Method for preparing aldehyde and apparatus for preparing aldehyde

A method for separating an aldehyde, the method comprising:

• introducing a composition comprising low-boiling point components comprising an aldehyde and high-boiling point components comprising a catalyst solution for a hydroformylation reaction to a vaporizer comprising a vaporizer catch pot;
• separating the low-boiling point components comprising the aldehyde from an upper part of the vaporizer catch pot;
• separating the high-boiling point components comprising the catalyst solution from a lower part of the vaporizer catch pot;
• and
• recirculating at least a portion of the low-boiling point components separated from the upper part of the vaporizer catch pot back to the vaporizer catch pot,
• wherein a weight of the low-boiling point components recirculated to the vaporizer catch pot is from 0.1 times to 10 times a weight of the high-boiling point components separated from the lower part of the vaporizer catch pot.

An apparatus for preparing an aldehyde, the apparatus comprising:

• a hydroformylation reactor comprising a reactant supply pipe and a reaction product moving pipe;
• a vaporizer connected to the reaction product moving pipe and comprising a vaporizer catch pot;
• a low-boiling point component pipe provided at an upper part of the vaporizer catch pot;
• a high-boiling point component pipe provided at a lower part of the vaporizer catch pot;
• and
• a low-boiling point recirculation pipe connecting the low-boiling point component pipe and the vaporizer catch pot.