Optimal Design for Reactivity Ratio Estimation: A Comparison of Techniques for AMPS/Acrylamide and AMPS/Acrylic Acid Copolymerizations

Processes

Alison J. Scott²  Marzieh Riahinezhad²  Alexander Penlidis¹ 

[1] Institute for Polymer Research (IPR), Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada;

关键词: acrylamide;    acrylic acid;    2-acrylamido-2-methylpropane sulfonic acid;    copolymerization;    design of experiments;    reactivity ratio estimation;   

DOI  :  10.3390/pr3040749

来源: mdpi

【 摘 要 】

Water-soluble polymers of acrylamide (AAm) and acrylic acid (AAc) have significant potential in enhanced oil recovery, as well as in other specialty applications. To improve the shear strength of the polymer, a third comonomer, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), can be added to the pre-polymerization mixture. Copolymerization kinetics of AAm/AAc are well studied, but little is known about the other comonomer pairs (AMPS/AAm and AMPS/AAc). Hence, reactivity ratios for AMPS/AAm and AMPS/AAc copolymerization must be established first. A key aspect in the estimation of reliable reactivity ratios is design of experiments, which minimizes the number of experiments and provides increased information content (resulting in more precise parameter estimates). However, design of experiments is hardly ever used during copolymerization parameter estimation schemes. In the current work, copolymerization experiments for both AMPS/AAm and AMPS/AAc are designed using two optimal techniques (Tidwell-Mortimer and the error-in-variables-model (EVM)). From these optimally designed experiments, accurate reactivity ratio estimates are determined for AMPS/AAm (r_AMPS = 0.18, r_AAm = 0.85) and AMPS/AAc (r_AMPS = 0.19, r_AAc = 0.86).

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.