Peter Lang

Peter Lang
Budapest University of Technology and Economics · Department of Building Service Engineering and Process Engineering

DSc

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72
Publications
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437
Citations

Publications

Publications (72)
Article
Different options to reduce the energy demand of a pressure-swing distillation process for separating the maximum-boiling azeotropic mixture water (A)-ethylenediamine (B) are studied by rigorous simulation. The total annualised cost (TAC) without any energy demand reduction option is minimised by a genetic algorithm coupled to a flow-sheet simulato...
Article
Increasing the processing capacity is important, especially in the pharmaceutical industry, where a given amount of waste solvent must be processed in a specific time period, else the remaining amount of waste solvent must be incinerated, which results in organic solvent loss and considerable environmental impact. In this paper, the possibility of...
Article
Full-text available
The recovery of acetone from an aqueous industrial waste solvent mixture containing a small amount of dichloromethane is studied. This separation can be performed in a single, large enough batch distillation column. When the amount of the waste solvent mixture increases and exceeds the processing capacity of this column, either the excess of solven...
Article
Full-text available
The distillation separation technology of an existing second-generation bioethanol production plant is investigated by simulation with a professional the flowsheet simulator. The plant contains three distillation columns in series with increasing pressure. Our aim is to compare different Heat Integration (HI) possibilities for the reduction of exte...
Article
Batch distillation (BD) has much higher energy demand than continuous distillation (CD). Different semi-batch distillation (SBD) policies, by which one part of the feed is continuously fed into a batch column, are investigated and optimised to minimise the energy demand. SBD has the advantage, that contrary to the batch distillation (BD), the liqui...
Article
The dehydration of isopropanol (B) from a mixture containing methyl ethyl ketone (A) and toluene (E) as pollutants by batch heteroazeotropic distillation (BHAD) is studied by dynamic simulation. The water (C) content of the feed is much lower than that of the BC azeotrope. Isopropanol can be obtained by conventional batch distillation under high re...
Article
Dehydration of isopropanol applying batch heteroazeotropic distillation with toluene as entrainer (E) is investigated. The composition of the feed is near to that of the isopropanol (A)-water (B) azeotrope. The effects of recycling the entrainer and the off-cut are studied by dynamic simulation with a professional flow-sheet simulator. Three consec...
Article
Extractive distillation processes enable the separation of non-ideal mixtures, including min-imum or maximum boiling azeotropes and low relative volatility mixtures. Unlike azeotropicdistillation, the entrainer fed at another location than the main mixture induces an extrac-tive section within the column. A general feasibility criterion shows that...
Article
Fluid distributors are widely used in various industrial and ventilation applications. For the appropriate design of such distributors, the discharge coefficient has to be known to predict the energy and fluid distribution performance. Despite the vast amount of experimental data published, no generally applicable equations are available. Therefore...
Chapter
The batch heteroazeotropic distillation (BHAD) separation of a minimum boiling azeotropic mixture (isopropyl alcohol(A) – water(B)) with toluene as entrainer(E) is simulated and optimized with GA. The production cycle consists of processing three consecutive batches. Both BHAD operational modes (sequential (Mode I) and simultaneous (Mode II) distil...
Conference Paper
Distillation is one of the most widely used separation methods in the chemical industry in spite of its very high energy demand. A great number of attempts have been made to reduce the energy demand of distillation processes. One of them is the application of a mechanical heat pump technology (like vapour compression or vapour recompression) for di...
Conference Paper
Batch distillation is frequently applied for the separation of liquid mixtures with variable amount and composition. Semi-continuous distillation differs from the batch distillation in that one part of the feed is continuously fed during the distillation. The heating surface of the reboiler must be always covered by liquid. This determines a minimu...
Conference Paper
Pour le captage de CO2 la méthode la plus prometteuse est l’absorption chimique dans des solutions aqueuses des amines. Le solvant le plus fréquent qui est recyclé dans le système absorbeur-désorbeur, est la solution aqueuse de la monoéthanolamine (MEA). Cependant diéthanolamine (DEA) and méthyldiéthanolamine (MDEA) sont aussi considérées comme sol...
