Fractional crystallization (chemistry)

Fractional crystallization (chemistry)

In chemistry, fractional crystallization is a method of refining substances based on differences in solubility. If two or more substances are dissolved in a solvent, they will crystallize out of solution (precipitate) at different rates. Crystallization can be induced by changes in concentration, temperature or other means.A process by which a chemical compound is separated into components by crystallization. In fractional crystallization the compound is mixed with a solvent, heated, and then gradually cooled so that, as each of its constituent components crystallizes, it can be removed in its pure form from the solution

This technique is often used in chemical engineering to obtain very pure substances, or to recover sellable products from waste solutions.

Fractional crystallization can be used for purification or analysis.

ee also

* Crystal
* Crystal structure
* Crystallite
* Crystallization and engineering aspects
* Recrystallization
* Seed crystal
* Single crystal

References

* [http://acaschool.iit.edu/lectures04/JLiangXtal.pdf "Small Molecule Crystalization"] (PDF) at Illinois Institute of Technology website


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Fractional crystallization (geology) — Crystallization Concepts …   Wikipedia

  • Fractional crystallization — may refer to:* Fractional crystallization (chemistry), a process to separate different solutes from a solution * Fractional crystallization (geology), a natural process occurring in igneous rocks during which precipitation of minerals takes place …   Wikipedia

  • Crystallization — Crystallizing and Crystallized redirect here. For the action adventure video game, see Crystalis. For the 2009 song by The xx, see Crystalised. For other uses, see Crystallization (disambiguation). Crystallization …   Wikipedia

  • Crystallization (engineering aspects) — In chemical engineering crystallization occurs in a crystallizer. Crystallization is a unit operation through which a chemical compound, dissolved in a given solvent, precipitates under certain conditions to allow successive separation between… …   Wikipedia

  • Fractional freezing — is a process used in process engineering and chemistry to separate two liquids 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… …   Wikipedia

  • Portal:Chemistry — Wikipedia portals: Culture Geography Health History Mathematics Natural sciences People Philosophy Religion Society Technology …   Wikipedia

  • Recrystallization — (see also crystallization) is a physical process that has meanings in chemistry, metallurgy and geology.ChemistryIn chemistry, recrystallization is a procedure for purifying compounds. The most typical situation is that a desired compound A is… …   Wikipedia

  • Single crystal — A huge KDP crystal grown from a seed crystal in a supersaturated aqueous solution at LLNL which is to be cut into slices and used on the National Ignition Facility for frequency doubling and tripling. A single crystal or monocrystalline solid is… …   Wikipedia

  • Crystal growth — Crystallization Concepts …   Wikipedia

  • igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”