On the basis of analysis of key engineering factors predominating in cationic polymerization, butyl rubber (IIR) as an example was synthesized by cationic polymerization in the high-gravity environment generated by a rotating packed bed (RPB) reactor. The influence of the rotating speed, packing thickness, and polymerization temperature on the number average molecular weight (Mn) of IIR was studied. The optimum experimental conditions were determined as rotating speed of 1200 r min−1, packing thickness of 40 mm and polymerization temperature of 173 K, where IIR with Mn of 289,000 and unimodal molecular weight distribution of 1.99 was obtained. According to the experimental results and elementary reactions, a model for the prediction of Mn was developed, and the validity of the model was confirmed by the fact that most of the predicted Mns agreed well with the experimental data with a deviation within 10%. © 2009 American Institute of Chemical Engineers AIChE J, 2010

Cationic Polymerization in Rotating Packed Bed Reactor: Experimental and Modeling

Retrospect and Perspective of Micro-mixing Studies in Stirred Tanks

Study on phenol sulfonation by concentrated sulfuric acid: Kinetics and process optimization

Computational chemical engineering – Towards thorough understanding and precise application

WITHDRAWN: Computational chemical engineering - Towards thorough understanding and precise application

1 INTRODUCTION When a fluid is injected into a turbulence field to mix with another fluid,twohomogenization processes take place simultaneously:micromixing(on the molecularscale)and macromixing(on the mixer scale).For micromixing,three successive stages arerecognized at high Schmidt number(1)turbulent dispersion,in which the original ma-terial lumps are dispersed by turbulence into discrete elements with smallest eddy sizeλ_k;(2)viscous deformation,in which the size of the elements is further reduced

Simplified framework for description of mixing with chemical reactions (i) physical picture of micro- and macromixing

运用高速显微摄影方法对１０￣１…１０￣３ｕｍ尺度上的微观混和过程进行了实验观察，将物质微元的形态特征归结为片状与条状两类。在此基础上，提出了片状结构模型，将微观混和描述为片状微元上的收缩变形与分子扩散。分析表明，由于变形与扩散之间的相互作用，微元上分子扩散区的宽度将趋于某一尺度δ＝１２λＢ，从而使微元体积呈指数增长，ｖ～ｅｘｐ（ｓｆ）．微观混和对化学反应的影响可用Ｄａｍｋ６ｈｌｅｒ数Ｄａ来表征，模型能够正确模拟这种影响。

陈甘棠

Papers

Simplified framework for description of mixing with chemical reactions (i) physical picture of micro- and macromixing

Morphological configurations of materialelements durng turbulent mixing──experimental study and modelling