Device and method for pervaporation by energy cyclic utilization

The invention provides a device and a method for pervaporation by energy cyclic utilization, belonging to the technical field of separation. The device comprises a pervaporation membrane assembly, a vacuum pump and heat exchangers, wherein a heating medium of a first heat exchanger C is a mixture located at the side of permeation in the process of pervaporation; a cooling medium of the first heatexchanger C is a solution located at the side of interception in the process of pervaporation; and a cooling medium of a second heat exchanger D is a commonly-used low-temperature cooling medium. According to the invention, almost no additional energy is needed in the whole process, and strong applicability of an operation temperature range is achieved in the process of pervaporation, so low energy consumption is realized in the whole process, and a pervaporation process is expected to save energy by about 30% compared with a traditional pervaporation process; meanwhile, a third substance is not introduced, so the per