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A method for oxidizing olefins

A technology for oxidizing olefins and olefins, applied in chemical recovery, organic chemistry, etc., can solve the problems of reduced catalytic performance of catalysts, deactivation of catalysts, inability to obtain the selectivity of target oxidation products, etc. Effect

Active Publication Date: 2018-05-18
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, the common problem is that after the device has been in operation for a period of time, the catalytic performance of the catalyst will decrease, that is, the catalyst will be deactivated during operation, resulting in the selection of the target oxidation product in the obtained reaction mixture. sex decline
[0007] However, when the regenerated catalyst is put into operation again, especially after in-vehicle regeneration, the activity of the catalyst fluctuates greatly and it takes a long time to stabilize, resulting in the inability to obtain stable target oxidation product selectivity

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0099] Catalyst (that is, shaped titanium-silicon molecular sieve TS-1 is a spherical catalyst with a volume average particle diameter of 1000 μm, the content of titanium-silicon molecular sieve TS-1 in the catalyst is 75% by weight, the content of silicon oxide is 25% by weight, and the density is 0.79g / cm 3 ) is packed in a fixed-bed reactor to form a catalyst bed, wherein the number of the catalyst bed is 1 layer.

[0100] Propylene, hydrogen peroxide (provided as 30% by weight hydrogen peroxide) as oxidant and acetone as solvent were mixed to form a liquid mixture which was fed from the bottom of the fixed bed reactor and flowed through the catalyst bed. Among them, the molar ratio of propylene to hydrogen peroxide is 2:1, the molar ratio of propylene to acetone is 1:10, and the weight hourly space velocity of propylene is 3h -1 . The catalyst bed was heated to a temperature of 40° C. by means of heating wires arranged in the catalyst bed. During the reaction, the heatin...

Embodiment 2

[0106] Adopt the same method as Example 1 to oxidize propylene, the difference is that the initial molar ratio of propylene to hydrogen peroxide is 2:1, during the reaction, when condition 1 is met for the first time, the Decrease the amount of heat exchange medium until condition 2 is met, stop reducing the amount of heat exchange medium and keep the amount of heat exchange medium; when condition 1 is met for the second time, increase the amount of liquid mixture by 0.02-2% / day The quality of hydrogen peroxide (realize by increasing the concentration of hydrogen peroxide in hydrogen peroxide, correspondingly reduce the consumption of hydrogen peroxide, so that the mol ratio of propylene and hydrogen peroxide remains constant) until condition 2 is satisfied, and so on (that is, in When condition 1 is met for the odd number of times, reduce the amount of heat exchange medium at the rate of 0.01-2% / day until condition 2 is met; The quality of hydrogen peroxide until condition 2)...

Embodiment 3

[0109]Adopt the method identical with embodiment 2 to oxidize propylene, difference is, also send into the ammoniacal liquor (concentration is 25% by weight) in the fixed-bed reactor, so that the pH value of the liquid mixture formed by propylene, hydrogen peroxide and acetone is adjusted to 8 . When the reaction lasted for 820 hours, the amount of the heat exchange medium was 75% of the initial amount, and the concentration of hydrogen peroxide in the hydrogen peroxide was 49% by weight. The results of the 0.5 hour and 820 hour reactions are listed in Table 1.

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Abstract

The invention discloses a method for oxidizing alkenes, which comprises contacting and reacting a liquid mixture with a titanium-silicon molecular sieve under oxidation reaction conditions, and removing the heat of reaction with a heat exchange medium during the contact reaction process, the liquid mixture containing Olefin, at least one oxidant, and optionally at least one solvent, wherein, when the target oxidation product drops below a desired value, the method further includes adjusting the conditions of the heat exchange to reduce the amount of heat of reaction removed and may Optionally increase the quality of the oxidant in the liquid mixture to increase the selectivity of the target oxidation product until the expected value is met. The method can maintain the selectivity of the target oxidation product at a high level during long-term continuous operation, effectively prolongs the single-pass service life of the titanium-silicon molecular sieve as a catalyst, and reduces the regeneration frequency of the catalyst.

Description

technical field [0001] The present invention relates to a process for the oxidation of alkenes. Background technique [0002] Epoxides are an important class of oxygen-containing organic compounds. For example, propylene oxide is an important basic organic chemical raw material, and its yield is second only to polypropylene among propylene derivatives. The largest use of propylene oxide 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 need to develop econom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/12C07D301/19
CPCY02P20/582Y02P20/584
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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