甲基戊烯酮脱酚体系液液相平衡与工程应用研究

发布时间：2018-10-08 11:04

【摘要】：煤炭的清洁利用对我国经济发展和能源安全具有重要作用,煤气化是煤炭清洁利用的主要方式之一。在煤气化的生产过程中,有大量的含酚废水产生,会对环境造成较大危害。酚萃取可以降低废水的污染负荷,同时可以回收废水中的酚类污染物。开发高效、低成本的萃取剂,对于兼顾经济效益与环境保护具有重要意义。本研究对甲基戊烯酮用作脱酚萃取剂的相平衡关系及工程化应用进行了研究。首先,本文对以甲基戊烯酮为萃取剂处理含酚废水的液液相平衡关系进行了研究。借助气质联用仪,以Agilent 6890N/5973MSD为工作站,选取Agilent HP-INNOWax作为色谱柱测定了25、40和50℃下甲基戊烯酮—水—苯酚三元体系和40℃下甲基戊烯酮—水—苯酚—间甲酚四元体系的液液相平衡数据,并绘制成相图。对三、四元体系分配系数和选择性系数进行分析。然后采用NRTL活度系数模型对三、四元体系液液相平衡数据进行数据回归,并通过选择合适的αij值,得到了三、四元体系各物质间的二元相互作用参数。利用实验值与计算值之间的相对均方根误差(RMS E)对拟合效果进行评价,结果显示在实验温度范围内三元体系相对均方根误差(RMSE)小于2%,四元体系相对均方根误差(RMSE)小于3%,表明NRTL模型能很好地描述上述三,四元体系液液相平衡关系。获得的二元相互作用参数可用于多元体系相行为的预测,同时也为工厂流程模拟计算提供了设计依据,为进一步为甲基戊烯酮作为萃取剂的应用从理论上和实践上分析奠定了基础。最后,借助Aspen Plus模拟软件,采用得到的相平衡关系,对以甲基戊烯酮为萃取剂的酚萃取工艺流程进行了概念化设计。经过灵敏度分析,对该流程工艺参数进行了优化,确定了较优的工艺参数,从而为甲基戊烯酮作为酚萃取剂工业化应用提供依据
[Abstract]:The clean utilization of coal plays an important role in the economic development and energy security of our country. Coal gasification is one of the main ways of clean utilization of coal. In the process of coal gasification, a large amount of phenol-containing wastewater is produced, which will cause great harm to the environment. Phenol extraction can reduce the pollution load of wastewater and recover phenolic pollutants from wastewater. The development of high efficiency and low cost extractant is of great significance for both economic benefits and environmental protection. The phase equilibrium relationship of methyl pentenone as extractant and its engineering application were studied. Firstly, the liquid-liquid equilibrium relationship of phenolic wastewater treated with methyl pentenone as extractant was studied. With the help of GC-MS, with Agilent 6890N/5973MSD as the workstation, The liquid-liquid equilibrium data of methyl pentenone-water-phenol ternary system and methyl pentenone-water-phenol ternary system at 40 鈩，

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