scholarly journals A Novel Mass Transfer Model to Describe the Separation Process in Reverse Osmosis of Glucose

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Chenghan Chen ◽  
Yanwei Wang ◽  
Furong Tan ◽  
Qili Zhu
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Reverse Osmosis ◽  
Production Efficiency ◽  
Mathematic Model ◽  
Mass Transfer Process ◽  
Theoretical Research ◽  
Transfer Model ◽  
Calculation Results ◽  
Improve Production Efficiency

Basic and theoretical research on processes such as reverse osmosis (RO) is essential in the fermentation industry to improve production efficiency and reduce cost. Here, we focus on the RO concentration of glucose solutions. We constructed a mathematic model that incorporates various membrane and experimental parameters to characterize the mass transfer process of RO membrane and validated the model output with experimental data. Calculation results were highly consistent with the experimental data, demonstrating that this model can be useful for predicting the RO concentration process.

A Study of GOTHIC 8.0 Code Application to AP1000 Containment Response

2013 ◽  
Author(s):  
Guodong Wang ◽  
Zhe Wang
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Mass Transfer Process ◽  
Transfer Model ◽  
Mass Transfer Model ◽  
Containment Model ◽  
Evaporation Heat ◽  
Containment Shell ◽  
Film Heat Transfer ◽  
Inside Wall

The AP1000 containment model has been developed by using WGOTHIC version 4.2 code. Condensation heat and mass transfer from the volumes to the containment shell, conduction through the shell, and evaporation from the shell to the riser were all calculated by using the special CLIMEs model. In this paper, the latest GOTHIC version 8.0 code is used to model both condensation and evaporation heat and mass transfer process. An improved heat and mass transfer model, the diffusion layer model (DLM), is adopted to model the condensation on the inside wall of containment. The Film heat transfer coefficient option is used to model the evaporation on the outside wall of containment. As a preliminary code consolidation effort, it is possible to use GOTHIC 8.0 code as a tool to analysis the AP1000 containment response.

Numerical Simulation of Heat and Mass Transfer Enhancement in Absorption Process With Double-Side Film-Inversion

2008 ◽  
Author(s):  
Ya-Ping Chen ◽  
Chen-Jie Shi ◽  
Ming-Heng Shi ◽  
Chen-Min Ling
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Vertical Plane ◽  
Mathematic Model ◽  
Absorption Process ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Plane Plate ◽  
Before And After ◽  
Calculation Results

Film-inversion is an effective way recently developed to enhance heat and mass transfer in absorbers. However, only one-side of round or rectangular tube i.e. half of the total heat transfer area is used to form film-inverting configuration in the published literature. The paper presents a double-side film-inverting scheme, which consists of two plate bundles and a set of comb shaped conjunction guiders between them for leading solution film from both-sides of each couple of the upper plate bundle to the opposite sides of the bottom ones. A two-scale crosswise corrugation plate bundle, which has vertical large corrugations and horizontal small ones, is suggested instead of the plane plate bundle. The horizontal small corrugation can make the film turbulent and film distribution uniform before and after inversion with surface tension effect, thus increasing the heat and mass transfer coefficients of the absorption process. A mathematic model for heat and mass transfer in absorption process with aqueous Li-Br solution falling film-inverting on two sequential vertical plane plates was established and solved numerically. The distributions of dimensionless velocity, temperature and concentration of liquid film profile before and after film-inverting were obtained. The influence of the number of inversion on heat and mass transfer characteristics was analyzed. The calculation results show that the heat and mass transfer coefficients of the once-film-inverting scheme have about 58% and 73% increment respectively over these of the none film-inverting scheme.