Conference Paper
L’influence du recyclage de la fraction intermédiaire (intercoupe) et de l’entraîneur ont été étudiés pour la distillation extractive discontinue (DED) par simulation dynamique. Le mélange à séparer est isopropanol-eau par diméthylsulfoxide comme entraîneur. Un cycle se compose de trois productions consécutives. Quatre politiques de conduite différ...
Conference Paper
For the capture of CO2, the most promising method is the chemical absorption in aqueous amine solutions. The most common solvent recycled in the absorber-stripper system is the aqueous monoethanolamine (MEA). However, other materials such as ammonia are also considered as potential suitable solvent. The reduction of the CO2 emission of a coal fired...
Article
The influence of entrainer (and off-cut) recycle are studied by dynamic simulation for a batch heteroazeotropic distillation (BHAD) process. For the dehydration of isopropanol, toluene is applied as entrainer(E). The production cycle consists of processing three consecutive batches. Both BHAD operational modes (sequential (Mode I) and simultaneous...
Article
For the capture of CO2 the most promising method is chemical absorption in aqueous amine solutions. The most common solvent recycled in the absorber-stripper system is aqueous monoethanolamine (MEA). However other amines such as diethanolamine (DEA) and methyldiethanolamine (MDEA) are also considered as potential suitable solvents. The reduction by...
Chapter
Two batch extractive distillation (BED) separation of two minimum boiling azeotropic mixtures (acetone − methanol + water as entrainer, isopropyl alcohol − water + DMSO) are simulated and optimized with GA. Production series consist of three consecutive batches. Both off-cuts are recycled to the next charge. The entrainer regenerated is also reused...
Chapter
The recovery of methanol from an industrial waste solvent mixture (acetone (A) – methanol (B) – THF (C) –water (D) – toluene (E)) by batch (BD) and batch extractive distillation (BED) is optimised. A production cycle consists of six consecutive batches. The 1st fore-cut is incinerated; 2nd fore-cut, after-cut and hold-up are recycled to the next ba...
Article
Ventilation is important to maintain the indoor air quality and other comfort parameters in the occupied zone. The design of ventilation systems is based on one dimensional approach. When the air distribution is modelled in the ventilated space usually CFD simulation is performed and simplified boundary conditions are defined at the locations where...
Article
A simple 1D theoretical model is suggested, with which it is possible to design ventilation ducts that are capable of providing uniform air distribution on the outlets. Detailed analysis is conducted for rectangular ducts with constant height and variable width. Optimal geometry is described by the width profile. The non-linear differential equatio...
Conference Paper
The influence of off-cut and entrainer recycle are studied by dynamic simulation for a batch extractive distillation process. The mixture acetone-methanol is separated by using water as entrainer. The production cycle consists of processing three consecutive batches. The influence of preloading of the entrainer is also studied. The different operat...
Conference Paper
Full-text available
For the capture of CO2 the most promising method is the chemical absorption in aqueous amine solutions. The most common solvent recycled in the absorber-stripper system is the aqueous monoethanolamine (MEA). However other amines such as diethanolamine (DEA) and methyldiethanolamine (MDEA) are also considered as potential suitable solvents. The redu...
Article
A multiple step solvent recovery distillation process is optimized where the components form several azeotropes, and the off-cuts are recycled. Both conventional and extractive batch distillation are studied. The recovery of methanol from an industrial waste solvent mixture (acetone – methanol – tetrahydrofuran –water – toluene) is rigorously simul...
Article
The recovery of methanol by batch extractive distillation using water as entrainer from an azeotropic waste solvent mixture (acetone(A)-methanol(B)-THF(C)-water(D)-toluene(E)) is optimised by a genetic algorithm (GA) coupled with a professional flowsheet simulator performing the dynamic simulation. Optimization variables are the reflux ratios of th...
Article
Full-text available
A conveyor which transports fertilizer between buildings of a factory is simulated with computational fluid dynamics. Because of the hygroscopicity of the fertilizer it is necessary to avoid high relative humidity levels of the air surrounding; therefore the space is tempered with mechanical ventilation. Three principally similar but geometrically...
Conference Paper
For the capture of CO2 the most promising method is the chemical absorption in aqueous amine solutions. The most common solvent recycled in the absorber-stripper system is the aqueous monoethanolamine. The equilibrium model of the flow-sheet simulator is validated with vapour-liquid equilibrium measurement data. The simulation model created with a...
