| 摘要 |
PURPOSE:To improve removal efficiencies of noncrystalline particles of crud by adding substances having weak acidic-cation-exchange groups to a filter desalting device provided with strong acidic-cation-exchange resins and strong basic-anion-exchange resins. CONSTITUTION:Substances having weak acidic-cation-exchange groups are added into a filter desalting device provided with strong acidic-cation-exchange resins and strong basic-anion-exchange resins at a ratio of 30% or less by volume per total volume, where said substances have one of ion-exchange groups such as carboxylic acid, phosphoric acid, acetic acid, etc., and are formed into particles or fibrous form. As a result, collection rate of crud increases, and noncrystalline crud, which is not easily captured, can be captured, so that crud removal performance can be improved by tens of % compared to a conventional desalting device. |
