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Abstract. Hydrogenation of o-nitroanisole to o-anisidine was investigated using Pd-C catalyst in a stirred slurry reactor. The initial rate data were analyzed to check the importance of mass ...
The dynamic operation of an ideal continuous-flow stirred tank slurry reactor for propylene polymerization has been studied. A simple model is developed, which could be used for optimal computer … Expand. 16. Save. Modeling and simulation of an industrial slurry phase ethylene polymerization reactor: effect of reactor operating variables.
DOI: 10.1016/0009-2509(92)85075-M Corpus ID: 97453011; Raney-nickel catalyzed hydrogenations: Gas-liquid mass transfer in gas-induced stirred slurry reactors @article{Dietrich1992RaneynickelCH, title={Raney-nickel catalyzed hydrogenations: Gas-liquid mass transfer in gas-induced stirred slurry reactors}, author={E. Dietrich and C. …
It operates the process at 10e80 atm at around 70e150 C. Ziegler-Natta is widely used in industries under the slurry process using a continuous stirred tank reactor (Wang et al., 2018). In this ...
DOI: 10.1016/J.CEJ.2003.08.005 Corpus ID: 95179115; Mechanisms of physical and reaction enhancement of mass transfer in a gas inducing stirred slurry reactor @article{Ruthiya2003MechanismsOP, title={Mechanisms of physical and reaction enhancement of mass transfer in a gas inducing stirred slurry reactor}, author={K. C. …
Slurry stirred tanks have been more often investigated by ERT for the assessment of the solid concentration distribution under continuous agitation or transient conditions, (e.g. Stanley and Bolton, 2008; Hosseini et al., 2010; Tahvildarian et al., 2011; Harrison et al., 2012). On the other hand, at the best of our knowledge, ERT data on the ...
Stirred-Tank Slurry Adsorption. In the stirred tank, slurry operation, a batch of liquid is added to a powdered adsorbent (such as activated carbon) in an agitated vessel to form a slurry.This is shown in the Figure below:. The main application of this mode of operation is the removal of very small amounts of dissolved, and relatively large molecules, such as …
The interactions between slurry, grinding media and mill structure are modelled by two-way couplings between the PFEM, the DEM and the FEM models. The coupled model of the present study is used to predict the motion of slurry and grinding media, and to calculate the power draw during wet comminution in a pilot scale horizontal stirred media mill.
Abstract. Three precipitated iron catalysts were evaluated in a stirred tank slurry reactor to determine their performance during Fischer-Tropsch synthesis under steady-state conditions. High syngas conversions (>80%) were achieved in all three tests, and the catalyst deactivation rates were moderate (1.3–2.1% per day).
At the end of the grinding chamber, the slurry leaves the stirred media mill while the grinding media is kept inside the mill by a screen cartridge. An important property of the comminution in wet stirred media mills is that the contacts between grinding media bodies cause the number of stress events per unit time and unit volume to be very ...
Modelling of interactions between slurry, grinding media and mill structure in a horizontal wet stirred media mill. • Slurry modelled as either Newtonian or non …
The key to successful slurry preparation is a thorough and consistent mix, which can be challenging to achieve without the right equipment. Orbital shakers are …
Mass transfer and reactivity experiments using two different slurry systems and two different Pd-catalysed reactions, i.e., oxidation of glucose (aqueous phase) and hydrogenation of a-methyl styrene (organic phase), with both hydrophobic carbon and hydrophilic silica catalyst supports, were performed in a laboratory scale surface aeration ...
1. Introduction. Stirred tank reactors are prevalent in many industrial applications where a high degree of solid–fluid contact in the multi-phase reaction systems is necessary for optimum performance (Nienow, 1968; Oldshue, 1983; Shamlou and Koutsakos, 1989).Slurry reactors are typically a mixing system containing a particulate …
Here's the best way to solve it. Continuous heating of slurry in an agitated tank. A slurry is being heated by pumping it through a well-stirred heating tank, as shown in Fig. 15B.8. The inlet temperature of the slurry is T; and the temperature of the outer surface of the steam coil is Ts. Use the following symbols: V p, C volume of the ...
The dominant factors influencing particle homogeneity and liquid mixing in stirred tank slurry reactors are particle size and density, impeller design, impeller speed and tank geometry (Carletti ...
The computational model and results discussed in this work would be useful for extending the applications of CFD models for simulating large stirred slurry reactors. AB - A comprehensive computational fluid dynamics CFD model was developed in the present study to gain insight into the solid suspension in a stirred slurry reactor.
Coefficient in Stirred Vessel for Coal-Water Slurry Based on the Taguchi Method C.M.Raguraman, 1 A.Ragupathy, 1 andL.Sivakumar 2 Mechanical Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India ... e concentration of coal slurry could be maintained from % to % which is able to feed into the gasi cation without any feeding ...
