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《Environmental Science & Technology》 2010-12
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Formation and Demulsification of Emulsion during Processing of Sour and Acidic Crude Oil in Refinery

LAN Jian-yi,YANG Jing-yi,XU Xin-ru(Petroleum Processing Institute,East China University of Science and Technology,Shanghai 200237,China)  
The formation and demulsification of oil-in-water emulsion during processing of crude oil which contains sulfur and acid in refinery were studied. IR and H-NMR results indicated that there are petroleum acid,phenol and sulphide in the emulsion. The emulsification degree for oil-contaminated water is ranked as lauric acid sodium,orthocresol sodium and thiophene,with emulsive competence of fatty acid higher than naphthenic acid in petroleum acid,and much higher with length increase of carbon chain of fatty acid. The existence of corrosion inhibitor has not reduced the efficiency of demulsifier. Demulsifiers of Y series are better than others,and efficiency of demulsification enhanced when YZM and XYY are mixed. When dosage of demulsifiers is 10mg/L,oil concentrations in water phase are respectively decreased from 10,050mg/L to 285.2mg/L and from 2,100mg/L to 97.23mg/L with settling of 20min at 40℃,and oil removal rates are 97.2% and 95.4% respectively.
【CateGory Index】: X741
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