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Device for preparing propylene by dehydrogenating propane under hydrogen plasma

A plasma and propane dehydrogenation technology, applied in the directions of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., to achieve the effects of cheap and clean raw materials, mild reaction conditions and simple operation process

Inactive Publication Date: 2009-02-11
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current reaction conditions of propane oxidative dehydrogenation, it is easy to completely oxidize the reactant propane and the product propylene to generate CO and CO 2

Method used

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  • Device for preparing propylene by dehydrogenating propane under hydrogen plasma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Propane gas, purity ≥ 99.99% and hydrogen common cylinder gas, purity ≥ 99% are regulated by a gas mass flow meter, and mixed uniformly in the mixer at a flow rate of 10 ml / min and 10 ml / min respectively, propane accounts for 50%, Then enter the reactor from the raw material gas inlet 5, replace the air for 2 minutes, switch on the AC high-voltage power supply, and carry out dielectric barrier discharge, the raw material gas reacts in the ring gap formed between the inner cylinder glass 3 and the middle cylinder glass 9, and Product gas outlet 8 is used for product detection and analysis. The shell of the device of the present invention is made of oxide hard glass, wherein the outer diameter of the inner cylinder is 6.0 millimeters, the wall thickness of the inner cylinder is 1.5 millimeters, the distance between the ring gap between the inner cylinder and the middle cylinder is 3 millimeters, and the discharge area The length is 150mm. In the device of the present inv...

Embodiment 2

[0019] Repeat Example 1, pass into the aqueous solution containing sodium carbonate 1% (mass ratio) as liquid electrode 10, the reaction result that obtains is: propane conversion ratio is 36.5%, and the selectivity of propylene is 14.8%; Water electrode 1 and liquid electrode When 10 all adopt the aqueous solution containing sodium carbonate 1% (mass ratio), the conversion rate of propane is 43.2%, and the selectivity of propylene is 15.1%.

Embodiment 3

[0021] Example 1 was repeated, when the volume ratio of propane / hydrogen was 60%, the reaction results obtained under different discharge voltages were: when the discharge voltage was 16.6kV, the conversion of propane was 2.4%, and the selectivity of propylene was 6.8 %; when the discharge voltage was 19.2kV, the conversion of propane was 22.0%, and the selectivity of propylene was 9.3%; when the discharge voltage was 25.3kV, the conversion of propane was 35.1%, and the selectivity of propylene was 13.5%.

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Abstract

This invention relates to a device for preparing propylene by taking off hydrogen from propane under a condition of hydrogen plasma, a structure of coaxial three-layer sleeve of which is made in oxide glass including an inner sleeve, a mid and an outer sleeve, in which, a plasma activation reactor with a dual medium discharge electrode first of all plasmizes the propane and hydrogen, which act with hard electrons formed in the plasma to generate isopropyl free radical and H free radical, and the isopropyl free radical eliminates beta-bit of C-H key acted by H free radical to get propylene.

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 by dehydrogenating propane under hydrogen plasma conditions. Background technique [0002] Propylene is an important colorless flammable hydrocarbon, mainly used in the production of chemical products such as polypropylene, cumene, hydroxy alcohol, acrylonitrile, and propylene oxide. At present, propylene mainly comes from the by-products of steam cracking to produce ethylene, and the by-products of catalytic cracking (FCC) in refineries to produce gasoline and diesel. Facing the ever-increasing demand for propylene in the petrochemical industry, it is difficult to meet the above-mentioned processes alone, and it is urgent to find a new production process for propylene. Therefore, the preparation of propylene with abundant and economical propane as raw material has quickly become a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/327C07C11/06
Inventor 郭明星尹淑慧
Owner DALIAN MARITIME UNIVERSITY
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