Andras Jozsef Toth

Andras Jozsef Toth
Budapest University of Technology and Economics · Department of Chemical and Environmental Process Engineering

PhD

About

200
Publications
46,305
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719
Citations
Introduction
Andras Jozsef Toth currently works at the Envrionmental and Process Engineering Research Group, Budapest University of Technology and Economics.
Additional affiliations
January 2016 - present
Budapest University of Technology and Economics
Position
  • Professor (Assistant)
Description
  • http://www.envproceng.eu/en/home-en/

Publications

Publications (200)
Article
In the chemical industry, a typical problem is the appropriate treatment of the process wastewaters. The biological treatment cannot be usually applied because of the high content of organochemical compounds. However, phsycicochemical methods can significantly contribute to the proper treatment of the process wastewater and usually also allows the...
Article
The motivation of the research is based on separation problem from fermentation industry, that is Acetone-Butanol-Ethanol solvent residue removal from its aqueous solutions. Pervaporation is a novel, promising technology for the separation of complex, azeotropic mixtures. Within pervaporation membrane category, organophilic pervaporation was invest...
Article
Full-text available
This work is motivated by a fine chemical industry task where n-propanol should be separated from its aqueous mixture. To accomplish this problem, the pervaporation process intends to apply PERVAP™ 1201 type dehydration membranes and to obtain information about the water removal from an aqueous mixture of n-propanol. Different evaluation parameters...
Article
Full-text available
Napjainkban az ivóvízhiány egyre nagyobb méreteket ölt, elsősorban a gyors népességnövekedés, az éghajlatváltozás, a pazarló túlhasználat és a szennyezés miatt. A jelenlegi körülmények között a világ lakosságának egynegyede nem jut jó minőségű ivóvízhez. Sőt, 2050-re a világ népességének fele, akár 5 milliárd ember is érintett lehet. Ezért más mego...
Article
Full-text available
In the fine chemical industries, especially in the pharmaceutical industry, production technology generates large amounts of liquid waste and industrial waste solvents. Separation of various organic substances used in industry, such as adsorbable organic halides (AOX), from industrial wastewater is an important task of environmental protection. In...
Article
Full-text available
The number of newly synthesized and produced organic chemicals has increased extremely quickly. However, the measurements of their physical properties, including their vapor−liquid equilibrium (VLE) data, are time-consuming. It so happens that there is no physical property data about a brand-new chemical. Therefore, the importance of calculating th...
Article
Full-text available
Chemical laboratories badly need efficient support for human works when experiments are carried out. Process control and data acquisition at the laboratory scale are still practical challenges among others, due to equipment prices and the relative complexity of the different scientific disciplines. There is, however, a large demand recently for the...
Presentation
MTA Chemical Unit and Mechanical Working Committee and MKE Technical Chemistry Professional Meeting, Budapest, Hungary, 8 February 2022
Article
Full-text available
The controllability study is an integral part of chemical process design. In this work, the controllability of two special distillation techniques, extractive distillation and pressure swing distillation, designed for the separation of azeotropic mixtures is investigated with dynamic tools. The control design interface of Aspen Plus and Matlab are...
Article
Full-text available
In the COVID-19 pandemic period, the role of face masks is critical as a protective physical barrier to prevent droplets and filtrate exhalations coming from infected subjects or against various environmental threats, including the SARS-Cov-2 virus. However, the plastic and microplastic waste from the used face masks pollute the environment, cause...
Article
Full-text available
Nowadays, desalination continues to expand globally, which is one of the most effective solutions to solve the problem of the global drinking water shortage. However, desalination is not a fail-safe process and has many environmental and human health consequences. This paper investigated the desalination procedure of seawater with different technol...
Article
Full-text available
The fine chemical and pharmaceutical industries use large amounts of various organic solvents in their manufacturing processes. By reusing them, production costs can be significantly reduced. If we can regenerate waste solvent mixtures, we have the opportunity to reuse them in the production process or in other production processes. Our study illus...
Article
This work aims to improve the synthesis of renewable hydrochar (HC) co-fired with coal to reduce grenhouse gas (GHG) emission. Acetic acid catalyzed hydrothermal carbonization (cHTC) of Chlorella vulgaris microalgae biomass was investigated based on a 3³⁻¹ fractional statistical design of the experiment to examine the effects of hydrothermal reacti...
Article
Full-text available
Global warming and climate change urge the deployment of close carbon-neutral technologies via the synthesis of low-carbon emission fuels and materials. An efficient intermediate product of such technologies is the biomethanol produced from biomass. Microalgae based technologies offer scalable solutions for the biofixation of CO2, where the produce...
Article
Full-text available
The hybrid distillation-pervaporation process is an efficient method for the removal or recovery of volatile organic compounds from their aqueous mixtures. The hybrid distillation-pervaporation process has not only shown its excellent performance in the purification of solvent mixtures but also proven to have a potential of saving energy. In this s...
