Experiments and model development of p-nitrochlorobenzene and naphthalene purification in a continuous tower melting crystallizer  

作　　者：Wenlong Xiao Yonglin Li Zhengming Yi Sheng Yang He’an Luo 

机构地区：[1]School of Chemical Engineering,Xiangtan University,Xiangtan 411105,China [2]School of Energy Science and Engineering,Central South University,Changsha 410083,China [3]College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411105,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第12期9-17,共9页中国化学工程学报（英文版）

基　　金：the financial support by China Hunan Provincial Education Department Innovation Platform Project (20k125);Postgraduate Scientific Research Innovation Project of Hunan Province (CX20210518);Postgraduate Scientific Research Innovation Project of Xiangtan University(XDCX2021B169)

摘　　要：With the increasing demand for high-purity products,the industrial application of melt crystallization technology has been highly concerned.In this study,the purification process of nitrochlorobenzene binary eutectic system(NBES)and naphthalene–benzothiophene solid solution system(NBSSS)in tower melting crystallizer is analyzed,and a mathematical model of crystallization process is established.The key parameters in terms of feed concentration,crystal bed height,reflux ratio and stirring speed effi-ciency on purification effects were discussed by the established model.The results show that the concentration of p-nitrochlorobenzene was purified from 90.85%to 99.99%,when the crystal bed height is 600 mm,the reflux ratio is 2.5,and the stirring speed is 12 rmin^(-1).The naphthalene concentration is purified from 95.89%to 99.99%,when the crystal bed height is 400 mm,the reflux ratio is 1.43,and the stirring speed is 16 rmin^(-1).The quality of the model is evaluated by the ARD(average relative deviation).The minimum ARD values of the NBES and NBSSS are 2.39%and 5.22%,respectively,indicating the model satisfactorily explains the purification process.

关 键 词：CRYSTALLIZATION Separation Mathematical modeling CRYSTALLIZER PURIFICATION 

分 类 号：TQ026.5[化学工程] TQ246.13TQ241.52