Résumé 

DALMATIEN (Degradation of Amines in Liquid Matrix and Analysis: Toxicity or Innocuousness for ENvironment?) is an industrial research project dedicated to post-combustion. The goal of this project is to list all the degradation products of amines used in CO2 capture, to understand their formation and to study their toxicity.

 

CO2 capture must have the lowest environmental impact possible to be used industrially. But amines used in CO2 capture processes are known to react with O2, CO2, NOx and SOx to form degradation products which can be discharged into the atmosphere with treated flue gas. These products are not all known and are potentially dangerous to humans and environment.

 

This project is based on 4 tasks.

 

In the first task, laboratory conditions will be established in order to represent industrial scale conditions and degradation will be studied: degradation products identification and mechanisms proposal. MEA and piperazine will be studied because they are benchmark molecules. MEA is used in EconamineTM process (Fluor) and HiCapt+TM process (IFPEN). Piperazine is used in the process proposed by the team of G.T. Rochelle of the University of Texas and is an excellent activator for tertiary and sterically hindered amines.

 

In the second task, sampling and analysis methods will be created in order to identify and quantify degradation products in gas and liquid phase.

Analyses will be carried out on gas and liquid effluents from a pilot plant in order to determine the impact of operating conditions (flue gas temperature, CO2 partial pressure, washing section design).

This identification is also necessary in order to understand the degradation mechanisms and the definition of reactions pathways.

 

A third task will be the validation of experimental procedures by considering results obtained in the lab and pilot set-ups operated by the different partners. Analyses of gas and liquid phases will be carried out with the sampling and analysis method elaborated in Task 2 and compared.

 

Finally, a fourth task will consist in toxicology studies to be carried out on the different identified degradation products. These studies will be based on existing literature. For the compounds without any published data, a Quantitative Structure-Activity Relationship will be used to estimate a supposed toxicology. The study will take into account the impact on Human Health in order to highlight the critical compounds. This project will be used to develop countermeasures to avoid emissions or limit their impact.

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