Page 267 - Fundamentals of Water Treatment Unit Processes : Physical, Chemical, and Biological

222 Fundamentals of Water Treatment Unit Processes: Physical, Chemical, and Biological

TABLE 9.10
Cationic Polymer Structures and Characteristics
Polymer Data
n – 131 Manufacturers, 1216 products a
Commercial example: Catfloc T b
CH 2
Molecular weight: 0.5 10 6
CH CH CH 2
Charge density: 6 meq=g active polymer c
H 2 C CH 2
+N
n
CH 3 CH 2
(a) Polydiallyldimethylammonium (PDADMAC)
4
Molecular weight: 10 –10 5c
CH 2 CH CH 2 CH CH CH 2 Charge density: 8 meq=g active polymer d
C O CH 2 CH 2

NH 2 N +
x H C CH 3 y
3
(b) Acrylamide-DADMAC
104 Manufacturers, 749 products a
CH CH 2 NH CH 2 CH 2 N Molecular weight: 15 10 6
H 2 NCH 2 CH 2 2
x y z Charge density: high
Primary amine Secondary amine Tertiary amine
(c) Polyamines
a
131 Manufacturers, 1216 products
OH
CH 3 5
MW 0.67 10
Charge density 7.95 meq=g solid
CH d
CH 2 CH 2 N Commercial example: Magnifloc 572C
+
MW ¼ 63,000 g=mol
CH 3 Charge density: 3.1 meq=g neat at pH ¼ 7.0
n
American Cyanamid e
(d) epi=DMA polyquaternary amine f
CH 2 CH
C O
NH

CH 2

+
H C N CH 3
3
CH 3 n
(e) Mannich
a
National Sanitation Foundation, www.NSF.com, November 27, 2000.
b
Luttinger (1981).
c
Edzwald (1993, p. 27).
d
Hubel and Edzwald (1987, p. 99).
e
Dentel and Gucciardi (1989, p. 25, Table 2).
f
Edzwald (1985, p. 172).