Monitoramento do biossorvente quitosana por ressonância magnética nuclear no domínio do tempo (RMN-DT) em emulsões de petróleo

Abstract

Petrochemical accidents have attracted great notoriety in the scientific community due to environmental damage caused by the spread of oil, both in offshore and onshore environments. The present study carried out petrochemical accident simulations inside a Time Domain Magnetic Resonance (TD-NMR) spectrometer, monitoring the action of the biosorbent on line. The biomaterial chosen was a chitosan, because this material has special features, for example, biodegradability, facility for realizes complexation with metals and flocculation ability that makes possible to study their action as bioremediation agent. The on line results indicated that this biomaterial acts forming complexes with metals present in the emulsioned water. This observation was possible, from relaxometric measurements, where was noted reduction large the 30% about the transverse relaxation time (T2) values. Moreover, experiments were conducted by Eletronic Paramagnetic Resonance Spectrocopy (EPR), this allowed studies about the interaction of this biopolymer with paramagnetic species present in dehydrated oil, where was observed structures very stables, like metalporfirines and possibles desatabilizations of asphaltenes. Thus, studies were conducted with the set of samples of fractions, than allowed to infer, from reduction in T2 values from 1.3 s to 0.3 s corelations with physical chemical properties, for example, density and cut temperature of these samples. Finally, the results about on line accidents simulation, allowed the study of the power of flocculation of petroleum proportioned by chitosan. This prevision was possible, from the set experiments realized, where noted displacement of 20% to major T2 values, making possible to infer about of interaction of this biopolymer with constituents more dense of petroleum and occurence of desestabilization in emulsions , from conduction unpublished experiments of TD-NMR.