(198g) Deflagration Incident in an Organic Peroxide Solution Tank
AIChE Spring Meeting and Global Congress on Process Safety
2018
2018 Spring Meeting and 14th Global Congress on Process Safety
Global Congress on Process Safety
Case Histories and Lessons Learned - GCPS Joint Session
Wednesday, April 25, 2018 - 4:15pm to 4:45pm
A VSP2 apparatus was used to generate material for sampling. A mild exotherm and pressure rise was observed when the hydroperoxide was added, with a net pressure increase of 49.2 psi. Based on the test cell vapor space volume of 40 ml, it is estimated approximately 0.0054734 moles of non-condensable gas was generated during the experiment. The oxygen concentration of the gas generated by decomposition is 93.68 vol% oxygen. The minimum ignition energy of the vapor was measured in accordance with ASTM E582, Standard Test Method for Minimum Ignition Energy and Quenching Distance in Gaseous Mixtures. The testing result was a measurement of 0.015 mj.
A charged water slug mechanism was investigated as a possible ignition source for Ashlandâs mixing tank explosion. The mechanism was initially thought to be implausible since the upset condition. While ignition via a spark from a single water slug is unlikely, the rinsing operation would have generated a large number of successive slugs each of which would have some likelihood of producing a static discharge. Each discharge would encounter a different gas composition and so itâs quite possible that the worst case gas composition would have been encountered by at least one slug.
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