Separation of aqueous organic multi-component solutions by reverse osmosis — development of a mass transfer model

Desalination ◽  
2001 ◽  
Vol 133 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Jenny Weißbrodt ◽  
Michael Manthey ◽  
Birgit Ditgens ◽  
Günther Laufenberg ◽  
Benno Kunz
Keyword(s):  
Mass Transfer ◽  
Reverse Osmosis ◽  
Transfer Model ◽  
Mass Transfer Model

scholarly journals Optimal Catalyst and Cocatalyst Precontacting in Industrial Ethylene Copolymerization Processes

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Paul Aigner ◽  
Christian Paulik ◽  
Apostolos Krallis ◽  
Vasileios Kanellopoulos
Keyword(s):  
Mass Transfer ◽  
Catalyst Activity ◽  
Plug Flow ◽  
Mass Transfer Process ◽  
Catalyst System ◽  
Transfer Model ◽  
Catalyst Activation ◽  
Before And After ◽  
Natta Catalyst ◽  
Experimental Findings

In industrial-scale catalytic olefin copolymerization processes, catalyst and cocatalyst precontacting before being introduced in the polymerization reactor is of profound significance in terms of catalyst kinetics and morphology control. The precontacting process takes place under either well-mixing (e.g., static mixers) or plug-flow (e.g., pipes) conditions. The scope of this work is to study the influence of mixing on catalyst/cocatalyst precontacting for a heterogeneous Ziegler-Natta catalyst system under different polymerization conditions. Slurry ethylene homopolymerization and ethylene copolymerization experiments with 1-butene are performed in a 0.5 L reactor. In addition, the effect of several key parameters (e.g., precontacting time, and ethylene/hydrogen concentration) on catalyst activity is analyzed. Moreover, a comprehensive mass transfer model is employed to provide insight on the mass transfer process and support the experimental findings. The model is capable of assessing the external and internal mass transfer limitations during catalyst/cocatalyst precontacting process. It is shown that catalyst/cocatalyst precontacting is very important for the catalyst activation as well as for the overall catalyst kinetic behavior. The study reveals that there is an optimum precontacting time before and after which the catalyst activity decreases, while this optimum time depends on the precontacting mixing conditions.

scholarly journals Kinetics and Characteristics of Soybean Oil and Protein Extracted by AOT Reverse Micelle Technology

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Lifen Zhang ◽  
Fusheng Chen ◽  
Wen Zhang ◽  
Qian Wu
Keyword(s):  
Mass Transfer ◽  
Amino Acid ◽  
Soybean Oil ◽  
Reverse Micelle ◽  
Soybean Protein ◽  
Mass Transfer Process ◽  
Physicochemical Analysis ◽  
Original Structure ◽  
Transfer Model ◽  
Set Up

The mass transfer process of soybean oil extracted by AOT reverse micelle was determined. Meanwhile, the physicochemical properties of oil and structural properties of protein were also investigated by gas chromatography (GC), Fourier infrared spectrum (FTIR), and amino acid analyzer. The results indicated that the mass transfer model can be set up as 1+2(1-x)-3(1-x)2/3=0.248•exp⁡(-720.8/T)•t. The reaction probably belongs to internal diffusion. The oil extracted by AOT reverse micelle was in better quality according to physicochemical analysis. The soybean protein almost retained its original structure in AOT reverse micelle by FTIR and amino acid analysis. Therefore, AOT reverse micelle is an attractive procedure for extracting oil and protein simultaneously.

Modeling and Analysis of Multi-Objective Automatic Balance System in the Hydrometallurgical Process

2012 ◽  
Vol 546-547 ◽  
pp. 784-789
Author(s):  
Ke Liang Zhou ◽  
Yu Lan Jiang ◽  
Jin Lin Huang ◽  
Bin Yan
Keyword(s):  
Production Process ◽  
Production Efficiency ◽  
Mathematic Model ◽  
System Model ◽  
Level Control ◽  
Modeling And Analysis ◽  
Balance System ◽  
Level Control System ◽  
Automatic Balance ◽  
Improve Production Efficiency

