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Rapid evaluating caking tendency of nonspherical crystals by developing a shape-based crystal bridge growth model

Particuology 2024年第12期95卷 265-278页

作者： Mingxuan Li Mengdi Zhang Wei Zhao Leida Zhang Mingyang Chen Dandan Han Junbo Gong State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Institute of Shaoxing Tianjin UniversityShaoxing312300China Shandong Fuyang Biotechnology Co. Ltd.Dezhou253100China

crystal caking is a decisive factor affecting the quality of high-end fine chemicals,whereas lack of shape-to-caking understanding results in considerable waste of time,severely delaying high-end fine chemical *** this basis,a morphology-based caking evaluation model is developed with 74%and 96%time savings compared to previous modeling and non-modeling experiments,respectively,while guaranteeing superior *** crystal morphology is expressed as a function of the aspect ratio and the particle size *** quantitative relationships between these parameters and the caking tendency are deduced,firstly achieving morphology anti-caking criterion *** D-allulose crystals,considering humidity,and particle size,an aspect ratio is below 3 is the standard for combating caking,which has not been reported ***,the specific effect of crystal morphology on caking behavior is quantitatively *** knowledge obtained can be applied to rapidly and quantitatively design anti-caking storage systems for products in warehouses.

关键词： Caking evaluation crystal morphology D-allulose rod-like crystal crystal bridge growth model

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Hierarchical ZSM-11 with intergrowth structures:Synthesis,characterization and catalytic properties

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Journal of Energy Chemistry 2013年第5期22卷 761-768页

作者： Qingjun Yu Chaoyue Cui Qiang Zhang Jing Chen Yang Li Jinpeng Sun Chunyi Li Qiukai Cui Chaohe Yang Honghong Shan State Key Laboratory of Heavy Oil Processing Department of Chemical Engineering China University of Petroleum (East China) Dagang Petrochemical Company PetroChina Corporation

Hierarchical ZSM-11 microspheres with intercrystalline mesoporous properties and rod-like crystals intergrowth morphology have been synthesized using a spot of tetrabutylammonium as a single ***,FTIR,SEM,TEM and N2 adsorption analysis revealed that each individual particle was composed of nanosized rod crystals inserting each other and the intercrystalline voids existing among rods gave a significant mesopore size *** treatment result demonstrated the excellent hydrothermal stability of *** crystallization modes including constant temperature crystallization (one-stage crystallization) and two-stage temperature-varying crystallization with different 1st stage durations were *** results suggested that the crystallization modes were mainly responsible for the adjustable particle size and textural properties of samples while the small amount of tetrabutylammonium bromide was mainly used to direct the formation of both ZSM-11 framework and its intergrowth ***,the performance of optimal ZSM-11 as an active component for the catalytic pyrolysis of heavy oil was also *** with the commercial pyrolysis catalyst,the hierarchical ZSM-11 catalyst exhibited a high selectivity to desired products(LPG+gasoline+diesel),as well as a much lower dry gas and coke yield,plus a high selectivity and yield of light olefins(C=3 C=4)and very poor selectivity to ***,fully open micropore-mesopore connectivity would make such hierarchically porous ZSM-11 zeolites very attractive for applications in clean petrochemical catalysis field.

关键词： intercrystalline mesopore rod-like crystal single template crystallization modes accessibility hydrothermal stability catalytic pyrolysis

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