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Published on 20/10/23
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An exothermic reaction occurred in a trichlorophenol (TCP) reactor after a batch process for production of chemical intermediates used in herbicide and disinfectant manufacture was halted for the weekend. The process involved reacting tetachlorbenzene with sodium hydroxide in an ethylene-glycol solvent followed by distillation to remove the solvent. The reactor overheated and the pressure rose until a bursting disc ruptured discharging its contents to atmosphere. A thick cloud containing a small but significant quantity of the ultra-toxic compound drifted slowly over neighbouring communities affecting people and animals.
Ask yourself and your crew:
- How can something like this happen here (e.g. on our site)?
- What safety measures (i.e. procedures, controls/barriers) do we have in place to mitigate the risk?
- How do we know the risk controls/barriers are working?
- What improvements or changes should we make to the procedures, controls/barriers or the way we work?
Original content courtesy of IChemE Safety Centre
