 90% and / or the selectivity of the target product oxidized olefins decreases again and reaches 92%, the mass concentration of the oxidizing agent in the raw material is increased in the range of 0.02 to 5% / day, so that when the conversion of the oxidizing agent When the rate rises again and reaches 95% and / or the selectivity of the target product oxidized olefins rises again and reaches 95%, the mass concentrati...

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Abstract

An olefin epoxidation method is characterized in that olefin and an oxidant contact and react with a catalyst on a fixed bed under olefin oxidation reaction conditions, and the feeding air speed of a solvent is improved according to a rate of 0.01-2.0h<-1> / d when an index (a) the conversion rate of the oxidant in reaction process reduces to 90% and / or an index (b) the selectivity of a target product olefin oxide reduces to 92% in order to maintain the feeding air speed of the solvent when an index (c) the conversion rate of the oxidant rises to 94% and / or an index (d) the selectivity of the target product olefin oxide rises to 94%. The method maintains the conversion rate of the oxidant and the selectivity of olefin oxide in a high range in the reaction contact process, and delays the inactivation of the catalyst in order to prolong the entire life of the catalyst and prolong the total operation time.

Description

technical field [0001] The invention relates to a method for epoxidation of olefins. Background technique [0002] Oxygenated olefins are an important class of oxygen-containing organic compounds, such as propylene oxide (PO), also known as propylene oxide, is an important basic organic chemical raw material, and its output in propylene derivatives is second only to polypropylene oxide. 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,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/12C07D301/19
CPCC07D301/12C07D301/19C07D303/04
Inventor 史春风林民朱斌
Owner CHINA PETROLEUM & CHEM CORP
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