间苯二酚溶剂萃取液液相平衡数据的关联

用NRTL模型对实验测定的24℃、101.33 kPa下醋酸正丁酯-间苯二酚-盐水及正丁醇-间苯二酚-盐水拟三元体系的液液相平衡数据进行了关联,分别得出了醋酸正丁酯-间苯二酚-盐水及正丁醇-间苯二酚-盐水拟三元体系的模型参数,并运用模型对体系相平衡进行了预测.将实验数据与关联结果比较,结果表明:NRTL模型能较好地对以...     

间苯二酚溶剂萃取液液相平衡研究

测定了“醋酸正丁酯-间苯二酚(溶质)-盐水(含0.2质量分率NaCl)”三元系在24℃、101.33kPa下的液液相平衡数据并给出了三角相图,用Hand公式对相平衡数据进行了关联,获得了可供工业连续萃取过程设计使用的关联式。本研究将醋酸正丁酯和正丁醇作为溶剂萃取间苯二酚进行了对比,并指出:醋酸正丁酯优于正丁醇。     

丁酮肟-水-异辛醇物系液液相平衡的研究

在甲基三丁酮肟基硅烷的生产过程中会产生部分含丁酮肟的废水,用萃取方法可回收丁酮肟。为获得萃取工艺所需的基础数据,在常压、60℃温度下,以工业实际废水为物料,进行液液相平衡实验,用拟三元方法处理丁酮肟-水-异辛醇三元体系的液液相平衡数据,获得了三元体系平衡相图。实验数据用非随机两相液体(NRTL)模型进行了关联,得出了该三元体系的NRTL模型参数。将实验数据与关联结果进行比较,结果表明,NRTL模型能对该三元体系进行较准确的关联。     

苯-噻吩-二甲基亚砜体系等压汽液相平衡研究

采用汽液双循环相平衡仪测定了101.33 k Pa下苯-噻吩、苯-二甲基亚砜及苯-噻吩-二甲基亚砜的等压汽液相平衡数据。两组二元体系实验数据均通过了Herington面积法的热力学一致性检验,分别采用NRTL和UNIQUAC活度系数模型对二元体系实验数据进行热力学关联,得到了相应的模型参数,温度偏差和汽相组成偏差,关联结果表明两种模型均能较好的关联实验数据,其中UNIQUAC模型的关联结果稍优于NRTL。利用二元体系UNIQUAC模型参数预测三元体系汽液平衡数据,预测值与实验值相比,平均温度偏差1.37 K,汽相各组分平均绝对偏差均在3%以内,获得了较优的预测结果,从而为工业上苯-噻吩萃取精馏分离过程提供可靠的热力学基础数据。     

丁酮-水-丙三醇三元体系液液平衡数据的测定与关联

为了给以丙三醇为溶剂萃取分离丁酮-水体系的过程设计和流程模拟计算提供基础数据,在常压,20,40,60℃下,测定了丁酮-水-丙三醇三元体系的液液平衡数据,得到了三元体系的共轭相组成并由此绘得相平衡曲线。实验数据用UNIQUAC和NRTL模型进行了关联,利用关联出的模型参数计算了相应的液相组成,并与实验值比较,其平均偏差小于0.003 8,计算值与实验数据吻合良好。求得了溶剂对溶质的选择性系数,验证了丙三醇是液液萃取分离丁酮-水的良好溶剂。     

水-仲丁醇-乙酸仲丁酯三元体系的液液相平衡研究

测定了水-仲丁醇-乙酸仲丁酯三元体系在303.15,323.15,343.15,353.15 K下的液液相平衡数据,并用NRTL模型和UNIQUAC模型对相平衡数据进行关联,应用单纯形法求得相应的模型参数。计算值与实验值比较结果表明:NRTL模型与UNIQUAC模型的计算值与实验数据吻合良好。     

乙腈-水-氟化钾及乙腈-水-碳酸钾液液相平衡数据的测定和关联

引　言乙腈 -水构成恒沸体系[1] ,目前国内外多采用恒沸精馏生产乙腈或加盐分离乙腈 -水体系 .乙腈 -水 -氟化钾及乙腈 -水 -碳酸钾体系的液液相平衡数据的测定和关联还未见报道 .氟化钾或碳酸钾很容易破坏恒沸物 ,使其分离易于进行 .将氟化钾或碳酸钾加入乙腈 -水体系时 ,由于氟化钾、碳酸钾的盐析效应 ,使得乙腈 -水体系形成的两相中乙腈相中含有少量水和极少量盐 ,盐水相中含有极少量乙腈 ,使大部分水在盐水相中脱去 ,得到很高的分离因子 .本文实测了乙腈 -水 -氟化钾及乙腈-水 -碳酸钾体系在 2 5℃时的液液相平衡数据 ,用Ｐｉｔｚｅｒ理…     

