Evaluation of the uncertainties associated to the determination of the Hildebrand solubility parameter of crude oils

Quimica nova

Santos, Maria de Fátima Pereira dos¹  Zilio, Evaldo López²  Ramos, Antonio Carlos da Silva³  Moura, Lyzette Gonçalves Moraes de³  Rolemberg, Marlus Pinheiro³ 

[1] Centro Universitário Norte do Espírito Santo, São Mateus, Brasil;Petróleo Brasileiro S.A., Rio de Janeiro, Brasil;Universidade Federal do Maranhão, São Luís, Brasil

关键词: asphaltenes;    Hildebrand solubility parameter;    uncertainty propagation.;   

DOI  :  10.1590/S0100-40422011000200011

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Asphaltenes arefractions of crude oils that can precipitate and one of the parameters usedin the prediction of the conditions in which this phenomenon occurs is the Hildebrandsolubility parameter. In this work, it was evaluated the uncertainty propagationin the experimental determination of the solubility parameter of different crudeoils, calculated from data of the asphaltenes precipitation by the additionof n-heptane, identified by optical microscopy. It was verified that the solubilityparameter of an oil and the associated uncertainty are specific, being recommendedthat, whenever viable, it is determined parallel both, conferring higher credibilityto the results.

【 授权许可】

CC BY