NOVELTY - Chemical tail gas recycling device comprises a rectifying tower A, a rectifying tower B and a rectifying tower C. The lower part of the rectifying tower A is provided with a raw material inlet. The upper part of the rectifying tower A is provided with a waste gas outlet, and the bottom part is provided with a liquid fraction outlet. The lower part of the rectifying tower B is provided with a second evaporator. The middle part of the rectifying tower B is provided with a second liquid fraction inlet. The upper part of the rectifying tower B is provided with a nitrogen outlet.    USE - Used as a chemical tail gas recycling device.    ADVANTAGE - The device prevents the emission of insecure tail gas in factories, converts waste to valuable components, consumes less energy, and increases the additional value of the product.    DETAILED DESCRIPTION - Chemical tail gas recycling device comprises a rectifying tower A, a rectifying tower B and a rectifying tower C. The lower part of the rectifying tower A is provided with a raw material inlet. The upper part of the rectifying tower A is provided with a waste gas outlet, and the bottom part is provided with a liquid fraction outlet. The lower part of the rectifying tower B is provided with a second evaporator. The middle part of the rectifying tower B is provided with a second liquid fraction inlet. The upper part of the rectifying tower B is provided with a nitrogen outlet. The bottom part of the rectifying tower C is provided with a second liquid fraction outlet, a third evaporator and a liquid methane outlet. The upper part of the rectifying tower C is set provided a condenser and a liquid argon outlet. The middle part of the rectifying tower C is provided with the third liquid fraction inlet. The first liquid fraction outlet is connected to the second liquid fraction inlet. The second liquid fraction outlet is connected to the third liquid fraction inlet.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the chemical tail gas recycling device.