Kinetics of coal and catalytic coal pyrolysis reactions in a fixed bed reactor

Fuel ◽  
1993 ◽  
Vol 72 (5) ◽  
pp. 709
Author(s):  
P.K. Dey
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Kinetics Of

scholarly journals Hydrogen Storage in Propane-Hydrate: Theoretical and Experimental Study

2020 ◽  
Vol 10 (24) ◽  
pp. 8962
Author(s):  
Mohammad Reza Ghaani ◽  
Satoshi Takeya ◽  
Niall J. English
Keyword(s):  
Hydrogen Storage ◽  
Storage Capacity ◽  
Fixed Bed ◽  
Hydrogen Uptake ◽  
Hydrogen Release ◽  
Fixed Bed Reactor ◽  
Gas Dispersion ◽  
Fixed Bed Reactors ◽  
Non Equilibrium Molecular Dynamics ◽  
Kinetics Of

There have been studies on gas-phase promoter facilitation of H2-containing clathrates. In the present study, non-equilibrium molecular dynamics (NEMD) simulations were conducted to analyse hydrogen release and uptake from/into propane planar clathrate surfaces at 180–273 K. The kinetics of the formation of propane hydrate as the host for hydrogen as well as hydrogen uptake into this framework was investigated experimentally using a fixed-bed reactor. The experimental hydrogen storage capacity propane hydrate was found to be around 1.04 wt% in compare with the theoretical expected 1.13 wt% storage capacity of propane hydrate. As a result, we advocate some limitation of gas-dispersion (fixed-bed) reactors such as the possibility of having un-reacted water as well as limited diffusion of hydrogen in the bulk hydrate.

Pyrolysis Characteristics and Kinetics of Cassava Residues

2014 ◽  
Vol 953-954 ◽  
pp. 325-329
Author(s):  
Jin Wei Jia ◽  
Di Yang ◽  
He Long Hui ◽  
Xing Min Fu ◽  
Lu Liu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Kinetic Parameters ◽  
Fixed Bed ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Biomass Feedstock ◽  
Pyrolysis Characteristics ◽  
Three Samples ◽  
Bio Oil ◽  
Kinetics Of

The aims of this work were to investigate the influence of feedstock properties of different part of cassava residues (cassava rhizome (CR), cassava stalk (CS) and cassava leaf (CL)) and operating temperatures on the pyrolysis characteristics and the kinetic parameters. Pyrolysis experiments of three selected biomass feedstock were conducted using a fixed-bed reactor. It was shown that the bio-oil yield of cassava stalk reached the maxima at 600°C, and the char yield reduced with the temperature, whereas the gas yield increased with temperature. The cassava rhizome presented higher thermochemical reactivity than the other samples. The activation energy of cassava stalks was 37.57 kJ / mol and that of cassava rhizome (39.42 kJ / mol) increased slightly. The activation energy of cassava leaf (22.85 kJ / mol) was lowest of the three samples.

Hydrate-Based Carbon Capture Process: Assessment of Various Packed Bed Systems for Boosted Kinetics of Hydrate Formation

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Amit Arora ◽  
Asheesh Kumar ◽  
Gaurav Bhattacharjee ◽  
Chandrajit Balomajumder ◽  
Pushpendra Kumar
Keyword(s):  
Carbon Dioxide ◽  
Carbon Capture ◽  
Carbon Dioxide Capture ◽  
Fixed Bed ◽  
Hydrate Formation ◽  
Packed Bed ◽  
Fixed Bed Reactor ◽  
Capture Process ◽  
Novel Technologies ◽  
Kinetics Of

Abstract The case for developing novel technologies for carbon dioxide (CO2) capture is fast gaining traction owing to increasing levels of anthropogenic CO2 being emitted into the atmosphere. Here, we have studied the hydrate-based carbon dioxide capture and separation process from a fundamental viewpoint by exploring the use of various packed bed media to enhance the kinetics of hydrate formation using pure CO2 as the hydrate former. We established the fixed bed reactor (FBR) configuration as a superior option over the commonly used stirred tank reactor (STR) setups typically used for hydrate formation studies by showing enhanced hydrate formation kinetics using the former. For the various packing material studied, we have observed silica gel with 100 nm pore size to return the best kinetic performance, corresponding to a water to hydrate conversion of 28 mol% for 3 h of hydrate growth. The fundamental results obtained in the present study set up a solid foundation for follow-up works with a more applied perspective and should be of interest to researchers working in the carbon dioxide capture and storage and gas hydrate fields alike.

Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor

2017 ◽  
Vol 25 (4) ◽  
pp. 507-515 ◽  
Author(s):  
Shuai Cheng ◽  
Dengguo Lai ◽  
Zhen Shi ◽  
Leisheng Hong ◽  
Jianling Zhang ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Secondary Reactions

The Effects of Methanol on Honehe Lignite Pyrolysis

2013 ◽  
Vol 291-294 ◽  
pp. 748-754
Author(s):  
De Min He ◽  
Jun Guan ◽  
Lin Zhang ◽  
Qiu Min Zhang
Keyword(s):  
Flow Rate ◽  
Functional Group ◽  
Coal Tar ◽  
Fixed Bed ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Oxygen Functional Group ◽  
N2 Atmosphere ◽  
N2 Flow Rate

In this paper, the pyrolysis of Honehe Lignite in N2 and N2-Methanol atmospheres were investigated on a fixed-bed reactor. The methanol flow rate, pressure, temperature and holding time were studied. The maximum of coal tar yields 12.01% (with methanol injected in) and 9.61% (absence of methanol) were achieved on the conditions of 520°C, 0.5MPa, N2 flow rate 50ml/min, methanol flow rate 0.1ml/min and holding time 20min, and the relative growing rate was about 25.0%. The gas from coal pyrolysis was detected by GC, and the coal tar was reprocessed and then detected by GC-MS. While the solid char was detected by IR to study the change of oxygen functional group during coal pyrolysis in N2-Methanol atmosphere. Compared with that pyrolysis in N2 atmosphere, the components, characteristics and properties of coal tar, gas and solid char varied a lot. The results showed that the injection of methanol into the system changed the products yields and distribution. The results showed that the total yields of phenol, cresol and xylenol (short for PCX) in the Acidic were about 1.93% and 1.15% (daf) in two atmospheres respectively, the PCX yields with methanol injected was about 1.67 times higher than that absence of methanol.

Kinetics of Camphene Esterification to Isobornyl Acetate

2011 ◽  
Vol 233-235 ◽  
pp. 990-998 ◽  
Author(s):  
Dian Hua Liu ◽  
Ding Ye Fang ◽  
Qin Qin Guan ◽  
A Jian Tao
Keyword(s):  
Acetic Acid ◽  
Kinetic Model ◽  
Continuous Process ◽  
Fixed Bed ◽  
Space Velocity ◽  
Batch Process ◽  
Fixed Bed Reactor ◽  
Feed Ratio ◽  
Continuous Reaction ◽  
Kinetics Of

The conventional process for isobornyl acetate synthesis from camphene and acetic acid is a batch process. The purpose of this paper is to synthesize isobornyl acetate in continuous process in a fixed bed reactor. The continuous reaction conditions were studied. The experiment was put into practice under the following conditions: 35-45, camphene/acetic acid feed ratio(wt%) from 1 to 2 and space velocity from 0.6 to 1.8 h-1. A kinetic model was developed which describes the experimental data well. A pilot fixed reactor was simulated by using the kinetic model.

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