Reactive Distillation Research Papers - Academia.edu (original) (raw)

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- by and +2
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- Engineering, Industrial Engineering, Reactive Distillation, Plantwide Control
- by Senthil Kumar
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- Chemical Engineering, Mass Transfer, Heat Transfer, Reactive Distillation
- by James Riggs
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- Mechanical Engineering, Applied Mathematics, Nonlinear Programming, Finite Element
- by Domingos Barbosa
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- Mechanical Engineering, Chemical Engineering, Design, Reactive Distillation
- by Eugeny Kenig
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- Chemical Engineering, Thermodynamics, Modeling, Heat and Mass Transfer
- by Bramantyo Suprapto
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- Reactive Distillation
- by Johan Grievink
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- Mechanical Engineering, Chemical Engineering, Reactive Distillation, Design method
- by Hemant Kumar
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- Chemistry, Organic Chemistry, Modeling, Reactive Distillation
- by Jiri Hanika and +1
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- Chemical Engineering, Reactive Distillation, Process Integration, Catalyst
- by imran rahman
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- Chemical Engineering, Analytical Chemistry, Separation, Reactive Distillation
- by Eugeny Kenig
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- Engineering, Modeling and Simulation, Reactive Distillation, CHEMICAL SCIENCES
- by Vishal Agarwal
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- Mechanical Engineering, Chemical Engineering, Production, Kinetics
- by Galen Suppes
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- Chemical Engineering, Reactive Distillation

A hybrid reactive distillation system with high selectivity pervaporation was examined to produce butyl acetate and methanol via transesterification of methyl acetate with butanol. High selectivity pervaporation was combined with reactive distillation to eliminate a hitherto required column for the separation of a methanol and methyl acetate azeotrope. The polyamide-6 membrane was used for this purpose because of its high selectivity for methanol while also allowing sufficient permeate flux. The high purity methyl acetate recovered in the retentate stream leads to high conversion in the reactive distillation column, which enhances the energy savings (up to 71%) of this process. The feasibility of the proposed hybrid processes and several alternative designs were evaluated by rigorous simulation and optimization using the Aspen Plus software package. The effects of several designs and operating variables were also investigated for the proposed design. The high potential of the hybrid reactive distillation and pervaporation system for butyl acetate production is very promising; it may not only reduce the total annual costs relative to conventional systems but may also provide an attractive strategy to address problems associated with methanol and methyl acetate azeotropes in the effluent generated in the polyvinyl alcohol industry.

- by hemant nanavati
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- Chemical, Multidisciplinary, Reactive Distillation, Lactic Acid
- by Eugeny Kenig
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- Chemical Engineering, Reactive Distillation, Scaling up, Ethyl Acetate

In this paper, a reactive distillation (RD) column was applied for synthesis n-butyl acetate from n-butanol and acetic acid. The Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetic model and an equilibrium stage model for separation were employed to study the RD process. The results obtained from the equilibrium stage model agreed well with the experiments. The effects of operating variables on the n-butanol conversion and n-butyl acetate purity were further investigated. The optimal column configuration for the production of n-butyl acetate was designed with 5 rectifying stages, 8 reaction stages and 13 stripping stages by the simulation study. According to the simulation results, n-butanol conversion and n-butyl acetate purity all reached greater than 96%.

This paper presents a novel hybrid process combining thermally coupled reactive distillation with membrane-based pervaporation for enhanced production of n-butyl acetate. A conventional reactive distillation process was used as the base case and first optimized for the transesterification of methyl acetate with n-butanol to produce n-butyl acetate. It was observed that methyl acetate recovered in the recycle stream significantly affects the con-version in the reactive distillation column and overall energy efficiency of the whole process. The existing and proposed configurations were evaluated and optimized by simulation in Aspen Plus. The integration of thermally coupled reactive distillation and pervaporation improved the energy efficiency of the reactive distillation process by preventing remixing effect in the reactive distillation column and eliminating the azeotropic nature of the methanol and methyl acetate in the recycle stream, respectively. Finally, integration of the thermally coupled reactive distillation with a commercial pervaporation membrane was explored to take synergistic advantage of the thermally coupled reactive distillation and pervaporation hybrid configuration. As a result, the proposed hybrid design showed remark-ably improved energy efficiency and economics. The total reboiler duty and total annual cost reduced to 63 and 43%, respectively, compared to those of the base case.

