packed column Articles
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A brief introduction to DiatoSorb-W
DiatoSorb-W is a diatomaceous earth material that Restek will sell in bulk and in packed columns, uncoated and coated (with a liquid phase of your choice), which will replace Chromosorb-W packings. For those of you who may not know, the “W” stands for “white”, and is simply the color of the untreated, uncoated material. If your method references USP S1A, or ...
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Research on mass transfer columns: passe?
Since university research on mass transfer columns has decreased significantly in recent years, it is discussed whether the current knowledge of mass transfer technology for trays, packing materials, and column internals is sufficient to design energy- and cost-efficient systems. Points of view are described that have not yet been clarified from an industrial position and should play an important ...
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GC Analyses of Polynuclear Aromatic Hydrocarbons
Polynuclear aromatic hydrocarbons (PAHs) can be separated by packed column or capillary column gas chromatography. An SPB-5 bonded phase fused silica capillary column separates the 16 PAHs considered priority pollutants in wastewater by the US Pal SP-301, a liquid crystal stationary phase in packed GC columns, resolves benzo(e)pyrene and benzo(a)pyrene. This publication discusses conditions, ...
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Influence of liquid redistributors on the mass-transfer efficiency of packed columns
In industrial mass-transfer columns liquid distributors and redistributors are used to mix the liquid after a certain random packing or structured packing height before it is applied to the next bed. The purpose of this is to counter a possible deterioration of the mass-transfer efficiency along the height of the column as a result of wall flow tendency of the liquid or to minimize the ...
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Separation and identification of organic compounds from thermally dissolved Shengli lignite in a methanol/benzene mixed solvent
Thermal dissolution of Shengli lignite was conducted in a methanol/benzene mixed solvent at 240°C for 1 h. The soluble fraction was sequentially eluted with petroleum ether (PE) and carbon disulfide (CDS)/PE mixed solvents with increased CDS to PE ratio through a silica gel–packed column. A series of normal alkanes, polycyclic aromatics, methyl alkanoates, alkanoic acids, and fatty acid amides ...
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Petroleum/Chemicals Application Guide
This guide contains information about Supelco products and technology for performing detailed hydrocarbon analysis by chromatographic methods. Various applications are discussed; including, simulated distillation, polynuclear aromatic hydrocarbons, phenols / polymers, petrochemical analysis, high resolution and high speed analyses, and packed column applications. Columns used range from the ...
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Transport of Edible Oil Emulsions in Clayey Sands: One-Dimensional Column Results and Model Development
Abstract: The transport and retention of a soybean oil-in-water emulsion was evaluated in laboratory columns packed with a medium to fine clayey sand amended with varying amounts of kaolinite. Results from these experiments demonstrated that appropriately prepared soybean oil-in-water emulsions can be distributed in clayey sand at least 80 cm away from injection point. Kaolinite addition to the ...
By Redox Tech
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Biosorption of lead by the immobilised fungus Phanerochaete chrysosporium in a packed bed column
Biosorption of lead by immobilised Phanerochaete chrysosporium over two successive cycles of sorption-desorption was investigated in a continuously operated packed bed column. The breakthrough curves in each sorption cycle were measured as a function of different bed depths in the column at an inlet lead concentration of 40 mg/L. The values of various breakthrough parameters obtained in the study ...
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Tri-NOx Multi-Chem Wet Scrubber. Case Study of Our NOx Scrubber in a Hydroprocessing Plant.
Criterion Catalyst Co. L.P. is the world's largest supplier of catalysts for hydroprocessing, including hydrotreating applications. The company is also a leading supplier of reforming and specialty catalysts for the refining industry. Criterion's facility in Azusa, CA installed a Tri-NOx Mult-Chem scrubber with a 3000 cfm capacity at 250 lbs./hr. of NOx. The system has four polypropylene ...
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Analyze Trace Amounts of Solvents in Water Using Packed Column GC
Glass or stainless steel columns containing 80/120 Carbopack B/3% SP-1500 packing can be used to analyze water-based samples for ppm to low percentage levels of many organic compounds. This bulletin describes minimum detection limits and maximum capacity of these columns, adsorption and memory effects, and other factors that affect component quantitation. Problems are defined that might arise ...
