COBEM99

S4 Ciências e Engenharia do Petróleo

Title:

AGGREGATION OF ASPHALTENES AND DEVELOPMENT OF INHIBITORS AND DISPERSANTS IN BRAZILIAN CRUDE OILS

Summary :

THE BEHAVIOR OF TWO ASPHALTENES (C7I - INSOLUBLES IN N-HEPTANE AND C5I - INSOLUBLES IN N-PENTANE), OBTAINED FROM SAMPLES OF BRAZILIAN CRUDE OILS, IN AROMATICS SOLVENTS WAS INVESTIGATED USING FROM SURFACE/INTERFACIAL TENSION DATA. THE EXPERIMENTS WERE CARRIED OUT AT 25OC USING AN AUTOMATIC TENSIOMETER AND EMPLOYING DU NOÜY RING METHOD. THE RESULTS INDICATED THE PRESENCE OF A CRITICAL MICELLE CONCENTRATION IN THE RANGE OF 4.0 E 16.0 G/L. KINEMATIC VISCOSITY MEASUREMENTS HAS INDICATED STILL ANOTHER AGGREGATION AT HIGHER ASPHALTENE CONCENTRATION. THE EFFECTS OF SOME SURFACTANTS, AND COPOLYMERS ON THE PRECIPITATION OF ASPHALTENES, IN CRUDE OILS, WERE INVESTIGATED USING OPTICAL MICROSCOPY FOR THE DETERMINATION OF THE ONSET OF PRECIPITATION INDUCED BY THE ADDITION OF N-HEPTANE TO THE OIL/INHIBITOR SYSTEM. POSITIVES RESULTS WERE FOUND WITH LOW MOLECULAR WEIGHT NONYLPHENOLETHOXYLATED (RENEX) AND ETHOXYLATED ALCOHOLS. THE DISPERSANT EFFECTS OF THE SAME INHIBITORS WERE ALSO INVESTIGATED WITH THE BEST RESULTS OBTAINED USING DODECYLBENZENESULFONIC ACID.

Author :

Loh, Watson 0
Mohamed, Rahoma Sadeg
Ramos, Antonio Carlos da Silva

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