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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Chemical Engineering and Biochemical Engineering     
Removal of emulsified water in petroleum sludge using micro-emulsion method
YANG Jie, LIU Tian lu, MAO Fei yan, HUANG Qun xing, LIN Bing cheng, CHI Yong
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang Design Institute of Water Conservancy and Hydroelectric Power, Hangzhou 310000, China
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Abstract  

Micro-emulsion method was used in the pretreatment of petroleum sludge before centrifugation in order to improve the removal rate of emulsified water in petroleum sludge,based on the extremely low interfacial tension of micro-emulsion to effectively break down the water-in-oil structure of petroleum emulsion. Differential scanning calorimetry (DSC) was used to deduce the water content of petroleum sludge. Results indicate that the emulsified water can not be settled by centrifugation simply at a speed of 4 000 r/min because of stable emulsification.While, the water content of the upper layer of petroleum sludge sample decreases from 55.83% to 11.76% after adding 5% micro-emulsion. The experiment about effect of different oil phases and cosurfactants on dewatering shows that the maximum dewatering efficiency of 94.60% is achieved by using kerosene as oil phase and n-butanol as cosurfactant. A dewatering efficiency of 95.23% is obtained with the composite surfactant of cetyl trimethyl ammonium bromide (CTAB) and nonylphenol polyoxyethylene ether (NP-10) at a ratio of 1 to 6. It is higher than that by using NP-10 as single surfactant under the same condition, which is 78.94%. The interaction point of NP-10 and CTAB is confirmed through 2D nuclear magnetic resonance NOESY experiment.

Published: 06 March 2017
CLC:  TE 992.3  
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YANG Jie, LIU Tian lu, MAO Fei yan, HUANG Qun xing, LIN Bing cheng, CHI Yong. Removal of emulsified water in petroleum sludge using micro-emulsion method. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(2): 370-377.


微乳液法脱除含油污泥中的乳化水

为了提高含油污泥中乳化水的脱除率,采用微乳液法对进行离心分离前的油泥进行预处理.微乳液具有超低的界面张力,能够破坏油泥的油包水乳化状态,油泥样品的含水率通过差示扫描量热法测得.结果表明,当离心转速为4 000 r/min时,单纯的离心分离不能使稳定乳化的油泥中的乳化水沉降.等添加质量分数为5%的微乳液预处理后,油泥样品离心分离上层的含水率从55.83%降低到11.76%.不同油相和助表面活性剂对脱水效果影响的实验表明,煤油为油相,正丁醇为助表面活性剂时,脱水率最高,可达94.60%.在其他条件相同的情况下,采用十六烷基三甲基溴化铵（CTAB）和壬基酚聚氧乙烯醚（NP-10）按质量比为1∶6复配时的脱水率高达95.23%,高于单独使用NP-10作为表面活性剂时的脱水率78.94%.通过2D核磁 NOESY实验确定了CTAB和NP-10的相互作用点.

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