Temesgen atnafu (27 risultati)

Condizione: New.

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Bachelor Thesis from the year 2008 in the subject Engineering - Chemical Engineering, grade: A, Bahir Dar University (Engineering Faculity), course: Chemical Engineering, language: English, abstract: AbstractMain problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study different types of desiccants are used. Instead of silica gel, activated alumina, zeolite, molecular sieves, activated carbon were used. Membrane dryer are used to solve our regeneration problem. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment. The construction and operation cost of membrane dryer is too simple and can also be used in hazardous condition.Keywords: Adsorption time, Regeneration time, Activated carbon, Membrane dryer.…

Condizione: New.

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Master's Thesis from the year 2012 in the subject Engineering - Chemical Engineering, Addis Ababa University, language: English, abstract: Lignocellulosic materials (eg.Prosopis juliflora) can be utilized to produce ethanol, a promising alternative energy source for the limited crude oil. This study involved optimisation of acid hydrolysis in ethanol production from prosopis juliflora. The conversion of prosopis juliflora to ethanol can be achieved mainly by three process steps: pretreatment of prosopis juliflora wood to remove lignin and hemicellulose, acid hydrolysis of pretreated prosopis juliflora to convert cellulose into reducing sugar(glucose) and fermentation of the sugars to ethanol using Saccharomyces cerevisiae in anaerobic condition. A two level full factorial design with four factors, two levels and two replicas (24\*2=32 experimental runs) was applied to optimize acid hydrolysis and study the interaction effects of acid hydrolysis factors, namely, acid concentration, solid fraction, temperature, and time. An optimization was carried out to optimize acid hydrolysis process variables so as to determine the best acid concentration, solid fraction, temperature, and contact time that resulted maximum ethanol yield. The screening of significant acid hydrolysis factors were done by using the two-level full factorial design using design expert® 7 software. The statistical analysis showed that the ethanol yield of (40.91% (g/g)) was obtained at optimised acid hydrolysis variables of 0.5%v/v acid concentration, 5%w/w solid fraction,105.01°C temperature, and 10 minutes hydrolysis time.Keywords: Prosopis juliflora, pretreatment, hydrolysis, fermentation, 2 level factorial, optimization.…

Condizione: Hervorragend. Zustand: Hervorragend | Sprache: Englisch | Produktart: Bücher | Bachelor Thesis from the year 2008 in the subject Engineering - Chemical Engineering, grade: A, Bahir Dar University (Engineering Faculity), course: Chemical Engineering, language: English, abstract: AbstractMain problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study different types of desiccants are used. Instead of silica gel, activated alumina, zeolite, molecular sieves, activated carbon were used. Membrane dryer are used to solve our regeneration problem. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment. The construction and operation cost of membrane dryer is too simple and can also be used in hazardous condition.Keywords: Adsorption time, Regeneration time, Activated carbon, Membrane dryer. …

Taschenbuch. Condizione: Neu. Membrane Systems for Adsorption & Regeneration Problems in Air Dryer | Temesgen Atnafu | Taschenbuch | 64 S. | Englisch | 2013 | LAP LAMBERT Academic Publishing | EAN 9783659334214 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.…

Taschenbuch. Condizione: Neu. Optimization in Ethanol Production from Prosopis Juliflora | Temesgen Atnafu | Taschenbuch | 108 S. | Englisch | 2012 | LAP LAMBERT Academic Publishing | EAN 9783659201967 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.…

Taschenbuch. Condizione: Neu. Calcium Chloride Recovery in Soda Ash Production by Solvay's Process | Temesgen Atnafu (u. a.) | Taschenbuch | 84 S. | Englisch | 2013 | LAP LAMBERT Academic Publishing | EAN 9783659326417 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. …

