Filters








3,508 Hits in 7.3 sec

New processes for recovery of acetic acid from waste water

Jignesh Gangadwala, Gabriel Radulescu, Achim Kienle, Frank Steyer, Kai Sundmacher
2007 Clean Technologies and Environmental Policy  
The presence of a three-phase regime on the column stages due to a liquid-liquid phase split between aqueous and organic phases is a typical characteristic of this process.  ...  A modern modeling approach is presented to detect the existence of potential phase splitting in this column. A good agreement of a phase splitting model with the literature data has been shown.  ...  However, dynamic simulation of a (reactive) distillation column taking into account the potential appearance of a second liquid phase is a much more difficult task.  ... 
doi:10.1007/s10098-007-0101-z fatcat:b7dvuryxwreddbwwrynl4yskme

Singular points of reactive distillation systems

Zhiwen Qi, Dietrich Flockerzi, Kai Sundmacher
2004 AIChE Journal  
Based on the singularity analysis, a single-feed reactive distillation column can be designed.  ...  Geometrically, the singular points of both batch processes are located on a common potential singular point surface (PSPS) whose trajectory depends on the reaction stoichiometry and the phase equilibria  ...  To check the correctness of this split, we simulated the reactive distillation column using the equilibrium stage model with the obtained configurations.  ... 
doi:10.1002/aic.10259 fatcat:mq4oq7r3kfh6pk4ghqinfo3nmi

Startup of a reactive distillation process with a decanter

F. Forner, M. Brehelin, D. Rouzineau, M. Meyer, J.-U. Repke
2008 Chemical Engineering and Processing  
The startup of a reactive distillation process for the production of propyl acetate including a decanter is studied.  ...  A simulation model is presented which describes the whole startup from a cold and empty state and takes into account the liquid phase split in the decanter.  ...  Modelling and simulation For the modelling of reactive distillation in packed columns, both equilibrium stage (EQ) and non-equilibrium stage (NEQ) approaches are used [16] .  ... 
doi:10.1016/j.cep.2007.09.005 fatcat:l2sk2bkeqvegbj47btyyq6scpu

Modeling/Simulation of the Dividing Wall Column by Using the Rigorous Model

Chi Zhai, Qinjun Liu, Jose A. Romagnoli, Wei Sun
2019 Processes  
Based on the rigorous model, the influences of liquid split ratio and vapor split ratio are discussed, and it is shown that the heat duty is sensitive to changes on the liquid and vapor split ratio.  ...  In this paper, a rigorous mathematical model is proposed based on the mass balance, the energy and phase equilibrium of the DWC, where decision variables and state variables are equally treated.  ...  [11] proposed an innovative dimethyl ether synthesis process based on a reactive DWC, in which a reactive distillation unit was effectively conducted in one DWC.  ... 
doi:10.3390/pr7010026 fatcat:qflnanobtjh7rhaxm2p26oypdu

Non-equilibrium stage modeling and non-linear dynamic effects in the synthesis of TAME by reactive distillation

Amit M. Katariya, Ravindra S. Kamath, Kannan M. Moudgalya, Sanjay M. Mahajani
2008 Computers and Chemical Engineering  
This work emphasizes on non-linear effects in dynamic simulations of reactive distillation column.  ...  For certain configurations, dynamic simulation with equilibrium stage (EQ) model leads to sustained oscillations (limit cycles) which have been reported in our earlier work [Katariya, A. M., .  ...  Currently, such simulations are based on the well-known equilibrium stage model. The EQ model assumes that the vapor and liquid leaving a stage are in equilibrium.  ... 
doi:10.1016/j.compchemeng.2007.11.009 fatcat:ev2ept4apnapnb44ib2irft6au

Real-Time Optimizing Nonlinear Control Applied to a Continuous Reactive Distillation Process

Elrashid Idris, Sebastian Engell
2011 IFAC Proceedings Volumes  
In this paper we demonstrate the feasibility and the potential of the optimizing nonlinear control for a challenging example, a reactive distillation column.  ...  In recent years, it has been proposed to use nonlinear model-based optimization of the available degrees of freedom of a process over a finite moving horizon to integrate set-point optimization and feedback  ...  Fruitful discussions with Alaeldin Bouaswaig and Gaurang Shah contributed to the results shown here. The contributions of other colleagues are also recognized.  ... 
doi:10.3182/20110828-6-it-1002.03751 fatcat:iumz7qspcnhinmtoydmn7c5bg4

Synthesis of n-hexyl acetate by reactive distillation

Markus Schmitt, Hans Hasse, Klaus Althaus, Hartmut Schoenmakers, Lars Götze, Peter Moritz
2004 Chemical Engineering and Processing  
It is shown, that, based on a sound knowledge on reaction kinetics and thermodynamic properties it is possible to successfully describe the studied reactive distillation process. 6 12 2  ...  Predictions from stage models of different complexity are compared to the results of experiments.  ...  Both models are based on the stage concept and use the assumption of vapor-liquid equilibrium on each stage.  ... 
doi:10.1016/s0255-2701(03)00124-7 fatcat:hfd4f3czi5fljiswupuovnay4y

A Review on AI Control of Reactive Distillation for Various Applications [chapter]

Vandana Sakhre
2020 Wastewater Treatment [Working Title]  
The chapter is focused on dynamics and control of Reactive distillation, its control using Conventional Techniques, Model Predictive Control MPC), Reactive Distillation using Soft Sensors/Soft Controllers  ...  These techniques have potential use in process industries to have better soft sensor control of nonlinear processes.  ...  Academy of Higher Education, Dubai campuses to carry out extensive research work.  ... 
doi:10.5772/intechopen.94023 fatcat:4rj3qkdlz5defma563f2qopjaq

