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A method for oxidizing olefins

A technology for oxidizing olefins and olefins, applied in the direction of organic chemistry, etc., can solve the problems of difficult regeneration of catalysts, affect the overall life of catalysts, and reduce the utilization rate of raw materials, so as to save separation costs, increase yields, and reduce selectivity. Effect

Active Publication Date: 2018-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When titanium-silicon molecular sieves are used as catalysts to oxidize olefins such as propylene, the common problem is that in addition to the target product propylene oxide and propylene oxide hydrolysis and etherification products, the product also contains methyl formate and other substances, which reduces the utilization of raw materials Rate
However, this method is not conducive to the repeated regeneration of the catalyst, that is, it affects the total life of the catalyst, because the rate of catalyst deactivation is accelerated after the reaction temperature is increased, and the catalyst deactivated after the elevated temperature is not easy to be regenerated in the device. , and the activity is not easy to recover completely after regeneration

Method used

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  • A method for oxidizing olefins
  • A method for oxidizing olefins
  • A method for oxidizing olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The reaction is carried out in the reaction zone with different internal diameter ratios of the upper and lower sections in the rectification tower, wherein the ratio of the inner diameter of the lower section to the upper section is 2:1, and the inner diameter of the first catalyst bed in the lower section of the rectification column is the same as that of the upper section. The ratio of the inner diameter of the second catalyst bed is 2:1, and the first catalyst bed is filled with a hollow titanium-silicon molecular sieve (a spherical catalyst with a volume average particle diameter of 500 μm, and the density of the catalyst is 0.70 g / cm 3 ), the second catalyst bed is filled with titanium-silicon molecular sieve TS-1 (a spherical catalyst with a volume average particle diameter of 500 μm and a density of 0.76 g / cm 3 ), the weight ratio of hollow titanium-silicon molecular sieve to titanium-silicon molecular sieve TS-1 is 2:1.

[0078] Propylene, hydrogen peroxide (pr...

Embodiment 2

[0083] The same method as in Example 1 was used to oxidize olefins, except that the shaped titanium-silicon molecular sieve TS-1 in the second catalyst bed was replaced by an equivalent amount of shaped hollow titanium-silicon molecular sieve.

[0084] The results are listed in Table 1 for reaction times of 2 hours, 360 hours and 720 hours.

Embodiment 3

[0086] The same method as in Example 1 was used to oxidize olefins, except that the shaped hollow titanium-silicon molecular sieve in the first catalyst bed was replaced by an equivalent amount of shaped titanium-silicon molecular sieve TS-1.

[0087] The results are listed in Table 1 for reaction times of 2 hours, 360 hours and 720 hours.

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Abstract

The invention provides a method for oxidizing olefins, the method comprising: under oxidation reaction conditions, making a liquid phase mixture containing olefins, an oxidizing agent and optionally an organic solvent flow through a catalyst bed in a rectification column, wherein, The catalyst bed layer contains titanium silicon molecular sieve. By adopting the method of the present invention to oxidize olefins, relatively stable oxidant conversion rate and high selectivity of target oxidation products can be obtained during long-term continuous operation. In particular, by adopting the method of the present invention, the selectivity of epoxides is high, and the selectivity of by-products is low, thereby reducing the difficulty of subsequent separation and purification.

Description

technical field [0001] The present invention relates to a process for the oxidation of alkenes. Background technique [0002] Alkylene oxide is an important class of oxygen-containing organic compounds, such as propylene oxide (PO for short), also known as propylene oxide, is an important basic organic chemical raw material, and its output in propylene derivatives is second only to that of 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 and other materials, the demand for propylene oxide is increasing year by year. However, the current industrial production of propylene oxide still has drawbacks, especially the inability to meet the requirements of green chemist...

Claims

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Application Information

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