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Bachelor Thesis from the year 2008 in the subject Engineering - Chemical Engineering, grade: A, Bahir Dar University (Engineering Faculity), course: Chemical Engineering, language: English, abstract: AbstractMain problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study different types of desiccants are used. Instead of silica gel, activated alumina, zeolite, molecular sieves, activated carbon were used. Membrane dryer are used to solve our regeneration problem. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment. The construction and operation cost of membrane dryer is too simple and can also be used in hazardous condition.Keywords: Adsorption time, Regeneration time, Activated carbon, Membrane dryer 64 pp. Englisch. …

Condizione: New. Print on Demand pp. 64.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Master's Thesis from the year 2012 in the subject Engineering - Chemical Engineering, Addis Ababa University, language: English, abstract: Lignocellulosic materials (eg.Prosopis juliflora) can be utilized to produce ethanol, a promising alternative energy source for the limited crude oil. This study involved optimisation of acid hydrolysis in ethanol production from prosopis juliflora. The conversion of prosopis juliflora to ethanol can be achieved mainly by three process steps: pretreatment of prosopis juliflora wood to remove lignin and hemicellulose, acid hydrolysis of pretreated prosopis juliflora to convert cellulose into reducing sugar(glucose) and fermentation of the sugars to ethanol using Saccharomyces cerevisiae in anaerobic condition. A two level full factorial design with four factors, two levels and two replicas (24\*2=32 experimental runs) was applied to optimize acid hydrolysis and study the interaction effects of acid hydrolysis factors, namely, acid concentration, solid fraction, temperature, and time. An optimization was carried out to optimize acid hydrolysis process variables so as to determine the best acid concentration, solid fraction, temperature, and contact time that resulted maximum ethanol yield. The screening of significant acid hydrolysis factors were done by using the two-level full factorial design using design expert® 7 software. The statistical analysis showed that the ethanol yield of (40.91% (g/g)) was obtained at optimised acid hydrolysis variables of 0.5%v/v acid concentration, 5%w/w solid fraction,105.01°C temperature, and 10 minutes hydrolysis time.Keywords: Prosopis juliflora, pretreatment, hydrolysis, fermentation, 2 level factorial, optimization. 108 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Soda ash production companies have a lot of wastage of calcium chloride going on daily and lot of valuable resources are being wasted. If this continues and any solution is not provided then this problem can prove to be very vital for the industry.In this study we look forward to design a major project based on recovery of calcium chloride, which will be fruitful to the industry to solve this setback and hence will be profit making concept. 84 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This study involved optimisation of acid hydrolysis in ethanol production from prosopis juliflora. A two level full factorial design with four factors, two levels and two replicas (24 2=32 experimental runs) was applied to optimize acid hydrolysis and study the interaction effects of acid hydrolysis factors, namely, acid concentration, solid fraction, temperature, and time. The screening of significant acid hydrolysis factors were done by using the two-level full factorial design using design expert® 7 software. 108 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The Main problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study membrane systems are used to solve adsorption and regeneration problems in air drying unit. Instead of silica gel, different types of desiccants: activated alumina, zeolite, molecular sieves, activated carbon were used. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment. 64 pp. Englisch.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - This study involved optimisation of acid hydrolysis in ethanol production from prosopis juliflora. A two level full factorial design with four factors, two levels and two replicas (24 2=32 experimental runs) was applied to optimize acid hydrolysis and study the interaction effects of acid hydrolysis factors, namely, acid concentration, solid fraction, temperature, and time. The screening of significant acid hydrolysis factors were done by using the two-level full factorial design using design expert® 7 software.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - This book is based on the original research in one of Ethiopian Leather Industry in 2012. As it is known waste is the most horrible thing to our environment especially a waste from tannery industries, which have been affecting the people and brings drastic to the environment. In this research book an aerobic pond was designed by taking appropriate assumptions and we hope this book is used as a guide for chemical engineering and environmental engineering undergraduate students. In addition to that for engineers who work in industries like leather engineers, it has immense use. We can make our environment suitable by treating industrial wastes and therefore we may create our globe again by decrease the degree of toxicity and hazard of industries.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - The Main problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study membrane systems are used to solve adsorption and regeneration problems in air drying unit. Instead of silica gel, different types of desiccants: activated alumina, zeolite, molecular sieves, activated carbon were used. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment. …

