The Experts below are selected from a list of 19572 Experts worldwide ranked by ideXlab platform
P A Schneide - One of the best experts on this subject based on the ideXlab platform.
-
a physical description of solids transport in flighted rotary dryers
Powder Technology, 2006Co-Authors: P F Itto, Madoc Sheeha, P A SchneideAbstract:In this paper, a solids transport model for flighted rotary dryers is presented. Emphasis is placed on combining statistical and mechanistic modelling efforts to create a physically motivated compartment model involving pairs of perfectly mixed tank reactors linked in a series arrangement. Here, each tank pair, or cell, aims to physically describe a finite slice of a case study industrial rotary Sugar dryer, and is hence governed primarily by flight geometry and dryer operational variables such as rotational speed and dryer inclination. Solids flow paths are structured to properly represent the different modes of transport in the rotary dryer, and values of transport coefficients are based on calculated rates of rotational and axial flows. A solids dispersion variable is used to correlate the model residence time distribution (RTD) prediction with available data from a tracer study conducted during industrial operation of a full-scale Raw Sugar dryer. RTD results from the model show intuitive responses to variations in solids feed rate, rotational speed and drum inclination.
-
solids transport in rotary Sugar dryers
Lee A. Sheenan M.E. and Schneider P.A. (2004) Solids transport in rotary sugar dryers. In: 26th Annual Conference Australian Society of Sugar Cane Tec, 2004Co-Authors: Andrew Lee, Madoc Sheeha, P A SchneideAbstract:ROTARY drum Sugar drying is the last important unit operation used in the manufacture of Raw Sugar. In order to improve their de sign, operation and control, it is helpful to model their dynamic behaviour. One important aspect involves predicting the rate at which solids are conveyed through the dryer, so that hold-up of crystalline material can be better predicted. It is also important to accurately predict the amount of Sugar presented to the oncoming air stream in the falling curtain, so that meaningful heat and mass transfer relations can be developed. This paper presents a dynamic model of solids transport through a rotary Sugar dryer. The model is developed by assuming a tanks-in- series/parallel arrangement, akin to chemical reaction engineering systems. The use of two tanks connected in parallel allows the separation of Sugar undergoing drying from the Sugar particles at rest in the flights. This approach allows the prediction of air phase and rolling Sugar hold-up, and residence time distribution within the dryer. Correlations to account for overloaded dryers and the imp act of airflow are included. The model is based on a tracer study performed on a 100 t/h industrial dryer.
-
modelling the dynamics of solids transport in flighted rotary dryers
Computer-aided chemical engineering, 2003Co-Authors: P A Schneide, Madoc SheehaAbstract:This paper proposes a simple dynamic solids transport model for flighted rotary dryers, which results by discretising the dryer in the axial direction into a series of equivolume elements. Each resultant element is partitioned into two zones; one active and the other passive. Solids interchange between the active and passive zones is included, leading to a tanks-in-series/parallel approach, traditionally used by reaction engineers. Modelling solids transport in this manner allows the residence time distribution (RTD) characteristics of the rotary dryer to be elucidated. In this work gPROMS is used to simulate the proposed rotary dryer model. Data from a 100 tonne per hour Raw Sugar dryer is reconciled against the dynamic solids transport model, by estimating overall solids transport coefficients.
Madoc Sheeha - One of the best experts on this subject based on the ideXlab platform.
-
a physical description of solids transport in flighted rotary dryers
Powder Technology, 2006Co-Authors: P F Itto, Madoc Sheeha, P A SchneideAbstract:In this paper, a solids transport model for flighted rotary dryers is presented. Emphasis is placed on combining statistical and mechanistic modelling efforts to create a physically motivated compartment model involving pairs of perfectly mixed tank reactors linked in a series arrangement. Here, each tank pair, or cell, aims to physically describe a finite slice of a case study industrial rotary Sugar dryer, and is hence governed primarily by flight geometry and dryer operational variables such as rotational speed and dryer inclination. Solids flow paths are structured to properly represent the different modes of transport in the rotary dryer, and values of transport coefficients are based on calculated rates of rotational and axial flows. A solids dispersion variable is used to correlate the model residence time distribution (RTD) prediction with available data from a tracer study conducted during industrial operation of a full-scale Raw Sugar dryer. RTD results from the model show intuitive responses to variations in solids feed rate, rotational speed and drum inclination.
