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  2. List of purification methods in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_purification...

    Crystallization separates a product from a liquid feed stream, often in extremely pure form, by cooling the feed stream or adding precipitants that lower the solubility of the desired product so that it forms crystals. The pure solid crystals are then separated from the remaining liquor by filtration or centrifugation.

  3. Crystallization - Wikipedia

    en.wikipedia.org/wiki/Crystallization

    The ease with which molecules will crystallize strongly depends on the intensity of either atomic forces (in the case of mineral substances), intermolecular forces (organic and biochemical substances) or intramolecular forces (biochemical substances). Crystallization is also a chemical solidliquid separation technique, in which mass transfer ...

  4. Recrystallization (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Recrystallization_(chemistry)

    Once single perfect crystals have been obtained, it is recommended that the crystals are kept in a sealed vessel with some of the liquid of crystallization to prevent the crystal from 'drying out'. Single perfect crystals may contain solvent of crystallization in the crystal lattice. Loss of this internal solvent from the crystals can result in ...

  5. Fractional crystallization (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Fractional_crystallization...

    In chemistry, fractional crystallization is a stage-wise separation technique that relies on the liquidsolid phase change. This technique fractionates via differences in crystallization temperature and enables the purification of multi-component mixtures, as long as none of the constituents can act as solvents to the others. Due to the high ...

  6. Fractional freezing - Wikipedia

    en.wikipedia.org/wiki/Fractional_freezing

    Fractional freezing is a process used in process engineering and chemistry to separate substances with different melting points. It can be done by partial melting of a solid, for example in zone refining of silicon or metals, or by partial crystallization of a liquid, as in freeze distillation, also called normal freezing or progressive freezing.

  7. Separation process - Wikipedia

    en.wikipedia.org/wiki/Separation_process

    A separation process is a method that converts a mixture or a solution of chemical substances into two or more distinct product mixtures, [1] a scientific process of separating two or more substances in order to obtain purity. At least one product mixture from the separation is enriched in one or more of the source mixture's constituents.

  8. Chemical transport reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_transport_reaction

    These intermediates then are free to move around the inside of the tube via diffusion or convection (point B), and when they reach point C some of the gaseous species react to form solid products. In chemistry, a chemical transport reaction describes a process for purification and crystallization of non-volatile solids. [1]

  9. Water of crystallization - Wikipedia

    en.wikipedia.org/wiki/Water_of_crystallization

    In some contexts, water of crystallization is the total mass of water in a substance at a given temperature and is mostly present in a definite (stoichiometric) ratio. Classically, "water of crystallization" refers to water that is found in the crystalline framework of a metal complex or a salt , which is not directly bonded to the metal cation .

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