Four samples of pipeline wax from a North Sea crude oil pipeline have been examined in a microcalorimeter across a range of temperatures. The samples, which weighed a little under a gram, gave heat-release rates up to about 20 μW, and the initial temperature history is such that there is a small amount of melting which is manifest as a negative microcalorimeter signal. Esti mated activation energies for the oxidation are of the expected order of magni tude, though a little low.
Get full access to this article
View all access options for this article.
References
1.
Perry, R.H. and Green, D.Chemical Engineers' Handbook, Sixth Edition, New York: McGraw-Hill, 1984.
2.
"Self-heating test for carbon," IMCO, 1974-75.
3.
"Brown coals and lignites—testing of self-ignition," Draft proposal, ISO, 1994.
