Co-feed experiments using 13C-methyl chloride and 12C-ethene or 12C-propene at 400 °C indicated that the conversion level of each compound is directly related to its proton affinity.
"The UK market [its first international market outside the U.S.] is going extremely well," he said, with the conversion level already at 45percentt after launching last year (it took years to get to 50percentt in the U.S., he noted, and rates have to be at 30percentto"to make the model work").
At the same conversion level, the yield ratio of middle distillates to naphtha for this new process was two times higher than that for VGO hydrocracking.
The results indicate that the required T for the effective decomposition of Nap decreases with the increase in inlet concentration of ozone (CO3,in) at the same conversion level of Nap (XNap).
At the same conversion level, it increases with polymerization temperature.
It can be found that, at the similar conversion level, when fresh feed and cycle oil were fed and cracked separately, the product distribution significantly improved, lower yields of dry gas and coke, and higher yields of liquid products (LPG + gasoline + diesel) can be achieved.
Temperature dependent catalytic activity results revealed that at lower temperatures (<775 °C) the Cr-doped sample showed much higher activity while at higher temperatures (∼825 °C) the conversions levels were found to be similar on both the samples.
Further, we show that an empirical relation for coke formation and asphaltene conversion gives a reasonable description of the kinetics and prediction of the cracking behavior at high conversion level or long residence time, and that this method is much simpler.
At comparable conversion level (∼25%), the ordered mesoporous H-galloaluminosilicate was more selective to aromatics (BTX), with 58.3% as compared to 42.5% for conventional sample.
The model allows for changes in the particle size due to the disintegration of the solid structure at some critical conversion level.
