Open Access. Powered by Scholars. Published by Universities.®

Chemical Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

11766 Full-Text Articles 12397 Authors 1812408 Downloads 84 Institutions

All Articles in Chemical Engineering

Faceted Search

11766 full-text articles. Page 1 of 348.

Evolutionary View Planning For Optimized Uav Terrain Modeling In A Simulated Environment, Ronald A. Martin, Ivan Rojas, Kevin W. Franke, John Hedengren 2016 Brigham Young University

Evolutionary View Planning For Optimized Uav Terrain Modeling In A Simulated Environment, Ronald A. Martin, Ivan Rojas, Kevin W. Franke, John Hedengren

All Faculty Publications

This work demonstrates the use of genetic algorithms in optimized view planning for 3D reconstruction applications using small unmanned aerial vehicles (UAVs). The quality of UAV site models is currently highly dependent on manual pilot operations or grid-based automation solutions. When applied to 3D structures, these approaches can result in gaps in the total coverage or inconsistency in final model resolution. Genetic algorithms can effectively explore the search space to locate image positions that produce high quality models in terms of coverage and accuracy. A fitness function is defined, and optimization parameters are selected through semi-exhaustive search. A novel simulation ...


Delay-Independent Stability Analysis Of Linear Time-Delay Systems Based On Frequency, Xianwei Li, Huijun Gao, Keqin Gu 2016 Harbin Institute of Technology

Delay-Independent Stability Analysis Of Linear Time-Delay Systems Based On Frequency, Xianwei Li, Huijun Gao, Keqin Gu

SIUE Faculty Research, Scholarship, and Creative Activity

This paper studies strong delay-independent stability of linear time-invariant systems. It is known that delay-independent stability of time-delay systems is equivalent to some frequency-dependent linear matrix inequalities. To reduce or eliminate conservatism of stability criteria, the frequency domain is discretized into several sub-intervals, and piecewise constant Lyapunov matrices are employed to analyze the frequency-dependent stability condition. Applying the generalized Kalman–Yakubovich–Popov lemma, new necessary and sufficient criteria are then obtained for strong delay-independent stability of systems with a single delay. The effectiveness of the proposed method is illustrated by a numerical example.


Design Of A Conditioner For Smoothing Wind Turbine Output Power, Murali Bottu, Mariesa Crow, A. Curt Elmore 2016 Missouri University of Science and Technology

Design Of A Conditioner For Smoothing Wind Turbine Output Power, Murali Bottu, Mariesa Crow, A. Curt Elmore

Mariesa Crow

As a result of wind speed intermittency, highly variable wind power output can adversely impact local loads. We propose a conditioner to smooth the variable wind power by utilizing the energy of an ultracapacitor. The conditioner is based on a single phase voltage source inverter (VSI) connected between the grid interconnection point and the ultracapacitor. The shunt VSI injects or absorbs active power from the line to smooth the wind power by utilizing the short term storage capabilities of the ultracapacitor. The ultracapacitor is connected to the DC link through a DC-DC converter, which maintains the voltage of the DC ...


Film Performance Of Poly(Lactic Acid) Blends For Packaging Applications, Carlos A. Diaz, HsunPao Y. Pao, Sungyoung Kim 2016 Rochester Institute of Technology

Film Performance Of Poly(Lactic Acid) Blends For Packaging Applications, Carlos A. Diaz, Hsunpao Y. Pao, Sungyoung Kim

Journal of Applied Packaging Research

Poly(lactic acid) (PLA), a biodegradable thermoplastic derived from renewable resources, stands out as a substitute to petroleum-based plastics. PLA based films for food packaging has been an area of both commercial and research interest within the context of sustainability. In spite of its high strength, packaging applications have been limited because PLA is more brittle than traditional oil-based plastics. Because of this, films display low tear and impact resistance and produce a loud crackling sound when manipulated. Although many studies address the toughening of PLA in the bulk, little attention has been placed on the film performance. The present ...


