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Method for oxidation of olefin

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

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Examples

Experimental program
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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 oxidation of olefin. The method comprises the step of subjecting a liquid mixture which contains olefin and an oxidant and optionally contains an organic solvent to passing through a catalyst bed in a rectifying tower under the condition of oxidation reaction, wherein the catalyst bed is provided with a titanium-silicate molecular sieve. The method for oxidation of olefin provided by the invention can obtain stable conversion rate of the oxidant and high selectivity of a target oxidation product in the process of long-time continuous operation. Specifically, the method provided by the invention has high selectivity of epoxides and low selectivity of by-products, so subsequent separation and purification difficulty is reduced.

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), also known as propylene oxide, is an important basic organic chemical raw material, and its output in propylene derivatives is second only to polypropylene . 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 chemistry. Therefore, there is an urgent...

Claims

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Application Information

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