Hysteresis in Sorption. III. Permanence and Scanning of the Hysteresis Loop. Silica Gel–Water System.

1941 ◽  
Vol 45 (3) ◽  
pp. 513-517 ◽  
Author(s):  
Kittur Subba Rao
Keyword(s):  
Hysteresis Loop ◽  
Silica Gel ◽  
Water System

HYSTERESIS IN SILICA GEL SORPTION SYSTEMS

1934 ◽  
Vol 10 (6) ◽  
pp. 713-729 ◽  
Author(s):  
L. M. Pidgeon
Keyword(s):  
Hysteresis Loop ◽  
Silica Gel ◽  
Sulphur Dioxide ◽  
Water System ◽  
The Other ◽  
Vapor Pressures ◽  
Large Pressure ◽  
Pressure Changes ◽  
Permanent Gases ◽  
Sorption Systems

The hysteresis which normally appears in the isotherms of the silica gel-water system has been attributed by Patrick to the presence of permanent gases in the system. Only one case has been found in which a reversible isotherm has been recorded in the silica gel-water system. For alcohol and benzene only one case of hysteresis has been reported. These results seem to be independent of the presence or absence of air or other gases.The sorption of water, benzene and ethyl alcohol has been examined using the sorption balance. A hysteresis loop appears for water only. This hysteresis may not be eliminated by special methods of evacuation and must be considered as a real effect. The isotherms of alcohol and benzene, on the other hand, are completely reversible. It has been shown that the dimensions of the hysteresis occurring in the water system may be affected by the manner of addition of vapor to the apparatus. Only when the vapor pressures remain reasonably constant during sorption are the dimensions of the effect evident. If very large pressure changes take place the hysteresis may disappear.A comparison of the isotherms for water showing hysteresis, and those of the sulphur dioxide system (upon which the original suggestion as to the cause of hysteresis was based) show that there is not necessarily any relation between the two.

A new generation cooling device employing CaCl2-in-silica gel–water system

2009 ◽  
Vol 52 (1-2) ◽  
pp. 516-524 ◽  
Author(s):  
Bidyut Baran Saha ◽  
Anutosh Chakraborty ◽  
Shigeru Koyama ◽  
Yu I. Aristov
Keyword(s):  
Silica Gel ◽  
Water System ◽  
Cooling Device ◽  
New Generation

Study of Waste Heat Driven Adsorption Cooling System Employing Doped MiL-101(Cr) and Water as Adsorbent Adsorbate Pair

2015 ◽  
Author(s):  
Anutosh Chakraborty ◽  
Syed Muztuza Ali ◽  
How Wei Benjamin Teo
Keyword(s):  
Silica Gel ◽  
Waste Heat ◽  
Cooling System ◽  
Water System ◽  
Cooling Capacity ◽  
Isotherm Models ◽  
Oh Groups ◽  
Adsorption Chiller ◽  
Adsorption Isotherm Models ◽  
Adsorption Cooling System

This article presents the dynamic behaviors of two bed adsorption chiller utilizing the composite adsorbent “immobilization of NH2, -NO2, -OH groups to MiL-101(Cr)” as adsorbent and water as adsorbate, which is based on the experimentally confirmed adsorption isotherms and kinetics data. The experimentally measured MOFs + water based isotherms and kinetics data are fitted with adsorption isotherm models and linear driving force kinetics equations. Compared with the experimental data of conventional adsorption chiller based on zeolites/silica gel-water system, we found that the newly working pair provides better cooling capacity and performances in terms of COP and adsorption bed size. From numerical simulation, it is also found that the cooling capacity can be increased up to 20 percent of the parent silica gel-water adsorption chiller and the COP can be improved up to 25% more at optimum conditions.

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