T
he amphoteric polyacrylamide (PAM) produced by our Company under the trade name of LHPAM, is made from acrylic cationic monomer, acrylamide monomer and a hydrolyzing agent through a copolymerization process. Through infra-red sqectrum analysis, it is shown that the molecular chain of the product has not only carboxyl anionic charges resultion from the hydrolysis of acrylamide, but also cationic charges from the acrylic monomer. Thus, it is an amphoteric random polymer with both positive and negative charges on its molecule.

Type and Characteristics of Non-Ionic Polymers

Tradename
Molecular Weightx106
Cationicity
(%)
Anionicity
(%)
Solids Content(%)
Residual Monomer(%)
Applicable pH
Appearance
LHPAM-1
4-6
5
8-12
90
0.03
1-14
White Powder
LHPAM-2
3-4
20
15
90
0.03
1-14
White Powder
LHPAM-3
1-2
30
15
90
0.03
1-14
White Powder

Note: LHPAM series products have 20-80 mesh grain size. Under room temperature and at a concentration of 0.05-0.1%, it takes about 40 minutes to dissolve in water. The packaging is in 25kg bags. The bag material is double-layered, with an outer layer of woven plastic and an inner sheet plastic layer.

Main Applications:

1. LHPAM-1 is a newly-developed product by our company, specially applicable to profile modification and water blocking in the oilfield. Many filed trials have shown this polymer to have better performance than mono-ionic ones.

2. LHPAM-2 is a brand new flocculant for water treatment. In many cases when treating waste water or raw water, anionic PAM combined with cationic PAM has outstanding synergetic effects over a mono-ionic PAM alone. For example, the ability of LHPAM-2 to lower surface tension is stronger than cationic or anionic PAM alone under the same conditions. Therefore, to reach the required low surface tension, it is usually necessary to use cationic and anionic PAM at the same time. However, if cationic and anionic PAM are not used in the proper way, they will react with each other and precipitate, causing poor performance. LHPAM-2 amphoteric nature creates the compatibility and synergetic effect of anionic and cationic polymers without the risk of precipitation. Particularly, when the water composition is quite complicated, or the composition changes frequently, it is more convenient and effective to use LHPAM-2 as a water treating flocculant.

3. LHPAM-3 as a sludge de-watering agent. Since the composition of municipal waste water is becoming more and more complicated, higher performance is required from sludge dewatering agents. Sometimes cationic PAM is not suitable for certain sludge de-watering applications. For these cases our company has developed a new amphoteric sludge dewatering agent, LHPAM-3. Through numerous sludge de-watering tests on different kinds of sludge, it was shown that LHPAM-3 gave better results then mono-ionic PAM. In particular, our amphoteric PAM gives outstanding results in the de-watering of sludge from refineries and chemical works.

 
 

 


Copyright 2001 © Unitech Asia Pacific Limited
All rights reserved.