Cryogenic pressure temperature swing adsorption process for natural gas upgrade

Optimization of Sibipiruna activated carbon preparation by simplex-centroid mixture design for simultaneous adsorption of rhodamine B and metformin.

The design of adsorption chillers is usually based on experience and high experimental effort Experimental effort can be reduced by using dynamic models In the present study, a dynamic model is validated with a modular adsorption chiller test bed and then used to optimize design and process parameters to gain maximum cooling power The modularity of the test bed enables the exchange of single components without changing the remaining setup This modular structure is also reflected in the object-oriented dynamic model Model calibration is based on the heat flows of all components This measure allows the gain of deep insight into the system behavior and a quantitative comparison of model accuracy The calibrated model is validated by predicting the system behavior for different operating conditions and also changed adsorbent materials Adsorbent materials silica gel 123 and zeolite 13X are investigated Operating points vary in cycle time, as well as temperatures of evaporation, adsorption, and desorpti

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Optimal design of adsorption chillers based on a validated dynamic object-oriented model

Effect of pore sizes on composition distribution and enhance recovery from liquid shale—Molecular sieving in low permeability reservoirs

Wood and coal, as low-cost sorbents, have been evaluated as an alternative to commercial granular activated carbon (GAC) for chlorophenol removal Kinetic experiments indicated that filter coal had a significantly lower rate of uptake (∼ 10% of final uptake was achieved after three hours) than the other sorbents, owing to intra-particle diffusion limitations The data fitted a pseudo-second-order model Sorption capacity data showed that GAC had a high sorption capacity (294–467 mg g−1) compared with other sorbents (32–75 mg g−1) However, wood and coal had a greater sorption capacity per unit surface area than GAC Sorption equilibrium data was best predicted using a Freundlich adsorption model The sorption capacity for all sorbents was 2-chlorophenol<4-chlorophenol<2, 4-dichlorophenol, which correlates well with solute hydrophobicity, although the relative differences were much less for coal than the other sorbents The results showed that pine, hardwood and filter coal can be used as sorbent materia

Sorption of chlorophenols from aqueous solution by granular activated carbon, filter coal, pine and hardwood.

1.

Two methods of precalculating the parameters of adsorption equilibrium within a broad range of pressures and temperatures according to the information contained in one adsorption isotherm have been proposed on the basis of an analysis of the experimental data on adsorption on microporous adsorbents.




2.

The first method, applicable in the region of comparatively large degrees of filling, is based upon the virtual linearity of the adsorption isosteres and the exponential dependence of the limiting adsorption in micropores upon the temperature, taken with the opposite sign.




3.

The second method, applicable in the region of not very significant degrees of filling, is based upon the assumption that the adsorption isosteres are practically linear all the way up to the so-called quasicritical temperature. A method is indicated for approximate estimation of the pressure and temperature for the quasicritical points on the basis of the empirical equations of state of the real gas.




4.

Both methods are confirmed experimentally with quite satisfactory accuracy. They also provide the possibility of calculating the differential heats and entropies of adsorption. In addition, they permit a calculation of the adsorption of gas at temperatures above the critical temperatures according to the adsorption isotherm of the vapor (for example, at the boiling point).

Adsorption in micropores

http://link.springer.com/content/pdf/10.1007/BF00906796.pdf

Adsorption in micropores: Communication 1. Theoretical concepts

1.

The adsorption properties of crystalline zeolites CaA and NaX with respect to vapors of various substances were studied in the region of relatively high degrees of filling.




2.

The limiting values of the adsorption of vapors of various substances correspond to volume filling of the zeolite cavities by molecules of the substances to be adsorbed.




3.

The molar volumes of maximally adsorbed substances are practically the same for CaA and NaX zeolites. Depending on the nature of the substances to be adsorbed, they may be close to or differ substantially from the molar volumes of normal liquids.




4.

A specific peculiarity of microporous adsorbents of different kinds in comparison with coarsepored adsorbents was demonstrated for the example of the adsorption of argon.

Investigation of the adsorption properties and secondary porous structure of adsorbents exhibiting molecular sieve action Communication 12. Specific peculiarities of microporous adsorbents in the adsorption of vapors of various substances

1.

Granulated Type A zeolites prepared by Soviet investigators are identical with corresponding American samples in adsorptivity, both when the adsorbed molecules are able to penetrate the porous structure of the actual zeolite crystals, and when larger molecules are adsorbed only on the surface of the secondary pores of the granules.




2.

The zeolite granules studied are substantially different in the volume of secondary porous structures which they possess, which is the principal cause of the difference between the apparent and gravimetric densities of the granulated zeolites, and, in the final reckoning, for their adsorptivities per unit volume of granule layer.




3.

The limiting adsorbed volumes, the apparent granule densities, and the gravimetric densities of granule layers, may be calculated from the composition of the granules and the properties of their components.

Study of the adsorptional properties and secondary porous structure of adsorbents with a molecular sieve action

1.

The adsorption properties of granulated industrial samples of Linde molecular sieves 4A and 5A with respect to the vapors of substances whose molecules penetrate through the windows into the elementary spaces of the zeolite crystals are described satisfactorily by the potential theory of adsorption.




2.

The secondary porous structure of the granules, which is formed by gaps and spaces between touching zeolite crystals, could be described quantitatively by sorption and mercury porosimetric methods.

E. G. Zhukovskaya

Papers

Adsorption in micropores

Adsorption in micropores: Communication 1. Theoretical concepts

Investigation of the adsorption properties and secondary porous structure of adsorbents exhibiting molecular sieve action Communication 12. Specific peculiarities of microporous adsorbents in the adsorption of vapors of various substances

Study of the adsorptional properties and secondary porous structure of adsorbents with a molecular sieve action

Adsorption properties and secondary porous structure of adsorbents with a molecular sieve action