烷烃-芳烃-N-甲酰吗啉体系液液平衡

用液液平衡釜测定了等温下正庚烷苯ＮＦＭ、甲基环己烷苯ＮＦＭ、正庚烷甲苯ＮＦＭ和甲基环己烷甲苯ＮＦＭ等４组三元体系的液液平衡数据,用ＮＲＴＬ和ＵＮＩＱＵＡＣ模型进行了关联,求得各三元体系的褶点数据,并对ＮＦＭ溶剂存在下烷烃和芳烃的选择性进行了比较。     

聚二甲基硅氧烷/溶剂体系气液平衡研究

采用气液色谱法测定了聚二甲基硅氧烷（ＰＤＭＳ）和９种溶剂在５８～１８０℃范围内,７个不同温度下无限稀溶剂活度系数和Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数。应用ＵＮＩＦＡＣ和ＵＮＩＦＡＣ－ＦＶ模型对ＰＤＭＳ／烃溶剂体系无限稀溶剂活度系数进行了估算。结果表明,ＵＮＩＦＡＣ－ＦＶ模型能较好地预测ＰＤＭＳ／烃溶剂体系无限稀溶剂活度系数。     

苯-噻吩-DMF体系汽液平衡的研究(Ⅱ)——气相色谱法测定稀溶液的活度系数

根据 Conder 和 Purnell 提出的有限浓度普遍化保留理论,导出了有限稀释活度系数公式,用气相色谱法测定了苯-DMF 和噻吩-DMF 两个二元体系在稀溶液区的汽液平衡数据。用 Margules方程和 Wilson 方程对测得的汽液平衡数据进行了关联,并与平衡釜测定的汽液平衡数据作了比较,征明可在全浓度范围内用 Wilson 方程推算苯-噻吩-DMF 体系的汽液平衡数据。     

UNIFAC基团贡献法预测烃类在N-甲酰吗啉中的相平衡数据

用ＵＮＩＦＡＣ基团贡献法预测了苯及烷烃在Ｎ甲酰吗啉溶剂中的无限稀释活度系数及苯ＮＦＭ的二元汽液平衡数据。为提高预测精度，对ＵＮＩＦＡＣ的交互作用参数进行了改进。     

R 22-R 142b-DMF 体系汽液平衡研究

利用Ｒｏｓｅ－Ｗｉｌｉａｍｓ汽液双循环等压平衡釜测定了二元体系Ｒ１４２ｂ－ＤＭＦ及三元体系Ｒ２２－Ｒ１４２ｂ－ＤＭＦ的汽液平衡数据。并分别用ＵＮＩＦＡＣ模型和ＵＮＩＦＡＣ－ＭＨ８１基团贡献型状态方程作了关联和预测，结果符合得较好。     

双－（p－N，N－二甲氨基苄叉）酮／二苯基碘鎓盐复合体系的电子转移光显色

不同的双－（ｐ－Ｎ，Ｎ－二甲氨基苄叉）酮ＤＭＢＫ和二苯基碘盐（ＤＰＩＯＦ）复合，组成一种新型的电子转移光显色体系，ＤＭＢＫ／ＤＰＩＯＦ复合体系在暗处有良好的热稳定性。在光作用下很快发生从激发态ＤＭＢＫ至ＤＰＩＯＦ的电子转移，并伴随ＤＭＢＫ染料的褪色，测得ＤＭＢＫ光褪色速度的次序为：ＤＭＢＡ＞ＤＭＢＰ＞ＤＭＢＨ。与此同时，电子转移又引起新的光显色反应，对ＤＭＢＡ化合物，在７００ｎｍ处出现新吸收峰。其光密度随光照时间而增长，然而，ＤＭＢＰ和ＤＭＢＨ体系这种光显色现象并未观察到，这可能由于它们的中间产物不能共平面的缘故，ＤＭＢＡ的光显色速度和最大密度明显取决于浓度和溶剂性质。本文对这种短波区光褪色和长波区光显色的光化学反应过程作了讨论。     