水-乙醇-甲基异丁基甲酮体系液液相平衡数据的测定与关联

在常压下测定了水-乙醇-甲基异丁基甲酮体系在308.15,318.15,328.15 K的液液相平衡数据。用Hand方程和Othmer-Tobias方程对实验数据进行拟合,结果表明:Hand方程拟合效果优于Othmer-Tobias方程。采用NRTL模型和UNIQUAC模型对实验数据进行了关联,回归得到了该三元物系的二元交互参数;并对此物系的相平衡数据进行了预测,由模型计算值和实验值的均方根偏差知,NRTL模型能更好地与实验数据吻合。     

水-醋酸-醋酸正丁酯三元体系液液平衡研究

文章用液液平衡装置在常压下,测定了水．醋酸-醋酸正丁酯三元体系40℃的液液相平衡数据。运用Othmer-Tobias方法对系线组成进行关联。由实验数据回归确定了NRTL、UNIQUAC以及修正的UNIFAC活度系数模型参数,并运用这些模型对体系相平衡进行了预测。将实验数据与关联结果比较,结果表明,三种方程均能较好地对溶液组成进行预测,其中UNIQUAC方程的拟合精度最好。     

N,N-二甲基甲酰胺-三氯甲烷-水体系液液相平衡数据的测定与关联

为获得进一步研究DMF废水萃取回收工艺所需的基础数据,利用液液平衡釜在常压下温度分别为30℃、35℃、40℃时进行N,N二甲基甲酰胺-三氯甲烷-水体系的液液相平衡实验,各物质的平衡组成由气相色谱分析,所得液液相平衡数据用NRTL和UNIQUAC模型进行关联,应用单纯形法求得相应的模型参数.计算值与实验值比较结果表明:NRTL与UNIQUAC模型的计算值与实验数据吻合良好,模型计算的总平均绝对误差分别为0.0032和0.0033,总平均相对误差分别为2.60%和2.97%.     

Liquid+liquid equilibria of ternary water+carboxylic acid+solvent systems at 288.15 K

The experimental liquid-liquid equilibrium (LLE) data for six ternary systems containing (chloroform+propionic acid+water), (chloroform+acetic acid+water), (diethyl ether+propionic acid+water), (diethyl ether+acetic acid+water), (trichloroethylene+propionic acid+water) and (trichloroethylene+acetic acid+water) were measured at 288.15 K and at atmospheric pressure. An accurate and simple titration method was used for determining of the concentration of carboxylic acid in the both liquid phases at equilibrium. The reliability of the experimental tie-line data was confirmed by using the Othmer-Tobias correlation. The distribution coefficients and selectivity factors were presented to evaluate the efficiency of the solvents for extraction of carboxylic acid from water. The results show that chloroform and diethyl ether are satisfactory solvents for extraction of carboxylic acids from water. Trichloroethylene separates propionic acid from water; however, it cannot be used as a solvent for separation of acetic acid.     

水-异丙醚-对苯二酚液-液-固等温平衡数据的实验测定

用气相色谱仪测定了常压下水-二异丙基醚-对苯二酚在50℃和46℃的两个等温平衡数据.这两个等温截面的特点是:存在单相液体与对苯二酚固体的平衡区域,同时存在液相分层的广阔的两相共存区域.实验表明,等温截面上没有液-液-固三相共存点.实验数据包括对苯二酚的饱和溶解度数据和两液相共存数据.二异丙基醚萃取水中对苯二酚的饱和分配系数仅为0.7～1.3,远小于二异丙基醚萃取水中苯酚的分配系数.结论是:等温下用二异丙基醚萃取水中对苯二酚并不很有效.     

水＋醋酸＋甲基叔丁醚三元体系汽液平衡数据的实验测定及数学模拟

用改进的Rose釜测定了常压下H2O＋HAc＋甲基叔丁醚三元体系部分汽液平衡数据,借助实验数据,利用AspenPlus软件对该三元体系NRTL和UNIQUAC方程的模型参数进行了回归。回归结果反过来用于汽液平衡的数学模拟,结果表明实验数据与模拟结果很吻合,该结果可以为相关研究及工业设计提供帮助。     

氧气在醋酸水溶液中的溶解度估算

将水作为溶剂主体,通过热力学分析导出了氧气在纯水中的溶解度模型。将醋酸作为有机溶剂添加剂,用Stechenov关联式表征了醋酸对氧气在水中的溶解度的影响。模型参数由文献数据回归得到,模型计算得到的溶解度值与文献报导的实验值进行比较吻合良好。建立的氧气在醋酸水溶液中的溶解度机理模型可用于关联和预测不同醋酸浓度下不同温度和压力时氧气在醋酸水溶液中的溶解度。     

