Activated carbon fiber: Fundamentals and applications

Physical adsorption of gases at high pressure. IV. An improvement of the Dubinin—Astakhov adsorption equation

Affinity coefficients of the Polanyi/Dubinin adsorption isotherm equations: A review with compilations and correlations

Knudsen diffusion in microporous carbon membranes with molecular sieving character

(1985). Micelles in Separations: Practical and Theoretical Review. Separation and Purification Methods: Vol. 14, No. 2, pp. 213-304.

Micelles in Separations: Practical and Theoretical Review

Adsorption equilibria of various gases and vapors on molecular-sieving carbon were measured. The data were correlated by the Dubinin-Astakhov equation: W=W0 exp [-(A/E0)n], and the characteristic values of adsorption were determined. The equation covers the adsorption of various kinds of gases and vapors. The exponent n in the equation is about 3 for organic gases and lies between 2 and 3 for inorganic gases. The charactersitic energy of adsorption is expressed as E=β(ΔH0)s, where (ΔH0)s is the standard heat of vaporization of a standard material such as benzene and the coefficient β is approximately equal to the ratio of the parachor of the adsorbate to that of the standard material. Studies are made of three different types of deviations from the Dubinin-Astakhov equation, observed in the course of experiment.

Correlation of adsorption equilibrium data of various gases and vapors on molecular-sieving carbon

Adsorption Equilibrium on Molecular-sieving Carbon

Adsorption of poly(oxyethylene) of nine different molecular weights ranging from 194 to 2.49×106 from aqueous solution of 100 mg/l on activated carbons was tried in a batch finite bath. Activated carbon of coconut shell base, which has micropores of 8 A radius, and of lignite base activated carbon showed a reasonable capacity of adsorption of even poly(oxyethylene) of molecular weight bigger than 104 which has Flory''s dimension of 84 A radius. This suggests that shrinkage of a polymer molecule occurs when it is adsorbed on the carbon surface. As for the rate of adsorption, surface diffusion possibly caused by migration of monomer units is considered dominant, and the effective surface diffusion coefficient was determined for each system by applying the concentration diagrams previously presented by the authors. The effective surface diffusion coefficient on each carbon decreased in proportion to the square root of molecular weight of the polymer.

/pdf/adsorption-of-poly-oxyethylene-of-various-molecular-weights-338vxyp264.pdf

Adsorption of poly(oxyethylene) of various molecular weights from aqueous solutions on activated carbon

4工程から成る圧力スイングサイクルによる希薄成分の吸着濃縮について理論的および実験的研究を行ない, 次の結論を得た。1) 直線平衡系については, 吸着, 減圧およびパージの各工程における流出濃度および塔内の濃度前線の移動が理論的に求められる。2) 減圧工程において平衡脱着の仮定の下で導いた理論解は実験値とよく一致する。なお具体例として核燃料再処理排ガス中の放射性クリプトンの濃縮除去に理論および実験結果を適用し, 圧力スイングサイクル吸着装置の設計に必要な諸元の計算方法を提出し, 計算例を示した。

https://www.jstage.jst.go.jp/article/kakoronbunshu1953/37/3/37_3_288/_pdf

Concentration of Dilute Gases by Pres sure-Swing Adsorption

活性炭固定層におけるN2ガス中の83Krの吸脱著破過曲線をRe=30-0.1の範囲で測定した。測定結果に粒内および境膜の物質移動係数並びに軸方向混合拡散係紋の三つの因子を考慮した近似的な理論解を適用して, 軸方向のベクレ数を求めた。得られた数値は, 単純な混合のみが存在する充填層内の軸方向混合に関する既往のデータとほぼ一致した。これにより軸方向混合が無視できない場合の直線平衡系吸着破過特性の推算法が得られた。

Toshinaga Kawai

Papers

Correlation of adsorption equilibrium data of various gases and vapors on molecular-sieving carbon

Adsorption Equilibrium on Molecular-sieving Carbon

Adsorption of poly(oxyethylene) of various molecular weights from aqueous solutions on activated carbon

Concentration of Dilute Gases by Pres sure-Swing Adsorption

Axial Dispersion in Packed Bed Wherein Mass Tra nsfer between Fluid and Particle Exists