scholarly journals Optimization of the Production of 1,1-Diethoxybutane by Simulated Moving Bed Reactor

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 189
Author(s):  
Jasper Spitters ◽  
Jonathan C. Gonçalves ◽  
Rui P. V. Faria ◽  
Alírio E. Rodrigues
Keyword(s):  
Switching Time ◽  
Fixed Bed ◽  
Experimental Results ◽  
Simulated Moving Bed ◽  
Multicomponent Mixtures ◽  
Optimum Conditions ◽  
Moving Bed ◽  
Fine Chemistry ◽  
Desorbent Consumption ◽  
Good Agreement

Simulated moving bed technology is applied in the field of pharmaceutical, petrochemical and fine chemistry. It shows capability in separating multicomponent mixtures up to high purities. In this work, an attempt was made to optimize the production of 1,1-diethoxybutane (DEB), using the simulated moving bed technology. A fixed bed model is made with good agreement with experimental results. This fixed bed model was expanded to a simulated moving bed model. This model was used to determine the optimum conditions regarding the switching time and flowrates in each section. From this model, the optimum switching time was found to be 2.4 min, and the ratio of liquid flowrate over the solid flowrate in Section 1Section 2Section 3 and Section 4 of the SMBR was found to be 4.24, 1.77, 3.03 and 1.35, respectively. Under those conditions, the productivity was 19.8 kg DEB per liter of adsorbent per day, and the desorbent consumption was 6.1 L of ethanol per kg of DEB. The results were obtained with a minimum purity of the extract and raffinate of 97%.

scholarly journals Modeling for Taxol® Separation in a simulated moving bed

2010 ◽  
Vol 53 (6) ◽  
pp. 1433-1441
Author(s):  
Marco Aurelio Cremasco ◽  
Axel Nicolas Starqui
Keyword(s):  
Hybrid Method ◽  
Multicomponent Mixture ◽  
Simulated Moving Bed ◽  
Moving Bed ◽  
Numerical Resolution ◽  
Anti Cancer ◽  
Adsorption Processes ◽  
Resolution Strategy ◽  
Cancer Agent ◽  
Good Agreement

This work presents an alternative numerical resolution strategy for a model to describe the dynamic of linear adsorption processes involving multicomponent mixture of taxanes with Taxol® (paclitaxel), a powerful anti-cancer agent, and non-identified impurities, in a Simulated Moving Bed (SMB) system. To solve the model, a hybrid method were used. The liquid concentration inside the particles was found analytically and was related with the liquid bed concentration using Duhamel's theorem. The results from simulation were compared with experimental ones from the literature, showing a good agreement, which demonstrated the applicability of the model and of the hybrid resolution proposed.

scholarly journals Influence of Torrefaction and Pelletizing of Sawdust on the Design Parameters of a Fixed Bed Gasifier

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 3018
Author(s):  
Hao Luo ◽  
Lukasz Niedzwiecki ◽  
Amit Arora ◽  
Krzysztof Mościcki ◽  
Halina Pawlak-Kruczek ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Experimental Results ◽  
Design Parameters ◽  
Small Scale ◽  
Complete Model ◽  
Significant Cost ◽  
Co2 Gasification ◽  
Single Pellet ◽  
Higher Temperature ◽  
Good Agreement

Gasification of biomass in fixed bed gasifiers is a well-known technology, with its origins dating back to the beginning of 20th century. It is a technology with good prospects, in terms of small scale, decentralized power co-generation. However, the understanding of the process is still not fully developed. Therefore, assessment of the changes in the design of a gasifier is typically performed with extensive prototyping stage, thus introducing significant cost. This study presents experimental results of gasification of a single pellet and bed of particles of raw and torrefied wood. The procedure can be used for obtaining design parameters of a fixed bed gasifier. Results of two suits of experiments, namely pyrolysis and CO2 gasification are presented. Moreover, results of pyrolysis of pellets are compared against a numerical model, developed for thermally thick particles. Pyrolysis time, predicted by model, was in good agreement with experimental results, despite some differences in the time when half of the initial mass was converted. Conversion times for CO2 gasification were much longer, despite higher temperature of the process, indicating importance of the reduction reactions. Overall, the obtained results could be helpful in developing a complete model of gasification of thermally thick particles in a fixed bed.

Process Intensification in a “Simulated Moving-Bed” Heat Regenerator

2008 ◽  
Vol 130 (9) ◽  
Author(s):  
D. S. Murthy ◽  
S. V. Sivakumar ◽  
Keshav Kant ◽  
D. P. Rao
Keyword(s):  
Heat Transfer ◽  
Gas Flow ◽  
Fixed Bed ◽  
Process Intensification ◽  
Thermal Recovery ◽  
Simulated Moving Bed ◽  
Thermal Regeneration ◽  
Heat Transfer Intensification ◽  
Moving Bed ◽  
High Heat Transfer

