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Crystallization - Wikipedia, the free encyclopedia (461 words) |
 | Crystallization is the (natural or artificial) process of formation of solid crystals from a homogeneous solution. |
| It is at the stage of nucleation that the atoms arrange in a defined and periodic manner that defines the crystal structure — note that "crystal structure" is a special term that refers to the internal arrangement of the atoms, but NOT the physical external macroscopic properties of the crystal, size and shape. |
| The crystal growth is the subsequent growth of the nuclei that succeed in achieving the critical cluster size. |
| Separation process by fractional crystallization - Patent 3959978 (1620 words) |
| to -10.degree.C to crystallise part of the paraxylene, separating crystals of the paraxylene from the mother liquor, washing the separated crystals with a wash liquid, chilling the mother liquid in the presence of at least part of the wash liquid to a temperature in the range of -40.degree. |
| It is also known to wash such crystals with a wash liquid, which is normally chosen so as to be miscible with the mother liquor, not to dissolve an excessive proportion of the crystallised component, and to be readily separable from the mother liquor especially by distillation. |
| to -10.degree.C to form a slurry containing paraxylene crystals and a mother liquor, separating the crystals, for example by centrifuging, washing the crystals with a suitable wash liquid, for example pentane, methanol or mixtures of methanol and water, chilling the mother liquor in the presence of wash liquid to -40.degree. |
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