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By Jean-Paul Duroudier

Crystallization and Crystallizers, a part of the business apparatus for Chemical Engineering set, defines tips to practice the choice and calculation of apparatus wanted within the uncomplicated operations of technique engineering, supplying trustworthy and easy tools, with this quantity offering a complete concentrate on crystallization and crystallizers.

Throughout those concise and easy-to-use books, the writer makes use of his colossal functional event and precision wisdom of world study to give an in-depth examine of various points in the box of chemical engineering.

  • The formation of crystals (or nucleation) is studied in its theoretical and sensible details
  • The writer additionally presents tools wanted for knowing the gear utilized in utilized thermodynamics
  • The chapters are complemented with appendices which offer more information in addition to any linked references

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Additional resources for Crystallization and Crystallizers

Sample text

E ins = E sous + E cou Here, all energy is counted positively (despite being a potential well in this case). 1). Δ E increases with the molecular mass of the additive. Both the size of the metastable zone and the crystallization induction time increase with the additive’s insertion energy. 3. 1. Form and specific surface Form is announced by a more or less equidimensional character of the crystal, that is, when the three main dimensions of an equidimensional crystal are not dissimilar. In the order of increasing non-sphericity, we can distinguish: – equidimensional crystals: pyramids, rhombohedra, tetrahedra, hexahedra (cubes), octahedra (cube with truncated corners), dodecahedra; – one dimension is slightly lower than the others (tablets); – one dimension is significantly lower than the others (plates, scales); – one dimension is slightly greater than the others (prisms); – one dimension is significantly greater than the others: acicular (rods, needles, fibers).

Primary nucleation All solutions contain agglomerates of solute that are increasingly numerous and significant on approaching the saturation temperature. These are known as crystal embryos. As a result of a Δµ supersaturation, the Gibbs energy variation of the embryonic solution (for crystal embryo formation) reaches its maximum. The crystal embryos with the corresponding size are the crystal seeds or nuclei. We should note that it is only by means of statistical fluctuations that the Gibbs energy can increase to its maximum.

The stress corresponding to fragile fracture is high in its value. In reality, fragile fracture occurs earlier than perfect crystal theory would expect. Indeed, this fracture occurs due to existing microcracks and, where the crystal has none, they can be created by high stress, even short in duration (as in the case of glass shattering with an impact). In practice, hardness can be measured in various ways: – perforation pressure using an indenter of low cross-section. This is the Vickers hardness test measured in MPa [YOR 83] as follows: Aspirin 85 KCℓ 174 NaCℓ 208 Sugar 624 – scratching a harder body and/or scratching a softer body with the body in question.

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