TRANSIENT-RESPONSE OF CONTINUOUS-FLOW STIRRED-TANK POLYMERIZATION REACTORS

被引:21
作者
COZEWITH, C
机构
[1] Exxon Chemical Co, Linden, NJ, USA, Exxon Chemical Co, Linden, NJ, USA
关键词
CHEMICAL REACTIONS - Reaction Kinetics - COPOLYMERS - Physical Properties - POLYMERIZATION - Mathematical Models;
D O I
10.1002/aic.690340211
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The transient behavior of polymer properties following a step change in feed conditions during copolymerization in a continuous-flow stirred-tank reactor has been investigated by both modeling and experiment. For kinetics appropriate to Ziegler catalyzed olefin polymerization, the dynamic response of polymer molecular weight and composition is predicted to be relatively slow; four to six reactor turnovers could be required to reach steady state. In addition, response time depends on the direction and magnitude of change and is generally shorter when a property value is decreased. These model predictions were confirmed by measurement of the transient response of copolymer composition and molecular weight for ethylene-propylene-ethylidene norbornene terpolymerization. The model equations also were used to simulate reactor startups, and it was found that steady state following a startup can be reached in about three reactor turnovers. The initial absence of polymer in the reactor causes the dynamic response to be faster for a startup than for reactor control.
引用
收藏
页码:272 / 282
页数:11
相关论文
共 7 条
[1]   ETHYLENE-PROPYLENE COPOLYMERS - REACTIVITY RATIOS, EVALUATION, AND SIGNIFICANCE [J].
COZEWITH, C ;
VERSTRAT.G .
MACROMOLECULES, 1971, 4 (04) :482-&
[2]  
COZEWITH C, 1980, 73RD AICHE ANN M
[3]  
Gardner I. J., 1973, RUBBER CHEM TECHNOL, V46, P1019
[4]  
MacGregor JF, 1984, POLYM PROCESS ENG, V2, P179
[5]   AGITATION OF VISCOUS NEWTONIAN AND NON-NEWTONIAN FLUIDS [J].
METZNER, AB ;
FEEHS, RH ;
RAMOS, HL ;
OTTO, RE ;
TUTHILL, JD .
AICHE JOURNAL, 1961, 7 (01) :3-9
[6]  
Podol'nyi Y.B., 1974, POLYM SCI USSR, V16, P3224
[7]  
Pronyayev V.N., 1985, POLYM SCI USSR, V27, P1448