Minimum end time policies for batchwise radical chain polymerization—II A two-stage process for styrene polymerization

✍ Scribed by Show-An Chen; King-Fu Lin

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 988 KB
• Volume: 35
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(80)87011-4

✦ Synopsis

For styrene polymenzatlon, a two-stage process IS consldered The first stage, nntlated by mltlator, IS operated along the best rsothermal policy for a predetermined number average molecular weight and monomer conversion at end of the stage as described m the previous paper The second stage IS operated at higher temperature level at which thermal nutlatlon polymenzatlon IS sqqnticant A mathematical model IS proposed for descnbmg the changes of conversion and number average molecular weight wkth hme m the second stage based on the expenmentaf data obtained All parameters mvolved m the model are calculable usmg the kinetic constants of the mltlator untlatlon system and the thermal mltlatlon system Expenmental venticatgon on the optimal temperature pohcies for the second stage shows promlsmg Further calculations indicate that the optlmal two-stage process can be slgnrficantly better than the optimal process of mltlator uutlatlon or thermal mltlatlon polymenzation