The Dr. experiment for aromatic paraffin oil failed (hydrogen sulfide) – what’s the reason? Please help, experts!
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Why is hydrogen sulfide carried into the light aromatic distillation tower?
Whether the sulfur content of the feed naphtha is high or not, and whether to use butane fractions or not – I think it’s better to start by looking for the cause in the feed material itself.
The sulfur content in the naphtha used as raw material was found to be low, with a small amount of C4 present. In any case, after passing through the separation systems (desorption tower, stabilization tower), there is almost no sulfur left in the liquefied gas – so why is it carried into the distillation tower?
I also think it’s related to the raw materials, but why can’t it be separated?
In the aromatization process, the source of sulfur content is the C4 feedstock. Based on my experience, too much sulfur in the raw materials has a significant impact on both the equipment and the quality of the products. Modifications made: 1. The oil and gas after reaction are fed into a device equipped with Bauer rings to corrode the Bauer iron rings and reduce the burden on subsequent processing; 2. The resulting oil product is subjected to alkaline washing.
There is no hydrogen sulfide (only in trace amounts) in the absorbent; so why does it become apparent in the light aromatic hydrocarbons distillation column?
I’m not sure whether you’re referring to naphtha aromatization or LPG aromatization. If you need to discuss this, feel free to contact me. I have been working in naphtha aromatization since 2013; my QQ number is 465974540. I’ll answer all your questions one by one
Operating liquefied gas aromatization on its own no longer yields any profits! After naphtha is fed in, hydrogen sulfide ends up in the product! It’s not possible to determine why it ended up in the product
Possible operational issues in the hydrogen sulfide removal stripping tower; if it is not removed completely, it will end up in the products from the distillation tower. However, it is usually pumice that causes corrosion-related defects; heavy stones generally do not have such problems. Of course, this is different if naphtha is not distinguished by its density.