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Device for directly preparing propionaldehyde from propane and oxygen under alternating electric field

An alternating electric field and propane technology is applied in the preparation of carbon-based compounds, the preparation of organic compounds, chemical instruments and methods, etc., to achieve mild reaction conditions, no equipment corrosion, and good industrial application prospects.

Inactive Publication Date: 2007-09-12
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overall, the hydroformylation activity of heterogeneous catalysis is still lower than that of homogeneous catalysis

Method used

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  • Device for directly preparing propionaldehyde from propane and oxygen under alternating electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Propane, purity ≥ 99.99% and oxygen ordinary cylinder gas, purity ≥ 99% are regulated by the gas mass flow meter, and mixed uniformly in the mixer at an appropriate flow rate respectively. The volume ratio of propane and oxygen is 1.2%, and then from the raw material gas The inlet 2 enters the reactor, and after the air is replaced for 5 minutes, the AC high-voltage power supply is connected to conduct dielectric barrier plasma discharge, and the product detection and analysis are carried out at the product gas outlet 7. The reactor barrel 6 of the device of the present invention is made of oxide hard glass, its outer diameter is 15 mm, the wall thickness is 1.5 mm, and the length of the discharge zone is 160 mm. The device of the present invention uses a copper wire with a smooth surface as the discharge electrode, the outer diameter of which is 1.2 mm, and the ground electrode is a copper mesh. Under the conditions of a voltage of 21.0kV and a frequency of 1.0kHz, the...

Embodiment 2

[0019] Repeat Example 1, change the volume ratio of propane / oxygen in the feed gas, and the reaction result obtained is: when the volume ratio of propane / oxygen is 0.5%, the conversion of propane is 35.1%, and the selectivity of propionaldehyde is 4.3%; When the volume ratio of propane / oxygen was 1.0%, the conversion of propane was 30.5%, and the selectivity of propionaldehyde was 5.0%; when the volume ratio of propane / oxygen was 1.5%, the conversion of propane was 19.8%, and the selectivity of propionaldehyde was 19.8%. The selectivity was 5.9%.

Embodiment 3

[0021] Example 1 was repeated, when the volume ratio of propane / oxygen was 0.5%, the reaction result obtained under different discharge voltages was: when the discharge voltage was 15.0kV, the conversion of propane was 3.3%, and the selectivity of propionaldehyde was 2.1%; when the discharge voltage is 17.6kV, the propane conversion rate is 20.4%, and the selectivity of propionaldehyde is 3.5%; when the discharge voltage is 19.3kV, the propane conversion rate is 27.9%, and the selectivity of propionaldehyde is 4.0% .

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Abstract

This invention relates to a device for preparing propaldehyde directly by propane and oxygen acted under alternated field composed of a reactor drum, a raw gas inlet and a produced gas outlet, in which, the reactor drum is made of oxide glass to generate medium blocking discharged plasma by a line-drum electrode structure, oxygen molecules and propane molecules act with hard electrons formed in plasma to generate active oxygen species and isopropyl free radical, which reacts with the active species to eliminate beta bit of C-H key to get propylene, which reacts with the active species for selective oxidation reaction to generate propanal.

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 directly preparing propionaldehyde from propane and oxygen under the action of an alternating electric field. Background technique [0002] As an important organic chemical raw material, propionaldehyde is mainly used to produce chemical intermediates such as propionic acid, propanol, trimethylolethane and acetone oxime. [0003] The existing industrial production methods of propionaldehyde mainly include oxo synthesis method, propanol oxidation method, propylene oxide isomerization method, acrolein hydrogenation method and by-product method. Among them, the oxo synthesis method, that is, the ethylene hydroformylation method, is currently the main method for the industrial production of propionaldehyde. This method has the advantages of uniform concentration distribution, good reactivity, high selecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/02C07C45/33
Inventor 尹淑慧郭明星
Owner DALIAN MARITIME UNIVERSITY
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