Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
A kinetic model that describes the methanol production rate over a CuO/ZnO/AI203 catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H2/(CO+CO2) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO2 ratio is held constant at 9. At each H2/(CO+CO2) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr kg{sub cat}. The effect of H2/(CO+CO2) ratio and space velocity on methanol production rate, conversions, and product composition is further investigated. The results indicate that the highest methanol production rate can be achieved at H2/(CO+CO2) ratio of 1 followed by H2/(CO+CO2) ratio of 0.5 and 2 respectively. The hydrogen and carbon monoxide conversions decrease with increasing space velocity for all H2/(CO+CO2) ratios tested. Carbon monoxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 0.5 and 2. On the other hand, carbon dioxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 1. At all H2/(CO+CO2) ratios, the extent of the reverse water gas shift reaction decreases with increasing space velocity. The effect of temperature on the kinetics is examined by using the same experimental approach at 508 K. It is found that a different reaction sequence takes place at each temperature. Also, a time on stream study is conducted simultaneously in order to investigate the characteristic of catalyst deactivation with time on stream. During the first 150 hours of time on stream, the catalyst loses approximately 2/3 of its initial activity before reaching a steady state activity.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
A kinetic model that describes the methanol production rate over a CuO/ZnO/AI203 catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H2/(CO+CO2) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO2 ratio is held constant at 9. At each H2/(CO+CO2) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr kg{sub cat}. The effect of H2/(CO+CO2) ratio and space velocity on methanol production rate, conversions, and product composition is further investigated. The results indicate that the highest methanol production rate can be achieved at H2/(CO+CO2) ratio of 1 followed by H2/(CO+CO2) ratio of 0.5 and 2 respectively. The hydrogen and carbon monoxide conversions decrease with increasing space velocity for all H2/(CO+CO2) ratios tested. Carbon monoxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 0.5 and 2. On the other hand, carbon dioxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 1. At all H2/(CO+CO2) ratios, the extent of the reverse water gas shift reaction decreases with increasing space velocity. The effect of temperature on the kinetics is examined by using the same experimental approach at 508 K. It is found that a different reaction sequence takes place at each temperature. Also, a time on stream study is conducted simultaneously in order to investigate the characteristic of catalyst deactivation with time on stream. During the first 150 hours of time on stream, the catalyst loses approximately 2/3 of its initial activity before reaching a steady state activity.
Author: Hamad Abdulwahab Al-Adwani
Publisher:
ISBN:
Category : Methanol
Languages : en
Pages : 214
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Book Description
Author: Jerzy Skrzypek
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 174
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Book Description
Author: Sunggyu Lee
Publisher: CRC Press
ISBN: 9780849346101
Category : Science
Languages : en
Pages : 254
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Book Description
This easy-to-read work is a comprehensive review which focuses primarily on catalytic methanol synthesis. It includes a historic summary of the development of methanol synthesis technology, as well as extensive discussions on statistical experimental design, fabrication and operation of laboratory scale systems. This unique volume also discusses various new catalysts and processes, with special attention to the thermodynamics of methanol synthesis-especially in relation to the new liquid phase process. The comprehensive and practical approach to chemical and synfuel process development makes it an excellent reference in methanol synthesis, reactor design, and scale-up. Written as a practical guide to researchers who are involved in hands-on process research, this book is also a valuable asset to practicing chemical engineers and graduate students interested in reaction engineering, thermodynamics, catalyst development and process design.
Author: Lujie Ye
Publisher:
ISBN:
Category : Carbonates
Languages : en
Pages :
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Book Description
A carbonate modified catalyst CuO/ZnCO3/Al2O3 for catalytic synthesis of methanol from syngas was successfully devised and developed applying a novel condensed-phase reactive modification technology to a commercial CuO/ZnO/Al2O3 catalyst. This modified catalyst was also experimentally investigated in a fully continuous, proof-of-concept mini-pilot scale system for a process engineering study of syngas-to-methanol process in a mechanically agitated slurry reactor (MASR).
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 754
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Book Description
Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1461524539
Category : Science
Languages : en
Pages : 391
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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the though that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemi nation. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 37 (thesis year 1992) a total of 12,549 thesis titles from 25 Canadian and 153 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 37 reports theses submitted in 1992, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Author: Yi Cheng
Publisher: John Wiley & Sons
ISBN: 1119251087
Category : Technology & Engineering
Languages : en
Pages : 1041
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Book Description
Provides a comprehensive review on the brand-new development of several multiphase reactor techniques applied in energy-related processes Explains the fundamentals of multiphase reactors as well as the sophisticated applications Helps the reader to understand the key problems and solutions of clean coal conversion techniques Details the emerging processes for novel refining technology, clean coal conversion techniques, low-cost hydrogen productions and CO2 capture and storage Introduces current energy-related processes and links the basic principles of emerging processes to the features of multiphase reactors providing an overview of energy conversion in combination with multiphase reactor engineering Includes case studies of novel reactors to illustrate the special features of these reactors
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
Catalytic studies on a new method for methanol synthesis from CO and H2 in a slurry reactor are described. This reaction proceeds through the carbonylation of methanol to methyl formate in the liquid phase followed by hydrogenolysis of methyl formate to two molecules of methanol; the net result is the reaction of CO with H2 to give methanol. Moderate temperatures and pressures (100--160°C, 50--65 atm) are used. Reaction rates using mixed catalysts comprised of an alkali methoxide and Cu-chromite are presented. It seems likely that Cu-chromite maintains the activity of the alkali methoxide catalyst. A mixed catalyst comprised of potassium methoxide and Cu-chromite was found to be the most active under the reaction conditions used. Evidence is provided for an interaction between the alkali methoxide and Cu-chromite. 27 refs., 6 figs., 2 tabs.
