共查询到20条相似文献,搜索用时 137 毫秒
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采用双循环汽液平衡釜测定了101.3kPa下碳酸二乙酯-甲苯二元体系的汽液平衡数据。实验数据使用Herington面积积分法检验符合热力学一致性。运用Matlab中的非线性最小二乘法程序,对二元汽液平衡的Wilson和NRTL模型进行参数计算,利用关联出的模型参数计算相应的汽相组成,并与实验值比较,二者符合良好,这为碳酸二乙酯-甲苯体系的热力学研究提供了基础数据。 相似文献
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吗啉-异丙醇二元体系的汽液平衡数据测定及关联 总被引:2,自引:1,他引:1
采用双循环汽液平衡釜测定了吗啉-异丙醇二元体系在常压下的汽液平衡数据。实验数据通过了热力学一致性检验,采用P-T状态方程和Wilson方程关联,获得较满意的结果。 相似文献
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一种新型的汽液平衡釜 总被引:4,自引:0,他引:4
提出了一个气相循环的汽液平衡釜,此釜具有用料少、构造简单、汽液平衡快、测定沸点准确等优点。在10.1235kPa下测定了苯-正庚烷、水-乙醇二元物系,测得数据符合热力学一致性。 相似文献
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采用双循环玻璃汽液平衡釜测定了苯乙烯-环丁砜和邻二甲苯-环丁砜二元体系在15 kPa下的汽液平衡数据。实验结果经Herrington面积法校验符合热力学一致性。分别用Vanlaar、Margules、Wilson、NRTL和UNIQUAC方程作为活度系数模型,对该实验数据进行了关联,采用Prausniz推荐的极大似然估计,利用Nelder-Mead扩展单纯形法回归得到了模型参数,并对关联结果进行了对比,结果表明Wilson方程能较好地重现实验数据,拟合精度较为满意。 相似文献
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乙酸乙酯-乙醇-1-辛基-3-甲基咪唑四氟硼酸盐物系汽液平衡数据的测定 总被引:4,自引:4,他引:0
在101.32 kPa下,用改进的Othmer汽液平衡釜测定了乙酸乙酯-乙醇-1-辛基-3-甲基咪唑四氟硼酸盐([omim]BF_4)三组分物系的等压汽液相平衡数据。采用NRTL方程对实验数据进行了关联,得到方程参数,活度系数的计算值与实验值的偏差为3.12%。实验结果表明,加入[omim]BF_4使汽液平衡线偏离乙酸乙酯-乙醇二组分物系的汽液平衡线,[omim]BF_4含量越大,偏离程度越大;[omim]BF_4具有明显的盐析效应,能够增大乙酸乙酯对乙醇的相对挥发度;当x([omim]BF_4)为10%时,乙酸乙酯-乙醇物系的共沸点消失,随[omim]BF_4含量的增加,乙酸乙酯对乙醇的相对挥发度增加。 相似文献
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在隔壁塔中加入了以科恩达效应为基础的新型气相分配器并以此建模利用Fluent进行多相流模拟。结果显示在加入液相的情况下,新型气相分配器依然遵循科恩达效应。即气相从分配器的细缝喷出带走其周围气相,在分配器下方形成负压,以此实现调控Rv的目的。类比气相分配器的工作原理,在预分馏塔的塔板之间选择一位置引出一定量气相,此相当于分配器喷出的气相。在主塔段输入相同量的气相,此相当于分配器入口处气相。通过改变输入或输出的气速来调节Rv。模拟结果显示,在温度或浓度控制结构的基础上加入此控制机制可以更好地实现气相分配的效果。 相似文献
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For most explosives vapor detection scenarios, the lower detection limit (LDL) requirements are at part-per-trillion (ppt) concentration levels. Further sensitivity constraints are imposed on the detector modules by attendant sampling dilution and inefficient transport of explosives vapor molecules through the detection system sample train. Efficient transport and large preconcentration factors (? 100,000) can be achieved simultaneously by using a liquid sampling module, comprising a wetted-wall column in the sample train. Liquid sampling modules are interfaced most effectively to wet-chemical detectors. The transport and preconcentration processor introduces a 60-s or longer lag to the overall system time rate-of-response depending on the preconcentration requirements. Despite the long delay time of liquid preconcentrators and the relatively slow rate-of-response time and limited sensitivity of wet-chemical vapor detectors, it appears that their use is feasible for some applications. For example, those detectors with a liquid transport and preconcentration sample train can monitor the atmosphere within enclosures such as rooms, buildings, etc. The inlet to the sample can be located at some convenient and effective point, e.g., in the main air conditioning or ventilation duct upstream of the blower. An explosives vapor detection system comprising a liquid sampling module and a wet-chemical detector and their ancillary equipment can be an effective device for some applications. Integration of a liquid sampling module into a system can extend the LDL of an enzymatic bioluminescent TNT detection technique to an equivalent 0.001 ppt gas phase concentration. It is accomplished by the extraordinary sample preparation achieved by a liquid sampling module in the form of efficient sample transport and sample concentration. Currently two liquid sampling modules for vapor detection systems are in development by the U.S. Army. Fort Belvoir is developing Spincon: a batch-type sampling module for an explosives detection system employing an enzymatic bioluminescent technique. The Aberdeen Proving Ground is developing BezeTrog: a continuous liquid sampling module for the detection of hazardous waste gas molecules in the flue streams employing a coloriometric technique. A liquid sampling module is used as an end-line device interfacing directly with the detector. It contributes significantly to the detection system's performance in meeting the very stringent requirements imposed on explosives vapor detection systems. Although a liquid sampling module fits easily into the general scheme of a typical vapor detection network its design and implementation is a major engineering undertaking. 相似文献
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陈新志 《石油学报(石油加工)》1996,12(3):94-99
将经典热力学方法与双流体模型结合,由纯物质的蒸汽压方程,关联了低压下的二元混合物的汽液平衡,只需要一个二元相互作用参数,计算精度与二参数的Wilson方程相当。 相似文献
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Abhijit Y. Dandekar 《Petroleum Science and Technology》2004,22(9):1161-1172
The interfacial tension (IFT) of hydrocarbon fluids is commonly predicted by either the parachor method or the scaling law. The methods require equilibrium liquid and vapor phase composition and density. An equation of state would normally be required if experimental values are not available. However, the computation of density for simple hydrocarbons and reservoir fluids, despite the important advances achieved by cubic equations of state, still remains a weak link in these types of calculations. Thus, there exists a need to investigate the qualitative and quantitative effects, of such inaccuracies in the density, on IFT predictions. Moreover, the study presented in this work would be useful in reservoir engineering and enhanced oil recovery calculations. The results presented in this work indicate that the methods are highly sensitive to the inaccuracies in the density of both the liquid and the vapor phases. An error of around 10% in the liquid or the vapor density can result in an error of up to 200% in the estimated IFT. Two binary and one ternary mixture for which measured data on IFT, composition and density is reported in the literature form the basis of this study. 相似文献
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天然气中常含有少量CO2气体。文章介绍低温下小分子量烃类混合物中CO2饱和浓度的理论计算方法,在计算过程中运用了能够准确反映气液相平衡的热力学状态方程。对于其它溶解物,只要可以准确得出固-气相平衡压力关系,该方法仍可实用。最后,将运用本方法所得计算结果与一些已有实验结果进行了比较,证明本方法用于LNG、LPG可以得到很好的结果。 相似文献