The thermal decomposition of propionic acid

The rate of thermal decomposition of propionic acid between 496 and 580°C is independent of surface-to-volume ratio in carbon-coated vessels. A second-order decomposition to methylketen and water predominates, but a first-order reaction producing carbon dioxide, ethane, and ethylene also occurs. The respective Arrhenius equations are k= 108·76 exp (–35,150/RT) l. mole–1 sec.–1, and k= 109·78 exp (–49,300/RT) sec.–1. Further decomposition of methylketen gives carbon monoxide, carbon dioxide, and hydrocarbon products.