METHOD FOR CONDENSING WATER-SOLUBLE ORGANIC MATTER AND DEVICE FOR CONDENSING WATER-SOLUBLE ORGANIC MATTER

摘要

[Problem] To provide a method and device for condensing water-soluble organic matter that make it possible to recover highly concentrated water-soluble organic matter, save energy, and by reducing the surface area of membranes, reduce the cost of the device. [Solution] This invention makes it possible to provide a technology that uses a hybrid process combining distillation via a distillation column (2) with membrane separation via separation-membrane devices (51, 52) provided with a plurality of vapor-permeation separation membranes (5). Without sacrificing energy efficiency, a vapor-permeation separation membrane (5) located immediately before at least the final outflow port on the retentate side of one separation-membrane device (52) has a lower permeation-rate ratio than another vapor-permeation separation membrane (5), making it possible to obtain highly concentrated condensed water-soluble organic matter and also making it possible to reduce the total surface area of the vapor-permeation separation membranes (5) in the separation-membrane devices (51, 52), leading to a reduction in the cost of the device.