- by Dipesh Patle
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- Algorithms, System Identification, Modeling, Modeling and Simulation
- by Salvador Hernandez
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- Chemical Engineering, Design, Modeling, Reactive Distillation

Lactic acid is a simple compound containing both the hydroxyl and carboxylic acid groups, which permit it to participate in many interesting and valuable chemical reactions. Among the known reactions of lactic acid the dehydration to... more

- by Suresh Babu
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- Chemical Engineering, Analytical Chemistry, Separation, Reactive Distillation
- by Iqbal Mujtaba
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- Chemical Engineering, Reactive Distillation, Batch Distillation, Process Model
- by hemant nanavati
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- Chemical, Multidisciplinary, Reactive Distillation, Lactic Acid
- by Eugeny Kenig
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- Chemical Engineering, Thermodynamics, Modeling, Heat and Mass Transfer
- by Xavier Joulia
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- Chemical Engineering, Reactive Distillation, Process Design, Process Synthesis

Catalytic reactive distillation offers new opportunities for manufacturing fatty acid esters, involved both in biodiesel and specialty chemicals. A key problem is the effective water removal in view of protecting the solid catalyst and avoiding costly recovery of the alcohol excess. This work proposes a novel approach based on dual esterification of fatty acid with light and heavy alcohols, namely methanol and 2-ethylhexanol. These two complementary reactants have an equivalent reactive function but synergistic thermodynamic features. The setup behaves rather as reactive absorption combined with reactive azeotropic distillation with heavy alcohol as co-reactant and water-separation agent. Another element of originality is the control of the inventory of alcohols by fixing the reflux of heavy alcohol and the light alcohol column inflow. This strategy allows achieving both stoichiometric reactant feed rate and large flexibility in ester production. The distillation column for recovering light alcohol from water is not longer necessary. The result is a compact, efficient and easy-to-control multi-product reactive setup.

- by Costin Sorin Bildea
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- Mechanical Engineering, Chemical Engineering, Thermodynamics, Biodiesel
- by Salvador Castro
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- Engineering, Reactive Distillation, Industrial, Seismic analysis and design

First steps of the development of a catalytic reactive distillation process for the production of n-propyl acetate based on experiments and simulations are proposed. The kinetics for homogeneously (sulphuric acid) and heterogeneously (Amberlyst 15) catalysed reaction were investigated and the constants for a pseudo-homogeneous model are presented. Pilot plant experiments were performed using a homogeneous strong acid catalyst in a

- by X. Meyer
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- Chemical Engineering, Thermodynamics, Design, Kinetics
- by shubham sharma
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- Materials Engineering, Kinetics, Modeling, Heterogeneous Catalysis
- by Nivea Silva
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- Technology, Chromatography, Catalysis, Experimental Design

In this paper the detailed mathematical dynamic model of semi-batch reactive distillation is formulated for ethyl acetate synthesis (estrefication reaction). The model is composed of material balance, heat balance, and equilibrium equations. The set of nonlinear ordinary differential equations governing the unsteady state composition profile in a semi-batch reactive distillation column were solved by using fourth order Runge-Kutta integration method with the aid of the powerful MATLAB 6.5 program which used to simulate and optimize the semi-batch reactive distillation column. The simulation provides compositions, temperatures and holdups profiles along the column as a function of time. Also the reactant conversion and ethyl acetate purity in distillate are calculated. Finally, the simulation results are analyzed to find the optimum operating policy of reflux ratio, Ethanol/Acetic acid and catalyst weight.

- by Khalid Sukkar
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- Reactive Distillation
- by Vishal Agarwal
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- Mechanical Engineering, Chemical Engineering, Design, Kinetics
- by Shubham Sharma
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- Materials Engineering, Kinetics, Modeling, Comparative Study

Methyl Tert-butyl Ether (MTBE) is usually used as solvent, chemical reagent and antiknock additive to improve octane number of gasoline and can be efficiently produced using reactive distillation column. Maximum production of the MTBE can be achieved if the reaction can be kept at optimum operating conditions and column configuration. In practice, changing the column configuration such as tray or catalyst location always incurs high cost. Therefore, the development of the MTBE reactive distillation model can serve as an important tool in predicting and investigating the optimum production for MTBE without the need to run the actual experiment. Therefore, the development of the MTBE reactive distillation model is essential to simulate the process which can lead to high yields of MTBE production. In this work, a detailed equilibrium (EQ) model for continuous reactive distillation (RD) processes is developed using Aspen Plus™ and Matlab™ software. The simulation results achieved is compared with data available in the literature. The validated model is then further used to study the interaction of various inputs and output variables of the MTBE process which can be used for future empirical model development and control studies.

