Application of transpiration theory to TGA data: Calcium carbonate and zinc chloride

Thermogravimetric analysis (TGA) data for vaporization of CO 2(g) from CaCO 3(s) and vaporization of ZnCl 2(l) are analyzed using theory from the transpiration method. Transpiration theory uses coupled diffusive and hydrodynamic flow. Temperature dependence of the TGA data yields reliable values for...

Full description

Saved in:
Bibliographic Details
Published in:Thermochimica acta 1995-02, Vol.250 (1), p.41-53
Main Authors: Oniyama, Emmanuel, Wahlbeck, P.G.
Format: Article
Language:English
Subjects:
Calcium carbonate
TGA
Transpiration
Zinc chloride
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Thermogravimetric analysis (TGA) data for vaporization of CO 2(g) from CaCO 3(s) and vaporization of ZnCl 2(l) are analyzed using theory from the transpiration method. Transpiration theory uses coupled diffusive and hydrodynamic flow. Temperature dependence of the TGA data yields reliable values for Δ vap H ⦵ . Analyses of the TGA data show that the viscosity coefficient has no significant effect. Fitting of experimental data at different flow rates of carrier gas yields the diffusion coefficient parameter and an experimental vaporization coefficient α vap. The experimental vaporization coefficient has contributions from a true vaporization coefficient and from desaturation associated with the apparatus design.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(94)01935-A