Abstract
mixture of propane and oxygen was passed through quarz tube hav-ing an internal diameter of 23mm.The tube was packed with fused alumina having a diameter of about 4mm.The reaction was carried out at 600-950°C and the pressure of100mmHg.To clarify the effect of temperature on the yields of olefins, a mixture of propane and oxygen in a mol ratio of 1: 0.129 was reacted at a time of contact of 0.32-0.83 sec and 0.55-1.42 sec. For the formation of propylene, 800-850°C was found to be proper, and the yields of total olefins were also maximum at these temperature ranges.
The percentage of conversion of oxygen was nearly 100 at the higher temperature-than 820°C when the time of contact was 0.3 sec and longer.It was also 100 at the higher temperature than 750°C when the time of contact was0.71 and longer.
The optimum time of contact for the formation of propylene decreased with the rise in the temperature at a range of 0.25-3.92 sec, whereas the formation of ethylene increased with the increase of time of contact at a range up to 0.4 sec.
The optimum ratio of oxygen to propane was found to be 0.11-0.17.It was interesting-to note that the rate of reaction of hydrogen with oxygen increased with the rise in the temperature, whereas at lower temperature the formation of CO and CO2 was-predominant.At an oxygen mol percentage of 11.2-11.6, the yields of propylene and ethylene were 9.9-12.6 and 48.9-44.6% respectively and the yields of total olefins reached up to 58.5%.
