A fixed bed propanal synthesis reactor, comprising a reaction cylinder body (1), a spherical sealing head (2) is fixedly provided at the top of the reaction cylinder body (1), two heat exchanging tube plates (3) are fixedly provided within the cylinder body (1), a plurality of thermal energy absorption assemblies (4) for absorbing heat from a propanal synthesis reaction are fixedly installed within the heat exchanging tube plates (3), and an isopentane feed distribution apparatus (5) is connected to the tops of the plurality of thermal energy absorption assemblies (4) and is used for liquid phase isopentane feeding during the propanal synthesis reaction.
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