Conference Paper
Full-text available
The purification of an industrial wastewater containing sodium chloride and sodium sulphate with fractional crystallization is modelled. For the solid-liquid equilibrium calculations a free source software is used applying the Pitzer model for calculating the activity coefficients. Two technological versions are studied (without and with recycle of...
Article
The recovery of methanol from an industrial waste solvent mixture (acetone (A) - methanol (B) - THF (C)-water (D) - toluene (E)) by a batch (BD) and batch extractive distillation (BED) process was simulated and optimised. For both processes a production cycle consists of six consecutive batches. The first forecut is incinerated; the second fore-cut...
Article
Application of a heat pump system is a possibility for decreasing the high energy demand of distillation. The use of different working fluids for a vapor compression system for batch distillation is investigated. In this study working fluids are classified as “wet” and “dry” based on their behavior during the compression. The separation of a low re...
Chapter
Application of a heat pump system (HP) is a possibility for decreasing the energy demand of distillation. The separation of a low relative volatility mixture (n-heptane - toluene) by batch distillation with vapour compression (BD-VC) is investigated. The working fluids (WFs) studied are n-pentane, n-hexane and methanol, ethanol, iso-propanol. The c...
Chapter
The separation of a binary heteroazeotropic mixture (1-butanol - water) by batch distillation is studied in a new Double-Column System (DCS) by pilot plant experiments and dynamic simulation performed with a professional flowsheet simulator. The DCS is operated in closed mode. At the end of the process products of high purity were obtained with hig...
Article
The separation of a multicomponent azeotropic industrial waste solvent mixture by batch distillation (BD) and batch extractive distillation (BED) is studied. From a mixture methanol-THF-water-toluene methanol must be recovered in high purity. The optimization of both processes is performed by a genetic algorithm (GA) coupled with a professional flo...
Article
By extending our former model for batch heteroazeotropic distillation, a general model is developed for the batch heterogeneous extractive distillation. An entrainer-rich and an entrainer-lean phase are present in the decanter, where the holdup of both phases can be reduced, kept constant, or increased, thanks to batch operation mode. Any fraction...
Article
The recovery of methanol by batch distillation (BD) and batch extractive distillation (BED) from a multicomponent azeotropic waste solvent mixture (acetone-methanol-THF-water-toluene) is studied. The organic impurities are removed in two fore-cuts. Water as solvent is able to remove methanol from beside these impurities, thus reducing methanol loss...
Conference Paper
By extending our former model for batch heteroazeotropic distillation, a general model is developed for the batch heterogeneous extractive distillation (Fig. 1). An entrainer (E)-rich and an entrainer-lean phase are present in the decanter, where the hold-up of both phases can be reduced, kept constant, or increased. Any fraction of both phases can...
Article
A general model of batch heteroazeotropic distillation is proposed. Both liquid phases present in the decanter can be refluxed or withdrawn as distillate, their hold-up can be increased, decreased or kept constant, as well. By assuming maximal separation, that is, that the composition of the condensate always equals to that of the heteroazeotrope,...
Conference Paper
The influence of recycling off-cuts for the batch and batch extractive distillation separation of a four component (methanol- THF- water- toluene) waste solvent mixture of a pharmaceutical plant is studied by rigorous dynamic simulation. The evolution of the charge composition, of the amount of fresh feed and that of methanol product are determined...
Conference Paper
The recovery of methanol from a multicomponent aqueous waste solvent mixture was studied. The components form several minimum azeotropes, of which the methanol-THF and methanol-toluene azeotropes limit the recovery of methanol by traditional batch distillation (BD). THF and toluene are removed in the fore-cut, causing a significant loss of methanol...
Conference Paper
Operational and economic feasibility of different heat-pump systems with mechanical compression integrated to real batch distillation columns are investigated. This study is focused to the reduction of the external energy demand of the batch distillation. The separation of a low relative volatility mixture (n-heptane-toluene) is studied by rigorous...
Chapter
The wastewaters with high solvent concentrations cannot be fed to the treatment systems. Different scenarios for handling a wastewater containing acetone and methanol to remove and/or recover organic components are investigated by rigorous simulation. The extractive and pressure swing distillation processes are optimized by genetic algorithm (GA)....
