Coking light paraffin oil and heavy paraffin oil
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There is not much difference in the analytical composition of coking light paraffin oil and heavy paraffin oil. Then why can light paraffin oil be subjected to hydrocracking, while there is disagreement regarding the use of heavy paraffin oil for this purpose? This post was last edited by chengkang on 2009-3-17 13:03]
What does dewaxing decoking mean? The coker light wax oil sent for hydrocracking also constitutes only a small portion; it cannot be mixed in large amounts with straight-run wax oil.
Heavy paraffin oil has a higher viscosity than light paraffin oil; it also contains higher levels of aromatics and sulfur, whereas most of the components in light paraffin oil are saturated hydrocarbons. Therefore, I believe this is likely the reason why it cannot be hydrogenated
Different sulfur and nitrogen contents cause varying degrees of damage to the catalyst
In coking, heavy metals as well as sulfur and nitrogen accumulate at the ends; heavy wax oil contains high levels of heavy metals, sulfur, and nitrogen, with a residue content exceeding 1%. Another issue is that heavy wax oil tends to contain coke particles.
Heavy paraffinic oils generally have a high residue content, which leads to intense backwashing of the hydrogenation filters; moreover, they are harmful to the catalysts and can cause damage to them. Even sometimes, heavy paraffin oil contains coke powder, which causes even greater damage to the catalyst.
I think it's also because of the high levels of residual wax and coke, as well as high contents of heavy metals and sulfur and nitrogen.
Another point is that coking powder tends to be entrained in heavy paraffin oil. :handshake
Because heavy paraffinic oils contain a high amount of polycyclic aromatic hydrocarbons, which are harmful to catalysts and can easily cause coking in them
Why is it called wax oil? What does \"wax\" mean?