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Yimer SeidMy name is Seid Yimer, I was born in Tita, Ethiopia in 1986. I got Master of Technology Degree from Addis Ababa University and IIT-Delhi joint master program in Chemical Engineering in 2010 and B.Sc in Chemical Engineering .…

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Atnafu TemesgenI am a Lecturer in Wollo University (one of Ethiopian public University).I got Master of Science in chemical engineering from Addis Ababa University and Indian Institute of Technology-Delhi Joint post graduate program .…

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Atnafu TemesgenI am a lecturer in Wollo University Institute of Technology Chemical Engineering department.I got master of Science in Chemical Engineering from Addis Ababa University -Ethiopia and IIT-Delhi postgraduate program in 20.…

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Atnafu TemesgenI am a lecturer in Wollo University-Ethiopa. I got master of science in chemical engineering from Addis Ababa University -Ethiopia & Indian Institute of technology Delhi (IIT-Delhi) joint post graduate program in 2010.…

Taschenbuch. Condizione: Neu. Membrane Systems for Adsorption and Regeneration Cycle Problems in Air Drying Unit | Membrane Systems for Air Drying Unit | Temesgen Atnafu | Taschenbuch | 64 S. | Englisch | 2013 | GRIN Verlag | EAN 9783656363446 | Verantwortliche Person für die EU: GRIN Publishing GmbH, Waltherstr. 23, 80337 München, info[at]grin[dot]com | Anbieter: preigu Print on Demand.…

Taschenbuch. Condizione: Neu. Optimization of Acid Hydrolysis in Ethanol Production from Prosopis juliflora | Temesgen Atnafu | Taschenbuch | 108 S. | Englisch | 2013 | GRIN Verlag | EAN 9783656331490 | Verantwortliche Person für die EU: GRIN Publishing GmbH, Waltherstr. 23, 80337 München, info[at]grin[dot]com | Anbieter: preigu Print on Demand. …

Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The Main problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study membrane systems are used to solve adsorption and regeneration problems in air drying unit. Instead of silica gel, different types of desiccants: activated alumina, zeolite, molecular sieves, activated carbon were used. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 64 pp. Englisch. …

Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Soda ash production companies have a lot of wastage of calcium chloride going on daily and lot of valuable resources are being wasted. If this continues and any solution is not provided then this problem can prove to be very vital for the industry.In this study we look forward to design a major project based on recovery of calcium chloride, which will be fruitful to the industry to solve this setback and hence will be profit making concept.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 84 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -This study involved optimisation of acid hydrolysis in ethanol production from prosopis juliflora. A two level full factorial design with four factors, two levels and two replicas (24\*2=32 experimental runs) was applied to optimize acid hydrolysis and study the interaction effects of acid hydrolysis factors, namely, acid concentration, solid fraction, temperature, and time. The screening of significant acid hydrolysis factors were done by using the two-level full factorial design using design expert® 7 software.OmniScriptum SRL, Str. Armeneasca 28/1, office 1, 2012 Chisinau 108 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -This book is based on the original research in one of Ethiopian Leather Industry in 2012. As it is known waste is the most horrible thing to our environment especially a waste from tannery industries, which have been affecting the people and brings drastic to the environment. In this research book an aerobic pond was designed by taking appropriate assumptions and we hope this book is used as a guide for chemical engineering and environmental engineering undergraduate students. In addition to that for engineers who work in industries like leather engineers, it has immense use. We can make our environment suitable by treating industrial wastes and therefore we may create our globe again by decrease the degree of toxicity and hazard of industries.OmniScriptum SRL, Str. Armeneasca 28/1, office 1, 2012 Chisinau 64 pp. Englisch. …