Optimal fixed-bed reactor operation via ordered particle-size profile

1985 ◽  
Vol 24 (4) ◽  
pp. 1302-1305
Author(s):  
G. Narsimhan ◽  
C. Lakshmanan
Keyword(s):  
Particle Size ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Reactor Operation ◽  
Size Profile

Mercury Sorption on Chitosan

2007 ◽  
Vol 20-21 ◽  
pp. 635-638 ◽  
Author(s):  
Karol Campos ◽  
Eric Guibal ◽  
Francisco Peirano ◽  
M. Ly ◽  
Holger Maldonado
Keyword(s):  
Particle Size ◽  
Metal Ion ◽  
Fixed Bed ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Fixed Bed Reactor ◽  
Continuous Systems ◽  
Maximum Sorption

Mercury sorption on chitosan was investigated in batch and continuous systems. Chitosan sorption properties were determined through sorption isotherms. Langmuir and Freundlich equations were used for the modeling of isotherms at pH 5. In batch systems, maximum sorption capacities reached 550 mg Hg/g. Sorption kinetics have been studied as a function of sorbent particle size and stirring rate. Dynamic removal of mercury was tested in a fixed bed reactor investigating the following parameters: particle size, column size, flow velocity and metal ion concentration. Clark and Adams-Bohart models were evaluated for the simulation of breakthrough curves. This study shows that chitosan is an effective sorbent for the treatment and recovery of mercury from dilute effluents at near neutral pH.

Influence of particle size on pyrolysis and gasification performance of municipal solid waste in a fixed bed reactor

2010 ◽  
Vol 101 (16) ◽  
pp. 6517-6520 ◽  
Author(s):  
Siyi Luo ◽  
Bo Xiao ◽  
Zhiquan Hu ◽  
Shiming Liu ◽  
Yanwen Guan ◽  
...  
Keyword(s):  
Particle Size ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Fixed Bed ◽  
Fixed Bed Reactor

The Fixed Bed Reaction of Residual Natural Rubber for Oil Production by Pyrolysis Process

2014 ◽  
Vol 931-932 ◽  
pp. 225-230
Author(s):  
Khanita Kamwilaisak ◽  
Mallika Thabuot
Keyword(s):  
Particle Size ◽  
Pyrolysis Temperature ◽  
Fixed Bed ◽  
Maximum Amount ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Pyrolysis Process ◽  
Pyrolysis Reaction ◽  
Benzenedicarboxylic Acid ◽  
Chemical Feedstock

The aim of this study is to use pyrolysis reaction to produce oil product as a fuel or chemical feedstock. The fixed bed reactor was used as a pyrolysis system. The pyrolysis reaction of residual para rubber was operated in the absence of catalyse. The operating conditions such as particle size (0.5 and 1.0 cm3) and pyrolysis temperature (500, 550 and 600 OC) were studied under N2 conditions and retention time 90 min. The result shows the para rubber size 1.0 cm3 can be produced liquid phase more than of para rubber size of 0.5 cm3. The optimised condition with the highest oil yield was at 550OC with rubber size of 1.0 cm3. The percentage of the product was 60% of liquid, 35% of gas and 5% of solid (char). Furthermore, the FTIR result can be presented the supported evidence that the transformation of aliphatic contents to be aromatic contents was increased with increased temperature. Also, GCMS analysis was used for the identification and quantification of the product. It was found 5 major products that can be used as a chemical feedstock. The maximum amount of component was 2-Benzenedicarboxylic acid, diisooctyl ester (Isooctyl phthalate) with 22.08%. This is a plasticizer with higher cost than fuel.

scholarly journals Optimization and Characterization of Bio-oil Produced from Rice Husk Using Surface Response Methodology

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ige Ayodeji Rapheal ◽  
Elinge Cosmos Moki ◽  
Aliyu Muhammad ◽  
Gwani Mohammed ◽  
Lawal Hassan Gusau
Keyword(s):  
Particle Size ◽  
Rice Husk ◽  
Fixed Bed ◽  
Production Optimization ◽  
Fixed Bed Reactor ◽  
Pyrolysis Process ◽  
Surface Response Methodology ◽  
Chemical Efficiency ◽  
Bio Oil

AbstractThe study depicts the production, optimization and characterization of bio-oil from pyrolyzed rice husk using a fabricated fixed bed reactor. The pyrolysis process was conducted with bio-oil response, bio-char response and non-condensable gases response as products. The effect of pyrolysis variables were observed by the production of the bio-oil as the response. Sixty runs of pyrolysis experiments were suggested by Box Benkhen design indicated optimum pyrolysis conditions at particle size of 2.03mm mesh, reaction time of 81.80 mins and temperature of 650oC for rice husk. The maximum bio-oil yield was obtained with 38.39% at optimum condition of the variables. The bio-oil sample obtained had better performance compared with ASTM standard. Such a determination would contribute so immensely to a significant comprehension of the chemical efficiency of the pyrolysis reaction.

