Talk:Seveso disaster

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Untitled

The article should go into the Category:Waste disposal incidents as the waste from the decontamination of the chemical plant vanished for a very long time. This missing waste and the hunt for it was a very important matter at the start of the 1980s. Cadmium

Removed some unrelated information Demantos 19:47, 23 August 2007 (UTC)[reply]

The introduction to the Chemical events section is confusing and weak. It makes sense that the 1,2,4,5-tetrachlorobenze has a chloro group replaced with a nucleophile such as the hydroxide mentioned forming the 2,4,5-trichlorophenol. It makes further sense that in building B where that chlorinated phenol would then be reacted with something such as chloroacetic acid to produce the final product. The mention that the chlorinated phenol was being used as an intermediate for a disinfectant does not seem to be consistent with a discussion of a plant making the 2,4,5, T without introducing the concept further. Even with that explained, it does not seem to add to the subsequent chemistry of how the production of the trichlorphenol resulted in an explosion. Vargob (talk) 22:39, 4 January 2009 (UTC)[reply]

You are so correct! I studied this accident as part of my thesis in '96, and the description here of what caused it is totally incorrect. My home thesis copy is temp mislaid, but I've one at work. I plan to properly describe (and cite the original publication) what chain (and it's several errors compounding) of events led to the disaster, tomorrow (6th Jan). The reaction is as you suggest, replace one Cl with an OH, all is well until it gets too hot, then two molecules of TCP combine and eliminate 2 mols of HCl (plus one TCDD). Ronhjones (talk) 01:31, 6 January 2009 (UTC)[reply]

Who wrote this? I read that the valve and the top of the chemical tank was blown off the top, releasing the chemicals. The valve failed, and exploded. The book i read, mistakes and disasters stated that the tank was badly designed, didn't have a dump tank for emergencies and the valve should have been at the bottom or something. —Preceding unsigned comment added by 193.195.15.6 (talk) 12:19, 19 December 2009 (UTC)[reply]

Dump tanks in 1976? Unlikely. Even thermal stability testing was in it's infancy then - I think the Accelerating, Rate Calorimeter only came out in about 1974-1975 - before that it was just DSC, and that would have only been in small non pressure crucibles. Where I worked we only started runaway testing in Feb 1979 (I still have the stamp in my old passport when we went to Switzerland for instruction). The main issue here is that they probably didn't know that heating >230C would make a massive thermal runaway (boiling point of 245-Trichlorophenol is very high), so designing for runaways would never happen. Ronhjones ^(Talk) 17:00, 20 December 2009 (UTC)[reply]

This page claims that the runaway temperature was reached because of the steam being a higher temperature than normal. Another explanation put forth to me was that during the quiescent period of the process a temperature gradient in the fluid emerged. The temperature of the higher temperature layer was then enough to start precursor reactions, which further raised the temperature and started the full-blown runaway reaction. ( T.G. Theofanous, "A Physicochemical Mechanism for the Ignition of the Seveso Accident," Nature 291 (5817) 640-642 (1981).) —Preceding unsigned comment added by 98.185.214.52 (talk) 01:23, 21 January 2010 (UTC)[reply]

There was language on this page (until today) suggesting that because a statistically significant increase in cancers in the affected population has not been found, it "could be argued" that it had not had a disastrous impact on the population. I believe it is common knowledge that high-level exposure to TCDD is disastrous regardless of what epidemiological studies have yet shown. I removed the language and I hope that doing so was appropriate. I found its presence pretty troubling in the first place. — Preceding unsigned comment added by Masonpew (talk • contribs) 03:50, 24 March 2016 (UTC)[reply]

I have heard it several times that dioxins/Agent Orange/diesel fumes have a long term effect on people 'causing' suicides. It's just a suggestion for research which I believe would be worthwhile. It is now long enough ago and people movements may not have been significant. 2001:8003:A921:6300:8059:B478:B030:24D9 (talk) 05:17, 19 September 2017 (UTC)[reply]

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Disaster

Hello 87.241.189.24 (talk) 12:57, 22 December 2022 (UTC)[reply]