کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6469222 | 1423745 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Supersaturation effects on crystal habit and aspect ratio of benzoic acid.
- Benzoic acid crystal morphology changes from needle-like shape to rectangular sheet and then to hexagonal particles with the increasing supersaturation.
- Aspect ratio of benzoic acid crystal decreases with the increase of supersaturation.
- Modified attachment energy (MAE) model was used to evaluate the shape changes.
- Solvents interact with the crystal surface and selectively slow down the growth rate of exposed faces.
Supersaturation is a factor of great industrial importance to the crystal growth by affecting the final aspect ratio and morphology of organic compounds. In this work, the qualitative relationship between aspect ratio and supersaturation of benzoic acid (BA) was elucidated for the first time by experimental and simulative study. Experimentally, it was found that the crystal shape of BA changes from needle-like crystal to rectangular sheet and then to hexagonal particles with the increasing supersaturation ranging from 1.029 to 2.941. The increment of supersaturation decreases the average aspect ratio of crystallized particles from â¼20.5 to â¼1.3. Furthermore, a higher supersaturation (ÏÂ =Â 1.618) leads to more isotropic hexagonal crystals due to less face discrimination at high crystallization rates. Additionally, we predicted the supersaturation-dependent crystal habit by the modified attachment energy (MAE) model, which yield good agreement with the experimental observed crystals at medium and high supersaturations.
Journal: Computers & Chemical Engineering - Volume 99, 6 April 2017, Pages 296-303