Transient Model of Volatile Organic Compound Recovery Column by Adsorption Process

การพัฒนาแบบจำลองทางคณิตศาสตร์ของคอลัมน์ดูดซับเพื่อใช้ในกระบวนการนำสารอินทรีย์ระเหยง่ายกลับมาใช้ใหม่

Name: Rungroj Chuvaree

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Name: รุ่งโรจน์ ชูวารี

keyword: Adsorption Process

; Dynamic Behavior

; Mathematical Model

; Volatile Organic Compounds

; VOCs

Abstract: In the manufacturing of various products, volatile organic compounds (VOCs) are often used for different purposes. These VOCs are very volatile by their nature; therefore emission of VOCs would occur. Emission of VOCs from industrial facilities causes serious air pollution problem and entails much financial losses. The recovery of these VOCs is highly desirable due to both environmental and economic concerns. There are numbers of technologies available for VOCs abatement, among of which the adsorption process is widely used because of its low cost, easy operation and possible recovery of most VOCs. This research aimed to develop a mathematical model for describing the dynamic behavior of the adsorption process. In addition, the effects of the operating conditions on the adsorption performance and the effects of parameters on the modeling results were investigated. The operating conditions studied were bed height, inlet concentration and fluid velocity, and thestudied parameters were the external mass transfer coefficient, pore diffusivity, particle size and isotherm parameters. Furthermore, the developed model was used to simulate an adsorption column for recovery of toluene and methyl ethyl ketone (MEK) from a PVC manufacturing plant. The mathematical model of the isothermal, dynamic adsorption process in a fixed bed was developed based on the transient material balance in bulk gas phase and adsorbed phase, adsorption equilibrium relationship, boundary conditions and initial conditions. The equilibrium relationship was described by the Langmuir equation. The set of partial differential equations was discretized into a system of ordinary differential equations (ODEs) by orthogonal collocation method. The resulting set of ODEs was numerically solved by the numerical integrator subroutine LSODES, contained as a part of the software package ODEPACK. The results of the model were compared with the experimental results obtained from the published literature. The comparing results showed that the developed model can well predict the breakthrough results of the adsorption process, with the correlation coefficient of 0.98. The effects of operating conditions on the adsorption performance were investigated and presented in this research. The parametric sensitivity results demonstrated that a correct adsorption isotherm was more crucial than particle kinetics in the modeling of the adsorption column. Moreover, it could be deduced that the overall mass transfer in adsorption process was controlled by the internal mass transfer. The design of the adsorption column for recovery of toluene and methyl ethyl ketone was based on 90 percent recovery purity. All the results were simulated based on the column with a diameter of 50 cm. The bed depth service time (BDST) was analyzed for design purposes. In addition, the critical bed depth, predicted height and velocity of adsorption zone were determined. All of the results presented in this research can be used as guidelines for design of adsorption column. Nevertheless, it was recommended that the model can be further developed to extend the application. Additionally, the multicomponent mathematical model should be considered in order to obtain more accurate results. More importantly, to make the results more reliable, the experiment should be performed.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Asst.Prof. Anan tongta

Role: Supervisor

Created: 2545

Issued: 2005-10-03

Modified: 2006-05-10

วิทยานิพนธ์/Thesis

ISBN: 9744560339

CallNumber: CHE1385

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมเคมี

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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