Quantitative determination of the bound water in Bazhenov shales

2019 ◽  
pp. 34-44
Author(s):  
I. A. Rodkina ◽  
E. S. Kazak
Keyword(s):  
Capillary Condensation ◽  
Bound Water ◽  
Sorption Isotherms ◽  
Important Conclusion ◽  
Bazhenov Formation ◽  
Different Types ◽  
First Results ◽  
Mineral Compositions ◽  
Water Sorption Isotherms

The article presents the first results of determining the content of different types of bound water by hygrometric method — adsorption isotherm method — for non-extracted air-dry samples of Bazhenov formation rocks. The obtained water sorption isotherms for the studied samples have a well-expressed s-shape, which allows to determine the maximum possible amount of bound water of different types in them — mono-, poly — and capillary condensation and to draw an important conclusion about the hydrophilicity of the Bazhenov formation deposits. According to the form of sorption isotherms, the amount of bound water and the proximity of mineral compositions, nine samples were combined into 4 different groups, the remaining samples were considered individually. A correlation between the pore water content and the content of mono- and multilayer water was found.

scholarly journals Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore

2016 ◽  
Vol 20 (5) ◽  
pp. 493-498 ◽  
Author(s):  
Kelly A. de Sousa ◽  
Osvaldo Resende ◽  
Bruno de S. Carvalho
Keyword(s):  
Moisture Content ◽  
Latent Heat ◽  
Equilibrium Moisture Content ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Static Method ◽  
The One ◽  
Content Range ◽  
Water Sorption Isotherms

ABSTRACT The objective was to determine water sorption isotherms of diaspores of pequi fruits in order to obtain information on the amount of water that this product desorbs at the temperatures of 10, 20, 30 and 40 °C and water activities from 0.20 to 0.89, adjusting different mathematical models to experimental data, and to determine its latent heat and isosteric heat. The equilibrium moisture content was obtained through the indirect static method, using the device Hygropalm Model Aw 1. The Modified Henderson model was the one that best fitted the data and was selected to predict the equilibrium moisture content of pequi diaspore. It was observed that the higher the temperature for the same equilibrium moisture content (% d.b.), the higher the water activity values. As temperature values increased, there was a reduction in the vaporization latent heat of the product. Isosteric heat values of diaspores of pequi fruits in the moisture content range of 4.02 to 16.63 (% d.b.) varied from 2,776.49 to 2,558.39 kJ kg-1.

scholarly journals NMR determination of sorption isotherms in earlywood and latewood of Douglas fir. Identification of bound water components related to their local environment

Holzforschung ◽  
2017 ◽  
Vol 71 (6) ◽  
pp. 481-490 ◽  
Author(s):  
Marie Bonnet ◽  
Denis Courtier-Murias ◽  
Paméla Faure ◽  
Stéphane Rodts ◽  
Sabine Care
Keyword(s):  
Relaxation Times ◽  
Bound Water ◽  
Sorption Isotherms ◽  
Local Environment ◽  
Douglas Fir ◽  
Adsorption Mechanisms ◽  
H Nmr ◽  
Nmr Relaxometry ◽  
Sorption Energy

Abstract Earlywood (EW) and latewood (LW) have different hygromechanical behaviors, if subjected to relative humidity (RH) variations. To understand this effect better, the adsorption mechanisms of EW and LW of Douglas fir were studied by 2D 1H NMR relaxometry under conditions of equilibrium moisture content (EMC) at 20°C. Two bound water components were detected with relaxation times T1 and T2 indicating that they are located in distinct environments but these are similar in EW and LW. Sorption isotherms were calculated and analyzed based on the sorption model of Dent. A difference of sorption energy between the two water components is in agreement with their mobility difference observed on T1−T2 correlation spectra. Moreover, for the two bound water components, EW and LW exhibit different sorption isotherms at high RH. This may be attributed to a difference of adsorption capacity. Based on the macrofibril models provided by the literature, the following hypothesis is proposed: bound water components are located in lamellar and lenticular areas, both leading to possible deformations.

scholarly journals Determination of the water sorption isotherms for cassava flour

2010 ◽  
Vol 1 (2) ◽  
pp. 83 ◽  
Author(s):  
Juliana Fermino Farias ◽  
Mirele Fernandes Ferreira ◽  
Wagner André dos Santos ◽  
Evandro Bona
Keyword(s):  
Water Sorption ◽  
Chemical Properties ◽  
Sorption Isotherms ◽  
Small Variation ◽  
Cassava Flour ◽  
Different Temperatures ◽  
Saline Solutions ◽  
Processing Steps ◽  
Water Sorption Isotherms

<p>Cassava is a nourishing food and widely consumed in Brazil in the form of flour. However, it is necessary a more detailed study of the physical-chemical properties of the cassava flour and thus optimize its processing steps such as drying. The objective of this work was to obtain the water sorption isotherms for the cassava flour at different temperatures. For this aim, experiments were carried out using the static method with saturated saline solutions at 30, 40, 60 and 70&deg;C. The data obtained were adjusted on available literature equations using the software MATLAB R2007b. The results indicate that the temperature ranging from 40 to 70&deg;C does not significantly influence the cassava flour equilibrium moisture. It was also found &nbsp;that both Halsey and Smith's isotherm can be used to predict the cassava flour equilibrium moisture. Furthermore, it was observed a small variation in the equilibrium moisture for water activity ranging from 0 to 0.8.</p><p>&nbsp;</p><p>DOI: http://dx.doi.org/10.14685/rebrapa.v1i2.21</p>

Modelling the Water Sorption Isotherms of Quinoa Seeds (Chenopodium quinoa Willd.) and Determination of Sorption Heats

2011 ◽  
Vol 5 (5) ◽  
pp. 1686-1693 ◽  
Author(s):  
Margarita Miranda ◽  
Antonio Vega-Gálvez ◽  
Mariela Sanders ◽  
Jéssica López ◽  
Roberto Lemus-Mondaca ◽  
...  
Keyword(s):  
Water Sorption ◽  
Chenopodium Quinoa ◽  
Sorption Isotherms ◽  
Water Sorption Isotherms

Determination of the Recent Tectonic Movements Using GPS and Insar Methods; The First Results From the Eastern Part of the Gediz Graben

2015 ◽  
Author(s):  
Fatih POYRAZ ◽  
Orhan TATAR ◽  
Kemal Özgür HASTAOĞLU ◽  
İbrahim TİRYAKİOĞLU ◽  
Önder GÜRSOY ◽  
...  
Keyword(s):  
First Results ◽  
Tectonic Movements
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