scholarly journals Experimental and Model Study on Raw Biomass Gasification Syngas Conditioning in a Molten NaOH-Na2CO3 Mixture

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3668
Author(s):  
Xiaobo Wang ◽  
Anqi Liu ◽  
Zengli Zhao ◽  
Haibin Li
Keyword(s):  
Molten Salt ◽  
Molten Salts ◽  
Bubble Diameter ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Gas Velocity ◽  
Reaction Conditions ◽  
Synthetic Process ◽  
Model Study

Raw syngas conditioning using molten salts was carried out in a fixed-bed reactor. The effects of the reaction conditions, including temperature, gas velocity, bubble diameter, molten salt static liquid heights, and inlet gas composition, on the composition of the syngas product and the properties of the spent molten salts were investigated. The molten salt absorbed CO2 in all of the experiments (at temperatures from 350 °C to 500 °C) and decreased its concentration down to 1%. The H2/CO increased from 0.94 to a maximum of 11.0, which may meet most of the synthetic process’ requirements. The temperature, gas velocity, and molten salt static liquid heights had significant effects on the H2 and CO concentrations in the gas product. Molten salt raw syngas conditioning can be a suitable follow-up procedure for gasification and pyrolysis.

Continuous synthesis of methanol: heterogeneous hydrogenation of ethylene carbonate over Cu/HMS catalysts in a fixed bed reactor system

2015 ◽  
Vol 51 (72) ◽  
pp. 13776-13778 ◽  
Author(s):  
Xi Chen ◽  
Yuanyuan Cui ◽  
Chao Wen ◽  
Bin Wang ◽  
Wei-Lin Dai
Keyword(s):  
Ethylene Glycol ◽  
Catalytic Hydrogenation ◽  
Ethylene Carbonate ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Synthetic Process ◽  
System P ◽  
Synthesis Of Methanol ◽  
Heterogeneous Hydrogenation ◽  
Hydrogenation Of Ethylene

Continuous fixed-bed catalytic hydrogenation of ethylene carbonate (EC) to methanol and ethylene glycol (EG), an emerging synthetic process of methanol via indirect conversion of CO2, was successfully performed over Cu/HMS catalysts prepared by the ammonia evaporation (AE) method.

scholarly journals High‐Pressure High‐Temperature Transparent Fixed‐Bed Reactor for Operando Gas‐Liquid Reaction Follow‐up

2019 ◽  
Vol 42 (3) ◽  
pp. 655-660 ◽  
Author(s):  
Marisa De Sousa Duarte ◽  
Matthieu Rolland ◽  
Corinne Sagnard ◽  
Didier Suire ◽  
Frederic Flacher ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Liquid Reaction ◽  
High Pressure High Temperature

Effect of Different Reaction Conditions on the Deactivation of Alumina-Supported Cobalt Fischer–Tropsch Catalysts in a Milli-Fixed-Bed Reactor: Experiments and Modeling

2014 ◽  
Vol 53 (17) ◽  
pp. 6913-6922 ◽  
Author(s):  
Majid Sadeqzadeh ◽  
Stéphane Chambrey ◽  
Jingping Hong ◽  
Pascal Fongarland ◽  
Francis Luck ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Fischer Tropsch ◽  
Reaction Conditions

Oxidative dehydrogenation of ethane to ethylene over phase-pure M1 MoVNbTeOx catalysts in a micro-channel reactor

2015 ◽  
Vol 5 (5) ◽  
pp. 2807-2813 ◽  
Author(s):  
Bozhao Chu ◽  
Lara Truter ◽  
Tjeerd Alexander Nijhuis ◽  
Yi Cheng
Keyword(s):  
Heat Transfer ◽  
Oxidative Dehydrogenation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Micro Channel ◽  
Channel Reactor ◽  
Reaction Conditions ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Phase Pure

Due to its excellent heat transfer ability, the micro-channel reactor with coated phase-pure M1 catalysts can achieve reactor productivity nearly 5 times higher than that of a traditional fixed-bed reactor under the same reaction conditions in oxidative dehydrogenation of ethane (ODHE).

