The closure of Grangemouth oil refinery in Scotland is "not comparable" to the situation at British Steel in Scunthorpe, MPs have been told.
Business Secretary Jonathan Reynolds said an emergency law aimed at saving the Lincolnshire site from closure was an "exceptional situation".
SNP Westminster leader Stephen Flynn challenged Reynolds over similarities to the closure of the Scottish refinery on the Firth of Forth - with the loss of 400 jobs.
It came during a rare Saturday sitting of parliament to pass legislation to save the the British Steel plant, opening the door for full nationalisation.