Concentrator for oral liquid and concentration method

摘要

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 1