Falling film crystallization kinetics of paraxylene

WANG Rui; XU Yanxia; SONG Xingfu; XU Zhigang; YU Jianguo

doi:10.11949/j.issn.0438-1157.20180134

您当前的位置：

首页 >

文章列表页 >

Falling film crystallization kinetics of paraxylene

更新时间：2025-12-10

- Falling film crystallization kinetics of paraxylene
- CIESC Journal Issue 8, Pages: 3460-3468(2018)
- 作者机构：
  
  1. 华东理工大学国家盐湖综合利用工程技术研究中心,上海,200237
  2. 常州瑞华化工工程技术有限公司,江苏,常州,213000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180134
  CLC： Q026.7TQ241.1
- Online First：05 August 2018，
  
  Published：05 August 2018
- 稿件说明：
移动端阅览
WANG Rui, XU Yanxia, SONG Xingfu, et al. Falling film crystallization kinetics of paraxylene[J]. CIESC Journal, 2018, (8): 3460-3468.
DOI：

WANG Rui, XU Yanxia, SONG Xingfu, et al. Falling film crystallization kinetics of paraxylene[J]. CIESC Journal, 2018, (8): 3460-3468. DOI： 10.11949/j.issn.0438-1157.20180134.

摘要

降膜结晶是工业生产对二甲苯的重要方法。以多孔介质分形理论为基础开展对二甲苯降膜结晶动力学的研究。通过动力学模型优化实验条件，结晶条件为进料速度为60 ml·min-1、结晶温度-15℃、原料预冷温度25℃，发汗条件为升温速率1℃·min-1、发汗终温5℃。在此条件下测定降膜结晶过程中对二甲苯结晶量以及液相夹带量，建立了晶体生长速率方程和液相夹带速率方程，相关系数分别为0.967和0.977，模型可靠。结果表明随着过饱和度的增加，液相夹带速率增长更快，晶层中夹带液相体积分数越大，晶层孔隙率越大。晶体生长速率方程和液相夹带速率方程的建立对工业降膜结晶生产对二甲苯过程中，通过调节液膜过饱和度控制晶层生长具有重要参考意义。

Abstract

Falling film crystallization is an important production method of paraxylene in industry. The falling film crystallization kinetics of paraxylene was studied based on the fractal and porous media theory. The experimental conditions were optimized by kinetic modeling. The crystallization conditions were feeding speed of 60 ml·min-1

crystallization temperature of -15℃ and raw material precooling temperature of 25℃

and sweating conditions were heating rate 1℃·min-1

and sweating end temperature of 5℃. Under the optimized experimental conditions

the crystal growth rate equation and the liquid entrapment rate equation were built by measuring the amount of paraxylene crystallization and liquid entrapment

and the correlation coefficients were 0.967 and 0.977. The results show that the liquid entrapment rate increases faster

and the volume fraction of the liquid entrapment in the crystal layer increases with the augment of supersaturation

resulting in the increase of porosity in the crystal layer. The establishment of crystal growth rate equation and liquid entrapment rate equation has important significance for the control of the crystal layer growth by adjusting the liquid film supersaturation in the industrial paraxylene production by falling film crystallization.

关键词

Keywords

references

Views

119

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Multi-objective optimization and simulation of lysozyme protein crystallization

Optimization of wet process phosphoric acid hemihydrate process and crystallization of gypsum

Study on hydrothermal crystallization kinetics of magnesium oxysulfate nanowires

Research of lithium carbonate three-phase reactive crystallization process

Modeling and experimental study of additives on solution crystallization of aspirin

Related Author

ZHOU Guangzheng

WANG Xuezhong

ZHOU Haoyu

SU Xiaodan

ZHU Ganyu

LI Huiquan

ZHENG Guangming

MENG Ziheng

Related Institution

Beijing Key Laboratory of Enze Biomass Fine Chemicals, College of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology

School of Chemistry and Chemical Engineering, University of Jinan

CAS Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences

Hubei Three Gorges Laboratory

School of Chemical Engineering, University of Chinese Academy of Sciences

⁰