Rectifying tower for food-grade carbon dioxide production

The utility model discloses a rectifying tower for food-grade carbon dioxide production. The carbon dioxide liquefying tower comprises a tower body, a condenser mounted on the tower body and a carbondioxide liquefier connected with the tower body, a feeding pipe is arranged on the side wall of the upper part of the tower body; a sieve plate is arranged in the tower body below the feeding pipe; agas-collecting hood is arranged at the top of the tower body; wherein a reboiler is arranged on the side wall of the lower part of the tower body, a U-shaped pipe connected with a carbon dioxide liquefier is arranged on the tower body above the reboiler, a heating sleeve is arranged on the U-shaped pipe, an exhaust pipe connected with the carbon dioxide liquefier is also arranged at the top of theU-shaped pipe, and a heat exchange pipeline wound on a circulating pipeline is connected to the carbon dioxide liquefier. According to the utility model, the gas collecting hood is arranged on the tower body, and carbon dioxid