The problem of diethanolamine (DEA) degradation in gas‐treating processes was quantified through a detailed kinetic study. This reaction was found to be catalyzed by CO2, and degradation occurs in a successive manner to 3‐(2‐hydroxyethyl)oxazolidone‐2, to N,N,N′‐tris(2‐hydroxyethyl)ethylenediamine and then to N,N′‐bis(2‐hydroxyethyl)piperazine. A reaction mechanism consistent with these observations was proposed and tested through kinetic analyses. A satisfactory kinetic model which can be of practical use was derived.
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Kim et al. (1984) studied this question.