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Title: The Component Slope Linear Model for Calculating Intensive Partial Molar Properties: Application to Waste Glasses

Abstract

Partial molar properties are the changes occurring when the fraction of one component is varied while the fractions of all other component mole fractions change proportionally. They have many practical and theoretical applications in chemical thermodynamics. Partial molar properties of chemical mixtures are difficult to measure because the component mole fractions must sum to one, so a change in fraction of one component must be offset with a change in one or more other components. Given that more than one component fraction is changing at a time, it is difficult to assign a change in measured response to a change in a single component. In this study, the Component Slope Linear Model (CSLM), a model previously published in the statistics literature, is shown to have coefficients that correspond to the intensive partial molar properties. If a measured property is plotted against the mole fraction of a component while keeping the proportions of all other components constant, the slope at any given point on a graph of this curve is the partial molar property for that constituent. Actually plotting this graph has been used to determine partial molar properties for many years. The CSLM directly includes this slope in a modelmore » that predicts properties as a function of the component mole fractions. This model is demonstrated by applying it to the constant pressure heat capacity data from the NaOH-NaAl(OH{sub 4}H{sub 2}O system, a system that simplifies Hanford nuclear waste. The partial molar properties of H{sub 2}O, NaOH, and NaAl(OH){sub 4} are determined. The equivalence of the CSLM and the graphical method is verified by comparing results detennined by the two methods. The CSLM model has been previously used to predict the liquidus temperature of spinel crystals precipitated from Hanford waste glass. Those model coefficients are re-interpreted here as the partial molar spinel liquidus temperature of the glass components.« less

Authors:
 [1]
  1. Washington River Protection Solutions, Richland, WA (United States)
Publication Date:
Research Org.:
Hanford Site (HNF), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Environmental Management (EM) (United States)
OSTI Identifier:
1079929
Report Number(s):
WRPS-54382-FP Rev 0
TRN: US1300153
DOE Contract Number:  
DE-AC27-08RV14800
Resource Type:
Conference
Resource Relation:
Conference: WM2013 Waste Management Symposia, Phoenix, AZ (United States), 24-28 Feb 2013
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES

Citation Formats

Reynolds, Jacob G. The Component Slope Linear Model for Calculating Intensive Partial Molar Properties: Application to Waste Glasses. United States: N. p., 2013. Web.
Reynolds, Jacob G. The Component Slope Linear Model for Calculating Intensive Partial Molar Properties: Application to Waste Glasses. United States.
Reynolds, Jacob G. 2013. "The Component Slope Linear Model for Calculating Intensive Partial Molar Properties: Application to Waste Glasses". United States. https://www.osti.gov/servlets/purl/1079929.
@article{osti_1079929,
title = {The Component Slope Linear Model for Calculating Intensive Partial Molar Properties: Application to Waste Glasses},
author = {Reynolds, Jacob G.},
abstractNote = {Partial molar properties are the changes occurring when the fraction of one component is varied while the fractions of all other component mole fractions change proportionally. They have many practical and theoretical applications in chemical thermodynamics. Partial molar properties of chemical mixtures are difficult to measure because the component mole fractions must sum to one, so a change in fraction of one component must be offset with a change in one or more other components. Given that more than one component fraction is changing at a time, it is difficult to assign a change in measured response to a change in a single component. In this study, the Component Slope Linear Model (CSLM), a model previously published in the statistics literature, is shown to have coefficients that correspond to the intensive partial molar properties. If a measured property is plotted against the mole fraction of a component while keeping the proportions of all other components constant, the slope at any given point on a graph of this curve is the partial molar property for that constituent. Actually plotting this graph has been used to determine partial molar properties for many years. The CSLM directly includes this slope in a model that predicts properties as a function of the component mole fractions. This model is demonstrated by applying it to the constant pressure heat capacity data from the NaOH-NaAl(OH{sub 4}H{sub 2}O system, a system that simplifies Hanford nuclear waste. The partial molar properties of H{sub 2}O, NaOH, and NaAl(OH){sub 4} are determined. The equivalence of the CSLM and the graphical method is verified by comparing results detennined by the two methods. The CSLM model has been previously used to predict the liquidus temperature of spinel crystals precipitated from Hanford waste glass. Those model coefficients are re-interpreted here as the partial molar spinel liquidus temperature of the glass components.},
doi = {},
url = {https://www.osti.gov/biblio/1079929}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 11 00:00:00 EST 2013},
month = {Fri Jan 11 00:00:00 EST 2013}
}

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