Melt crystallization

Ulrich, Joachim; Bülau, Henrik

doi:10.1016/b978-075067012-8/50009-4

Cited by 27 publications

(13 citation statements)

References 20 publications

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“…Future work could investigate the impact of the speed of cooling as well as incorporation of additives to control crystallisation structure. Since this is a crystallisation process then incorporation of seeding to initiate crystallisation as well as cooling rate should be investigated [65].…”

Section: Discussionmentioning

confidence: 99%

Measuring the permeability of thin solid layers of natural waxes

York

Collins

Rantape

2019

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 99%

Measuring the permeability of thin solid layers of natural waxes

York

Collins

Rantape

2019

Journal of Colloid and Interface Science

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“…Solvent-assisted crystallization techniques are widely applied to purify organic compounds [8][9][10]. Nevertheless, simple recrystallizations generally lead to limited purifying effects when the compound to purify exhibits a solid solution with the impurities.…”

Section: Introductionmentioning

confidence: 99%

“…Among many purification techniques like preparative chromatography [7], phase-separation-based methods, etc., crystallization is one of the most employed techniques to purify chemical species. It offers a large panel of methods that can be combined when appropriate, e.g., solventassisted crystallization [8,9], crystallization from the melt [10] or from the gas phase [11].…”

Section: Introductionmentioning

confidence: 99%

Phenanthrene Purification: Comparison of Zone Melting and Co‐Crystallization

Burel¹,

Vlieg²,

Mignot³

et al. 2016

Chem Eng & Technol

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The purification of phenanthrene is a prerequisite before studying its solid-solid phase transition at the molecular scale. Two purification methods, namely, zone melting and co-crystallization with 3,5-dinitrobenzoic acid, were separately studied and compared, in view of reaching ultrapurity which means a purity of > 99.9 mol %. An explanation of the relationship between the efficiency of both techniques by using phase diagrams has been attempted. A novel strategy is proposed to optimize phenanthrene ultrapurification based on a combination of the two methods.

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“…Melt crystallization is a low-energy separation method that typically uses a low processing temperature close to room temperature. This is an advantage when working with thermally unstable 2 of 14 substances or organic compounds that tend to react and decompose at higher temperatures [10]. Freeze concentration of an aqueous solution is one type of melt-based crystallization method and this is defined as the separation of formed ice from the aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Freeze Concentration of Aqueous [DBNH][OAc] Ionic Liquid Solution

et al. 2020

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In the present work, freeze crystallization studies, as a novel concentration method for aqueous 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]) ionic liquid solution, were conducted. In order to find the appropriate temperature and composition range for freeze crystallization, the solid–liquid equilibrium of a binary [DBNH][OAc]–water compound system was investigated with differential scanning calorimetry (DSC). Results of this analysis showed that the melting temperature of the pure ionic liquid was 58 ℃, whereas the eutectic temperature of the binary compound system was found to be −73 ℃. The activity coefficient of water was determined based on the freezing point depression data obtained in this study. In this study, the lowest freezing point was −1.28 ℃ for the aqueous 6 wt.% [DBNH][OAc] solution. Ice crystal yield and distribution coefficient were obtained for two types of aqueous solutions (3 wt.% and 6 wt.% [DBNH][OAc]), and two freezing times (40 min and 60 min) were used as the main parameters to compare the two melt crystallization methods: static layer freeze and suspension freeze crystallization. Single-step suspension freeze crystallization resulted in higher ice crystal yields and higher ice purities when compared with the single-step static layer freeze crystallization. The distribution coefficient values obtained showed that the impurity ratios in ice and in the initial solution for suspension freeze crystallization were between 0.11 and 0.36, whereas for static layer freeze crystallization these were between 0.28 and 0.46. Consequently, suspension freeze crystallization is a more efficient low-energy separation method than layer freeze crystallization for the aqueous-ionic liquid solutions studied and, therefore, this technique can be applied as a concentration method for aqueous-ionic liquid solutions.

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Melt crystallization

Cited by 27 publications

References 20 publications

Measuring the permeability of thin solid layers of natural waxes

Measuring the permeability of thin solid layers of natural waxes

Phenanthrene Purification: Comparison of Zone Melting and Co‐Crystallization

Freeze Concentration of Aqueous [DBNH][OAc] Ionic Liquid Solution

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