11. Propene has a higher density and boiling point than ethylene due to its greater mass.12. Propene has low acute toxicity from inhalation.13. It is obtained industrially as a byproduct in the production of isopropanol by hydration of propene . 14. Isobutyraldehyde is manufactured, often as a side-product, by the hydroformylation of propene . 15. HD-5 is a specification that establishes a maximum concentration of 5 % propene in propane. 16. Cyclopropane and propene have the same molecular formula but have different structures, making them structural isomers. 17. Early measurements indicated that at least four gases leaked were methane, propene , ethylene and butane. 18. The concentration of the propene at the explosion site was abnormally high at 13, 000 ppm. 19. As a result, propene tends to be the only product, unless local demand exists for hydrogen. 20. The conversion rate of propene is 98 % and the selectivity to the n-butanal is high.