Chapter
A general model of batch heteroazeotropic distillation is proposed. Both liquid phases present in the decanter can be refluxed or withdrawn as distillate, their hold-up can be increased, decreased or kept constant, as well. In this feasibility study maximal separation is assumed, that is, that the composition of the condensate always equals to that...
Chapter
A general model of batch heteroazeotropic distillation is proposed, in which both liquid phases present in the decanter can be refluxed or withdrawn as distillate, their hold-up can be increased, decreased or kept constant, as well. A feasibility study is performed with the assumption of maximal separation, that is, that the composition of the cond...
Conference Paper
The influence of the recycle of the off-cuts at the batch distillation regeneration of a four component (methanol- tetrahydrofuran - water- toluene) waste solvent mixture of a pharmaceutical plant is studied by rigorous dynamic simulation. The evolution of the charge composition, of the amount of fresh feed and that of the methanol product are dete...
Article
Different scenarios for handling wastewaters of different concentrations containing acetone and methanol (in equimolar quantities) in order to remove and/or recover organic components are investigated by rigorous simulation. The extractive and pressure swing distillation processes are optimized by genetic algorithm (GA). The different alternatives...
Conference Paper
The influence of the recycle of the off-cuts at the regeneration of a four component (methanol- THF- water- toluene) waste solvent mixture of a pharmaceutical plant is studied by rigorous dynamic simulation. The evolution of the charge composition, of the amount of fresh feed and that of methanol product are determined for 6 consecutive productions...
Article
We study the separation of the minimum homoazeotropic mixture isopropanol-water by applying cyclohexane and n-hexane as entrainer in a new Generalised Double-Column batch heteroazeotropic distillation System (GDCS). This configuration has three further operation parameters to the original Double-Column System (DCS; Denes et al. (2009) [1]). They gi...
Article
We study the separation of the minimum homoazeotrope isopropanol - water by applying cyclohexane as entrainer in a new Generalised Double-Column batch heteroazeotropic distillation System (GDCS). First its feasibility is studied by a simplified method then we did sensitivity analysis by rigorous simulation. The minimum duration is determined for th...
Article
Open and non-conventional closed batch column operation modes were compared by rigorous simulation. The configurations studied were the batch rectifier (“two vessel column”) and middle-vessel column (“three vessel column”). We simulated the separation of test mixtures (n-hexane-n-heptane and n-hexane-n-heptane-n-octane), and compared the recoveries...
Conference Paper
Full-text available
The performance of extractive (BED) and pressure swing distillation (PSBD) for the separation of the mixture acetone(A)-methanol(B) forming a minimum azeotrope are compared. For the BED, where the solvent(S) is water, three different operational policies (basic, modified, controlled) are studied. For the PSBD the double column batch stripper (DCBS)...
Article
Full-text available
In multicomponent azeotropic mixtures (e.g., waste solvents), the products obtainable by batch distillation and their maximal amount is highly dependent on the charge composition. A method is presented for the determination of product sequences for any number of components based only on the temperatures of pure components and azeotropes, and azeotr...
Conference Paper
Les performances de la politique de conduite originale et d’une politique modifiée de distillation extractive discontinue (DED) et du procédé hybride (PH, absorption+distillation) ont été étudiées expérimentalement et par simulation pour la récupération d’un solvant dans un déchet industriel de quatre solvants Les constituants (méthanol, THF, acéto...
Conference Paper
In multicomponent azeotropic mixtures (e.g. waste solvents), the products obtainable by batch distillation and their maximal amount is highly dependent on the charge composition. A method is presented for the determination of product sequences for any number of components based only on the boiling points of pure components and azeotropes, and azeot...
Conference Paper
Open and non-conventional closed batch column operation modes were compared by rigorous simulation. The configurations studied were the batch rectifier ("two vessel column"), middle- and multi-vessel column ("three and four vessel columns"). For the operation in closed system we studied six different modes differing in the operation of the vessels....
Conference Paper
In multicomponent azeotropic mixtures (e.g. waste solvents), the products obtainable by batch distillation and their maximal amount is highly dependent on the charge composition. A method is presented for the determination of product sequences for any number of components based only on the boiling points of pure components and azeotropes, and azeot...
Conference Paper
The performance of the basic and a modified operational policy of batch extractive distillation (BED) and the hybrid process (HP; absorption+distillation) for the recovery of tetrahydrofuran (THF) from a five-component industrial waste solvent mixture were investigated with laboratory experiments and rigorous simulations. The components (methanol,...