Abstract. Solid distribution was investigated in slurries stirred by multiple axial impellers in continuous flow equipment. The solid concentration profiles are described by …
DOI: 10.1021/acs.iecr.3c02093 Corpus ID: 264061297; Modeling of Slurry Phase Olefin Polymerizations in a Semibatch Well-Mixed Stirred Tank: Effect of Mass Transfer @article{Zhang2024ModelingOS, title={Modeling of Slurry Phase Olefin Polymerizations in a Semibatch Well-Mixed Stirred Tank: Effect of Mass Transfer}, …
At the end of the grinding chamber, the slurry leaves the stirred media mill while the grinding media is kept inside the mill by a screen cartridge. An important property of the comminution in wet stirred media mills is that the contacts between grinding media bodies cause the number of stress events per unit time and unit volume to be very high.
The performance of carbon-supported catalysts (Pt/C, Ru/C, Pd/C) was explored in the ECH of phenol and guaiacol in a stirred slurry electrochemical reactor where the cathode and anode compartments were separated by a Nafion® 117 membrane. Acid (H 2 SO 4) and neutral (NaCl) catholytes were used. Pt/C showed superior activity …
Magnetic Slurry Stirrer. The magnetic slurry stirring unit is required whenever a dispenser is utilized. The diamond particles in a bottle of slurry fall out of suspension with gravity. The stirring unit comes with a magnet that is dropped into one of the two glass bottles included with the dispensing bar. The bottle is placed into the front ...
In this paper, the status of slurry phase polyethylene processes in China is briefly introduced. Two of the most important licensers of continuous stirred tank reactor (CSTR) type slurry phase polyethylene processes, namely, Hostalen (Licensed by Basell), CX (Licensed by Mitsui), with a dual- or three-reactor are reviewed.
The role of slurry rheology in stirred media milling of quartzite has been investigated by varying important grinding parameters such as media bead density and size, addition of chemicals, solids concentration, stirrer rotational speed as well as the combined effect of these factors. Media bead density has an evident but complex effect on stirred …
The Fischer–Tropsch synthesis (FTS) was studied using mesoporous silica-supported bimetallic Co–Ni catalyst in a fixed-bed reactor (FBR) and a slurry continuously stirred tank reactor (CSTR) under different temperatures (from 280°C to 300°C) with syngas ratio of 2 and a total pressure of 3.5 MPa.
Slurry electrolysis is a multi-tank series process, whereby the slurry with varied solid concentrations enters the next stirred tank through the overflow mode. It is therefore of great significance to the control of production conditions to clarify the relationship between the solids holdup and solid–liquid mixing homogeneity.
This work aims to monitor the slurry-phase polyolefin polymerization in the continuous stirred-tank reactor (CSTR) based on the reliable acoustic emission (AE) method utilizing the cost-effective data acquisition system. This study found that the reaction rate profile, slurry concentration, increase in the fine particles, and abnormal conditions …
Slurry electrolysis (SE) is a hydrometallurgical process that has a good potential for application in the extraction of metals from polymetallic complex mines. The particle size (d), impeller diameter (D) and liquid level (H) on the effect of solid-liquid suspension characteristics were investigated numerically, which has been verified by …
Slurry electrolysis (SE) is a one-step green electrochemical technology used for the treatment of complex ores and solid waste. To explore the solid–liquid suspension …
A comprehensive computational fluid dynamics CFD model was developed in the present study to gain insight into the solid suspension in a stirred slurry reactor. The preliminary simulations highlighted the need for the correct modeling of the interphase drag force. A two-dimensional model problem was then developed using CFD to understand the influence …
Wet comminution is an important process in the mineral processing industry. Modelling of wet comminution in stirred media mills requires the simultaneous modelling of grinding media, a moving internal stirrer, and slurry. In the present study, a novel approach for modelling the physical interactions between slurry, grinding media and mill structure in a …
The Fischer–Tropsch synthesis (FTS) was studied using mesoporous silica-supported bimetallic Co–Ni catalyst in a fixed-bed reactor (FBR) and a slurry continuously stirred tank reactor (CSTR) under different temperatures (from 280°C to 300°C) with syngas ratio of 2 and a total pressure of 3.5 MPa.
Wet ultra-fine grinding of a limestone powder (< 100 μm) has been investigated in a stirred media mill with respect to the effect of slurry rheology.The grinding results obtained by various parameters (i.e., molecular weight of a dispersant, solids concentration, additive dosage, addition method and beads load) are evaluated in terms …
For the industrial slurry electrolysis, antimony ores were used as the solid phase (ρ = 3300 kg/m 3), whereas the mixture of HCl-NH 4 Cl was used as the liquid phase (ρ = 1227 kg/m 3, μ = 0.001 Pa.s).As shown in Fig. 3, for the industrial SE stirring tank, the height of the clear liquid layer increased with the increase in the particle size.
This study thus guides the selection of operating variables within the stirred tank slurry reactor to optimise tank homogeneity with respect to the suspension of the …
Approximately 50 million tons of HDPE are produced annually around the worldwide by slurry phase processes. In this paper, the status of slurry phase …
Color map of axial slip velocity for particles of (a) dp=774 µm (a) and (b) dp=115 µm. Water velocity vector plot (c). The color scale is in [m/s]. These maps have been obtained by linear interpolation of the experimental data. In order to examine the effect of liquid turbulence on the particle settling behavior, the terminal velocity of a ...
Performance Study of stirred tank slurry reactor and fixed‐bed reactor using bimetallic Co–Ni mesoporous silica catalyst for fischer–tropsch synthesis - Sun - 2018 - …
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