{"id":9436,"date":"2025-01-12T13:00:02","date_gmt":"2025-01-12T12:00:02","guid":{"rendered":"https:\/\/kluthe.com\/magazin\/?p=9436"},"modified":"2025-04-30T11:17:00","modified_gmt":"2025-04-30T09:17:00","slug":"what-does-fractionation-mean-in-chemistry","status":"publish","type":"post","link":"https:\/\/kluthe.com\/magazin\/en\/what-does-fractionation-mean-in-chemistry\/","title":{"rendered":"What Does Fractionation Mean in Chemistry?"},"content":{"rendered":"
\u00ab Separating Solvents and Other Applications of Fractionation Methods \u00bb<\/h2>\n
In chemistry, fractionation refers to the process of separating mixtures into their individual components. This is achieved using a variety of specialized chemical separation techniques. The term “fractionation” is typically used when mixtures consist of more than two substances that need to be isolated individually or in groups. Here you will find an overview of the most important methods and their areas of application.<\/strong><\/p>\n
Natural Phenomena Commonly Used in Fractionation<\/h2>\n
Chemistry often utilizes physical methods to separate mixtures. These methods harness natural phenomena such as:<\/p>\n
\n
Changing states of matter at different temperatures (e.g., distillation)<\/li>\n
Differing solubilities of substances (e.g., extraction, precipitation, absorption)<\/li>\n
The natural tendency toward concentration equilibrium (e.g., diffusion, osmosis)<\/li>\n
Selective accumulation of substances on the surface of solids (adsorption)<\/li>\n
Varied permeability of particles or molecules through porous solids (e.g., filtration, ultrafiltration)<\/li>\n<\/ul>\n\u00a9 motortion – stock.adobe.com<\/figcaption><\/figure>\n
Typically, these phenomena lead to equilibrium states where differences are balanced. In chemical fractionation, the intentional adjustment of process parameters such as concentration, temperature, pressure, shifts the equilibrium toward the desired outcome. Mixtures then form distinct phases with substances accumulating differently between each phase or concentrating at the interfaces. Phases may differ by state of matter (solid, liquid, gas) or by immiscibility (such as oil and water). They often separate spontaneously: gases escape from liquids and can be collected, solids settle as sediment, and immiscible liquids form distinct layers. If needed, fractionation is completed using filters, separators, or centrifuges.<\/p>\n\u00a9 tramster – stock.adobe.com<\/figcaption><\/figure>\n
Conducting Fractionation<\/h2>\n
Fractionation in chemistry typically involves sequentially applying different separation methods. For example, solids may first be filtered from a liquid mixture, followed by precipitating dissolved salts, filtering them out, and finally separating the remaining liquid mixture into its components through distillation processes. Each step produces two new fractions, either final products or further processed materials. Examples include:<\/p>\n
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Solvent extraction of plant oils from biomass<\/li>\n
Fractional distillation of crude oil or solvent mixtures<\/li>\n
Adsorption of organic pollutants onto activated carbon for wastewater treatment<\/li>\n
Adsorption of water vapor onto silica gel for air drying<\/li>\n
Reverse osmosis for seawater desalination<\/li>\n<\/ul>\n\u00a9 antonvimages – stock.adobe.com<\/figcaption><\/figure>\n
How Solvent Extraction Recovers Plant Oils from Biomass?<\/h2>\n
When extracting plant oils from biomass, oil-rich plant parts are mixed with petroleum ether or alcohol. The oils dissolve in the solvent. After the solids are filtered out, the solvent-oil mixture is distilled, resulting in pure oil. Small amounts of oil evaporate with the solvent; this vapor mixture condenses in a cooler and can be reused. Extraction, which involves selectively dissolving components, is frequently used in chemical fractionation. Liquid mixtures are combined with solvents that dissolve the target substances but remain immiscible with other components. This process creates two separate liquid phases, allowing the separation of the solvent and the extracted material.<\/p>\n\u00a9 motortion – stock-adobe.com<\/figcaption><\/figure>\n
Fractional Distillation of Crude Oil or Solvent Mixtures<\/h2>\n
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