2 results about "Crystal size distribution" patented technology

This application relates to a method for preparing crystalline D-psicose. In this application, crystalline D-psicose is prepared by combining an evaporation crystallization method with a cooling crystallization method, which simplifies the preparation process, facilitates operation, and reduces crystallization time. In this application, a seed crystal is added when the solids content is relatively low (70-75%) during the evaporation crystallization process. This facilitates crystallization, uniformizes the crystal growth rate in each direction, shortens the overall crystallization time, and reduces energy consumption. After evaporation crystallization is complete, crystal shaping is carried out to achieve uniform crystal size, a smooth crystal surface, and a refined crystal form.After crystal regulation, crystallization by cooling is carried out, and the cooling frequency at specific intervals is designed based on the metastable region curve of D-psicose. Once crystallization is completed using the preparation method described in this application, the resulting crystal exhibits high yield, a narrow crystal size distribution, a smooth surface, a mirror-like surface, good reflectivity, and a regular crystal form.

The present invention concerns a zeolitic adsorbent agglomerate comprising at least one zeolite of faujasite type comprising barium and / or potassium, of porosity between 25% and 45%, and having a standard deviation σ of crystal size distribution in said agglomerate of less than 0.30 μm.The invention also concerns the use of the zeolitic adsorbent agglomerate for the separation of hydrocarbon mixtures, and the process for separating hydrocarbon mixtures using said zeolitic adsorbent agglomerate.