Title: Comparative Performance of Polymers with Different Architecture as Calcium Oxalate Inhibitors
Learner Objectives:
The focus of the paper is to present comparative performance data on polymers with different molecular strucure as calcium oxalate inhibitors.
Content/Topic Outline:
Presenter:
Zahid Amjad, PhD
Presentation Description:
Formation of calcium oxalate salts in industrial and biological systems poses serious challenges. Three types of calcium oxalate salts (e.g., calcium oxalate monohydrate, CaC2O4.2H2O, COM; calcium oxalate dihydrate, CaC2O4.2H2O, COD; calcium oxalate trihydrate, CaC2O4, .3H2O, COT) can form in solutions supersaturated with respect to calcium oxalate. Among these salts, COM is thermodynamically more stable compared to COD and COT.
Calcium oxalate i(CaOx) s encountered as deposits on equipment surfaces, such as paper making, sugar, brewing, and water operations. The sources of COM and COT in sugar milling are primarily calcium hydroxide (added to the juice in the clarification stage), and oxalic acid, which is both present originally in the sugar caneand formed in situ by oxidation of sugar. CaOx forms scale deposits on critical equipment surface such as heat exchangers, boilers, and reverse osmosis membranes.
The focus of the present work is to determine the efficacy of polymers with different molecular structure (e.g., molecular weight, type and amount of comoner, polymerization solvent) as CaOx scale inhibitors. Performance data on polymers for CaOx will be presented and compared with other scales e.g., CaCO3, CaSO4, Ca3(PO4)2. Additionally, information on CaOX crsytal morphology as impacted by inhibitors will be presented.
Presenter Bio:
Zahid Amjad received his MSc in Chemistry from Punjab University, Pakistan and Phd from Glasgow University, Scotland, United Kingdom. He started his professional career as an R & D scientist. During his more than 30 years with avrious companies, he has worked in various fields including water treatment, pharmaceutical, oral acre and home care, and related fields.
Dr. Amjad has presented numerous invited lectures and participated in symposia around the world. He has published more than 160 papers, has contributed to numerous chapters, has edited noine books, and holds 30 US patents. Dr. Amjad has received numerous awards including Association of Water Technologies' Ray Baum Water Tehnologist of the Year Award, NACE Technical Achievement Award. He is a member of several professional organizations and is NACE Fellow. Dr. Amjad currently serves as a visiting professor in the Chemistry Deaprtment, Walsh University, N. Canton, Ohio