Occurrence Of Reverse Side Effects In Corona Treatment Of Dispersion-Coated Paperboard And Its Influence On Grease Barrier Properties, Sami-Seppo Ovaska, Ringaudas Rinkunas, Tadeusz Lozovksi, Robertas Maldzius, Jonas Sidaravicius, Leena-Sisko Johansson, Monika Österberg, Kaj Backfolk 2016 Lappeenranta University of Technology, Group of Packaging Technology

Occurrence Of Reverse Side Effects In Corona Treatment Of Dispersion-Coated Paperboard And Its Influence On Grease Barrier Properties, Sami-Seppo Ovaska, Ringaudas Rinkunas, Tadeusz Lozovksi, Robertas Maldzius, Jonas Sidaravicius, Leena-Sisko Johansson, Monika Österberg, Kaj Backfolk

Journal of Applied Packaging Research

The uncoated side of dispersion-barrier-coated paperboards was exposed to positive and negative direct current corona treatments in order to confirm the occurrence of backside treatment and clarify its effects on the usability of the paperboard. The main component of the coating dispersions was hydroxypropylated potato starch and the effects of talc and styrene-butadiene latex additions on backside treatment were evaluated. Coatings with a high talc proportion showed excellent initial grease resistance, but corona-induced strikethroughs caused a drastic decrease in grease penetration time. The root-mean-square roughness measurements revealed moderate surface roughening at the backside, indicating thus backside treatment. The alterations in ...


Phylogenetic And Experimental Characterization Of An Acyl-Acp Thioesterase Family Reveals Significant Diversity In Enzymatic Specificity And Activity, Fuyuan Jing, David C. Cantu, Jarmila Tvaruzkova, Jay P. Chipman, Basil J. Nikolau, Marna D. Yandeau-Nelson, Peter J. Reilly 2016 Iowa State University

Phylogenetic And Experimental Characterization Of An Acyl-Acp Thioesterase Family Reveals Significant Diversity In Enzymatic Specificity And Activity, Fuyuan Jing, David C. Cantu, Jarmila Tvaruzkova, Jay P. Chipman, Basil J. Nikolau, Marna D. Yandeau-Nelson, Peter J. Reilly

Basil Nikolau

Background: Acyl-acyl carrier protein thioesterases (acyl-ACP TEs) catalyze the hydrolysis of the thioester bond that links the acyl chain to the sulfhydryl group of the phosphopantetheine prosthetic group of ACP. This reaction terminates acyl chain elongation of fatty acid biosynthesis, and in plant seeds it is the biochemical determinant of the fatty acid compositions of storage lipids.

Results: To explore acyl-ACP TE diversity and to identify novel acyl ACP-TEs, 31 acyl-ACP TEs from wide-ranging phylogenetic sources were characterized to ascertain their in vivo activities and substrate specificities. These acylACP TEs were chosen by two different approaches: 1) 24 TEs were ...


Carbon Nanoadditives To Enhance Latent Energy Storage Of Phase Change Materials, Shadab Shaikh, Khalid Lafdi, Kevin P. Hallinan 2016 University of Dayton

Carbon Nanoadditives To Enhance Latent Energy Storage Of Phase Change Materials, Shadab Shaikh, Khalid Lafdi, Kevin P. Hallinan

Kevin Hallinan

Latent energy storage capacity was analyzed for a system consisting of carbon nanoparticlesdopedphase changematerials (PCMs). Three types of samples were prepared by doping shell wax with single wall carbon nanotubes(SWCNTs), multiwall CNTs, and carbon nanofibers. Differential scanning calorimetry was used to measure the latent heat of fusion. The measured values of latent heat for all the samples showed a good enhancement over the latent heat of pure wax. A maximum enhancement of approximately 13% was observed for the wax/SWCNT composite corresponding to 1% loading of SWCNT. The change in latent heat was modeled by using an approximation for ...


Scale-Up Effects Of Co2 Capture By Methylethanolamine (Mdea) Solutions In Terms Of Loading Capacity, João F. Gomes 2016 Instituto Superior Engenharia Lisboa

Scale-Up Effects Of Co2 Capture By Methylethanolamine (Mdea) Solutions In Terms Of Loading Capacity, João F. Gomes

João F Gomes

No abstract provided.


