Simulation and experimental studies on reactive distillation column for synthesis of Iso-amyl acetate (original) (raw)
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Production of Iso-Amyl Acetate in a Catalytic Distillation Column: Experimental Studies
Journal of Catalysis, 2014
The investigation of laboratory scale continuous reactive distillation process for the esterification reaction of acetic acid with iso amyl alcohol, catalyzed by the ion exchange resin is carried out. To overcome the equilibrium limitations, the products -viz, iso-amyl acetate and water are separated by distillation during the course of reaction. Approximately 3-m-tall column with reactive section packed with commercial catalytic packing (FENIX TM DM PAK), nonreactive section packed with wire mesh packing is designed and operated for this study. Iso-amyl acetate synthesis is examined with experimental runs on reactive distillation to study the behavior of reactive distillation system for various operating parameters such as feed flow, feed locations, reboiler duty, and molar ratio on the conversion and purity of product. Reasonably good agreement between the experimental and simulation results is realized.
Simulation of a plant scale reactive distillation column for esterification of acetic acid
Computers & Chemical Engineering, 2015
Most of the reactive distillation (RD) simulation studies rely upon very scarce laboratory scale experimental data available in literature. In the present work, an industrial scale RD finishing column for ethyl acetate production is simulated using rate based model of Aspen Plus TM. Available activity coefficient data could not predict composition profiles of the industrial column. Therefore, a new set of NRTL model parameters is established for this system using the vapor-liquid equilibrium data available in literature. This new set of data was used in the non-equilibrium, rate based model of Aspen Plus TM. Baring the variation in concentration profile due to fluctuations caused by pseudo-steady-state behavior of industrial unit, the predicted concentration profile closely matches the plant data. The simulation results for stage efficiencies, component generation rates, and the effect of the organic reflux rate on ethanol conversion and ethyl acetate purity are also presented and discussed.
Mathematical Modeling and Simulation of Reactive Distillation Column using MATLAB and Aspen Plus®
2014
Reactive Distillation (RD) is a combination of reaction and distillation in a single vessel owing to which it enjoys a number of specific advantages over conventional sequential approach of reaction followed by distillation. Improved selectivity, increased conversion, better heat control, effective utilization of reaction heat, scope for difficult separations and the avoidance of azeotropes are the few of the advantages offered by RD. Compared with the conventional process of carrying out reaction and separation sequentially, RD column can favourably influence conversion and selectivity, especially of equilibrium reactions. However, there are feasibility constraints resulting both from thermodynamics and chemistry. The process intensification leads to higher complexity and this is especially true for heterogeneously catalyzed RD with its complex interaction between vapors, liquid and immobilized solid catalyst phase. This work mainly deals with synthesis of iso-amyl acetate in RD column. This paper comprehensively reports on both simulation work using Aspen Plus ® and MATLAB (TM) . The simulations were based on the equilibrium-stage approach and, for comparison; a rate-based model is also used. In this paper, the equilibrium model for synthesis of iso-amyl acetate was developed. The simulation studies were performed in Aspen Plus ® and MATLAB (TM) . The Published experimental data on phase equilibrium and reaction studies was used to verify the model predictions. The experimental results from literature were compared with model predictions and were found to be close to those available in the literature.
The esterification of acetic acid with n-butanol was studied in the presence of ion-exchange resin catalysts such as Amberlyst-15 to determine the intrinsic reaction kinetics. The effect of various parameters such as temperature, mole ratio, catalyst loading, and particle size was studied. Kinetic modeling was performed to obtain the parameters related to intrinsic kinetics. Pseudohomogeneous model was developed The rate expressions would be useful in the simulation studies for reactive distillation. The experimental data generated for the reaction under total reflux were validated successfully using the developed rate equation and estimated values of kinetic parameters.In this work, the synthesis of butyl acetate, starting from n-Butanol and acetic acid, using reactive distillation on acidic polymeric resins is investigated. The study proceeds to the continuous process to achieve the steady state equilibrium of the involved multi component mixtures and then to the study modifications to be done for the achievement of the maximum seperation. Next, the separation-reaction process is investigated using a continuous Reactive distillation .(Gangadwala, J.; Mankar, S.; Mahajani, S.,2003)
Process design and simulation strategies for reactive distillation column
2014
The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately. Reactive Separation Processes (RSP's) combine the unit operations of reaction and separation into a single, simultaneous operation. It provides an important synergistic effect and brings about several advantages. This fusion of reaction and separation into one combined operation brings simplicity and novelty to the process flow sheet. This technology has been proved to have conclusive advantages over conventional technologies in terms of their energy; capital cost reductions and increased reaction efficiency.[1,2] RSP's are popular for the cost savings in investment and operation garnered on successful scale-up to commercial operations. These technologies are gaining importance due to economic opportunities which have caused the emergence of new industries using new separation and process technologies, to give better efficiencies of operation and quantification of product demanded by food, pharmaceuticals, polymer, and electronic industries. Due to changes in the availability and pricing of the key resources, and growing concern for protecting our environment, these technologies are also being seen as front-runner in the field of industrial separations. Reactive distillation (RD) is an attractive and promising process, which has been established in a variety of successful commercial applications. Compared with the conventional process of carrying out reaction and separation sequentially, the in-situ removal of products formed in the reaction zone of a RD column can favorably influence conversion and selectivity, especially of equilibrium limited reactions. Together with a significantly reduced effort in the separation train, this can result in major energy as well as capital cost savings. However, there are feasibility constraints resulting both from thermodynamics and chemistry. [5 In addition to this, the process intensification leads to higher complexity. This holds especially true for the case of heterogeneously catalyzed RD with its complex interaction between vapor, liquid and immobilized solid catalyst. [5, 6]
Modeling and Simulation of Ethyl Acetate Reactive Distillation Column
2006
Reactive distillation (RD) is an attractive way of improving process economics by combining distillation and reaction, especially for equilibrium limited reactions such as esterification. Two of the most studied esterification reactions via RD in the literature are methyl acetate synthesis and ethyl acetate synthesis. The ideal performance of the RD column would be to achieve almost complete conversion of both reactants while at the same time producing pure esters as distillate. From I also would like to thank members of postgraduate committee for their many useful suggestions and comments that enhanced the quality of this work. Finally, I would like to express my deepest gratitude to my parents, siblings for all their supports and to my beloved wife for her love; continuous encouragement and caring that brightened my life.