-
solids transport in rotary Sugar dryers
Lee A. Sheenan M.E. and Schneider P.A. (2004) Solids transport in rotary sugar dryers. In: 26th Annual Conference Australian Society of Sugar Cane Tec, 2004Co-Authors: Andrew Lee, Madoc Sheeha, P A SchneideAbstract:ROTARY drum Sugar drying is the last important unit operation used in the manufacture of Raw Sugar. In order to improve their de sign, operation and control, it is helpful to model their dynamic behaviour. One important aspect involves predicting the rate at which solids are conveyed through the dryer, so that hold-up of crystalline material can be better predicted. It is also important to accurately predict the amount of Sugar presented to the oncoming air stream in the falling curtain, so that meaningful heat and mass transfer relations can be developed. This paper presents a dynamic model of solids transport through a rotary Sugar dryer. The model is developed by assuming a tanks-in- series/parallel arrangement, akin to chemical reaction engineering systems. The use of two tanks connected in parallel allows the separation of Sugar undergoing drying from the Sugar particles at rest in the flights. This approach allows the prediction of air phase and rolling Sugar hold-up, and residence time distribution within the dryer. Correlations to account for overloaded dryers and the imp act of airflow are included. The model is based on a tracer study performed on a 100 t/h industrial dryer.
-
modelling the dynamics of solids transport in flighted rotary dryers
Computer-aided chemical engineering, 2003Co-Authors: P A Schneide, Madoc SheehaAbstract:This paper proposes a simple dynamic solids transport model for flighted rotary dryers, which results by discretising the dryer in the axial direction into a series of equivolume elements. Each resultant element is partitioned into two zones; one active and the other passive. Solids interchange between the active and passive zones is included, leading to a tanks-in-series/parallel approach, traditionally used by reaction engineers. Modelling solids transport in this manner allows the residence time distribution (RTD) characteristics of the rotary dryer to be elucidated. In this work gPROMS is used to simulate the proposed rotary dryer model. Data from a 100 tonne per hour Raw Sugar dryer is reconciled against the dynamic solids transport model, by estimating overall solids transport coefficients.
P F Itto - One of the best experts on this subject based on the ideXlab platform.
-
a physical description of solids transport in flighted rotary dryers
Powder Technology, 2006Co-Authors: P F Itto, Madoc Sheeha, P A SchneideAbstract:In this paper, a solids transport model for flighted rotary dryers is presented. Emphasis is placed on combining statistical and mechanistic modelling efforts to create a physically motivated compartment model involving pairs of perfectly mixed tank reactors linked in a series arrangement. Here, each tank pair, or cell, aims to physically describe a finite slice of a case study industrial rotary Sugar dryer, and is hence governed primarily by flight geometry and dryer operational variables such as rotational speed and dryer inclination. Solids flow paths are structured to properly represent the different modes of transport in the rotary dryer, and values of transport coefficients are based on calculated rates of rotational and axial flows. A solids dispersion variable is used to correlate the model residence time distribution (RTD) prediction with available data from a tracer study conducted during industrial operation of a full-scale Raw Sugar dryer. RTD results from the model show intuitive responses to variations in solids feed rate, rotational speed and drum inclination.
Ingrid Schmidt-hebbel Martens - One of the best experts on this subject based on the ideXlab platform.
-
Produção, purificação, caracterização e viabilidade de aplicação da dextranase de penicillium SP
2017Co-Authors: Ingrid Schmidt-hebbel MartensAbstract:Resumo: Oitocentas e sessenta e três linhagens de fungos foram isoladas do solo de plantações de cana de açúcar, assim como de varas de cana deterioradas, e testadas quanto ã atividade dedextranase. Nesta seleção, foi encontrada uma linhagem de Penicillium sp que produz alta atividade de dextranase quando cultivada em meio líquido contendo dextrana como única fonte de carbono. Estudaram-se as condições ótimas de produção de dextrana se, quanto à fonte de carbono, de nitrogênio, concentração de dextrana no meio e temperatura de incubação. A dextranase foi produzida em fermentação submersa em meio contendo dextrana, farinha de soja desengordurada, extrato de leveduras, KH2P04 e MgS04.7H20 em pH 6,0 a 