PROBLEM TO BE SOLVED: To achieve an efficiency increase or a suppression of running cost in concentrating an oral or external application liquid with many solids (or high viscosity) such as a beverage or liquid food.SOLUTION: A forward permeable membrane 5 is used as concentration means. A part of moisture content contained in a raw material liquid is transferred into a water-absorbing liquid passage chamber 7 via the forward permeable membrane 5 from a raw material liquid passage chamber 6. The water-absorbing liquid circulates through the raw material liquid concentration part 1 and the water-absorbing liquid concentration part 2 to recover concentration by the water-absorbing liquid concentration part 2 of evaporation condensation type. Condensation water in an amount equal to an exhaust out of the raw material liquid concentration part 1 is exhausted outside the system from a condensed water exhaust pipe 29. Heat can be exchanged with a diluted treatment liquid flowing through a water-absorbing exhaust pipe 16 from concentrated water-absorbing liquid and condensation water via first and second preheaters 3, 4. This process can promotes evaporation in an evaporation can 19 to contribute to suppress running cost and prevent a quality change of the raw material liquid by increasing the temperature of the concentrated water-absorbing liquid.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】飲料や液状食品のような固形物が多い(或いは粘度が高い)経口又は外用液体を濃縮するにおいて、効率アップやランニングコスト抑制等を図る。【解決手段】濃縮手段として正浸透膜5を使用する。原料液に含まれた水分の一部は、原料液通過室6から正浸透膜5を介して吸水液通過室7に移行する。吸水液は、原料液濃縮部1と吸水液濃縮部2とを循環し、蒸発・凝縮式の吸水液濃縮部2によって濃度が回復する。原料液濃縮部1から排出された量と同等の凝縮水は、凝縮水排出管29から系外に排出される。吸水液排出管16を流れる希釈処理液に、濃縮済み吸水液と凝縮水とから第1及び第2の予熱器3,4を介して熱交換できる。これにより、蒸発缶19での蒸発を促進してランニングコスト抑制に貢献できると共に、濃縮済み吸水液を降温させて原料液の品質変化も防止できる。【選択図】図1