- by nur aziz
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- Reactive Distillation, Dynamic Simulation, Operant Conditioning, Simulation Study
- by Andrzej Górak
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- Chemical Engineering, Reactive Distillation, Scaling up, Pressure Drop
- by Salvador Hernandez
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- Mechanical Engineering, Energy, Reactive Distillation, Vegetable oil

A conceptual design methodology for the synthesis of reactive distillation columns is presented. The method assesses feasibility of a proposed reactive distillation column, designs the column and allows evaluation of the design for both... more

- by Megan Jobson
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- Chemical Engineering, Reactive Distillation, Design method, Conceptual Design

The ethyl acetate synthesis via heterogeneous reactive distillation is studied experimentally using ethanol and acetic acid. Three types of cation exchanging resins were used as catalysts: Zerolit 225, Zerolit 226 and Ambylite 400. Experiments were carried out in two units of the same dimensions. Each unit consisted of three sections: rectifying, reactive and stripping sections of heights (60+25+20) cm respectively and 2.5cm column diameter. The first unit (column-A-) was a fractionation type and the second unit (column-B-) was packed column. The packing type was hollow glass cylinders with 10 mm height, and 4, 5 mm inner and outer diameter respectively. The experiments were carried out by using two operation modes. The semi-batch and continuous operation mode. In the first part of present investigation, the semi-batch mode was used to evaluate the catalyst type and to evaluate the performance of reactive distillation unit configuration (Fractionation and packed column). Results show that, the column-B-gave higher conversion rates than column-A-. This is attributed to the high surface area available for liquid vapour contact in packed type column, which leads to increasing mass transfer rates. On the other hand, Ambylite 400 catalyst showed higher activity for esterification reaction than other two types of catalysts. The second part of work continued with column-B-only. It is well known that, the esterification process is regarded one of exothermic reactions. Therefore, the monitoring of the temperature distribution along column axial for all three types of catalysts showed that the temperature distribution was essentially the same due to steady state operation in continuous operation mode. On the other hand, the effect of reflux ratio on temperature distribution was clearly noted, that is as the reflux ratio increased the temperature distribution along the column was reduced for each type of catalysts. On the other hand, the experimental results point that, as a reflux ratio increases the conversion rates of acetic acid is increased too because such increasing is related to high mass transfer rates between vapour and liquid along reactive distillation column.

- by Khalid Sukkar
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- Heat and Mass Transfer, Reactive Distillation

– The development and optimization of an empirical model of a reactive distillation process producing palmitic acid methyl ester (PAME), with the aid of Minitab, have been carried out in this work. In order to achieve these, Box-Behnken technique of response surface methodology was used to design experiments that were carried out in a prototype plant of the process developed with the aid of Aspen HYSYS using Distillation Column Sub-Flowsheet as the column type and Wilson model as the fluid package. The results obtained from the analysis of the developed full quadratic model revealed that reboiler duty was not having any significant effect on the process as its probability value (P-value) was obtained to be greater than 0.05 that was chosen, based on the confidence level of 95%.This was found to justify the fact that no reaction was occurring in the reboiler section of the column. Based on this, the full quadratic model developed was modified. Although the R-squared value of the full quadratic model was found to be better than that of the modified one, the latter was found to be better in prediction because its predicted R-squared value was discovered to be greater than that of the former. In addition, the optimum values of the factors estimated with the aid of Minitab were found to be valid ones because the measured optimum mole fraction of palmitic acid methyl ester was found be in good agreement with the predicted one given by the Box-Behnken technique of response surface methodology.

- by Abel A . Adeyi and +2
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- Chemical Engineering, Response Surface Methodology, Reactive Distillation, Aspen Hysys
- by Rey-Anne Paynter
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- Chemical Engineering, Design, Reactive Distillation, Simulation
- by Rolf Findeisen
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- Reactive Distillation, Dynamic Model of WSN, PID control

Ethyl acetate (EtAc) is mainly used as solvent in paints, adhesives and coatings, eliminating the use of aromatic compounds. Reactive distillation is a type of process intensification in which the separation and reaction is combined in one vessel. In this work, reactive distillation (RD) process for EtAc was implemented using process simulator Aspen HYSYS by applying the data obtained from the bibliography. A sensitive analysis was performed to determine the effects of key design and operating variables on column performance and, subsequently, an optimal column configuration was obtained

- by Khairul Naim
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- Reactive Distillation, Simulation, Aspen Hysys, Ethyl Acetate
- by S. Crossley and +1
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- Mechanical Engineering, Chemical Engineering, Theoretical Computer Science, Reactive Distillation