苯-烷烃-NMP体系汽液平衡

用改进的Ｒｏｓｅ釜测定了１０１３ｋＰａ下苯烷烃ＮＭＰ体系的汽液平衡数据，对所测二元体系ＶＬＥ数据进行了热力学一致性积分和微分检验，用ＮＲＴＬ和ＵＮＩＱＵＡＣ方程进行关联，并用ＮＲＴＬ和ＵＮＩＱＵＡＣ方程的配偶参数推算出三元体系ＶＬＥ数据，与实测值比较，吻合良好。     

甲醇－水、甲缩醛－甲醇和甲缩醛－水系统的汽液平衡

用泵式沸点仪测定了常压下甲醇－水、甲缩醛－甲醇、甲缩醛－水三个二元系在不同液相组成时的沸点，并用间接法由ＴＰｘ推算了与之平衡的汽相组成。用最小二乘法求出了三个二元系的液相活度系数模型参数，由模型参数推算的三个二元系的泡点与实验值能很好的吻合。     

p－（N，N－二甲氨基）肉桂酸乙酯在分子聚集体中的光化学行为

本文报道了ｐ－（Ｎ，Ｎ－二甲氨基）肉桂酸乙酯（ＤＭＡＣ）在十二酸（ＬＡ）聚集体中的光谱和光化学性质．这种肉桂酸衍生物的吸收和发射光谱表现出典型的分子内电荷转移的特征，在十二酸存在下，观察到ＤＭＡＣ激基缔合物荧光，荧光强度随ＤＭＡＣ浓度增加而增加，与普通溶液中的反应相比，十二酸聚集体中的ＤＭＡＣ具有较大的光二聚反应速度．用荧光光谱跟踪反应的结果表明，ＤＭＡＣ激基缔合物具有较ＤＭＡＣ单体更高的光化学活性。     

含水DMF溶剂对苯和噻吩相对挥发度的影响

含水ＤＭＦ溶剂对苯和噻吩相对挥发度的影响刘兵，郑英峨，赵维彭（南京化工大学，化学工程系）关键词苯；噻吩；相对挥发度；汽液平衡（ＶＬＥ）；萃取精馏１前言我国焦化苯所占比重较大［１］，焦化苯中硫化物（主要以噻吩形式存在）等杂质的含量普遍较高，限制了高质量...     

正庚烷-DMF二元汽液平衡和液液平衡数据的测定及关联

采用改进的Rose-Williams釜,在101kPa下,测定了正庚烷-DMF二元体系的VLE数据。并用改进的液液平衡釜在常压下,测定了该二元体系(从293.2到341.2K)的LLE数据。应用NRTL和UNIQUAC两种模型关联了所测体系的相平衡数据,结果是令人满意的。     

闭式循环柴油机旋转床吸收器气体压降模型

分析了闭式循环柴油机(CCD)旋转床CO2吸收器内气液流动特点,建立了流经碟片填料旋转床吸收器气体压降计算模型。通过实验及编程计算,得到了气体压降数学模型中实验关联系数值。经不同工况下气体压力降模型计算值与实验值对比,表明两者相对误差小于15%,可用于实际CCD系统旋转床CO2吸收器的优化设计。     

Measurement of VLE data for propane+1,1-difluoroethane at various temperatures from 268.15 to 333.15 K

Isothermal vapor-liquid equilibrium data for the binary systems of propane (R-290) (1)+1,1-difluoroethane (HFC-152a) (2) were measured at eight temperatures of (268.15, 273.15, 283.15, 293.15, 303.15, 313.15, 323.15 and 333.15 K), respectively. The experiments were performed with a circulation-type equilibrium apparatus to measure temperature, pressure, and the compositions of the liquid and vapor phases. The experimental data were correlated with the Peng-Robinson equation of state (PR-EoS) using the Wong-Sandler mixing rules and the Carnahan-Starling-DeSantis equation of state (CSD EoS). Calculated results showed good agreement with experimental data. It was found that this system has very strong positive azeotropes for all the temperature ranges studied here. This article is dedicated to Professor Chul Soo Lee in commemoration of his retirement from Department of Chemical and Biological Engineering of Korea University.     