Oxygen/Steam Charcoal Gasification In A Fluidized Alumina Bed, Rui Moreira, Rui Vaz, António Portugal, Noemí Gil-Lalaguna, Fernando Bimbela, José Luis Sánchez 2016 University of Coimbra, Portugal

Oxygen/Steam Charcoal Gasification In A Fluidized Alumina Bed, Rui Moreira, Rui Vaz, António Portugal, Noemí Gil-Lalaguna, Fernando Bimbela, José Luis Sánchez

5th International Congress on Green Process Engineering (GPE 2016)

Mixtures of oxygen and steam were used as gasifying agents to produce a gas stream with high hydrogen content. The effects of the equivalence ratio (ER) and steam to carbon ratio (S/C) on gasification performance were studied at 900 ºC. The highest hydrogen yield (0.412 Nm3/kg charcoal) and apparent energy efficiency (33.43%) were achieved using a mixture that had a S/C ratio of 0.625 and an ER equal to 0.3 (pure oxygen). The results showed that the carbon conversion improved when the ER and the S/C ratio were augmented, and that ...


Wet Air Oxidation For Industrial Wastewater And Sludge Treatment: First Results Of A New Research Program In Quebec, Jean-François Vermette, Sophie Girard, Patrick Desjardins 2016 Centre de transfert technologique en écologie industrielle

Wet Air Oxidation For Industrial Wastewater And Sludge Treatment: First Results Of A New Research Program In Quebec, Jean-François Vermette, Sophie Girard, Patrick Desjardins

5th International Congress on Green Process Engineering (GPE 2016)

Introduction

Sub-critical water technologies, in particular wet air oxidation (WAO), have been developing across Europe in recent decades. This process is now used at the industrial scale for the effective treatment of wet organic material, mainly sludge from wastewater treatment plants (WWTP), and is done with energy self-sufficiency [1, 2]. In WAO, hot pressurised water (200-350 ˚C, 30-200 bars) is enriched with oxygen or air to initiate exothermic oxidation of organic material, mostly into CO2 and H2O. Since the operating temperature is much lower than typical incineration, no gaseous emissions of NOX, dioxins or furans are ...


How To Reduce The Energy Costs Of Food And Dairy Products To Spray Drying?, Pierre Schuck, Anne Dolivet, Serge Méjean, Romain Jeantet 2016 Inra Agrocampus-Ouest UMR 1253, Rennes, France

How To Reduce The Energy Costs Of Food And Dairy Products To Spray Drying?, Pierre Schuck, Anne Dolivet, Serge Méjean, Romain Jeantet

5th International Congress on Green Process Engineering (GPE 2016)

The most frequently used technique for dehydration of dairy products is spray drying. This is an effective method to preserve biological products as it does not involve prolong exposure of materials to severe heat treatment. Due to the variety and complexity of the concentrates to be dried, a more rigorous understanding of spray-drying based on physico-chemical and thermodynamic properties is necessary. At the same time, the current state of the art did not allow easy determination of the parameters of spray-drying of dairy products prior to drying, except from performing several complex and expensive experiments with pilot-scale spray-dryer. Nevertheless, recent ...


Development Of A Mobile 100 Kg/H Plant For Pyrolysis Using A Mechanically Fluidized Reactor, Dhiraj Kankariya, Stefano Tacchino, Dominic Pjontek, Franco Berruti, Cedric Briens 2016 Western University

Development Of A Mobile 100 Kg/H Plant For Pyrolysis Using A Mechanically Fluidized Reactor, Dhiraj Kankariya, Stefano Tacchino, Dominic Pjontek, Franco Berruti, Cedric Briens

5th International Congress on Green Process Engineering (GPE 2016)

Current pyrolysis processes perform the thermal decomposition of biomass into a liquid bio-oil, bio-char and non-condensable gases, at around 500 °C, without the addition of oxygen gas. The bio-oil is a complex mixture of many components that is used either as a substitute for fuel oil or for applications such as liquid smoke and bio-phenol resins that do not require pure chemicals.

The large-scale mechanical fluidized reactor (MFR) is a new technology for the pyrolysis of biomass developed by ICFAR, which does not require a sand bed and, thus, provides an undiluted solid char residue, which is essential to realize ...


