Recovery of Molybdenum (VI) from Aqueous Solution with Packed Foam Column by Steady-State

2013 ◽  
Vol 641-642 ◽  
pp. 270-276
Author(s):  
Yong Qiang Zhang ◽  
Jing Wang ◽  
Mei Ling Shi ◽  
Xiao Xian Zhao
Keyword(s):  
Aqueous Solution ◽  
Steady State ◽  
Flow Rate ◽  
Recovery Rate ◽  
Surfactant Concentration ◽  
Separation Efficiency ◽  
Enrichment Ratio ◽  
Feed Flow Rate ◽  
Experimental Conditions ◽  
Distribution Density Function

The purpose of this study is to recover molybdenum (VI) from aqueous solution with packed foam column by steady-state operation using hexadecyl trimethyl ammonium chloride as the surfactant. The parameters include air and feed flow rate, packing layer heights, surfactant concentration and pH etc, then the macroscopical dynamics is studied. The experimental results show that there are little effects of liquor pH, air flowrate and surfactant concentration on recovery rate and enrichment ratio of molybdenum within experimental conditions, but with increase of feed flow rate, recovery rate and enrichment ratio all decline clearly, with increase of packing height, recovery rate enhances evidently, and enrichment ratio decreases slowly. The macroscopical dynamics show that the process can be regarded as first order reaction. The fluid flow pattern is close to piston, indicating that there is little liquid backmixing and in favor of advancing separation efficiency by analyzing variance and distribution density function.

Dynamic Simulation of the Boron Isotopes Separation by Chemical Exchange Method

2012 ◽  
Vol 442 ◽  
pp. 62-66 ◽  
Author(s):  
Jin Cui ◽  
Wei Jiang Zhang ◽  
Feng Hai Miao
Keyword(s):  
Flow Rate ◽  
Chemical Exchange ◽  
Dynamic Change ◽  
Abundance Ratio ◽  
Enrichment Ratio ◽  
Boron Isotopes ◽  
Rate Variation ◽  
Feed Flow Rate ◽  
Exchange Method ◽  
Isotopes Separation

Abstract The enrichment ratio of 10B in the top and bottom component with the dynamic change of feed fluctuation and periodic wave on the separation process of the boron isotopes separation by chemical exchange method had been studied and a dynamic model was set up. The results indicate that when the feed amount is in the column load limit, the dynamic responses of top and bottom separation plate match well with the condition when feed flow rate is invariable. While when the exchange column is overloaded, the feed flow rate variation influences 10B abundance ratio greatly. With the increasing of the fluctuation period, the longer the wave period, the bigger the amplitude around the average line in top product. However, big increase of feed fluctuation will reduce the 10B abundance ratio of bottom product.

scholarly journals FIXED-BED ADSORPTION OF AQUEOUS VANILLIN ONTO RESIN H103

2017 ◽  
Vol 18 (2) ◽  
pp. 94-104
Author(s):  
Rozaimi Abu Samah
Keyword(s):  
Aqueous Solution ◽  
Flow Rate ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Maximum Adsorption Capacity ◽  
Feed Flow Rate ◽  
Fixed Bed Column ◽  
Initial Concentration ◽  
Bed Height ◽  
Fixed Bed Adsorption

The main objective of this work was to design and model fixed bed adsorption column for the adsorption of vanillin from aqueous solution. Three parameters were evaluated for identifying the performance of vanillin adsorption in fixed-bed mode, which were bed height, vanillin initial concentration, and feed flow rate. The maximum adsorption capacity was increased more than threefold to 314.96 mg vanillin/g resin when the bed height was increased from 5 cm to 15 cm. Bohart-Adams model and Belter equation were used for designing fixed-bed column and predicting the performance of the adsorption process. A high value of determination coefficient (R2) of 0.9672 was obtained for the modelling of vanillin adsorption onto resin H103.

scholarly journals Continuous Lithium Extraction from Aqueous Solution Using Flow-Electrode Capacitive Deionization

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2913 ◽  
Author(s):  
Yuncheol Ha ◽  
Hye Bin Jung ◽  
Hyunseung Lim ◽  
Pil Sung Jo ◽  
Hana Yoon ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Flow Rate ◽  
Electrode Materials ◽  
Removal Rate ◽  
Chloride Ions ◽  
Water Evaporation ◽  
Efficient Production ◽  
Feed Flow Rate ◽  
Capacitive Deionization ◽  
Feed Stream