Poster
The chemical process design always includes the controllability investigation of the different design alternatives. An old-new energy integrated alternative for the reduction of the energy consumption of distillation column is the so called dividing-wall columns. There are some new structures where the dividing wall is positioned to the lower or th...
Article
Full-text available
Acetaldehyde diethyl acetal (herein called acetal) is an important pollutant of anhydrous ethanol. Isobaric vapor−liquid equilibrium (VLE) of an ethanol−acetal binary system was measured using a vapor condensate and liquid circulation VLE still. The experimental data were correlated with Wilson, nonrandom two-liquid (NRTL), and universal quasichemi...
Article
Full-text available
Encouraged by the industrial problem of removing water from methanol solutions, a simple exfoliation method is applied to prepare polyvinyl alcohol (PVA)/laponite nanoclay mixed matrix membranes (MMMs). The membranes are used for the pervaporative dehydration of the methanol-water solution. The influence of the nanoclay content on the pervaporation...
Article
Full-text available
Separating non-ideal mixtures by pervaporation (hence PV) is a competitive alternative to most traditional methods, such as distillation, which are based on the vapour-liquid equilibrium (VLE). It must be said, in many cases, accurate VLE data are already well known in the literature. They make the method of PV modelling a lot more complicated, and...
Article
Full-text available
The exfoliation method was applied for the preparation of high-water selective mixed matrix membranes (MMMs), especially for the dehydration of C1−C3 alcohol−water solutions. Herein, a facile and easy method was employed to fabricate physically cross-linked Laponite nanosilicate clay−PVA MMMs without additional cross-linking by a one-step synthesis...
Article
Full-text available
It can be stated that in the fine chemical industries, especially in the pharmaceutical industry, large amounts of liquid waste and industrial waste solvents are generated during the production technology. Addressing these is a key issue because their disposal often accounts for the largest proportion of the cost of the entire technology. There is...
Article
Pervaporation is a separation method that is considered as green technology because of its low energy consumption. The mechanism of component separation in a liquid mixture by pervaporation is complex but it can be explained with the solution-diffusion mechanism. The work is motivated by an industrial separation problem, that is, ethyl acetate remo...
Article
Full-text available
Nowadays, there is increasing interest in advanced simulation methods for desalination. The two most common desalination methods are multi-stage flash distillation (MSF) and reverse osmosis (RO). Numerous research works have been published on these separations, however their simulation appears to be difficult due to their complexity, therefore cont...
Article
Full-text available
Do Thi Huyen Trang, Tóth András József: Ipari hulladékvizek kezelése hibrid eljárással: desztilláció és hidrofil pervaporáció, MASZESZ Hírcsatorna, 3, 2020, pp. 40–49. Megállapítható, hogy a finomkémiai iparokban, főként a gyógyszeriparban a gyártástechnológia során nagy mennyiségű folyékony hulladék, illetve ipari hulladékoldószer keletkezik. Eze...
Article
Full-text available
Efficient processes save natural resources, e.g. chemicals, energy carriers. The Extractive Heterogeneous Azeotropic Distillation (EHAD) is an efficient, novel process for the separation of highly non-ideal liquid mixtures. On the one hand, it consumes less energy than any other separation process and on the other hand the separated compounds of hi...
Article
In chemical recipes there can be found guidelines for efficient chemical production typically based on chemistry. However, such guidelines have never been checked with engineering methodologies for the sake of sustainability. A methodology is presented here on the case study problem of Grignard reagent production using tetrahydrofuran (THF) as solv...
Article
Full-text available
There are different factors and indices to characterize the performance of a pervaporation membrane, but none of them gives information about their capabilities in the area of liquid separation compared to the most convenient alternative, which is distillation. Membrane flash index (MFLI) can be considered the first and only one that shows if the m...
Article
Thermal crosslinking sequential method applied for DN-PVAs generation efficiently. The swelling measurements investigated that the hydrophilicity of the membrane decreases because of the collaboration of the second thermal crosslinked PVA matrix. The dehydration performance of ethanol solution showed improved using the thermal crosslinked double ne...
Article
Full-text available
The study is motivated by the industrial problem from pharmaceutical industry, which is ethanol and methanol removal from process wastewater. To complete this goal hybrid method is investigated and optimized. Two distillation columns are sufficient for separation of alcohol-water mixture. Suitable water can be purified as bottom product of first co...
Article
The separation of non-ideal mixtures using distillation can be an extremely complex process and there continues to be a need to further improve these techniques. A new method which combines extractive heterogeneous-azeotropic distillation (EHAD) and hydrophilic pervaporation (HPV) for the separation of non-ideal ternary mixtures is demonstrated. Th...
Article
