A computationally efficient multi-scale simulation of a multi-stage fixed-bed reactor for methanol to propylene reactions

2016 ◽  
Vol 150 ◽  
pp. 104-116 ◽  
Author(s):  
Xun Huang ◽  
Hui Li ◽  
Hu Li ◽  
Wen-De Xiao
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Computationally Efficient ◽  
Multi Scale ◽  
Multi Stage

Study of Discrete and Multi-Tube Pass Number Inorganic Membrane Reactor

2011 ◽  
Vol 233-235 ◽  
pp. 3036-3039
Author(s):  
Yun Bo Jiang ◽  
Ke Zheng Zhang
Keyword(s):  
Membrane Reactor ◽  
Fixed Bed ◽  
Butyl Alcohol ◽  
Fixed Bed Reactor ◽  
Inorganic Membrane ◽  
Membrane Area ◽  
Stage Separation ◽  
Multi Stage ◽  
Transmission Area ◽  
Alcohol Dehydrogenation

Discrete and Multi-tube Pass Number Inorganic Membrane Reactor offers supplements to single-tube membrane reactor, referencing heat exchanger can provide larger transmission area and plate column can realize multi-stage separation. It realizes the reaction and separation occurs simultaneously many times, and can change the membrane area according to the need, so that reaction and separation process can be matched better. Discrete and multi-tube membrane reactor and fixed bed reactor was experimented in sec-butyl alcohol dehydrogenation system at 150-225, the result shows the new membrane reactor structure is reasonable.

scholarly journals Biodegration of BPA and HHCB from Waste Water by Multi-Stage Biofilm Processes

2017 ◽  
pp. 156-163 ◽  
Author(s):  
Tiina Mononen ◽  
Sebastián Coloma ◽  
Anna Lehtonen ◽  
Anu Kapanen ◽  
Minna Vikman ◽  
...  
Keyword(s):  
Waste Water ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Fixed Bed ◽  
Wood Chips ◽  
Municipal Waste ◽  
Fixed Bed Reactor ◽  
Second Stage ◽  
Gray Water ◽  
Multi Stage ◽  
Gradient Gel Electrophoresis

The removal of bisphenol A and 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]2-benzopyran (HHCB), which both are widely used chemicals and known endocrine disrupters, was studied applying two biofilm processes. One of the processes was a rotating bed biofilm process (RBBR) in which waste water and small plastic pieces were rotated in cylindrical reactors by air supply. The plastic pieces served as a carrier material for biofilm as the other process, fixed bed reactor (FBR) applied wood chips. RBBR was fed with municipal waste water and FBR with artificial gray water. Preliminary results show that both experiment setups remove efficiently BOD, COD and suspended solids from waste water. BPA and HHCB were added to municipal waste water and artificial gray water to study their removal in RBBR and FBR. In RBBR, BPA removal was 10 – 29 % in the first stage and 68 – 83 % in the second stage. HHCB was removed 3 – 4 % in the first stage and 70 – 79 % in the second stage of RBBR. In FBR, the first stage removed 31 – 97 % of BPA and the second stage 80 – 100 %. 84 – 95 % and 96 – 99 % of HHCB was removed in the first and second stage, respectively. However, the percentage of removed BPA and HHCB decreased over the course of time, which refers to adsorption and saturation of BPA and HHCB to wood chips at the beginning of BPA and HHCB addition. The experiments will be continued and adaptation of microbial is expected in the latter stages of the setups. Denaturing gradient gel electrophoresis is applied to study differences in bacteria and fungi diversities in different steps of the multi-stage RBBR and FBR. In future, also 454 pyrosequencing will be applied.

Experimental and Model Based Study of the Hydrogenation of Acrolein to Allyl Alcohol

2005 ◽  
Vol 3 (1) ◽  
Author(s):  
Christof Hamel ◽  
Michael Bron ◽  
Peter Claus ◽  
Andreas Seidel-Morgenstern
Keyword(s):  
Allyl Alcohol ◽  
Membrane Reactor ◽  
Fixed Bed ◽  
Packed Bed ◽  
Membrane Reactors ◽  
Fixed Bed Reactor ◽  
Reactor Model ◽  
Multi Stage ◽  
Parallel Reactions ◽  
Kinetics Of

The hydrogenation of acrolein was investigated experimentally in a fixed-bed reactor (FBR) using several classical and a newly developed hydrogenation catalyst. The aim was to evaluate selectivity and yield with respect to the desired product allyl alcohol. The kinetics of the two main parallel reactions of acrolein hydrogenation were quantified for a supported silver catalyst which offered the highest performance. In a second part the reaction kinetics identified were used in a theoretical study applying a simplified isothermal 1D reactor model in order to analyse the hydrogenation of acrolein performed in single- and multi-stage packed bed membrane reactors (PBMR). The goal of the simulations was to evaluate the potential of dosing one reactant in a distributed manner using one or several membrane reactor stages. The results achieved indicate that the membrane reactor concept possesses the potential to provide improved yields of allyl alcohol compared to conventional co-feed fixed-bed operation.

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

Modeling of aerated upflow fixed bed reactors for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 85-92 ◽  
Author(s):  
J. Behrendt
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Gas Phase ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Bulk Liquid ◽  
Initial Value ◽  
Fixed Bed Reactors ◽  
Number Of Cells

A mathematical model for nitrification in an aerated fixed bed reactor has been developed. This model is based on material balances in the bulk liquid, gas phase and in the biofilm area. The fixed bed is divided into a number of cells according to the reduced remixing behaviour. A fixed bed cell consists of 4 compartments: the support, the gas phase, the bulk liquid phase and the stagnant volume containing the biofilm. In the stagnant volume the biological transmutation of the ammonia is located. The transport phenomena are modelled with mass transfer formulations so that the balances could be formulated as an initial value problem. The results of the simulation and experiments are compared.

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