Enhancement in Bulk Density of l -Methionine Agglomerates by Cooling Crystallization with pH Control Using Additives
| Autor: | Kee-Kahb Koo, Wang-Soo Kim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supersaturation
Aqueous solution 010405 organic chemistry Chemistry Protonation General Chemistry Electrolyte 010402 general chemistry Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention Ion chemistry.chemical_compound Chemical engineering law Agglomerate General Materials Science Crystallization Sodium acetate |
| Zdroj: | Crystal Growth & Design. 19:3469-3476 |
| ISSN: | 1528-7505 1528-7483 |
| DOI: | 10.1021/acs.cgd.9b00340 |
| Popis: | A cooling crystallization process with pH control was proposed to produce l-methionine (l-Met) agglomerates with improved bulk densities. l-Met was crystallized upon increasing the pH of an acidic l-Met solution by the injection of an electrolyte aqueous solution. Considering factors including the salting-out effect of the cation and hydrogen ion acceptability of the anion, sodium acetate was selected as an electrolyte. When acetate ions were added to the acidic l-Met solution, supersaturation was generated by the pH increase owing to the protonation of acetate ions. It was found that, as the decreasing rate of hydrogen ion concentration was faster, the metastable zone width, represented as a function of hydrogen ion concentration, increased and denser agglomerates were formed. Furthermore, when the suspension was cooled subsequently, l-Met agglomerates with the bulk density of 760 g/L were obtained, which was about 4-fold higher than that of hollow-structured agglomerates produced from a neutral l-Met so... |
| Databáze: | OpenAIRE |
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