Method for Concentrating Raw Material Solution, and System for Concentrating Raw Material Solution

A concentration method for a feed solution containing a solute and a solvent to obtain a concentrate of the feed solution, wherein

• the solvent contains water and an organic solvent, and
• the concentration method comprises a combination of
• a first concentration method of removing water in the feed solution by a forward osmosis method using a forward osmotic membrane, and
• a second concentration method of removing water and the organic solvent in the feed solution through evaporation using a membrane module for distillation,
• wherein the forward osmotic membrane and the membrane module for distillation are configured such that the first concentration method occurs after the second concentration method.

A concentration method for a feed solution containing a solute and a solvent to obtain a concentrate of the feed solution, wherein

• the solvent contains water and an organic solvent, and
• the concentration method comprises a combination of
• a first concentration method of removing water in the feed solution by a forward osmosis method using a forward osmotic membrane, and
• a second concentration method of removing water and the organic solvent in the feed solution through evaporation using a membrane module for distillation,
• wherein the forward osmotic membrane and the membrane module for distillation are configured such that the second concentration method occurs after the first concentration method.