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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, The effect of simple operation process

Inactive Publication Date: 2007-08-22
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 w...

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 present invention belongs to the field of low temperature plasma technology and chemical synthesis technology, and is especially apparatus for direct oxidization of propane with molecular oxygen to prepare propane epoxide and with coaxial bilayer glass medium discharge electrode structure. In the annular gap bilayer glass medium constitutes, propane molecule and plasma produce high energy electronic function generating isopropyl free radical and n-propyl free radical, and isopropyl free radical and the active oxygen matter oxygen molecule forms in plasma react mutually to oxidize selectively to produce propane epoxide. The present invention has the advantages of no catalytic condition, cheap clean material, simple operation process, no apparatus corrosion and no environmental pollution.

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 Applications(China)
IPC IPC(8): C07D301/22C07D303/04
Inventor 郭明星尹淑慧
Owner DALIAN MARITIME UNIVERSITY
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