Laponite nanodiscs are low cost synthetic silicate clay with extreme hydrophilic behavior. Therefore, laponite can be used to enhance pervaporation membranes’ performance. Poly(vinyl alcohol), (PVA)/laponite pervaporation membranes were fabricated via simple exfoliation method of the nanoclay in the polymer solution followed by chemical crosslinkin...
Article
Full-text available
This study investigates enhanced biogas production via co-Hydrothermal gasification (co-HTG) of wet Chlorella vulgaris biomass and hydrochar (HC). Hydrothermal carbonization was applied to valorize struvite containing waste microalgae stream into solid bio-fuel with improved combustion properties. The effects of HC quality and mixing ratio are inve...
Article
Full-text available
The features of pervaporation are continuously improved with the production of more and more efficient membranes. In our present study, silver nanoparticles are in-situ generated in a poly (vinyl alcohol) using solution-casting in order to enhance its capability for pervaporation. The membrane is tested on the case study of ethanol dehydration by p...
Article
Full-text available
In this study, pervaporation (PV) was used as a great promise for freshwater production from high-salinity water. Laponite nanodisc/poly (vinyl alcohol) (PVA) membranes were produced by simple exfoliation method of the nanoclay in the polymer solution using glutaraldehyde (GA). The surface morphology of the produced membrane and the influence of th...
Book
https://www.interkonyv.hu/konyvek?konyvek=&ref=toth_hulladekgazdalkodas
Conference Paper
The research is motivated by an industrial problem, that is isopropanol (IPA) removal from pharmaceutical process wastewater. To complete the target hybrid treatment is investigated. Isopropanol dehydration with combination of distillation and hydrophilic pervaporation (PV) is used. The goal of this research is to rigorously model and optimize this...
Conference Paper
The work is motivated by an industrial problem, which is tetrahydrofuran removal from pharmaceutical process wastewater with extractive distillation. The goal of the research is to rigorously model and optimize this operation in professional flowsheet simulator environment based on adequate and consistent vapour-liquid equilibrium data. The number...
Article
Pervaporation (PV) has shown great promise in water desalination technology. In this work, Laponite XLG – Poly (vinyl alcohol) (PVA-Lap) mixed matrix membranes (MMMs) were fabricated to investigate the elaboration of desalination of high-salinity water by pervaporation. The influence of Laponite content on the morphology, chemical structure and hyd...
Article
Full-text available
Mentioned articles: [1] Eniko Haaz, Daniel Fozer, Tibor Nagy, Nora Valentinyi, Anita Andre, Judit Matyasi, Jozsef Balla, Peter Mizsey, Andras Jozsef Toth: Vacuum evaporation and reverse osmosis treatment of process wastewaters containing surfactant material: COD reduction and water reuse, Clean Technologies and Environmental Policy, 21/4, 2019, pp...
Article
The distillation based separation can be extremely complex if highly non-ideal mixtures are to be separated. In spite of different successfully applied unit operations there is always a possible way to improve the distillation technique and widen its toolbar. A novel improvement in this area is the development of the extractive heterogeneous-azeotr...
Article
In chemical laboratories there are always a permanent need to apply flexible, target oriented and efficient control solutions and data acquisition. Traditional equipment and methods utilized are however either time consuming or relatively expensive causing chemical laboratories often to be either not equipped with proper data acquisition and contro...
Article
Ethyl acetate and ethanol are important organic solvents in fine chemical industry, which form with water ternary minimum-boiling azeotrope and three binary azeotropes, including heterogeneous-azeotrope. In this article, different distillations and pervaporation methods are studied to separate sharply the ternary mixture. In the case of separation...
Article
In the separation industry the extractive heterogeneous-azeotropic distillation (EHAD) is a new and powerful innovation, that is capable of making the separation of highly non-ideal mixtures feasible and economical. In the last years there has been much attention paid to the separation of the minimum boiling homogeneous azeotropes. Although maximum...
Article
Full-text available
The problem of process wastewater arises not only in fine chemical industry, but also where water is used for washing. In these cases, surfactant material is given to the water, so its washing capability is enhanced. The used water contains surfactant material and dirt. It has high chemical oxygen demand (COD) resulting in serious environmental pro...
Conference Paper
Full-text available
Human excreta contains all the macroelements which are important for the soil, for example nitrogen, phosphorus and potassium. Although there are many ways of treating human excreta, composting is often regarded as the best solution because the final result of this treatment is valuable humus. However, human urine contains the most of the nutrients...
Article
Full-text available
In agriculture, the human urine could have been used as a natural fertilizer, although there are some problems with the direct utilization, such as the presence of micropollutants in urine, odour and storage of large volume of urine. Therefore, nutrients , such as nitrogen, can be recovered from urine. Continuous flow laboratory membrane reactor wa...
Article
In the course of the present study, the pervaporative dehydration of two ternary mixtures: ethanol/n-butanol/water and ethanol/ethyl acetate/water were investigated through hydrophilic polymer composite PERVAP 1210 membrane. The effects of temperature and the concentrations of water and organic components on permeation were studied through pervapor...