2010
DOI: 10.1016/j.jcrysgro.2010.06.005
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Crystallization of zinc lactate in presence of malic acid

Abstract: International audiencehe influence of malic acid, which acts as an impurity on the cooling crystallization of zinc lactate is investigated in this paper by monitoring the relative supersaturation and the number of crystals during crystallization. The presence of malic acid increases the solution solubility and makes the metastable zone wider; it also changes the habit of the crystal. The purity of the final products is shown to be influenced by the amount and size of seed crystals, cooling rate, seeding temper… Show more

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Cited by 16 publications
(17 citation statements)
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“…In principle, additives can regulate the shape of the crystals, either by inhibiting the growth of facets or by promoting the growth of certain directions. , While there is abundant research concerning the inhibition effect by natural and synthetic molecules at low concentration, literature about promoting crystal growth by using additives is comparatively rare. Dowling et al expounded that malonic and aspartic acids drastically accelerate the growth of γ-glycine along the polar axis, possibly because additives disrupt a layer of bound solvent, thus reducing the activation energy for desolvation and facilitate growth.…”
Section: Introductionmentioning
confidence: 99%
“…In principle, additives can regulate the shape of the crystals, either by inhibiting the growth of facets or by promoting the growth of certain directions. , While there is abundant research concerning the inhibition effect by natural and synthetic molecules at low concentration, literature about promoting crystal growth by using additives is comparatively rare. Dowling et al expounded that malonic and aspartic acids drastically accelerate the growth of γ-glycine along the polar axis, possibly because additives disrupt a layer of bound solvent, thus reducing the activation energy for desolvation and facilitate growth.…”
Section: Introductionmentioning
confidence: 99%
“…The determination of the metastable zone width is essential for the optimization of reasonable crystallization process and further design of the crystallizer. The product with desired quality can only be realized by controlling the supersaturation within the metastable region throughout the crystallization process. Many factors, such as initial solution concentration, impurities, cooling rate, selected solvent, working volume, and stirring rate, were shown to alter the values of metastable zone width. Among them, the effects of impurity on the metastable zone width can be attributed to the change on nucleation and growth mechanism of the compound of interest and is therefore difficult to foresee. Various effects of impurities can be observed: the impurities where shown to enhance the metastable zone width of compounds while other impurities turned out to reduce the width of metastable zone of the same compounds. Effects of impurity concentration on the metastable zone width can also be observed: the metastable zone width either increases or decreases when adding more impurities in the crystallization system. , …”
Section: Introductionmentioning
confidence: 99%
“…EFC is a relatively novel purification technique that has been applied to separate pure ice and salts from saline industrial streams. A very attractive advantage of EFC is its ability to simultaneously crystallize ice and salt, which can undergo gravitational separation due to their density differences; ice floats and the salt settles. Additionally, EFC requires less energy when compared to evaporative crystallization (EC) because the heat of vaporization of water is 6.7 times higher than the heat of fusion . On the other hand, problems associated with ice incrustation during EFC have been under research, , but the extent of ice scaling largely depends on the characteristics of the system and operating conditions in the crystallizer.…”
Section: Introductionmentioning
confidence: 99%
“…The common presence of about 70 organic compounds and some inorganic impurities in petrochemical wastewater streams , influences the salt and ice crystallization processes and consequently the crystal characteristics and purity. Despite extensive studies conducted to investigate the influence of impurities on the crystallization of diverse compounds, ,, there is little information on the effect of soluble organic compounds on ice and salt crystallization from petrochemical saline aqueous solutions.…”
Section: Introductionmentioning
confidence: 99%