Integrating Batch Pyrolysis And Fractional Condensation (2d Mfr) To Get High-Value Products From Biomass, Mohammad Hossain, Chiara Barbiero, Ian Scott, Franco Berruti, Cedric Briens 2016 ICFAR – Western University

Integrating Batch Pyrolysis And Fractional Condensation (2d Mfr) To Get High-Value Products From Biomass, Mohammad Hossain, Chiara Barbiero, Ian Scott, Franco Berruti, Cedric Briens

5th International Congress on Green Process Engineering (GPE 2016)

Agricultural crop residues are a source of inexpensive biomass to convert into bioproducts. The recovery of valuable chemicals from plant waste would partly solve the disposal issue and offer a more environmentally friendly alternative to synthetic chemical production. One approach to separate and concentrate valuable chemicals from biomass is pyrolysis using a batch reactor process. A mechanically fluidized reactor (MFR) was developed to pyrolyze biomass from ambient to temperatures near 600 °C, forming gases that are then condensed in an ice-chilled condenser to form a bio-oil. The bio-oil produced by the MFR can be separated within temperature ranges, termed one-dimensional ...


Microwave Assisted Pyrolysis Of Kraft Lignin At Reduce Pressure In A Multimode Oven, Mattia Bartoli, Marco Frediani, Luca Rosi, Piero Frediani 2016 Department of Chemistry, University of Florence, Via della lastruccia, Italy

Microwave Assisted Pyrolysis Of Kraft Lignin At Reduce Pressure In A Multimode Oven, Mattia Bartoli, Marco Frediani, Luca Rosi, Piero Frediani

5th International Congress on Green Process Engineering (GPE 2016)

Lignin is the third-most abundant natural polymer after cellulose and hemicellulose[1] and the only renewable source of aromatics in nature. Moreover lignin is the most relevant waste from industry of paper and bioethanol[2]. Nowadays the common way to dispose it is combustion but the possibility to recovery aromatic moiety from thermochemical conversion of lignin has been received a grown attention. In this field the most promising approach is pyrolysis[3] and particularly interesting is use of microwave (MW) like heating source[4]. Microwave assisted pyrolysis (MAP) was successfully applied in the treatment of plastic materials[5, 6] and ...


Technological Breakthrough And Innovation In The Production Of Whey Powders, With 30-40% Reduction In Energy Costs, Pierre Schuck, Anne Dolivet, Serge Méjean, Gaelle Tanguy, Daniel Garreau, Corrado Vezzani, Romain Jeantet 2016 Inra Agrocampus-Ouest UMR 1253, Rennes, France

Technological Breakthrough And Innovation In The Production Of Whey Powders, With 30-40% Reduction In Energy Costs, Pierre Schuck, Anne Dolivet, Serge Méjean, Gaelle Tanguy, Daniel Garreau, Corrado Vezzani, Romain Jeantet

5th International Congress on Green Process Engineering (GPE 2016)

There are two essential stages in the elimination of water for the production of whey and permeate powders: concentration by vacuum evaporation followed by spray drying. These two operations alone represent 25% of the energy consumed by the French dairy industry, the major part of which is due to the drying stage. Indeed, 96.7% of the whey water is removed during the vacuum evaporation/concentration stage, whereas drying, which removes only 3.3% of the water, requires 31% of the total energy used over the entire process.

One possible way to reduce energy consumption would be for the product ...


Bio-Oils From Microwave Assisted Pyrolysis Of Cellulose Using A Multi Mode Batch Reactor, Marco Frediani, Piero Frediani, Luca Rosi, Mattia Bartoli 2016 Department of Chemistry, University of Florence, Via della lastruccia, Italy

Bio-Oils From Microwave Assisted Pyrolysis Of Cellulose Using A Multi Mode Batch Reactor, Marco Frediani, Piero Frediani, Luca Rosi, Mattia Bartoli

5th International Congress on Green Process Engineering (GPE 2016)

The end of fossil fuels era is becoming day by day [1] however the request of raw materials and fuels from industry is growing every year [2]. As a consequence research for renewable resource to supply oil is became very attractive [3]. Biomasses are very promising sources to satisfy the growing request of energy and raw materials [4-6] and in the same time to reduce the environmental impact due to their production [7]. Cellulose is particular interesting among different available biomasses because it is not interfere with the availability of resource for alimentation [8]. It is the main component of ...


