Seek advice on solvent crystallization

Solvent crystallization is a common chemical process primarily used for extracting and purifying substances. In experiments, we usually dissolve a certain substance in an appropriate solvent, and then cause the dissolved substance to crystallize by lowering the temperature or evaporating the solvent. As for the phenomenon of a powdery texture after crystallization, there are mainly the following possible reasons: 1. **Too fast crystallization rate**: If the crystallization process is too rapid, many small crystals may form instead of large single crystals. These small crystals easily turn into powder during drying and collection. 2. **Properties of the substance itself**: Some substances are in powder form in their solid state, which depends mainly on their crystal structure and physical properties. 3. **Crushing during processing**: During processes such as crystallization, filtration, and drying, improper handling can lead to the crushing of crystals, resulting in a powder. 4. **Solvent selection**: The solvent chosen also affects the crystal form. Some solvents may cause the crystalline substance to form smaller crystals. To change this situation, one can try adjusting the crystallization rate, for example by gradually lowering the temperature rather than cooling it rapidly ； Or try using other solvents. Furthermore, efforts should also be made to avoid breaking the crystals during the operation. .

Bro, for all materials that require crystallization or growth, whether through thermal or cold crystallization processes, a thorough impurity removal process is essential – this is key

Large particles may not have high purity; crystallization is influenced by various factors. If the solvent cannot be changed, extending the crystallization time can help obtain larger crystal forms

We won’t consider changing the solvent; the crystallization time should be long enough – 24 hours. Sometimes the crystallization works well, and other times it doesn’t (too much powder)