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raffinate
In chemical separation terminology, the raffinate (from French ''raffiner'', to refine) is a product which has had a component or components removed. The product containing the removed materials is referred to as the extract. For example, in solvent extraction, the raffinate is the liquid stream which remains after solutes from the original liquid are removed through contact with an immiscible liquid. In metallurgy, raffinating refers to a process in which impurities are removed from liquid material.〔Wankat, P. (2007). ''Separation Process Engineering'' (2nd ed.). Upper Saddle River NJ: Prentice Hall.〕
In pressure swing adsorption the raffinate refers to the gas which is not adsorbed during the high pressure stage. The species which is desorbed from the adsorbent at low pressure may be called the "extract" product.
==Types ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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