Device for preparing propionic aldehyde by directly oxidizing propylene with molecular oxygen

A molecular oxygen, direct technology, used in the preparation of carbon-based compounds, the preparation of organic compounds, organic chemistry, etc., can solve the problems of difficult separation and recovery of catalysts and reaction products, high industrial production costs, and achieve good industrial application prospects. Equipment corrosion and environmental pollution problems, the effect of simple operation process

Inactive Publication Date: 2007-01-24
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

In the mid-1970s, UCCUnion Carbon Corp., DPDavy Power, and JMJohnson Matthey jointly developed the HRh(CO)[P(Ph) 3 ] 3 In 1975, UCC adopted the low-pressure oxo synthesis method as a catalyst to realize industrial production in Texas, USA. This method has the advantages of uniform concentration distribution, good reactivity, high selectivity, and good heat transfer effect, but its biggest The disadvantage is that it is difficult to separate and recover the catalyst and the reaction product, and the industrial production cost is high
Overall, the hydroformylation activity of heterogeneous catalysis is still lower than that of homogeneous catalysis

Method used

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  • Device for preparing propionic aldehyde by directly oxidizing propylene with molecular oxygen

Examples

Experimental program
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Effect test

Embodiment 1

[0016]Propylene industrial polymerization grade, purity ≥ 99.99% and oxygen ordinary steel cylinder gas, purity ≥ 99% are regulated by a gas mass flow meter, and mixed uniformly in the mixer at a flow rate of 1 ml / min and 65.7 ml / min respectively. Propylene accounts for 1.5% , and then enter the reactor from the raw material gas inlet 3, and after replacing the air for 3 minutes, switch on the AC high-voltage power supply to perform dielectric barrier plasma discharge. The reaction is carried out at the product gas outlet 10 for detection and analysis of the product. The housing of the device of the present invention is made of oxide hard glass, wherein the outer diameter of the inner cylinder is 4.5 millimeters, the wall thickness of the inner cylinder is 1.5 millimeters, the distance between the inner cylinder and the middle cylinder is 10 millimeters, and the discharge area The length is 100mm. The device of the invention uses a stainless steel tube with a smooth surface a...

Embodiment 2

[0018] Repeat Example 1, change the volume ratio of propylene / oxygen in the feeder, the reaction result obtained is: when the volume ratio of propylene / oxygen is 0.5%, the conversion of propylene is 81.6%, and the selectivity of propionaldehyde is 9.9%; When the volume ratio of propylene / oxygen was 1.0%, the conversion of propylene was 42.5%, and the selectivity of propionaldehyde was 24.2%; when the volume ratio of propylene / oxygen was 2.0%, the conversion of propylene was 18.1%, and the selectivity of propionaldehyde The selectivity was 30.9%.

Embodiment 3

[0020] Repeat Example 1, when the volume ratio of propylene / oxygen was 0.5%, the reaction result obtained under different discharge voltages was: when the discharge voltage was 15.8kV, the conversion of propylene was 0.6%, and the selectivity of propionaldehyde was 17.6%; when the discharge voltage was 18.5kV, the conversion of propylene was 19.0%, and the selectivity of propionaldehyde was 22.3%; when the discharge voltage was 20.0kV, the conversion of propylene was 57.8%, and the selectivity of propionaldehyde was 17.8% .

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Abstract

The present invention belongs to the field of low temperature plasma chemistry and basic chemical synthesizing technology, and is especially apparatus for preparing propionic aldehyde through direct oxidation of propylene with molecular oxygen. The apparatus has double medium discharge electrode structure to generate pure medium blocking discharge plasma. The propylene molecule is acted with the high energy electron formed in the plasma to form free radical with three connected carbon atoms, while the oxygen molecule is acted with the high energy electron formed in the plasma to form excited state oxygen molecule, oxygen atom, negative oxygen ion, positive oxygen ion and other active oxygen matters. These active oxygen matters and the free radical with three connected carbon atoms react to synthesize propionic aldehyde directly. The present invention has mild reaction condition, high reaction efficiency, high target product yield and environment friendship.

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 propionaldehyde by direct oxidation of propylene and molecular oxygen. Background technique [0002] Propionaldehyde is an important raw material for organic synthesis, mainly used in the production of chemical intermediates such as propionic acid, propanol, trimethylolethane and acetone oxime. [0003] At present, the 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. In the mid-1970s, UCCUnion Carbon Corp., DPDavy Power, and JMJohnson Matthey jointly developed the HRh(CO)[P(Ph) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/35C07C47/02
Inventor 郭明星尹淑慧
Owner DALIAN MARITIME UNIVERSITY
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