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Apparatus for direct oxidization of propane with molecular oxygen to prepare propane epoxide

A technology of propylene oxide and molecular oxygen, which is applied in the field of devices for the direct oxidation of propane and molecular oxygen to prepare propylene oxide, can solve the problems of sensitive process conditions and difficulty in repeating experimental results, and achieve cheap and clean raw materials, good industrial application prospects, No equipment corrosion effect

Inactive Publication Date: 2009-08-26
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the system is very sensitive to process conditions, and the experimental results are difficult to repeat

Method used

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  • Apparatus for direct oxidization of propane with molecular oxygen to prepare propane epoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Propane with a purity of ≥99.99% and oxygen gas in an ordinary steel cylinder with a purity of ≥99% are regulated by a gas mass flowmeter and mixed uniformly in a mixer, in which propylene accounts for 1.0%, and then enter the reactor from the feed gas inlet 4 to replace the air After 5 minutes, switch on the AC high-voltage power supply to conduct dielectric barrier plasma discharge. The raw material gas reacts in the annulus formed between the inner cylinder 7 and the outer cylinder 2, and the product is detected and analyzed at the product gas outlet 6. The housing of the device of the present invention is made of oxide hard glass, wherein the outer diameter of the inner cylinder 7 is 3.5 millimeters, the wall thickness of the inner cylinder 7 is 1.5 millimeters, and the distance between the annular gap between the inner cylinder 7 and the outer cylinder 2 is 5 mm. mm, the length of the discharge area is 150 mm. The device of the present invention uses a copper wire ...

Embodiment 2

[0023] Repeat Example 1, when the volume ratio of propane / oxygen was 1.5%, the reaction result obtained under different discharge voltages was: when the discharge voltage was 15.6kV, the conversion of propane was 8.4%, and the selectivity of propylene oxide It was 6.6%; when the discharge voltage was 18.3kV, the propane conversion rate was 24.9%, and the selectivity of propylene oxide was 8.9%; when the discharge voltage was 20.5kV, the propane conversion rate was 30.1%, and the selectivity of propylene oxide was 7.2%.

Embodiment 3

[0025] Repeat Example 1, change the volume ratio of propane / oxygen in the raw material gas, the reaction result that obtains is: when the volume ratio of propane / oxygen is 0.5%, the conversion of propane is 39.2%, and the selectivity of propylene oxide is 5.1% ; When the volume ratio of propane / oxygen was 1.5%, the propane conversion rate was 25.8%, and the selectivity of propylene oxide was 7.6%; when the volume ratio of propane / oxygen was 2.0%, the propane conversion rate was 19.6%, and the The selectivity to oxypropane was 9.4%.

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Abstract

The invention belongs to the technical field of low-temperature plasma chemistry and basic organic chemical synthesis, and is a device for directly oxidizing propane and molecular oxygen to prepare propylene oxide, which adopts a coaxial two-layer glass dielectric discharge electrode structure. In the annular space formed by the double-layer glass medium, propane molecules interact with high-energy electrons formed in the plasma to generate isopropyl radicals and n-propyl radicals. At the same time, isopropyl radicals and oxygen molecules are in the plasma Some of the reactive oxygen species formed interact to undergo selective oxidation reactions and generate propylene oxide. The advantages of the present invention are that under non-catalytic conditions, only molecular oxygen is used to directly generate high-energy electrons capable of initiating free radical reactions in the plasma reactor and active oxygen species available for epoxidation, the raw materials are cheap and clean, the operation process is simple, and there is no The problem of equipment corrosion and environmental pollution belongs to the green synthesis route of low-cost one-step preparation of propylene oxide.

Description

technical field [0001] The invention belongs to the technical field of low-temperature plasma chemistry and synthesis of basic organic chemicals, in particular to a device for preparing propylene oxide by direct oxidation of propane and molecular oxygen. Background technique [0002] Propylene oxide (PO) is an important petrochemical basic raw material. The chlorohydrin method and the co-oxidation method are the main methods for industrial production of propylene oxide at present. Since the production process is accompanied by a large amount of waste discharge and a large number of co-products, these two technologies have serious shortcomings. [0003] Over the past two decades, researchers at home and abroad have been committed to the production of C from propylene raw materials with simple process, few by-products and no pollution. 3 Research on green catalytic processes for oxidation products, especially propylene oxide. Among them, molecular oxygen (O 2 Or Air) the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/22C07D303/04
Inventor 郭明星尹淑慧
Owner DALIAN MARITIME UNIVERSITY
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