Conference Paper
Open and non-conventional closed batch column operation modes were compared with the CC-DCOLUMN dynamic flow-sheet simulator. With the models constructed, we simulated the separation of a test mixture (n-hexane-n-heptane), and compared the recoveries of different methods under constant energy consumption. We studied six different variants for the c...
Conference Paper
The performance of the basic and a modified operational policy of batch extractive distillation (BED) and hybrid process (HP) for the recovery of tetrahydrofuran (THF) from a waste solvent mixture (methanol, THF, acetonitrile, water, pyridine) was investigated. The production of THF with limited content of organic pollutants was infeasible with bat...
Conference Paper
The advantage of batch distillation over the continuous one – primarily in the separation of mixtures produced in small, varying quantities and compositions – are well-known. In the pharmaceutical industry, distilling industry, fine chemical production and solvent recovery distillation is mostly performed in batch mode. The batch rectifier is the o...
Article
Pressure-swing batch distillation in a double-column system is suggested for the separation of an acetone−methanol pressure-sensitive azeotropic mixture. The studied column configuration is the double-column batch stripper in open mode. We investigated this separation by rigorous simulation using a professional dynamic flow-sheet simulator. The inf...
Article
The pressure swing separation of a binary minimum azeotrope (n-pentane-acetone) in a double column batch stripper is studied by rigorous simulation. For controlling the product compositions a simple scheme is presented. On the basis of temperatures of bottoms product PID controllers manipulate their flow rates varying the reboil ratios. The control...
Conference Paper
Conventional and new batch column configurations and their different operation modes were compared with the CC-DCOLUMN professional dynamic flow-sheet simulator. We simulated the separation of test mixtures (n-hexane-n-heptane and n-hexane-n-heptane-n-octane), and compared the recoveries of different methods under constant energy consumption. The o...
Article
For heterogeneous batch distillation a new double column configuration operating in closed system is suggested. This configuration is investigated by feasibility studies based on the assumption of maximal separation and is compared with the traditional batch rectifier. The calculations are performed for a binary (n-butanol—water) and for a ternary...
Article
In this paper, optimisation of batch distillation processes is considered. It deals with real systems with rigorous simulation of the processes through the resolution full MESH differential algebraic equations. Specific software architecture is developed, based on the BatchColumn® simulator and on both SQP and GA numerical algorithms, and is able t...
Article
An algorithm and a FORTRAN program have been developed for modelling of crude distillation and vacuum columns on smaller computers. Wang-Henke and Sum of Rates methods are combined in a new way. The memory requirement is low even in the case of a great number of pseudocomponents. An atmospheric crude distillation column has been simulated. Crude oi...
Article
An useful engineering strategy is outlined connecting phase equilibrium experiments and modelling with pilot plant laboratory distillation and column calculations. The information content of experimental data on different properties are available and the role of planned experiments is discussed, together with an example of error propagation analysi...
Article
Adott szárítási és bepárlási művelet instacioner viselkedésének tanulmanyozására készítettünk matematikai modellt. A modell tartalmazza az átadási tényezőket. A modell alapján készítettük el a szimulációs programcsomagot. A szimulációs programmal folyamat optimálási, paraméter identifikálási feladatokat lehet végezni. Mérési módszert dolgoztunk ki...
Article
A fluid diszperz kolonnák (FDC) méretezéséhez szükséges a hidrodinamikai és anyagátadási tulajdonságok pontosabb megismerése. A kísérletek célja az FDC-ban a fázisok közötti anyagtranszport hatékonyságának a növelése. A különféle technológiai gázok, por mellett egyéb környezetvédelmi vagy műveleti szempontból káros komponenseket (pl. NH3, SO2, NOx)...
Article
A kutatás célja az azeotrop elegyek szétválasztására új szakaszos speciális desztillációs eljárások és konfigurációk kidolgozása, a meglévő eljárások tökéletesítése, optimalizálása ( energiahatékonyabb, környezetbarátabb eljárások kidolgozása) volt. Általános módszert dolgoztunk ki a szakaszos heteroazeotrop desztilláció (SZHAD) maradékgörbéinek és...

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Projects (3)
Project
To reduce energy requirement of distillation To optimization of the heat pump system