Gas/liquid mass transfer processes in a carbon dioxide/alkane system

2005 ◽  
Vol 80 (7) ◽  
pp. 812-818 ◽  
Author(s):  
D Gómez-Díaz ◽  
JM Navaza
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Transfer Processes ◽  
Liquid Mass ◽  
Mass Transfer Processes ◽  
Liquid Mass Transfer

Using in-line static mixers to intensify gas–liquid mass transfer processes

2005 ◽  
Vol 60 (22) ◽  
pp. 6378-6390 ◽  
Author(s):  
A.M. Al Taweel ◽  
J. Yan ◽  
F. Azizi ◽  
D. Odedra ◽  
H.G. Gomaa
Keyword(s):  
Mass Transfer ◽  
Static Mixers ◽  
Transfer Processes ◽  
Liquid Mass ◽  
Mass Transfer Processes ◽  
Liquid Mass Transfer

scholarly journals Biotransformation of Methane and Carbon Dioxide Into High-Value Products by Methanotrophs: Current State of Art and Future Prospects

2021 ◽  
Vol 12 ◽  
Author(s):  
Krishna Kalyani Sahoo ◽  
Gargi Goswami ◽  
Debasish Das
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Carbon Dioxide Sequestration ◽  
Value Added ◽  
Operating Conditions ◽  
Scale Production ◽  
Liquid Mass ◽  
Liquid Mass Transfer ◽  
Solubility Of Gases ◽  
Low Solubility

Conventional chemical methods to transform methane and carbon dioxide into useful chemicals are plagued by the requirement for extreme operating conditions and expensive catalysts. Exploitation of microorganisms as biocatalysts is an attractive alternative to sequester these C1 compounds and convert them into value-added chemicals through their inherent metabolic pathways. Microbial biocatalysts are advantageous over chemical processes as they require mild-operating conditions and do not release any toxic by-products. Methanotrophs are potential cell-factories for synthesizing a wide range of high-value products via utilizing methane as the sole source of carbon and energy, and hence, serve as excellent candidate for methane sequestration. Besides, methanotrophs are capable of capturing carbon dioxide and enzymatically hydrogenating it into methanol, and hence qualify to be suitable candidates for carbon dioxide sequestration. However, large-scale production of value-added products from methanotrophs still presents an overwhelming challenge, due to gas-liquid mass transfer limitations, low solubility of gases in liquid medium and low titer of products. This requires design and engineering of efficient reactors for scale-up of the process. The present review offers an overview of the metabolic architecture of methanotrophs and the range of product portfolio they can offer. Special emphasis is given on methanol biosynthesis as a potential biofuel molecule, through utilization of methane and alternate pathway of carbon dioxide sequestration. In view of the gas-liquid mass transfer and low solubility of gases, the key rate-limiting step in gas fermentation, emphasis is given toward reactor design consideration essential to achieve better process performance.

Gas/liquid mass transfer in carbon dioxide–alkanes mixtures

2005 ◽  
Vol 114 (1-3) ◽  
pp. 131-137 ◽  
Author(s):  
D. Gómez-Díaz ◽  
J.M. Navaza
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Liquid Mass ◽  
Liquid Mass Transfer

scholarly journals Enhanced bioconversion of hydrogen and carbon dioxide to methane using a micro-nano sparger system: mass balance and energy consumption

RSC Advances ◽  
2018 ◽  
Vol 8 (47) ◽  
pp. 26488-26496 ◽  
Author(s):  
Ye Liu ◽  
Ying Wang ◽  
Xinlei Wen ◽  
Kazuya Shimizu ◽  
Zhongfang Lei ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Energy Consumption ◽  
Mass Balance ◽  
Biofuel Production ◽  
Commercial Application ◽  
Liquid Mass ◽  
Liquid Mass Transfer

Simultaneous CO2removal with renewable biofuel production can be achieved by methanogens through conversion of CO2and H2into CH4. However, the low gas–liquid mass transfer (kLa) of H2limits the commercial application of this bioconversion.

Mathematical Modeling of Heat and Mass Transfer Processes During Pyrolysis and Combustion of a Single Biomass Particle

2012 ◽  
Author(s):  
Y. Haseli ◽  
J. A. van Oijen ◽  
L. P. H. de Goey
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Carbon Monoxide ◽  
Water Vapor ◽  
Gas Phase ◽  
Combustion Process ◽  
Combustion Model ◽  
Gas Phase Reactions ◽  
Transfer Processes ◽  
Mass Transfer Processes

A detailed mathematical model is developed for simulation of heat and mass transfer processes during the pyrolysis and combustion of a single biomass particle. The kinetic scheme of Shafizadeh and Chin is employed to describe the pyrolysis process. The light gases formed during the biomass pyrolysis is assumed to consist of methane, carbon dioxide, carbon monoxide, hydrogen and water vapor with given mass fractions relevant to those found in the experiments of high heating conditions. The combustion model takes into account the reactions of oxygen with methane, hydrogen, carbon monoxide, tar and char as well as gasification of char with water vapor and carbon dioxide. Appropriate correlations taken from past studies are used for computation of the rate of these reactions. The model allows calculation of time and space evolution of various parameters including biomass and char densities, gaseous species and temperature. Different experimental data reported in the literature are employed to validate the pyrolysis and combustion models. The reasonable agreement obtained between the predictions and measured data reveals that the presented model is capable of successfully capturing various experiments of wood particle undergoing a pyrolysis or combustion process. In particular, the role of gas phase reactions within and adjacent to particle on the combustion process is examined. The results indicate that for the case of small particles in the order of millimeter size and less, one may neglect any effects of gas phase reactions. However, for larger particles, a combustion model may need to include hydrogen oxidation and even carbon monoxide combustion reactions.

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