Separation system and method for preparing acetaldehyde product from ethanol

The invention discloses a separation system for preparing acetaldehyde products from ethanol, which comprises a reactor and an ethanol absorption tower, the reactor is connected with the bottom side wall of the ethanol absorption tower, and the tower top of the ethanol absorption tower is sequentially connected with a compressor, a first cooler and a first gas-liquid separation tank; a tower bottom outlet of the ethanol absorption tower is connected with an acetaldehyde rectifying tower through a booster pump, the tower top of the acetaldehyde rectifying tower is sequentially connected with a second cooler, a second gas-liquid separation tank and a reflux pump, and the reflux pump is further connected with the side wall of the top of the acetaldehyde rectifying tower; the tower bottom of the acetaldehyde rectifying tower is respectively connected with the top side wall of the ethanol absorption tower and the inlet of the reactor; and the tower bottom of the acetaldehyde rectifying tower is also provided with