DEVELOPMENT OF FLOCCULANTS USING HEALTHY …DEVELOPMENT OF FLOCCULANTS USING HEALTHY-FRIENDLY...
Transcript of DEVELOPMENT OF FLOCCULANTS USING HEALTHY …DEVELOPMENT OF FLOCCULANTS USING HEALTHY-FRIENDLY...
DEVELOPMENT OF FLOCCULANTS USING HEALTHY-FRIENDLY PROCESSES
A. Lourenço 1,2, J. Arnold 2 and M. G. Rasteiro 1,*
1 Chemical Engineering Department, University of Coimbra, Rua Sílvio Lima, 3030-790 Coimbra, Portugal.2 Aqua+Tech Specialities SA, 1237 Avully, Geneva, Switzerland.
[email protected], [email protected]*
The main objective of this work is the development of new flocculants medium using healthy-friendly ingredients in their synthesis. A new polymerization
medium has been tested with a well-known copolymer for water treatment formulations, consisting of cationic quaternary ammonium and acrylamide
monomers. As these polymers are produced in inverse-emulsion, alternative continuous phases can be employed including purified mixtures of liquid saturated
hydrocarbons, with higher boiling point. Those are of high purity due to their manufacturing process being free of the toxic polycyclic aromatics and heavy metals.
Polyacrylamide-co-dimethylaminoethyl acrylate (AAm_AETAC) was synthesized with three different oils and three different polymer compositions, in order to
evaluate if it is possible to produce copolymers with controlled properties and different charge densities using the previous mentioned healthy-friendly oils. The
results showed that these oils are suitable to produce copolymers with high molecular weight and having different charge densities, keeping the emulsion
stability unchanged. In addition, a further step could be achieved by partially replacing the ethoxylated surfactant.
ACKNOWLEDGEMENTSThe authors would like to thank for financial support from Marie Curie Actions – European Industrial Doctorate (EID), through Grant agreement FP7-PEOPLE-2013-ITN-604825, and from Portuguese Foundation for Science and Technology (Pest/C/EQB/UI0102/2013). Also, to Dr. David Hunkeler and Aqua+Tech Specialities SA (Switzerland).REFERENCESM. G. Rasteiro, F. A. P. Garcia, P. J. Ferreira, E. Antunes, D. Hunkeler and C. Wandrey, J. Appl. Polym. Sci. 2010, 116, p. 3603–3612.J. Hernandez Barajas, C. Wandrey and D. Hunkeler, U.S. Pat. 6,667,374 B1 (2003).
• The chosen healthy-friendly oils are suitable to produce copolymers with high molecular weight and different charge densities, in stable emulsions,without affecting the final target viscosity by the use of a different organic phase and surfactants combination.
• These processes have good possibilities to work successfully when applied with new co- and ter-polymers developed to treat wastewaters.
INVERSE-EMULSION POLYMERIZATION
CONCLUSIONS
2nd EuCheMS Congress on Green and Sustainable Chemistry
Conditions
Monomers concentration 40 wt%
Surfactants Sorbitan isostearate
PEG-7 Hydrogenated Castor oil
HLB
4.75 (Puresyn 4)
5.50 (Carnation)
4.75 (Marcol 82)
Initial temperature 25-30 oC
Initiator Redox couple: Tert-butyl hydroperoxide/ Meta bisulfite
Organic phases
• Puresyn 4
• Carnation
• Marcol 82
Copolymers
• 60%AAm_40%AETAC
• 40%AAm_60%AETAC
• 20%AAm_80%AETAC
Acrylamide (AAm)
2-(Dimethylamino)ethyl acrylate(AETAC)
EVALUATION OF PERFORMANCE USING SLUDGE
Reference
MEASUREMENT OF VISCOSITY
The polymer viscosity wasmeasured using a 0.5 wt% ofactive polymer solution witha model LVDVII þ viscometer(Brookfield, Stoughton, MA,USA) at 30 rpm and 24-25 oCtemperature.
ƞ (mPa.s)
Puresyn4_60%AAm_40%AETAC 1093
Carnation_60%AAm_40%AETAC 1130
Marcol82_60%AAm_40%AETAC 1003
ƞ (mPa.s)
Puresyn4_40%AAm_60%AETAC 1200
Carnation_40%AAm_60%AETAC 1210
Marcol82_40%AAm_60%AETAC 1313
ƞ (mPa.s)
Puresyn4_20%AAm_80%AETAC 1333
Carnation_20%AAm_80%AETAC 1103
Marcol82_20%AAm_80%AETAC 1030