Comparative analysis of the methods for SADT determination

Area of Science:

• Chemical Engineering
• Materials Science
• Safety Engineering

Background:

• The self-accelerating decomposition temperature (SADT) is a critical parameter for the thermal safety of self-reactive substances during transport.
• Existing methodologies for SADT determination have limitations and inconsistencies that require further investigation.

Purpose of the Study:

• To critically evaluate the four methods recommended by the UN for SADT determination.
• To address the inconsistency between different SADT definitions and its impact on safety.
• To explore advanced methods for SADT determination in complex scenarios.

Main Methods:

• Survey of UN "Recommendations on the Transport of Dangerous Goods" (TDG) methods.
• Analysis of SADT definition inconsistencies.
• Evaluation of the Dewar test for solids with scale-up considerations.
• Proposal of a kinetics-based simulation method for complex cases.

Main Results:

• Identified limitations and inconsistencies in UN TDG methods for SADT determination.
• Demonstrated how differing SADT definitions can lead to unsafe transport conditions.
• Showcased the restricted applicability of the Dewar test for solids and proposed an improved approach.
• Validated the utility of kinetics-based simulation for complex packaging arrangements.

Conclusions:

• There is a need for refined SADT determination methods to ensure transport safety.
• Inconsistencies in SADT definitions pose significant risks that must be mitigated.
• Advanced techniques, including kinetics-based simulation, offer more reliable solutions for complex transport safety evaluations.