Study of Adsorption Characteristics on Active Carbon for Ventilation Air Methane Separation

2011 ◽  
Vol 391-392 ◽  
pp. 1253-1258 ◽  
Author(s):  
Xiong Yang ◽  
Ying Shu Liu ◽  
Yong Ling Li
Keyword(s):  
Adsorption Isotherm ◽  
Active Carbon ◽  
Methane Concentration ◽  
Selective Adsorption ◽  
Operating Pressure ◽  
Active Carbons ◽  
Selectivity Factor ◽  
Adsorption Characteristics ◽  
Selection Parameter ◽  
Selection Parameters

Nine types of active carbon’s adsorption isotherm of nitrogen and methane at 298K, 308K and 318K were measured, and their selectivity factor and PSA sorption selection parameters were calculated. The results show the nine active carbons have desirable selective adsorption characters on methane to nitrogen. AC3 has the highest selectivity factor. It reaches to 5.11 at 298K. And AC3 is the optimal adsorbent in 9 different adsorbents. Its PSA sorption selection parameter is higher than others with the methane concentration of 0.2% at the operating pressure between 50kPa to 150kPa abs. In above conditions the higher the selectivity factor is, the higher the PSA sorption selection parameter will be.

Floating Separation between Collophanite and Dolomite Affected by Inorganic Interaction

2014 ◽  
Vol 881-883 ◽  
pp. 1665-1669
Author(s):  
Xiao Tai He ◽  
Qin Zhang ◽  
Shu Hao Qin
Keyword(s):  
Aqueous Solution ◽  
Surface Properties ◽  
Theoretical Basis ◽  
Selective Adsorption ◽  
Electric Properties ◽  
Mineral Surface ◽  
Negative Effects ◽  
Adsorption Characteristics ◽  
Research Findings ◽  
Dissolved Components

According to the type of Guizhou marine sedimentary phosphorus ore, the main reason of refractory is the similar surface properties of collophane and dolomite.In addition,the interaction of dissolved components of mineral and external ion leads the new eguilibrium system in aqueous solution,which further affects the selective adsorption of the agent in mineral surface.Selecting collophanite-dolomite system as the research object, this article studies the effect of the interaction of some inorganic anions on the floatability difference of the two minerals in the flotation system. The effect of the interaction on the electric properties of the mineral surface and adsorption characteristics were also examined with the purpose to find out the interaction mechanism.It hopes to provide theoretical basis for practical mineral selection. The research findings shows that in the range of pH 3 to 5, the interaction of PO43- and SO42- has a better effect of the separation between collophanite and dolomite.The interactions of SiO32- and CO32- makes the floatability difference of collophanite and dolomite closer when the pH is greater than 9.25, and simultaneously shows some negative effects on the flotation separation of the two minerals.

scholarly journals Removal of Heavy Metals (Fe, Mn and Cd) from Aqueous Solutions by Natural Zeolite and FeS Media

2021 ◽  
Vol 43 (7) ◽  
pp. 524-536
Author(s):  
Sung-kyu Choi ◽  
Min-jun Kim ◽  
Tae-geon Kim ◽  
Tae-jin Lee
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Molecular Diffusion ◽  
Kinetic Characteristic ◽  
Absorption Capacity ◽  
Langmuir Adsorption Isotherm ◽  
Limiting Factor ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics

Objectives : The adsorption characteristics of Fe, Cd, and Mn in aqueous solution using zeolite and FeS media were investigated by the adsorption isotherm and kinetic model analysis.Methods : The adsorption characteristics of the heavy metals (Fe, Mn, Cd) were investigated using Langmuir or Freundlich adsorption isotherm. The analysis of pseudo-first or pseudo-second order reaction was also attempted to evaluate the rate limiting factor such as molecular diffusion or chemical adsorption on the absorbents.Results and discussion : The adsorption of the heavy metals on the zeolite and FeS media was more suitable for the Langmuir adsorption isotherm, representing that mono-layer absorption on the surface and no interaction between the absorbed solutes. The order of adsorption preference to zeolite was Fe > Cd > Mn, whereas the order of adsorption preference to FeS media was Cd > Fe > Mn. The adsorption kinetics of zeolite and FeS media were more suitable for pseudo-secondary reactions than for pseudo-primary reaction.Conclusions : The absorption capacity of FeS media for the heavy metals (Fe, Cd and Mn) in aqueous solution was higher than that of zeolite. The adsorption pattern was suitable for the Langmuir adsorption isotherm, and has kinetic characteristic by chemisorption.

scholarly journals Improvement of Methane Storage Capacity for Active Carbons

1987 ◽  
Vol 4 (4) ◽  
pp. 217-223 ◽  
Author(s):  
Bronislaw Buczek ◽  
Leszek Czepirski
Keyword(s):  
Active Carbon ◽  
Storage Capacity ◽  
Methane Storage ◽  
Active Carbons ◽  
Spouted Bed ◽  
Commercial Carbon ◽  
Adsorptive Properties

A method for increasing storage capacity by working of the commercial active carbons in a spouted bed is proposed. By abrasion of external layers of grain active carbons with better adsorptive properties, smaller voids of bed and improved attrition strength was obtained. Investigations of methane storage capacity for active carbon NORIT R2 with different degrees of external layers removed, were carried out. Experiments indicate that methane storage capacity can be increased up to 15–20% over commercial carbon.

