Degradation of MMEA at absorber and stripper conditions

Oxidative degradation of amines using a closed batch system

“…Most of the amines tested showed very little oxidative degradation and this makes it difficult to propose degradation mechanisms for the formation of new degradation compounds. In general it seems like the formation of degradation compounds follows the same patterns as earlier described for the formation of de-methylated amines (secondary and tertiary amines) or secondary products as HEF analogues, HEI, OZD analogues, alkylamines and ammonia (da Silva et al, 2012; Lepaumier et al, 2011b;Lepaumier et al, 2009b;Strazisar et al, 2003;.…”

“…System and methods used for LC-MS analysis (alkylamine, ammonia, degradation compounds, amine, full scan) are described in more details by da Silva and Vevelstad (da Silva et al, 2012;. Details for the alkylamine and ammonia analysis for MEA experiment 1, KSAR and KGly on GC-MS are described by Vevelstad , while more thorough details on method and system used for the GC-MS analysis (MEA, MMEA, DMMEA, KSAR) of degradation compounds are given by Lepaumier (Lepaumier et al, 2011b). All systems and methods used for the rest of analyses, except "HSS", were described in detail in previous publications .…”

“…Oxidation degradation of MMEA has also been conducted in an open batch setup (Lepaumier et al, 2011b) and in this case only 19 % of the MMEA was recovered after 311 hours. As comparison, more than 68 % of MMEA was recovered in the closed setup after 500 hours.…”

“…Percentage formation of the degradation products ( , f i  ) was calculated by the method described by Lepaumier (Lepaumier et al, 2011b) The time period between conducting the two MEA experiments was about 1 year. Small concentration changes for the degradation compounds in these experiments could therefore be explained by analytical procedures being under continuous development.…”

“…Increased attention on oxidative degradation was seen after pilot plant samples showed high degree of similarity to degradation compounds found in oxidative degradation experiments (da Silva et al, 2012;Lepaumier et al, 2011a;Strazisar et al, 2003). The oxidative degradation experiments reported have been performed in variations of two setups, either in a closed-batch reactor at elevated temperature and oxygen pressure (Lepaumier et al, 2009b;Supap et al, 2001;Wang and Jens, 2011) or in an open-batch reactor at 55 °C, where the solution would be sparged with a wet gas blend of CO2 and O2/air (da Silva et al, 2012;Goff and Rochelle, 2004;Lepaumier et al, 2011b;Sexton and Rochelle, 2011). Lately, also the temperature swing The present paper describes results from oxidative degradation experiments on five amines and two amino acids in a laboratory scale closed setup at atmospheric pressure.…”