Flow-electrode-based capacitive deionization (FCDI) is a desalination process that uses electrostatic adsorption and desorption of ions onto electrode materials. It provides a continuous desalination flow with high salt removal performance and low energy consumption. Since lithium has been regarded as an essential element for the last few decades, the efficient production of lithium from the natural environment has been intensively investigated. In this study, we have extracted lithium ions from aqueous solution by using FCDI desalination. We confirmed that lithium and chloride ions could be continuously collected and that the salt removal rate depends on various parameters, including feed-flow rate and a feed saline concentration. We found that the salt removal rate increases as the feed-flow rate decreases and the feed salt concentration increases. Furthermore, the salt removal rate depends on the circulation mode of the feed solution (continuous feed stream vs. batch feed stream), which allows control of the desalination performance (higher capacity vs. higher efficiency) depending on the purpose of the application. The salt removal rate was highest, at 215.06 μmol/m−2s−1, at the feed rate of 3 mL/min and the feed concentration of 100 mg/L. We believe that such efficient and continuous extraction of lithium chloride using FCDI desalination can open a new door for the current lithium-production industry, which typically uses natural water evaporation.

scholarly journals Distillation optimization: Parameterized relationship between feed flow rate of a steady-state distillation column and heat duties of reboiler and condenser

2021 ◽  
Author(s):  
Ivan Sukin ◽  
Anatoly Tsirlin ◽  
Alexander Balunov ◽  
Ilya Starodumov
Keyword(s):  
Steady State ◽  
Flow Rate ◽  
Energy Demand ◽  
Distillation Column ◽  
Maximum Efficiency ◽  
Feed Flow Rate ◽  
Distillation Columns ◽  
Two Parameters ◽  
The Given ◽  
The Relationship

The paper considers the problem of maximum efficiency for the system of distillation columns. Columns in such systems are connected in parallel or sequential way. The mixture being separated is assumed to be close to ideal one. Authors parameterize the relationship between feed flow rate and heat duties of a steady-state binary distillation column using two parameters: the reversible efficiency and the irreversibility coefficient. This relationship is later being used to solve the problems about optimal distribution of heat and feed flows within the system. The results obtained allow to estimate minimum heat energy demand for distillation of the given feed flow, maximum performance and efficiency of the system.

Effect of Feed-Flow Rate in a Solid-Liquid Hydrocyclone Based on Total Solid Recovery Equation

2017 ◽  
Vol 751 ◽  
pp. 173-179
Author(s):  
Pichai Soison ◽  
Pakpoom Supachart ◽  
Pratarn Wongsarivej
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Concentration Ratio ◽  
Separation Efficiency ◽  
Total Solid ◽  
Feed Flow Rate ◽  
Solid Concentration ◽  
Flow Ratio ◽  
Flow Rates ◽  
Solid Liquid

Many studies of hydrocyclones have confirmed that increasing the feed-flow rate results in a higher separation efficiency. The purpose of this study was to investigate the separation efficiency for a 100 mm solid–liquid hydrocyclone with 1 and 2 wt% solid concentrations at feed-flow rates of 2, 3, 4, 5 and 6 m3/hr. The solid concentration and particle size distribution were analysed using drying–weighing and a particle-size analyser (Mastersizer 2000), respectively. The experimental results indicated that an increase in feed-flow rate from 2 to 4 m3/hr produced decreased separation efficiency. However, when the feed-flow rates increased from 4 to 6 m3/hr, the separation efficiency increased. Furthermore, the higher the feed-flow rate, the smaller the cut size. A novel separation efficiency equation in terms of the concentration ratio and flow ratio is also proposed.

scholarly journals The separation of microscale HA in aqueous solution by foam separation technique

2019 ◽  
Vol 21 (4) ◽  
pp. 66-71
Author(s):  
Shao Wenyao ◽  
Gong Xiao ◽  
Cui Shuming ◽  
Lin Ying ◽  
Lu Yinghua ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Recovery Rate ◽  
Orthogonal Experiment ◽  
Extraction Process ◽  
Separation Technique ◽  
Enrichment Ratio ◽  
Liquid Volume ◽  
Optimum Process ◽  
Process Conditions ◽  
Foam Separation

Abstract Hyaluronic acid (HA) has important applications in fields of health care products, cosmetics and clinical medical. However, the unique physiological properties of HA make cost of its traditional separation and extraction process relatively high. Foam separation technique has simple, gentle and efficient advantages on the separation of substances with surface activity by using bubbles as the separation medium. In this paper, natural surfactant CocamideBetaine (CAPB) was used as a foaming agent to explore the technology of microscale HA in aqueous solution by foam separation. The optimum process conditions were determined based on the recovery rate and enrichment ratio of HA by single factor and orthogonal experiment: at room temperature, pH = 7, separating air velocity (v) = 350 mL/min, HA concentration (CHA) = 50 mg/L, adding liquid volume (V) = 200 mL, collecting time (tcol) = 10 min, CAPB concentration (CCAPB) = 0.035 g/L. Under these conditions, HA enrichment ratio (E) equals 6.821 and HA recovery rate (R) equals 66.425%.

