Indicators for salt and heavy metal content in coking feedstocks
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When the salt and heavy metal contents in coking feedstocks are high, it can exacerbate coking in the coking furnace tubes. What are the control requirements in this regard? I would appreciate some advice from experts.
The salt content should preferably be less than 10 milligrams per gram. There are no strict requirements regarding heavy metals, but it is well established that higher levels of heavy metals can lead to an increased rate of coking in heating furnaces. Please let other experts share their opinions.
I just found some information: Residues with a heavy metal content of over 800 micrograms per gram are extremely difficult to process; the only options are hydroprocessing of such residues using a slurry bed reactor (in the industrial demonstration phase) or coking processes
Excuse me, upstairs – when it is said that \"residues with a heavy metal content of over 800 micrograms per gram are extremely difficult to process\", what processing method does that refer to? Is it delayed coking as well?
To achieve a salt content of 10 milligrams in the coking material. . . It’s very difficult. . . After electrodesalination, the salt content in the crude oil is generally between 5 milligrams and 10 milligrams. . . The residual sludge and wax oil after removing gasoline and diesel are generally 10–30 milligrams. . . The salt content in the remaining slag generally does not fall below 10 milligrams. . . Generally, it contains about 30 milligrams of salt, so there shouldn’t be any major issues. . . If a high salt content is detected, the coking material can be desalted again, just as catalytic materials are desalted a second time. . . To keep the salt content in the residue below 30 milligrams. . . The delayed coking process is, in essence, a waste treatment and recycling facility; the requirements regarding the type of raw material used are not very strict, so there’s no need to worry too much about it. . . Hahaha Last edited by wangsc on 2009-2-6 16:52]
The answer above is correct; constant pressure and vacuum distillation, which are difficult to handle even in coking processes, are even harder to process.
“Residues with heavy metals levels above 800 micrograms per gram are extremely difficult to process; the only options are delayed coking or solvent deasphalting, as these methods prevent catalyst poisoning or a rapid decline in catalyst activity