Falling film desorption device

The utility model discloses a falling film desorption device. The falling film desorption device comprises a preheater, according to the utility model, the liquid outlet of the preheater is connected with the liquid injection port of the falling-film desorption tower through a pipeline, the gas-liquid separator is arranged on one side of the falling-film desorption tower, and through the cooperation of the preheater, the falling-film desorption tower, the gas-liquid separator, the condenser, the vacuum pump and other structures, the falling-film desorption tower and the gas-liquid separator are integrated. The purposes of improving the desorption regeneration efficiency of an absorbent absorbing carbon dioxide, improving the purity of desorbed carbon dioxide and achieving batch production and recycling of high-purity carbon dioxide are achieved, and a vacuum pump system is additionally arranged in the falling film desorption tower device, so that the desorption temperature is reduced, the energy consumption i