| 초록 |
L-methionine, the sulfur-containing essential amino acid, has been widely used as feed additives for poultry and swine nutrition. In general, when L-methionine crystallized from water by cooling, agglomerates with laminate or hollow structures are produced. Bulk density of those agglomerates is smaller than 300 g/L due to empty spaces inside particles. In the present work, a crystallization process by pH shift was developed for improvement of bulk density. An instantaneous pH increase of L-methionine aqueous solution with low pH was observed to accelerate the nucleation rate due to rapid generation of high supersaturation. In the suspension with a large population of tiny crystals of L-methionine, dense agglomerates with the bulk density of 750 g/L was found to be produced by strong shear stress provided by fast agitation. |
