DRINKING WATER - SNF Group

10
POLYAMINES
FLOQUAT TM Series
Quaternary polyamines -poly ( 2 hydroxy propyl N,N dimethyl ammonium chloride)- are manufactured
by a ring-opening condensation polymerization of epichlorohydrin and a secondary amine, such
as dimethylamine, at high temperatures in concentrated aqueous solution.
Molecular weights can be varied from 10,000 up to 500,000 by controling the sequence of addition
of the monomers to the reaction vessel. The structure of the resultant polymer differs from the other
polyelectrolytes, so that the cationic charges are situated along the backbone chain, and not as
pendant side groups.
CH 2
O
Industrial polymers produced this way present the following characteristics:
● Molecular weight from 10,000 to 500,000
● Liquid form, active content from 40 to 50 %
● Cationic site on the main chain
● Viscosity, at 50 %, from 40 to 20,000 centipoises
● Chlorine stability
● Compatibility with mineral coagulants
● Long shelf life
CH CH 2 CI + ( CH 3 ) 2 NH
Epichlorohydrin Dimethylamine Polyamine
● Usable with or without preliminary dilution
CH3 I
N + CI
CH2 CH CH2 I I
CH3 OH
-
n