From simulation studies to experimental tests in a reactive dividing wall distillation column

Raúl Delgado-Delgado, Salvador Hernández, Fabricio Omar Barroso-Muñoz, Juan Gabriel Segovia-Hernández, Agustín Jaime Castro-Montoya
2012 Chemical engineering research & design  
In this work, experimental results for the production of ethyl acetate in a reactive dividing wall distillation column are presented for first time.  ...  thermally coupled distillation sequences have been studied since many years, but the real implementation occurred until middle of the 1980s using a single shell divided by a wall named dividing wall distillation  ...  The NRTL model was chosen to calculate the equilibrium data, because it is well known that for this reactive system two liquid phases can be formed in equilibrium with the vapor phase.  ... 
doi:10.1016/j.cherd.2011.10.019 fatcat:rdxu4m46pvgqvkg6g65y5umgz4

Optimal Design and Effective Control of the tert-Amyl Methyl Ether Production Process Using an Integrated Reactive Dividing Wall and Pressure Swing Columns

Ao Yang, Liping Lv, Weifeng Shen, Lichun Dong, Jie Li, Xin Xiao
2017 Industrial & Engineering Chemistry Research  
Although reactive dividing wall column where reaction and separation take place in one vessel has been developed with less capital and operating cost, little work on its application to TAME production  ...  purity of 99.958 mol%, significantly reducing the total annualized cost by 43.58% and decreasing the exergy loss by 48.24% compared to the existing TAME production process using reactive distillation.  ...  The UNIQUAC model is applied for the calculation of activity coefficients in Vapor-Liquid Equilibrium (VLE).  ... 
doi:10.1021/acs.iecr.7b03459 fatcat:syqefo4ptvaqtab6crgryoo5gi

A review on process intensification in HiGee distillation

German E Cortes Garcia, John van der Schaaf, Anton A Kiss
2017 Journal of chemical technology and biotechnology (1986)  
This review paper describes the state-of-the-art in the field of HiGee contactors used for gasliquid mass transfer processes, with a special focus on distillation, and for heterogeneously catalyzed reactions  ...  The working principles of HiGee technology, as well as the modeling, design and control aspects, and practical applications are explained and discussed.  ...  In contrast with equilibrium models, non-equilibrium models do not assume that the streams leaving a separation stage are in thermodynamic equilibrium.  ... 
doi:10.1002/jctb.5206 fatcat:alf72xxvbrbnpmppmjipatnf2i

The use of dilute acetic acid for butyl acetate production in a reactive distillation: Simulation and control studies

Amornchai Arpornwichanop, Chantarawadee Wiwittanaporn, Suthida Authayanun, Suttichai Assabumrungrat
2008 Korean Journal of Chemical Engineering  
Simulation studies are performed in order to investigate effect of the concentration of dilute acetic acid and key process parameters on the performance of the reactive distillation in terms of acetic  ...  As a result, the primary concern of the present study is the application of reactive distillation as a potential alternative method to recover dilute acetic acid.  ...  ACKNOWLEDGEMENTS The support from the Thailand Research Fund, Commission on Higher Education, and the Graduate School of Chulalongkorn University is gratefully acknowledged.  ... 
doi:10.1007/s11814-008-0207-y fatcat:az7vdfgj3neahke4ishjyn2tye

A Short Method To Calculate Residue Curve Maps in Multireactive and Multicomponent Systems

Marcelino Carrera-Rodríguez, Juan Gabriel Segovia-Hernández, Adrián Bonilla-Petriciolet
2011 Industrial & Engineering Chemistry Research  
of liquid phase.  ...  This method is based on the application of reaction-invariant composition variables and assumes that the phase equilibrium constants (i.e., the relative volatilities) are independent of the temperature  ...  On the other hand, in a simple distillation process with or without chemical reactions, a liquid is vaporized and the vapor is removed from contact with the liquid as it is formed (see Figure 1 ).  ... 
doi:10.1021/ie101335z fatcat:lvd6mvbigjalxnlel6crdgj2ve

Experimental analysis in different batch operating units for process intensification: methyl acetate production case study

B. Ganesh, K. Yamuna Rani, B. Satyavathi, K. S. K. Rao Patnaik
2014 International Journal of Industrial Chemistry  
Integrated reaction and separation is considered in two ways, namely by simple reactive batch distillation, and by multi-stage reactive batch distillation with partial reflux.  ...  It is observed that conversions beyond equilibrium conversion are achieved by process intensification, and relatively purer products are obtained compared to the base case.  ...  Acknowledgments The authors acknowledge Department of Science and Technology (DST), New Delhi, India and CSIR XII Plan Project, INDUS MAGIC for the financial support, and the first author acknowledges  ... 
doi:10.1007/s40090-014-0023-7 fatcat:prsbkjx3kvh5rags2gfr2vmi6m

Feasibility of novel integrated dividing-wall batch reactive distillation processes for the synthesis of methyl decanoate

Dhia Y. Aqar, Nejat Rahmanian, Iqbal M. Mujtaba
2018 Separation and Purification Technology  
Aiming to overcome this type of the potential problem, novel integrated divided-wall batch reactive distillation configuration (i-DWBD) with recycling from the distillate tank is established in this study  ...  (DWBD), and split reflux divided-wall (sr-DWBD) batch reactive distillation configurations in terms of maximum achievable purity of MeDC and higher conversion of DeC into MeDC.  ...  A detailed dynamic model based on mass and energy balances is developed and incorporated into the optimization framework.  ... 
doi:10.1016/j.seppur.2018.03.025 fatcat:kgpi73j6arhkbk426ynq46omce
« Previous Showing results 1 — 15 out of 3,508 results