JDI_eng
Chemical
- Dec 13, 2023
- 3
Hello,
I am investigating decomposition relief scenarios and need to learn more about low-phi factor testing (i.e. VSP2) and high-phi factor testing (i.e. ARC). I understand that ARC tests can establish kinetics and develop kinetic models for decomposition relief. However, I recently learned that low-phi tests can induce different, secondary decomposition reactions compared to high-phi tests. Conceptually, this is sensible due to the difference in heat transfer conditions. In my case, the chemicals of interest do not have intuitive decomposition pathways (i.e. not like H2O2 decomp.)
Can anyone provide additional information/resources/personal experiences on this topic? Has anyone encountered situations where their ARC data drastically differs from their VSP2 data - perhaps showing different decompositions? Are these secondary decompositions unique to complex decompositions? If VSP2 is more representative of scale-up conditions due to its adiabatic nature, why use ARC testing in the first place? Perhaps ARC is better suited for less complex decompositions.
In the context of emergency relief systems (ERS) sizing, it is crucial to understand the kinetics of these scenarios and properly size the ERS. Moreover, from a legal perspective, it is required by OSHA PSM (see 1910.119(d)(1)(iv)) that "Process Safety Information (PSI) shall consist of reactivity data." Recent CSB findings for the Optima Belle decomposition catastrophe and reactive relief experts (i.e. ioMosaic) further reinforce this requirement. Therefore, I feel obligated to ensure that the right test is chosen to accurately depict these scenarios.
Thank you very much,
JDI
I am investigating decomposition relief scenarios and need to learn more about low-phi factor testing (i.e. VSP2) and high-phi factor testing (i.e. ARC). I understand that ARC tests can establish kinetics and develop kinetic models for decomposition relief. However, I recently learned that low-phi tests can induce different, secondary decomposition reactions compared to high-phi tests. Conceptually, this is sensible due to the difference in heat transfer conditions. In my case, the chemicals of interest do not have intuitive decomposition pathways (i.e. not like H2O2 decomp.)
Can anyone provide additional information/resources/personal experiences on this topic? Has anyone encountered situations where their ARC data drastically differs from their VSP2 data - perhaps showing different decompositions? Are these secondary decompositions unique to complex decompositions? If VSP2 is more representative of scale-up conditions due to its adiabatic nature, why use ARC testing in the first place? Perhaps ARC is better suited for less complex decompositions.
In the context of emergency relief systems (ERS) sizing, it is crucial to understand the kinetics of these scenarios and properly size the ERS. Moreover, from a legal perspective, it is required by OSHA PSM (see 1910.119(d)(1)(iv)) that "Process Safety Information (PSI) shall consist of reactivity data." Recent CSB findings for the Optima Belle decomposition catastrophe and reactive relief experts (i.e. ioMosaic) further reinforce this requirement. Therefore, I feel obligated to ensure that the right test is chosen to accurately depict these scenarios.
Thank you very much,
JDI