Effect of particle size and temperature on gasification performance of coconut and palm kernel shells in downdraft fixed-bed reactor

Energy ◽  
2019 ◽  
Vol 175 ◽  
pp. 931-940 ◽  
Author(s):  
Ahmad Zubair Yahaya ◽  
Mahendra Rao Somalu ◽  
Andanastuti Muchtar ◽  
Shaharin Anwar Sulaiman ◽  
Wan Ramli Wan Daud
Keyword(s):  
Particle Size ◽  
Fixed Bed ◽  
Palm Kernel ◽  
Fixed Bed Reactor ◽  
Effect Of Particle Size ◽  
Downdraft Fixed Bed ◽  
Palm Kernel Shells

scholarly journals The Grindability of Biochars from Agroforestry Biomass Prepared under Different Torrefied Conditions

2019 ◽  
Vol 118 ◽  
pp. 01051
Author(s):  
Hewei Jiang ◽  
Yangtian Ye ◽  
Ping Lu
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Wheat Straw ◽  
Size Distribution ◽  
Mass Fraction ◽  
Fixed Bed ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Corn Straw ◽  
Agricultural Biomass

The torrefaction experiments of four biomass including agricultural biomass (corn straw (CS) and wheat straw (WS)) and forestry biomass (polar wood (PW) and cedar wood (CW)) were carried out in a fixed bed reactor at torrefaction temperature of 200-300°C and holding time of 10-60min, the effects of torrefaction temperature and holding time on biochar grindability based on the component analysis and the particle size distribution of ground biomass and biochars. The obtained results indicated that the mass fraction of ground biochar with particle size less than 150 μm increases with increasing torrefaction temperature, and the mass fraction of ground biochar with particle size less than 150 μm achieves 100%. The larger the λC, the better the grindability of biochar. The correlation between the grindability of the woody biochar and the λC is not as good as that of the straw biochar. The grindability of corn straw biochar and cedar wood biochar is improved with the increase of holding time at the same torrefaction temperature, however, the grindability of wheat straw biochar and polar wood biochar gets a little change, which can keep good grindability at higher torrefaction temperature large than 275°C.

Pyrolysis of Empty Fruit Bunch (EFB) in a Vertical Fixed Bed Reactor

2014 ◽  
Vol 695 ◽  
pp. 228-231 ◽  
Author(s):  
K. Azduwin ◽  
Mohd Jamir Mohd Ridzuan ◽  
A.R. Mohamed ◽  
S.M. Hafis
Keyword(s):  
Particle Size ◽  
Fossil Fuels ◽  
Pyrolysis Temperature ◽  
Hold Time ◽  
Maximum Yield ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Empty Fruit Bunch ◽  
Bio Oil

Uncontrolled uses of fossil fuels lead to serious energy problems and since Malaysia is one of the largest producers of palm oil in the world, it has caused a lot of waste such as empty fruit bunches (EFB) which can actually be converted into renewable energy via pyrolysis. In this work, firstly the characterizations of the EFB were analyzed such as elemental, proximate and component analysis. The pyrolysis experiment of empty fruit bunch using vertical fixed-bed reactor was conducted at different pyrolysis temperature range from 300 - 600 °C and the particle size of EFB was also varied from 125-250 μm with constant nitrogen flow rate of 100 cm3/min, heating rate of 30 °C/min, and 30 minutes hold time. For the effect of temperature, the optimum pyrolysis temperature was 500 °C to produce maximum yield of bio-oil which is 39.2 wt. % while 46.13 wt. % is the highest bio-oil yield produced at size of 500-710 μm for the effect of particle size. The analysis on bio-oil was conducted by using Fourier Transform Infrared (FTIR) with the results shows for the presents of phenol/alcohol group, ketones and C-O bond. The bio-oil obtained is in the acidic condition with pH 3.5.

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