The solid-gas contacting for thermal storage and thermal recovery is generally carried out in fixed-bed regenerators. Compared to a fixed bed, higher thermal recovery can be achieved in a moving bed with countercurrent flow of gas and solids. However, the moving beds have not been widely used due to difficulties in solid handling. The relative movement of the bed to the gas flow can be simulated in a fixed bed by moving the inlet and outlet ports of the gas along the length of the bed. Similar simulated moving beds are already in use for adsorptive separation of liquid mixtures in chemical industries. A novel moving-port system is proposed to achieve simulated moving-bed operation in a fixed bed. We have carried out studies to evaluate the relative performance of the fixed and the simulated moving-bed heat regenerators. We have examined the feasibility of replacing a set of three blast furnaces and thermal regeneration of an adsorption bed with the simulated moving-bed regenerator. It is found that high-heat transfer intensification can be achieved. The results indicate that three blast-furnace stoves can be replaced by a simulated moving-bed regenerator of volume of about 100 times smaller than the stoves. The heat-transfer intensification is high enough to carry out thermal regeneration of the adsorption beds in a cycle time that is in the range of the pressure swing adsorption, which is favored for its faster rate of regeneration.

Process Intensification in a ‘Simulated Moving-Bed’ Heat Regenerator

Volume 4 ◽  
2004 ◽  
Author(s):  
D. S. Murthy ◽  
S. V. Sivakumar ◽  
Keshav Kant ◽  
D. P. Rao
Keyword(s):  
Heat Transfer ◽  
Gas Flow ◽  
Fixed Bed ◽  
Process Intensification ◽  
Thermal Recovery ◽  
Simulated Moving Bed ◽  
Thermal Regeneration ◽  
Heat Transfer Intensification ◽  
Moving Bed ◽  
High Heat Transfer

The solid-gas contacting for thermal storage and thermal recovery is generally carried out in fixed-bed regenerators. Compared to a fixed bed, higher thermal recovery can be achieved in a moving bed with countercurrent flow of gas and solids. However, the moving beds have not been widely used due to difficulties in solid handling. The relative movement of the bed to the gas flow can be simulated in a fixed bed by moving the inlet and outlet ports of the gas along the length of the bed. Similar simulated moving-beds are already in use for adsorptive separation of liquid mixtures in chemical industries. A Novel Moving-Port system is proposed to achieve simulated moving-bed operation in a fixed bed. We have carried out studies to evaluate the relative performance of the fixed and the simulated moving bed heat regenerators. We have examined the feasibility of replacing a set of three blast furnaces and thermal regeneration of an adsorption bed with the simulated moving-bed regenerator. It is found that high heat transfer intensification can be achieved. The results indicate that the volume of the Simulated Moving-Bed regenerator required is about 100 times smaller than the blast-furnace stoves. The heat transfer intensification is high enough to carry out thermal regeneration of the adsorption beds in a cycle time that is in the range of the pressure swing adsorption, which is favored for its faster rate of regeneration.

scholarly journals Hydrodynamic modelling of complex fixed bed geometries in simulated moving bed adsorption processes

2015 ◽  
Vol 132 ◽  
pp. 46-58 ◽  
Author(s):  
L. Fangueiro Gomes ◽  
F. Augier ◽  
D. Leinekugel-le-Cocq ◽  
I. Vinkovic ◽  
S. Simoëns
Keyword(s):  
Fixed Bed ◽  
Simulated Moving Bed ◽  
Hydrodynamic Modelling ◽  
Moving Bed ◽  
Adsorption Processes

Inducing Frictional Force to Enhance the Transient Response in Beams

2019 ◽  
Vol 22 (2) ◽  
pp. 88-93
Author(s):  
Hamed Khanger Mina ◽  
Waleed K. Al-Ashtrai
Keyword(s):  
Numerical Analysis ◽  
Transient Response ◽  
Frictional Force ◽  
Damping Ratio ◽  
Experimental Results ◽  
Damping Capacity ◽  
Tightening Force ◽  
Contact Areas ◽  
Good Agreement ◽  
Ansys Workbench

This paper studies the effect of contact areas on the transient response of mechanical structures. Precisely, it investigates replacing the ordinary beam of a structure by two beams of half the thickness, which are joined by bolts. The response of these beams is controlled by adjusting the tightening of the connecting bolts and hence changing the magnitude of the induced frictional force between the two beams which affect the beams damping capacity. A cantilever of two beams joined together by bolts has been investigated numerically and experimentally. The numerical analysis was performed using ANSYS-Workbench version 17.2. A good agreement between the numerical and experimental results has been obtained. In general, results showed that the two beams vibrate independently when the bolts were loosed and the structure stiffness is about 20 N/m and the damping ratio is about 0.008. With increasing the bolts tightening, the stiffness and the damping ratio of the structure were also increased till they reach their maximum values when the tightening force equals to 8330 N, where the structure now has stiffness equals to 88 N/m and the damping ratio is about 0.062. Beyond this force value, increasing the bolts tightening has no effect on stiffness of the structure while the damping ratio is decreased until it returned to 0.008 when the bolts tightening becomes immense and the beams behave as one beam of double thickness.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

Sign in / Sign up

Export Citation Format

Share Document