BENZYL DIETHYL PHOSPHITE AS A COKE INHIBITOR DURING NAPHTHA PYROLYSIS- TUBULAR REACTOR STUDIES

The effectiveness of benzyl diethyl phosphite as a coke inhibitor duri ng naphtha pyrolysis was investigated in a tubular reactor at 1073 K a nd atmospheric pressure. Significant reduction in the coking rate was achieved by adding benzyl diethyl phosphite to the feed. The effect of toluene, methylcyclohexane, 1-octene and carbon disulfide on the rate of coke formation was also investigated. Toluene enhanced the rate of coke formation significantly, whereas with methylcyclohexane and 1-oc tene the increase was less appreciable. Carbon disulphide decreased th e amount of coke deposited initially, but with increasing run time the asymptotic coking rates were found to be higher than for straight-run naphtha. The yields of propylene, 1,3-butadiene and butenes increased on addition of carbon disulphide.