响应面法优化老化油破乳脱水工艺条件及油水界面的分子动力学模拟  

Optimization of process conditions for demulsidication and dehydration of aged oil by response surface method and molecular dynamics simulation of oil-water interface

作　　者：薛云利[1] 崔昌峰[1] 王建[1] 石世珍 许建华[1] XUE Yunli;CUI Changfeng;WANG Jian;SHI Shizhen;XU Jianhua(Shengli Oil Production Plant,Sinopec Shengli Oilfield Company,Dongying 257051,China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司胜利采油厂,山东东营257051

出　　处：《化工环保》2024年第1期80-86,共7页Environmental Protection of Chemical Industry

摘　　要：采用不同相对溶解常数的破乳剂对某油田老化油进行破乳脱水,考察了破乳剂种类和用量、助剂种类和用量、温度等因素对脱水率的影响,利用响应面法优化了工艺条件,并通过分子动力学模拟分析了破乳剂对油水界面的作用机制。在单因素实验的基础上,通过响应面法得到老化油破乳脱水的最优工艺条件为破乳剂C用量130 mg/L、温度75℃、助剂NaOH用量0.3%(w),该条件下老化油脱水率达86.57%。主要工艺参数对脱水率的影响从大到小依次为温度、破乳剂用量、助剂用量。分子动力学模拟结果表明,相对溶解常数最大的破乳剂C与老化油体系的界面生成能最高,在油水界面上的扩散系数最大,对老化油的破乳脱水效果最佳。Demulsifiers with different relative dissolution constants were used for demulsification and dehydration of aging oil in an oilfield.The effects of demulsifier type and amount,auxiliary type and amount,temperature and other factors on the dehydration rate were investigated.The process conditions were optimized using response surface method,and the mechanism of demulsifier on oil-water interface was analyzed by molecular dynamics simulation.On the basis of single factor experiments,the optimal process conditions for demulsification and dehydration of aging oil obtained by response surface method are as follows:demulsifier C amount 130 mg/L,temperature 75℃,auxiliary NaOH amount 0.3%(w).Under these conditions,the dehydration rate of aging oil reaches 86.57%.The main process parameters that affect the dehydration rate in descending order are temperature,demulsifier amount,and auxiliary amount.The results of molecular dynamics simulation show that the demulsifier C with the highest relative dissolution constant has the highest interface formation energy and the largest diffusion coefficient at the oil-water interface,and has the best demulsification and dehydration effect on aging oil.

关 键 词：老化油 破乳剂 响应面法 工艺优化 分子动力学模拟 

分 类 号：X741[环境科学与工程—环境工程]