On nonequilibrium of pyrolysis process in the manufacture of ethene

Nonequilibrium process for cracking ethane and n-buthane in the manufacture of ethene has been analytically and numerically investigated in a Heavi-si de function temperature field and through a normal shock wave. The results demonstrate that, while the reaction temperature increases, the maximum val ue of ethene yield is increased, and the optimal reaction duration is sharp ly shortened. For the identical initial reaction temperature, the maximum v alue of ethene yield through a stationary normal shock wave is less than th at in a Heavi-side function temperature field. However, the ethene consumpt ion after the maximum value in the former case is less than that in the lat ter. Higher ethene yield will be obtained by using the gasdynamic heating m ethod than by using the current methods.