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

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) ...

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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

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