During the hydrometallurgical production process, there are many towers working at the same time. In order to improve production efficiency, we need to control the level height of every tower. Takes example for 6 towers, do research on the level control system in metal ions production process. According to the theory of materials balance, the mathematic model of the system are established. Programmed the mathematic model by Matlab. In order to make the level of each tower at the same height, work out how many adjust times needed and how much adsorbate every tower inflow and outflow each time. Then analysis the data results of error and variance, which have confirmed the feasibility and rationality of the level automatic balance system model established in this paper.

scholarly journals New explicit analytical solutions of equations for heat and mass transfer in a cooling tower energy system

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989614
Author(s):  
Qianjian Guo ◽  
Xiaoni Qi ◽  
Peng Sun ◽  
Pengjiang Guo
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Analytical Solutions ◽  
Cooling Tower ◽  
Mass Transfer Process ◽  
Energy System ◽  
Transfer Model ◽  
Elementary Functions ◽  
Solutions Of Equations ◽  
The One

The aim of this article is to develop an accurate and fast analytical method for heat and mass transfer model in a cooling tower energy system. Some algebraic explicit analytical solutions of the one-dimensional differential equation sets describing the coupled heat and mass transfer process in a cooling tower are derived. The explicit solutions have not yet been published before. The explicit equations of heat and mass transfer are expressed in elementary functions. By solving these differential equations in a cooling tower, the temperature distribution of liquid and gas, the moisture content in the air can be obtained in each section over the vertical height of the tower. A comparison of analytical and experimental results was given in this article, and good agreements were shown for the typical cases studied. The analytical solutions can serve as a benchmark to check the results of numerical calculation.

Mass Transfer Flux at Solid-Liquid Contacting Interface

2003 ◽  
Vol 9 (3) ◽  
pp. 193-199 ◽  
Author(s):  
J. Shi ◽  
M. Le Maguer
Keyword(s):  
Mass Transfer ◽  
Cell Structure ◽  
Solid Material ◽  
Mass Transfer Process ◽  
Liquid System ◽  
Transfer Model ◽  
Operational Parameters ◽  
High Concentration ◽  
Osmotic Treatment ◽  
Solid Liquid

When cellular materials are immersed in a solution of high concentration, the mass transfer is considered a multi-component transport process in which simultaneous and countercurrent flows occur in the biological tissue. The mass transfer process of each component in the solid-liquid system is affected not only by operational parameters, but also by the presence of other components. The main driving force for the mass transfer phenomena is attributed to the concentration gradient between external and internal solid material, and the interaction among fluxes and tissue matrix. Matrix deformation and tissue shrinkage are important characteristics influencing mass transfer. The coupled mass transfer fluxes across the interface in an isothermal solid-liquid system were analysed by means of a film model as a function of the concentration gradients, based on the generalised multi-component mass transfer theories. Several possible situations of cell structure changes are discussed, and the effect of structural shrinkage on mass transfer is modelled in this study. The mass transfer model and parameters proposed in the present study is applicable to the unit operation such as osmotic treatment of cellular porous biomaterial.

Modelling of Heat and Mass Transfer Processes and Emulsion Stratification Under the Influence of Electric Fields

2009 ◽  
Vol 4 (4) ◽  
pp. 15-22
Author(s):  
Galiya Zakirjanova ◽  
Liana Kovaleva ◽  
Nur Nasyrov
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Radio Frequency ◽  
Heat And Mass Transfer ◽  
Electric Fields ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Ponderomotive Forces ◽  
Calculation Results ◽  
Em Field

The influence of the radio-frequency (RF) and law-frequency (LF) electric fields and their joint impact on processes of heat and mass transfer and emulsion stratification on oil and water are theoretically investigated. At modeling the effect of ponderomotive forces on the medium from electromagnetic (EM) field and also heat and mass transfer cross effects arising at nonisothermal current of liquid are considered. Comparison of calculation results with known experimental data is carried out.

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