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71.
72.
在70℃下采用浊点法分别测定了二甲亚砜、N-甲酰吗啉、四甘醇与偏三甲苯-正辛烷三元体系液-液相平衡数据,得到体系的液-液分层曲线和结点数据,并用液-液分层曲线和体系物性(折光指数、密度)相结合的方法对平衡数据进行了分析。结果表明:溶剂的溶解能力的次序为:N-甲酰吗啉>二甲驱砜>四甘醇;溶剂的选择性次序为:二甲亚砜>四甘醇>N-甲酰吗啉,三种溶剂中二甲亚砜同时具有较高的溶解能力和选择性,较适合萃取偏三甲苯-正辛烷的混合溶液。研究结果可以为溶剂抽提过程相平衡数据库提供基础数据,并为重芳烃抽提的溶剂选择提供参考。 相似文献
73.
GRAPHICAL PROCEDURE FOR REACTIVE DISTILLATION SYSTEMS 总被引:1,自引:0,他引:1
In this paper we analyze a ternary reactive distillation system, where an equilibrium chemical reaction occurs in the liquid phase. By using a set of transformed variables proposed by Barbosa el al. (1988b) and well known graphical procedures for non-reactive systems; the minimum reflux ratio, minimum number of equilibrium stages, mass and energy balances for a reactive column and flash can be easily obtained. The procedures developed in this paper are applied to ISOBUTYLENE-METHANOL-MTBE system.
The main objective in developing this model is to obtain, as much as possible, rigorous information for the analysis of one reactive distillation column in a Process Simulator with capability of handling this type of new operation. 相似文献
The main objective in developing this model is to obtain, as much as possible, rigorous information for the analysis of one reactive distillation column in a Process Simulator with capability of handling this type of new operation. 相似文献
74.
Local equilibrium model described in Part I is used to stimulate both, the steady state operation conditions and transient regime after the start of PSA equipment. The effect of axial dispersion, adsorption isotherm nonlinearity and high pressure level is simulated. On the basis of numerical analysis, the operation of a classical two-bed oxygen generator is compared with two configurations having pressure equalizing step. The optimization strategy of the given PSA equipment has been proposed and the procedure is demonstrated on an example. The scaling-up condition for PSA equipments which can be described by local equilibrium model has been proposed on the basis of the theoretical analysis. 相似文献
75.
A study of nonlinear competitive adsorption equilibria of proteins is of fundamental importance in understanding the behavior
of preparative chromatographic separation. This work describes the nonlinear binary protein adsorption equilibria on ion exchangers
by the statistical thermodynamic (ST) model. The single-component and binary protein adsorption isotherms of bovine hemoglobin
(Hb) and bovine serum albumin (BSA) on SP Sepharose FF were determined by batch adsorption experiments in 0.05 mol/L sodium
acetate buffer at three pH values (4.5, 5.0 and 5.5) and three NaCl concentrations (0.05, 0.10 and 0.15 mol/L) at pH 5.0.
The ST model was found to depict the effects of pH and ionic strength on the single-component equilibria well, with model
parameters depending on the pH and ionic strength. Moreover, the ST model gave acceptable fitting to the binary adsorption
data with the fitted single-component model parameters, leading to the estimation of the binary ST model parameter. The effects
of pH and ionic strength on the model parameters are reasonably interpreted by the electrostatic and thermodynamic theories.
Results demonstrate the availability of the ST model for describing nonlinear competitive protein adsorption equilibria in
the presence of two proteins. 相似文献
76.
Suspension catalytic distillation (SCD) has been developed recently as an innovative technology in catalytic distillation. In this paper, a brief introduction to SCD is given and an equilibrium stage (EQ) model is developed to simulate this new process for synthesis of linear alkylbenzene (LAB) from benzene and 1-dodecene.Since non-ideality of this reaction system is not strong, EQ model developed could be applied to it successfully.Simulation results agree well with experimental data, and indicate some characteristics of SCD process as an advanced technology for the production of LAB: 100% conversion of olefins, low temperature (90-100℃) and low benzene/olefin mole ratio. 相似文献
77.
78.
本文给出计算H2O-NH3-CO2三元体系在温度323.15K~473.15K、压力0.2MPa~8.0MPa、液相NH,摩尔分率≤0.3、富氨区条件下汽液平衡的UNIQUAC模型及其参数,模型的计算结果与试验数据吻合。该模型可用于尿素生产装置中蒸发冷凝、循环吸收以及水解精馏等过程的设备计算。 相似文献
79.
80.
马来酸酐-醋酸异丙酯二元固液平衡的测定和关联陈新志侯虞钧(浙江大学化工系,杭州310027)关键词固液平衡活度系数1引言相平衡数据在化工生产和研究中占有重要的地位。流体相平衡已得到了广泛的研究,并积累了大量的数据,与之相应的实验方法也较为完善,同时... 相似文献