Catalytic Property Of Olivine For Bio-Oil Gasification, Mohammad Latifi, Franco Berruti, Cedric Briens 2016 ICFAR - Western University, Canada

Catalytic Property Of Olivine For Bio-Oil Gasification, Mohammad Latifi, Franco Berruti, Cedric Briens

5th International Congress on Green Process Engineering (GPE 2016)

Introduction

Biomass is an attractive renewable source of fuel and energy. Thermochemical processes can convert biomass to a liquid bio-oil or to a syngas. The advantage of using bio-oil as an intermediate is that, in contrast with both raw biomass and gas, it can easily be produced in small distributed units, stored and transported. Not only can platform chemicals and clean fuels be produced from syngas, but hydrogen is itself an alternative fuel. A high hydrogen production is usually desired: for example, methanol production requires a syngas with a molar H2/CO ratio of 2. Therefore, maximum hydrogen production ...


Production Of Glycerol 1,2-Carbonate From Glycerol With Aid Of Ionic Liquid As Catalyst, Nor Asrina Sairi, Zati Ismah, Yatimah Alias, Rozita Yusoff, Mohamed Kheireddine Taieb Aroua, 2016 University of Malaya

Production Of Glycerol 1,2-Carbonate From Glycerol With Aid Of Ionic Liquid As Catalyst, Nor Asrina Sairi, Zati Ismah, Yatimah Alias, Rozita Yusoff, Mohamed Kheireddine Taieb Aroua,

5th International Congress on Green Process Engineering (GPE 2016)

The surplus formation of glycerol (glycerine or 1,2,3-propanetriol) during biodiesel production has led to a major concern. Glycerol price has dropped and it exerts a great impact on the refined glycerol market. This has triggered an extensive research focus to find an innovative way to revalorize glycerol and transform to value-added chemicals. Yet, it is undeniably a necessary move towards achieving greener and sustainable processes. For instance, glycerol 1,2-carbonate (4-hydroxymethyl-1, 3-dioxolan-2-one) is currently one of the most celebrated glycerol derivatives that captured arising scientific and industrial attentions due to its extensive potential applicability. This cyclic ester of ...


Development And Industrial Application Of Novel Non-Cr Passivity For Electrolytic Manganese, Siming Chen, Dongping Duan, E Zhou, Ting Li 2016 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, CAS, China

Development And Industrial Application Of Novel Non-Cr Passivity For Electrolytic Manganese, Siming Chen, Dongping Duan, E Zhou, Ting Li

5th International Congress on Green Process Engineering (GPE 2016)

No abstract provided.


Sox Trapping Performances Of Cuo Based Silica Mesoporous Adsorbents For Desulfurization Of Industrial Flue Gas Stream, Sophie Dorge, Marc Berger, Habiba Nouali, Laure Michelin, Ludovic Josien, Matthieu Vierling, Michel Molière, Emmanuel Fiani, David Habermacher, Joël Patarin, Jean-François Brilhac, Pierrick Gaudin 2016 Université de Haute Alsace, France

Sox Trapping Performances Of Cuo Based Silica Mesoporous Adsorbents For Desulfurization Of Industrial Flue Gas Stream, Sophie Dorge, Marc Berger, Habiba Nouali, Laure Michelin, Ludovic Josien, Matthieu Vierling, Michel Molière, Emmanuel Fiani, David Habermacher, Joël Patarin, Jean-François Brilhac, Pierrick Gaudin

5th International Congress on Green Process Engineering (GPE 2016)

In the present work, CuO/SBA-15 SOx regenerable adsorbents were elaborated. Synthesis conditions were controlled in order to obtain highly dispersed Cu2+ species assumed to be Cu-O-Si species. Materials were evaluated as SOx adsorbents through multicycle adsorption/regeneration experiments. Their performances decrease along cycles due to copper species sintering and there is an optimal copper loading for a maximal SOx adsorption efficiency.

Please click Additional Files below to see the full abstract.


Digital Commons powered by bepress