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이범석 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-
An explicit algorithm is presented for determining the cooling water velocities flowing in the heat exchangers network in the chemical plant. The problem solution is based on the steady-state equations which describe the cooling water which flows in the heat exchangers network. Since the equations are non-linear, Newton-Raphson method is used to solve the system of equations. Numerical examples are presented to illustrate the scope of this work which can be handled with the formulation.
Simulation of 1,3-butadiene extractive distillation process using N-methyl-2-pyrrolidone solvent
YoungHoon Kim,Bomsock Lee,Sung Young Kim 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.11
A computer simulation was performed using a commercial process simulator, Aspen Plus, for NMP (Nmethyl-2-pyrrolidone) extractive distillation process to separate 1,3-butadiene from the C4 hydrocarbon mixtures. The Redlich-Kwong equation of state and NRTL activity coefficient model were used to calculate thermodynamic properties in the simulation of the extractive distillation process. Binary parameters of the NRTL model not provided in the simulator were estimated using the UNIFAC method. The simulation results of the 1,3-butadiene recovery from the C4 mixtures were in good agreement with the plant operation data. The process simulation showed that the material balances in the extractive distillation were successfully predicted for various NMP solvent flow rates. The results obtained in this work provided the optimum solvent rate and the reflux ratio for the NMP extractive distillation process to separate 1,3-butadiene from the C4 mixtures.
다공성 관을 흐르는 유체의 유속, 압력, 투과수 유량에 관한 연구
이정묵,이범석 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-
The flow rate of the fluid flowing in a porous membrane tube decreases as the fluid flows out through the wall of the tube. In order to find out the relationships between the flow velocity, pressure and the permeate flow rate, we considered the membrane as a linear porous tube with constant diameter and set the mass balance with the fluids and the permeates for each unit length. On this basis, the systems of nonlinear second order differential equations are derived for the entire porous tube. Since these equations are nonlinear, Gauss-Siedel method or the numerical method for the nonlinear differential equations must be used to solve the system. Since the flow rate of the permeate is varied with the operating condition such as the pressure, the solutions of the equations are achieved at each condition, using the numerical integration methods such as the Simpson's rules. In order to analyze and compare simulation results, we have performed the practical experiments using the porous tubular membranes with the constant diameter. The computer simulation and the experimental results are presented to illustrate the scope of this work.
인터넷 웹을 기반으로 한 공정규명과 공정제어 교육 시스템
김태언,이범석 경희대학교 산학협력기술연구원 2002 산학협력기술연구논문집 Vol.8 No.-
As the computer systems are developed rapidly, the area of the engineering softwares are also expanded. Most of these engineering softwares are the high-priced commercial softwares for the exactness of the results. However, the commercial softwares are too expensive for some users. especially undergraduate students. In this study, the engineering software for the chemical process control is made of the JAVA language in a web environment. Then the virtual experiment of the process control can be executed free of charge using this software. This software is worked on the internet and shows how to identify a unknown process system and how to tune the control parameters to operate the process system. The numerical examples are presented to illustrate the virtual experiment for the process control using the software made in this study.
Park, Bum Jun,Lee, Mina,Lee, Bomsock,Furst, Eric M. The Royal Society of Chemistry 2015 SOFT MATTER Vol.11 No.44
<P>We study the lateral capillary interactions between colloids beneath an oil-water interface that lead to closely packed two-dimensional self-assembled colloidal crystals. These capillary forces are caused by the overlap of deformed interfaces above colloids on a solid substrate. The interface deformation is due to the electrostatic disjoining pressure between the charged particles and the charged oil-water interface. It is notable that the short-range (i.e., on the nanometer scale) and out-of-plane electrostatic double-layer interactions, which occur through an aqueous phase, can generate the long-range lateral capillary attraction (i.e., on the micrometer scale).</P>