丙酮-乙酸异丙烯酯二元体系常压汽液平衡

用改进的埃利斯(Ellis)平衡蒸馏器测定了丙酮-乙酸异丙烯酯二元系统在常压下的汽液平衡数据,用液相活度模型Wilson、NRTL方程对测定数据进行关联,采用非线性最小二乘法回归出二元系统在常压下的Wilson、NRTL方程参数,Wilson模型与试验值符合良好.汽液相平衡数据经Herrington面积法检验满足热力学一致性.     

Modeling the curing kinetics for a modified bismaleimide resin using isothermal DSC

The kinetics of curing for a modified bismaleimide (BMI) resin was investigated to ascertain a suitable cure model for the material. The resin system used in this study was composed of 4,4′‐bismaleimidodiphenylmethane (BMIM) and 0,0′‐diallyl bisphenol A (DABPA, DABA). The BMIM was the base monomer and the DABPA was the modified agent. A series of isothermal DSC runs provided information about the kinetics of cure in the temperature range 170–220°C. Regardless of the different temperatures, the shape of the conversion curves was similar, and this modified BMI resin system underwent an nth‐order cure reaction. Kinetic parameters of this BMI resin system, including the reaction model, activation energy, and frequency factor, were calculated. From the experimental data, it was found that the cure kinetics of this resin system can be characterized by a first‐order kinetic model. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3338–3342, 2004     

Dispersed-phase holdup and mass transfer in a rotating disc contactor with perforated skirts

Dispersed-phase holdup and extraction efficiency were measured in a pilot-plant scale rotating disc contactor (RDC) with perforated skirts (RDCS) with kerosene-o-cresol-water system. The data for the RDCS were examined using the data in this work and the available correlations proposed for the plain RDC. A comparison between the data measured in the RDCS and those in the RDC indicated that the RDCS has rather better extraction efficiency compared with the RDC.     

Isothermal and nonisothermal cure kinetics of an epoxy/poly(oxypropylene)diamine/octadecylammonium modified montmorillonite system

The effect of an octadecylammonium‐exchanged montmorillonite on the curing kinetics of a thermoset system based on a bisphenol A epoxy resin and a poly(oxypropylene)diamine curing agent were studied with differential scanning calorimetry (DSC) in isothermal and dynamic (constant‐heating‐rate) conditions. Montmorillonite and the prepared composites were characterized by X‐ray diffraction analysis and simultaneous DSC and thermogravimetric analysis. The analysis of the DSC data indicated that the intercalated octadecylammonium cations catalyzed the epoxy–amine polymerization. A kinetic model, arising from an autocatalyzed reaction mechanism, was applied to the DSC data. Fairly good agreement between the experimental data and the modeling data was obtained. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1765–1771, 2006     

Determination and correlation of VLE data for methanol and trimethoxymethane system at 101.3 kPa

采用双循环汽液平衡釜测定了101.3 kPa下甲醇-原甲酸三甲酯二元体系在337～372 K的等压汽液平衡数据。实验数据经Herington面积积分法检验,满足热力学一致性。分别采用Wilson、NRTL、UNIQUAC活度系数模型对实验数据进行关联,得到了模型参数。并对汽液平衡的计算值与实验值进行比较,两者吻合良好,其中由Wilson方程关联得到的数据与实验数据偏差最小,平均温度偏差和汽相组成偏差分别为0.57 K和0.0092。本工作为工程设计提供了基础数据。     

磁场处理乙醇-水二元物系精馏分离研究

研究了磁场处理后乙醇 水二元物系汽液平衡数据的变化情况 ,系统进行了磁化乙醇 水二元物系的精馏实验研究 ,重点考察了磁化精馏效果。 0 .48T磁感应强度下 ,采用不同磁化方法 ,其精馏实验值均出现正效应 ,静置磁化效果最好。建立了磁场作用下热力学模型和预测馏出液组成的经验方程