FCC Gasoline Upgrading over Modified Nanoscale HZSM-5 Catalyst

2015 ◽  
Vol 1119 ◽  
pp. 58-65
Author(s):  
Xiao Bo Zhao
Keyword(s):  
Octane Number ◽  
Fixed Bed ◽  
Acid Strength ◽  
Zeolite Catalysts ◽  
Fixed Bed Reactor ◽  
Metal Species ◽  
Sulfur Concentration ◽  
Reaction Conditions ◽  
Fcc Gasoline ◽  
The Given

Nanoscale HZSM-5 zeolite was hydrothermally treated with ammonia water at 773K and then loaded with La2O3, NiO and MoO3. The parent and modified nanoscale HZSM-5 zeolite catalysts were characterized by XRD, NH3-TPD, Py-FTIR and N2 adsorption. The characterization results indicated that the acid strength of the parent nanoscale HZSM-5 was weakened, the L/B acidity increased notably and the metal species were well dispersed on the surface of the supports after the combined-modification measurement. In the presence of hydrogen, the performance of the modified HZSM-5 catalyst for FCC gasoline upgrading was evaluated in a fixed bed reactor. Under the given reaction conditions, the average olefin content in FCC gasoline was decreased from 33.2 vol% to 11.3 vol% within 300 h time on stream; the aromatic and isoparaffin contents in the product were increased from 29.8 vol% and 25.9 vol% to 39.0 vol% and 35.4 vol%, respectively. The modified nanoscale HZSM-5 catalyst reduced sulfur concentration in FCC gasoline by about 90% without gasoline octane number loss.

Fischer Tropsch Synthesis: The Promoter Effects, Operating Conditions, and Reactor Synthesis

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Majid Sarkari ◽  
Farhad Fazlollahi ◽  
Hossein Atashi
Keyword(s):  
Fixed Bed ◽  
Operating Conditions ◽  
Tropsch Synthesis ◽  
Fixed Bed Reactor ◽  
Fischer Tropsch ◽  
Reaction Conditions ◽  
Fischer Tropsch Synthesis ◽  
Hydrocarbon Chains ◽  
Promoter Effects ◽  
Olefin Selectivity

The effects of K, Ce, Zn, Cs, and Rb promoters on the structure and catalytic behavior of precipitated 50%Fe/50%Mn catalyst in Fischer–Tropsch synthesis (FTS) were investigated in a fixed-bed reactor. The effects of promoter on Fischer-Tropsch iron catalysts caused an increased growth probability of hydrocarbon chains from 0.67 to 0.75 for K to Rb promoter, and the olefin/paraffin ratios increased from 0.99 to 1.36 for Rb to K-promoted catalyst. The effect on the olefin selectivity was certainly due to increased adsorption strength of CO causing an enhanced displacement of olefin. The catalysts were assessed in terms of their FTS activity and product selectivity using Anderson–Schulz–Flory (ASF) models. The effects of various reaction conditions such as flow rates, temperatures, and H2/CO feed ratios were studied and process synthesis concepts were used to investigate interactions between the optimum regions for reactor operation and the experimental results.

Parametric Study of Thermal Flow-Reversal Reactor for Ventilation Air Methane Oxidation

2013 ◽  
Vol 372 ◽  
pp. 406-409
Author(s):  
Hao Xin Deng ◽  
Yu Xin Wen ◽  
Qi Xiao ◽  
Yun Han Xiao
Keyword(s):  
Methane Oxidation ◽  
Residence Time ◽  
Methane Conversion ◽  
Methane Concentration ◽  
Fixed Bed ◽  
Experimental Studies ◽  
Flow Reversal ◽  
Fixed Bed Reactor ◽  
Thermal Flow ◽  
Gas Velocity

Experimental studies of ventilation air methane oxidation were carried out in a thermal flow-reversal reactor and a fixed bed reactor in laboratory scale respectively. The reaction characteristics of ventilation air methane in a fixed bed reactor were investigated. The influence of the feed gas velocity and the lean methane concentration on the temperature profile in the thermal flow-reversal reactor was studied. The internal temperature uniformity of the cross section and the cavity of the flow-reversal reactor which have influence on lean methane conversion have also been discussed and analyzed. The results shows that the oxidation of lean methane needs to meet the ignition temperature condition and the residence time condition, and the temperature distribution in the thermal flow-reversal reactor is mainly related to the methane concentration and the feed gas velocity while the methane conversion rate is mainly related to the temperature and the residence time in the high temperature zone of the reactor.

Sign in / Sign up

Export Citation Format

Share Document