Co-Producing Active Carbons and Sodium Silicate from Pyrolyzed Rice Husk by CO2 Activation Coupled with NaOH Solution Boiling

2014 ◽  
Vol 595 ◽  
pp. 30-35
Author(s):  
Da Wei Li ◽  
Xi Feng Zhu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Sodium Silicate ◽  
Specific Surface Area ◽  
Rice Husk ◽  
Active Carbon ◽  
Desirability Function ◽  
Active Carbons ◽  
Solid Ratio ◽  
Naoh Solution

Active carbon and sodium silicate were produced simultaneously from pyrolyzed rice husk (PRH) by CO2 activation coupled with NaOH solution boiling. Doehlert matrix and Derringer's desirability function were applied to optimizing the boiling conditions to achieve a large specific surface area, a high silica extraction and low alkali consumption. In terms of this purpose, the optimum condition was determined as boiling CO2-activated char with 1mol/L NaOH solution at a liquid/solid ratio of 9.7 mL/g. Under this condition, the modulus of the sodium silicate and the specific surface area (SSA) of the active carbon were 2.62 and 897 m2/g, respectively. The values both reached their respective commercial levels. The pretreatment of the PRH with CO2 activation can markedly increase the SSA of active carbons.

STRESSES AND STRAINS IN ADSORBENT–ADSORBATE SYSTEMS. II

1957 ◽  
Vol 35 (1) ◽  
pp. 50-62 ◽  
Author(s):  
E. A. Flood
Keyword(s):  
Adsorption Isotherm ◽  
Pore Structure ◽  
Active Carbon ◽  
Structure Factor ◽  
Correlation Factor ◽  
Mean Stress ◽  
Semiempirical Equation ◽  
Strong Adsorption ◽  
Porous Adsorbent ◽  
Thin Walled

It has been shown previously that when adsorbates act as single component complexes, i.e. behave as single substances in complex force fields, volumetric mean adsorbate and mean adsorbent stress intensities can be calculated from adsorption isotherm data. When potentials of surface regions in the micropore system of a porous adsorbent are statistically independent of pore structure, linear mean stress intensities of the solid are related to volumetric means through an equation containing a structure factor which is independent of the nature and pressure of the adsorbed gas.In this paper we present adsorption extension data for an active carbon rod when exposed to helium, hydrogen, nitrogen, argon, krypton, and water at pressures up to 1600 p.s.i. The data suggest that the potentials of the capillary regions are not independent of structure. An empirical correlation factor is introduced and the resulting semiempirical equation describes the data probably within the experimental error.The results suggest that in cases of moderately strong adsorption, adsorption potentials of thick-walled capillary regions are higher than those of thin-walled regions.

scholarly journals Adsorption Properties and Structure of Some Active Carbons

1993 ◽  
Vol 10 (1-4) ◽  
pp. 211-220 ◽  
Author(s):  
I.A. Bardina ◽  
E.V. Kalashnikova ◽  
N.V. Kovaleva ◽  
T.A. Rudnitskaya ◽  
N.K. Shonya
Keyword(s):  
Gas Chromatography ◽  
Carbon Black ◽  
Active Carbon ◽  
Graphitized Carbon Black ◽  
Adsorption Properties ◽  
Static Method ◽  
Active Carbons ◽  
Heats Of Adsorption ◽  
Graphitized Carbon ◽  
Low Coverage

Gas chromatography has been used to determine the initial low-coverage heats of adsorption of C2–C6 hydrocarbons and their derivatives on active carbon and graphitized carbon black. The porous structure of the active carbon has been determined from the adsorption isotherms of benzene measured at 25°C by a vacuum static method. The isotherms have been analyzed with the help of the BET and Dubinin–Radushkevich theories.

Carbon catalyzed organic reactions: carbon promoted solvolysis of a phosphate ester derived from 1,1′-bi-2-naphthol

1980 ◽  
Vol 58 (2) ◽  
pp. 134-137 ◽  
Author(s):  
Yumiko Y. Hoyano ◽  
Richard E. Pincock
Keyword(s):  
Heterogeneous Catalysis ◽  
Functional Groups ◽  
Active Carbon ◽  
Optically Active ◽  
Organic Reactions ◽  
Phosphate Ester ◽  
Active Carbons ◽  
Carbon Blacks ◽  
Derivatives Of ◽  
Methyl Phosphate

Active carbons which catalyze the racemization of 1,1′-binaphthyl are not effective in racemizing the 2,2′-dihydroxyl and the 8,8′-dicarbomethoxyl derivatives of binaphthyl. The 2,2′-binaphthyl methyl phosphate ester derived from optically active 1,1′-bi-2-naphthol undergoes slow thermal racemization at 190 °C (t1/2 100 min, ▵H≠ 26.1 kcal/mol, ▵S≠ −21 cal/mol deg) in triglyme and this racemization rate is also unaffected by active carbon. However, in the hydroxylic solvent 2-(2-ethoxyethoxy)ethanol at 130 °C the rate of solvolysis of the phosphate ester is increased ca. tenfold by carbon blacks or decolorizing carbon at 1 mg/mL concentration. Control experiments show that the acceleration is not due to soluble impurities released by the carbons; heterogeneous catalysis, probably by acidic and/or nucleophilic functional groups on the carbon surfaces, is involved.

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