UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Reaction and transport kinetics for depolymerization within a porous body

Krug, S; Evans, JRG; Ter Maat, JHH; (2002) Reaction and transport kinetics for depolymerization within a porous body. AIChE Journal , 48 (7) pp. 1533-1541. 10.1002/aic.690480716.

Full text not available from this repository.

Abstract

Polyoxymethylene is used as the organic vehicle for ceramic and metal powder injection moulding. It is ideal for studies of shrinking-core reaction kinetics in porous systems because it decomposes exclusively to monomer in the solid state in the presence of nitric acid vapor. The solid-gas reaction interface can be defined to within 3 μm by electron microscopy and about 50 μm optically. Reaction rates were measured in crowded powder assemblies containing 56 vol % alumina powder by observation of the boundary; a method that avoids the ambiguities of gravimetry. The reaction-rate constant and the effective diffusion coefficient of gas in the porous reacted layer were calculated from the shrinking core kinetics. The diffusion coefficient was in good agreement with theoretical estimates involving counterdiffusion. The time for complete depolymerization of a moulding was estimated for different powder characteristics, geometries, and volume fractions.

Type: Article
Title: Reaction and transport kinetics for depolymerization within a porous body
DOI: 10.1002/aic.690480716
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/144185
Downloads since deposit
0Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item