RESUMO
Rhodococcus sp. PR-1 with high capability of demulsification on a surfactant-stabilized kerosene-water model emulsion was isolated from sewage of Dagang oil field. It could demulsify the model emulsion completely in 8 hours at 55 degrees C and had better demulsifying capability than chemical demulsifier DGF-01. The freezing-thawing and autoclaving had no effect on the process of demulsification, yet ultrasonic disposal and deal with organic solvent could inhibit its activity. A linear relationship, not the first order reaction that was used in some references, was observed between the percentage of demulsification and reaction time. The demulsifying capability of PR-1 was mainly resulted from the hydrophobic surfaces of microbial cells, which were characterized by the mycolic acids with the carbon-chain-length from 27 to 54. These results provide foundation for biological application on demulsifying crude oil emulsions in produced water of oil field.
Assuntos
Emulsificantes/metabolismo , Petróleo/metabolismo , Rhodococcus/isolamento & purificação , Rhodococcus/metabolismo , Biodegradação Ambiental , Emulsões , Petróleo/microbiologia , Esgotos/microbiologiaRESUMO
To prepare and optimize the gastrodin dispersible tablets by orthogonal design using the disintegration time as index. The quality of gastrodin dispersible tablets was evaluated by the initial stability test. The results showed that the disintegration time of optimized prescription formulation was 106s, i.e. L-HPC and CMS-Na was used by combining exterior and interior and the dissolution percent in vitro was obviously super to the conventional tablets. Moreover, the quality of the dispersible tablets was very well by stability test.