溴-浓海水(卤水)体系常压下气液平衡研究

以浓海水(卤水)为原料的空气吹出法制溴素工艺已在国内外广泛使用。本研究采用鼓泡夹带平衡釜测定了常压下,溴-浓海水(卤水)体系在30℃和40℃下的气液平衡数据,并用对称活度系数模型Margules方程对测定数据进行了关联,采用非线性最小二乘法回归出该系统在常压下的方程参数,拟合结果精度较高,误差不超过3.6%。     

Measurement and correlation of the solubility of sodium acetate in eight pure and binary solvents

The knowledge of solubility of a salt in either the pure solvent or blend solvent is of great importance for studying or operating the crystallization, extraction, and distillation processes. The solubility of sodium acetate (NaAc) in four pure solvents (water, ethanol, acetic acid and 2,2,2-trifluoroethanol) and four binary solvents (water–ethanol, water-acetic acid, acetic acid–ethanol, and acetic acid-ethyl acetate) were measured by using the laser dynamic method at temperatures from 288.15 K to 338.15 K at 0.1 MPa. The results showed that the solubility of NaAc was influenced by either the solution temperature or solvent composition. The aqueous sodium acetate solution possessed the maximal solubility under the experimental conditions. The solubility of NaAc in 2,2,2-trifluoroethanol was found to be decreased with the increase of the solution temperature. While, the solubilities of NaAc in other seven solvents increased as the solution temperature was elevated. Besides, five correlation models, including the van't Hoff model, modified Apelblat model, Yaws model, λh model, and modified Apelblat-Jouyban-Acree model were used to correlate the solubility data of those sodium acetate solutions with acceptable deviation, respectively. Finally, van't Hoff analysis method was selected to analyze the change law of thermodynamic properties of a salt during the dissolution process.     

Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water-methanol system

The solubility of ammonium dihydrogen phosphate (MAP) in the water-methanol system is essential for antisolvent crystallization studies. To investigate the effect of methanol on the solubility of MAP in water, the solubility of MAP in the water-methanol system was determined by dynamic method and static equilibrium method at temperatures ranging from 293.2 to 343.2 K at atmospheric pressure. Results showed that the solubility of MAP increased with the increase of temperature and the increase of water mole fraction in the water-methanol system. The experimental solubility data were correlated with the modified Apelblat equation, the combined nearly ideal binary solvent/Redlich-Kister (CNIBS/R-K) model and the Jouyban-Acree model. The calculated results based on these three models were in very good agreement with the experimental data with the average relative deviations of 0.65%, 0.97%, and 5.38%, respectively. Simultaneously, the thermodynamic properties of the MAP dissolution process in the water-methanol system, including Gibbs energy change, enthalpy, and entropy were obtained by the Van't Hoff equation, which can be used to assess the crystallization process.     

LIQUID PARTITIONING OF AMPHIPHILIC SOLUTIONS RELATED TO THE SOLVENT EXTRACTION OF BITUMEN FROM TAR SANDS

The Wood-Beaver process is a solvent extraction process which uses a fatty acid blend (light hydrocarbons, aromatics, and fatty acids) as the solvent and utilizes amphiphilic phase behavior and phase shift to recover the fatty acids from the solvated bitumen. The process consists of mixing the solvated bitumen with an alcohol-water wash which precipitates the bitumen as the bottom phase of the primary settler. The top phase of the settler contains the fatty acid/alcohol/water/light hydrocarbons components. The fatty acid and light hydrocarbons are then recovered in a secondary settler by shifting the phase equilibrium by either over-dosing with water or by driving off alcohol by the application of heat.

This paper presents experimental equilibrium phase behavior data and the correlations resulting from an analysis for the quaternary system of oleic acid, bitumen, isopropyl alcohol, and water. The data are presented in the form of psuedo ternary diagrams. The NRTL modelling equation was applied to the oleic acid/brine/isopropyl alcohol system in order to determine a set of interactive and non-randomness parameters that adequately describe the liquid-liquid phase behavior of this ternary system. The phase envelope and accompanying tie lines reproduced from the model showed acceptable agreement with the experimental data.     

氧气(1)-乙酸(2)-水(3)三元系平衡溶解度的测定及关联

建立了测定气体在液体中溶解度的实验装置,该装置一次进料能够连续测定多种压力下的溶解度数据,并测定了25～80 ℃氧气在乙酸-水混合溶剂中的溶解度数据.建立了氧气在乙酸-水混合缔合溶剂中溶解度的计算模型,给出了模型参数,模型计算平均相对误差不超过±3.0%.     

反式-1，2-环己二醇在乙酸甲酯与水混合溶剂中的溶解度

采用激光监视技术测定了1，2-环己二醇在乙酸甲酯和水混合溶剂中的溶解度，并用UNIFAC模型进行了关联，其溶解度预测值与实测值吻合程度良好。