scholarly journals Adsorção de cromo hexavalente usando rejeito de beneficiamento de carvão em modelo de batelada e coluna de leito fixo

2020 ◽  
Vol 4 (2) ◽  
pp. 121
Author(s):  
Keila Guerra Pacheco Nunes ◽  
Nathali Ribeiro Batistel ◽  
Dafne Barbosa ◽  
Ivan Reis Rosa ◽  
Ivone Vanessa Jurado Davila ◽  
...  
Keyword(s):  
Flow Rate ◽  
Performance Metrics ◽  
Fixed Bed ◽  
Coal Waste ◽  
Feed Flow Rate ◽  
Inlet Concentration ◽  
Experimental Conditions ◽  
Fixed Bed Column ◽  
Solid Adsorbent ◽  
Effects Of Ph

The objective of this work is to utilize a coal beneficiation tailing from Moatize (Mozambique) for the adsorption of hexavalent chromium from water in batch model and fixed bed column. Coal waste was used in particle size between 0.7 and 1.5 mm. The effects of pH, contact time and solid adsorbent concentration were analyzed by batch experiments. The results indicated that it was possible to obtain 98.6% of removal under the experimental conditions of pH 2, 10 h of process and 8 g.L-1 of solid adsorbent. From these experimental results, equilibrium isotherms were build and Langmuir and Sips models presented a better fit to the experimental data. The adsorption of chromium hexavalent from aqueous solution onto coal waste was investigated in a fixed bed column at 298 K. The effects of the inlet concentration, feed flow rate, bed depth on adsorption were investigated. In general, the evaluated parameters improved as a results increase in a Z (bed deep) and decreases in Q (feed flow rate). These performance metrics also improved as C0 (inlet concentration) was increased.

Experimental and Modelling of Aqueous Radioactive Waste Treatment by Ultrafiltration

2018 ◽  
Vol 69 (5) ◽  
pp. 1149-1151
Author(s):  
Laura Ruxandra Zicman ◽  
Elena Neacsu ◽  
Felicia Nicoleta Dragolici ◽  
Catalin Ciobanu ◽  
Gheorghe Dogaru ◽  
...  
Keyword(s):  
Flow Rate ◽  
Suspended Solids ◽  
Waste Treatment ◽  
Operating Pressure ◽  
Feed Flow Rate ◽  
Permeate Flux ◽  
Independent Variables ◽  
Opposite Trend ◽  
Process Factors ◽  
Volumetric Flux

Ultrafiltration of untreated and pretreated aqueous radioactive wastes was conducted using a spiral-wound polysulphonamide membrane. The influence of process factors on its performances was experimental studied and predicted. Permeate volumetric flux and permeate total suspended solids (TSS) were measured at different values of feed flow rate (7 and 10 m3/h), operating pressure (0.1-0.4 MPa), and feed TSS (15 and 60 mg/L). Permeate flux (42-200 L/(m2�h)) increased with feed flow rate and operating pressure as well as it decreased with an increase in feed TSS, whereas permeate TSS (0.1-33.2 mg/L) exhibited an opposite trend. A 23 factorial plan was used to establish correlations between dependent and independent variables of ultrafiltration process.

Utilization of Waste of Enzymes Biomass as Biosorbent for the Removal of Dyes from Aqueous Solution in Batch and Fluidized Bed Column

2020 ◽  
Vol 71 (1) ◽  
pp. 1-12
Author(s):  
Salman H. Abbas ◽  
Younis M. Younis ◽  
Mohammed K. Hussain ◽  
Firas Hashim Kamar ◽  
Gheorghe Nechifor ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Particle Size ◽  
Adsorption Capacity ◽  
Fluidized Bed ◽  
Flow Rate ◽  
Fungal Biomass ◽  
Solution Flow Rate ◽  
Maximum Adsorption Capacity ◽  
Solution Flow

The biosorption performance of both batch and liquid-solid fluidized bed operations of dead fungal biomass type (Agaricusbisporus ) for removal of methylene blue from aqueous solution was investigated. In batch system, the adsorption capacity and removal efficiency of dead fungal biomass were evaluated. In fluidized bed system, the experiments were conducted to study the effects of important parameters such as particle size (701-1400�m), initial dye concentration(10-100 mg/L), bed depth (5-15 cm) and solution flow rate (5-20 ml/min) on breakthrough curves. In batch method, the experimental data was modeled using several models (Langmuir,Freundlich, Temkin and Dubinin-Radushkviechmodels) to study equilibrium isotherms, the experimental data followed Langmuir model and the results showed that the maximum adsorption capacity obtained was (28.90, 24.15, 21.23 mg/g) at mean particle size (0.786, 0.935, 1.280 mm) respectively. In Fluidized-bed method, the results show that the total ion uptake and the overall capacity will be decreased with increasing flow rate and increased with increasing initial concentrations, bed depth and decreasing particle size.

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