毕业设计---萘-甲苯、二甲苯溶液的粘度测定与关联.doc

PAGE 毕业设计（论文） 题目名称：萘-甲苯、二甲苯溶液密度和粘度的测定与关联 萘-甲苯、二甲苯溶液的粘度测定与关联 摘要 萘作为精细化工的重要原料，需求非常之大。粘度和密度是化工设计和过程优化中不可缺少的基础物性和热力学数据，在流体流动、动量传递以及设计反应器大小方面至关重要。密度、粘度应用广泛，而萘的物性数据极其缺乏，因此需对其密度、粘度等数据进行测定。根据萘在甲苯以及二甲苯中的溶解度大小和外界温度的大小，本文测定了萘-甲苯，萘-二甲苯两个二元混合体系在293.15K ~ 343.15K，质量摩尔浓度分别在0 ~0.50、0 ~ 0.30mol/kg下的密度和粘度。密度、粘度的测定方法较多，本次毕业设计所研究的混合溶液的密度是用25ml的比重瓶在恒温条件下测定，粘度采用乌氏粘度计测定，恒温水浴的温度波动控制在±0.1K。测出的两个二元体系的密度、粘度随质量摩尔浓度的增加而增加，随温度的增加而降低。计算出了分析密度、粘度与温度、溶液组成间的关系，并Vogel-Tamman- Fulcher(VTF)方程进行关联，得到方程参数及标准偏差ARD、平均相对偏差SD值。 关键词：萘；甲苯；二甲苯；密度；粘度 Abstract Naphthalene as fine chemical and important raw materials, demand is very large.Viscosity and density of chemical process design and optimization of the indispensable is basic for the physical properties and thermodynamic data, in the fluid flow, momentum transfer, as well as the design of reactor size is essential . Density and viscosity have a wide range of applications, and naphthalene data were extremely scarce, so it is necessary to measure its density and viscosity. According to the solubilities of naphthalene in toluene and xylene and the surrounding temperature , In this paper, the densities and viscosities of naphthalene + toluene and naphthalene + xylene mixtures have been measureed in 293.15 K ~ 343.15 K, naphthalene molality, respectively, in 0~0.50,0~0.30 mol/kg. There are many methods for measuring the density and viscosity , in this study ,I have measured the density of mixed solution with 25ml pycnometer capillary temperature conditions in the determination; the viscosity with intrinsic viscosity, constant temperature water bath to control temperature fluctuations ± 0.1 K. For the density and viscosity of the two binary system, I have drawed a conclusion that when the molality increase, the density and viscosity increase ; with the temperature increase, contrarily, the density and viscosity will decrease. Meanwhile I have calculated the relevance among analysis of density, viscosity , temperature and the composition of the so