Recovery of dilute acetic acid through esterification in a reactive distillation column
Catalysis Today, 2000
The recovery of acetic acid from its dilute aqueous solutions is a major problem in both petrochemical and fine chemical industries. The conventional methods of recovery are azeotropic distillation, simple distillation and liquid-liquid extraction. Physical separations such as distillation and extraction suffer from several drawbacks. The esterification of an aqueous solution (30%) of acetic acid with n-butanol/iso-amyl alcohol is a reversible reaction. As excess of water is present in the reaction mixture, the conversion is greatly restricted by the equilibrium limitations. The esters of acetic acid, namely, n-butyl acetate and iso-amyl acetate, have a wide range of applications. In view of the appreciable value of these esters, the present work was directed towards recovery of 30% acetic acid by reaction with n-butanol and iso-amyl alcohol in a reactive distillation column (RDC) using macroporous ion-exchange resin, Indion 130, as a catalyst bed, confined in stainless steel wire cages. Experiments were conducted in order to achieve an optimum column configuration for the synthesis of n-butyl acetate/iso-amyl acetate in an RDC. The effect of various parameters, e.g. total feed flowrate, length of catalytic section, reflux ratio, mole ratio of the reactants, location of feed points and effect of recycle of water were studied.
Chemical Engineering and Processing: Process Intensification, 2007
The reaction kinetics of the esterification of acetic acid with ethanol, catalyzed both homogeneously by the acetic acid, and heterogeneously by Amberlyst 15, have been investigated. The reactions were carried out at several temperatures between 303.15 and 353.15 K and at various starting reactant compositions. Homogeneous and heterogeneous reactions have been described using the models proposed by Pöpken et al. [T. Pöpken, L. Götze, J. Gmehling, Reaction kinetics and chemical equilibrium of homogenously and heterogeneously catalyzed acetic acid esterification with methanol and methyl acetate hydrolysis, Ind. Eng. Chem. Res. 39 (2000) 2601-2611]. These models use activities instead of mole fractions. Activity coefficients have been calculated using ASOG [K.
Reactive Distillation for Ethyl Acetate Production
2017
We describe a model and calculation technique that supports the design of reactive distillation columns using ChemCAD simulation software. The approach is illustrated for the production of ethyl acetate because it is inevitably needed as an active solvent used in a wide range of applications across many industries. Ethyl acetate is normally produced by esterification of ethanol and acetic acid. A reactive distillation column, combining the reaction and separation into a single stage, is proposed. The ethyl acetate is always distilled and withdrawn out of the reaction zone, the equilibrium is shifted to the right and the reactants conversion is improved. These are the advantages of this combination. Sensitive analyses are carried out to investigate the influence of the different parameters such as pressure, reflux ratio, feed stage location. The effect of reactants excess on the reactants conversion and the ethyl acetate production is also studied. The optimum operation conditions an...
Studies in esterification reaction using Batch Reactive Distillation column
The esterification of acetic acid with n-butanol was studied in the presence of ion-exchange resin catalysts such as Amberlyst-15 to determine the intrinsic reaction kinetics. The effect of various parameters such as temperature, mole ratio, catalyst loading, and particle size was studied. Kinetic modeling was performed to obtain the parameters related to intrinsic kinetics. Pseudohomogeneous model was developed The rate expressions would be useful in the simulation studies for reactive distillation. In this work, the synthesis of butyl acetate, starting from n-Butanol and acetic acid, using batch reactive distillation on acidic polymeric resins is investigated.