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Absorption of Sulphur Dioxide with Sodium Hydroxide Solution in Packed Columns
1 Introduction "Die absorption of sulphur dioxide from effluent gases by using aqueous sodium hydroxide solution as a solvent has become established practice in industry where a high degree of purity of the effluent gases must be ensured in a reliable manner. Although it has long been known that it is basically possible to clean effluent gases containing sulphur dioxide effectively by using ...
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Valorisation of Posidonia oceanica leaf sheaths in removing synthetic dye from aqueous media using dynamic column system
Packed columns were prepared using Posidonia oceanica fibres as adsorbent for the removal of a direct dye, Congo red (CR), from aqueous solution. The effects of flow rate, concentration of CR, pH solution and bed depth on breakthrough curves were investigated. The experimental results showed that the breakthrough time decreased with the increase of flow rate, influent concentration and the ...
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Enrichment of oxygen-containing aromatics in an extract from Zhundong subbituminous coal
Zhundong subbituminous coal (ZSBC) was exhaustively extracted with isometric carbon disulfide (CDS)/acetone mixed solvent to afford extract 1 (E 1 ), which was sequentially extracted with petroleum ether (PE) and CDS to afford extracts 2 (E 2 ) and 3 (E 3 ). E 3 was gradiently eluted into effluent portions 1 to 5 (EPs 1 to 5) through a silica gel-packed column sequentially with PE, ...
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Immobilization of magnesium ammonium phosphate crystals within microchannels for efficient ammonia removal
Magnesium ammonium phosphate was formed in flow-through microchannels of silica monoliths using two different methods to fabricate materials that show efficient ammonia adsorption performance from wastewater with low hydraulic resistance. Magnesium ammonium phosphate crystals in these materials release ammonia when heated at 378 K, yielding primarily magnesium hydrogen phosphate. When this ...
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Modified crab shell particles for the removal of lead[II] ions from aqueous solutions
The ability of crab shell particles to remove lead[II] was evaluated in a batch reactor and in a fixed–bed column. The binding of lead[II] by crab shell was found to be affected significantly by pH, with maximum sorption capacity 714 mg/g observed at pH 4. The sorption isotherm of lead[II] on crab shell particles was modelled by the application of Langmuir followed by Sips, Redlich–Peterson and ...
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Biosorptive removal of malachite green from aqueous solution using chemically modified brown marine alga Sargassum swartzii
Sargassum swartzii, marine macro brown alga, showed a high malachite green (MG) biosorption capacity in batch mode of operation. The analytical evidence from Fourier transform infrared spectra confirmed the involvement of amine group in the biosorption of MG and electrostatic interaction type of mechanism was proposed to occur between the amine group of dye and the cationic MG dye ...
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NOx Scrubber System - Case study
Criterion Catalysts & Technology supplies refining and petrochemical catalysts for hydroprocessing applications, including tail gas treating, alkylation pretreatment, isomerization, hydrotreating and hydrocracking. Criterion’s facility in Azusa, CA installed a NOx scrubber system engineered and built by Tri-Mer. It has a 3000-cfm capacity at 250 lbs./hr. of NOx. This NOx scrubber has ...
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Modeling of breakthrough curves for aqueous iron (III) adsorption on chitosan-sodium tripolyphosphate
A fixed bed column packed with chitosan-sodium tripolyphosphate (CTPP) beads was used to remove aqueous Fe (III) ions. The adsorption of Fe (III) ions on CTPP beads was found to be dependent on operating conditions, such as the flow rate, adsorbent bed length, and feed concentration. The experimental data were assessed with Thomas, Adams-Bohart and Yoon-Nelson models to predict the ...
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Analyses of Permanent Gases, Light Hydrocarbons, and Light Polar Compounds, Using Packed Column GC
GC columns containing Carboxen-1000 packing separate mixtures of permanent gases (nitrogen, hydrogen, oxygen/argon, carbon monoxide, carbon dioxide) and C1-C3 light hydrocarbons (methane, acetylene, ethylene, ethane, propyne, propylene, and propane). A 15’ x 1/8” column will separate the permanent gases and C1 and C2 hydrocarbons in less than 25 minutes. A 2’ x 1/8” column ...
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Prediction of three–phase saturation profiles from two–phase capillary pressure curves as a function of wettability
Gravity drainage of oil with gas is an efficient recovery method in strongly water–wet reservoirs and yields very low residual oil saturations. However, many of the oil–producing reservoirs are not strongly water–wet. Thus, predicting the profiles and ultimate recovery for mixed and oil–wet media is essential to design and optimisation of improved recovery methods based on three–phase gravity ...
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