30ºC. A enzima bruta foi purificada através de cromatografia em coluna de DEAE-celulose e de CM-celulose. A caracterização da enzima mostrou que a temperatura ótima da dextranase é de 50ºC, e o ph ótimo de 4,2. A enzima se mantém estável a 40ºC durante 7 horas. O pH de estabilidade se encontra na faixa de pH 4,2 a 5,0. A dextranase de Penicillium sp é fortemente inibida por íons Ag+, Mn2+, F2+ e Hg2+. Na hidrólise da dextrana a enzima .libera, isomaltose e isomaltotriose como produtos principais. Na aplicação da dextranase de Penicillium sp na hidrólise da dextrana em caldo de cana e em açúcar cristal, a mesma apresentou resultados satisfatóriosAbstract:Eight hundred and sixty three strains of fungi were isolated from cane Sugar fields and deteriorated cane Sugar and examined for production of dextranase. It was found a strain of Penieillium sp which has produced highest activity of dextranase when the strain was cultivated in liquid medium which contained dextran as toe sole carbon source. The optimal condition for dextranase production by the fungus was studied and found that dextranase was produced in submerged culture in medium containing dextran, 5g; defatted soy flour, 10g; yeast extract. 5g; KH2P04, 5g and MgS04.7H20, 2,5g in 1 liter, pH 6,0 at 30ºC. The crude enzyme was purified by DEAE-cellulose and CH cellulose column chromatograpoy. The enzyme was most active at pH 4,2, and the temperature optimum was near 50ºC. The dextianase was stable over a pH range from 4,2 - 5,0 at 40ºC for 7 hours. The enzyme was strongly inhibited by Ag+, Mn2+, Fe2+ and Hg2+ ions. The main hydrolysis products of dextran were glucose, isomaltose and isomaltotriose. The application of Penieillium sp dextranase in removing dextran from Raw cane Sugar juice and Raw Sugar showed satisfactory result
Martens, Ingrid Schmidt-hebbel - One of the best experts on this subject based on the ideXlab platform.
-
Produção, purificação, caracterização e viabilidade de aplicação da dextranase de penicillium SP
[s.n.], 2018Co-Authors: Martens, Ingrid Schmidt-hebbelAbstract:Orientador : Yong Kun ParkDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de AlimentosResumo: Oitocentas e sessenta e três linhagens de fungos foram isoladas do solo de plantações de cana de açúcar, assim como de varas de cana deterioradas, e testadas quanto ã atividade dedextranase. Nesta seleção, foi encontrada uma linhagem de Penicillium sp que produz alta atividade de dextranase quando cultivada em meio líquido contendo dextrana como única fonte de carbono. Estudaram-se as condições ótimas de produção de dextrana se, quanto à fonte de carbono, de nitrogênio, concentração de dextrana no meio e temperatura de incubação. A dextranase foi produzida em fermentação submersa em meio contendo dextrana, farinha de soja desengordurada, extrato de leveduras, KH2P04 e MgS04.7H20 em pH 6,0 a 30ºC. A enzima bruta foi purificada através de cromatografia em coluna de DEAE-celulose e de CM-celulose. A caracterização da enzima mostrou que a temperatura ótima da dextranase é de 50ºC, e o ph ótimo de 4,2. A enzima se mantém estável a 40ºC durante 7 horas. O pH de estabilidade se encontra na faixa de pH 4,2 a 5,0. A dextranase de Penicillium sp é fortemente inibida por íons Ag+, Mn2+, F2+ e Hg2+. Na hidrólise da dextrana a enzima .libera, isomaltose e isomaltotriose como produtos principais. Na aplicação da dextranase de Penicillium sp na hidrólise da dextrana em caldo de cana e em açúcar cristal, a mesma apresentou resultados satisfatóriosAbstract: Eight hundred and sixty three strains of fungi were isolated from cane Sugar fields and deteriorated cane Sugar and examined for production of dextranase. It was found a strain of Penieillium sp which has produced highest activity of dextranase when the strain was cultivated in liquid medium which contained dextran as toe sole carbon source. The optimal condition for dextranase production by the fungus was studied and found that dextranase was produced in submerged culture in medium containing dextran, 5g; defatted soy flour, 10g; yeast extract. 5g; KH2P04, 5g and MgS04.7H20, 2,5g in 1 liter, pH 6,0 at 30ºC. The crude enzyme was purified by DEAE-cellulose and CH cellulose column chromatograpoy. The enzyme was most active at pH 4,2, and the temperature optimum was near 50ºC. The dextianase was stable over a pH range from 4,2 - 5,0 at 40ºC for 7 hours. The enzyme was strongly inhibited by Ag+, Mn2+, Fe2+ and Hg2+ ions. The main hydrolysis products of dextran were glucose, isomaltose and isomaltotriose. The application of Penieillium sp dextranase in removing dextran from Raw cane Sugar juice and Raw Sugar showed satisfactory resultsMestradoMestre em Ciência de Alimento
