Regarding the issue of the aromatic hydrocarbon extraction solvent ratio
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Currently, the main extraction processes are extraction distillation and liquid-liquid extraction; in both cases, it is necessary to control the solvent ratio based on the volume of material to be processed, with this ratio generally ranging between 3.5 and 4.5 depending on the amount being processed. I have a question: Some devices have the same processing capacity, but the solvent ratio is only around 2 or so. Why is that? Is it the solvent that’s different?
It is related to both the process and the solvent chosen
This post was last edited by Refiner on 2018-7-23 08:43. We use sulfolane for liquid-liquid extraction, with the solvent ratio maintained at around 2.6
The actual value for liquid-liquid extraction was 3.4, with a design value of 3.5; for distillation extraction, it was 4.25, and the design range was 4.2–4.5.
The aromatic content in the feed of the two systems can be compared
The solvent ratio is adjusted based on the ratio of aromatics to non-aromatics in the feed; generally, the higher the content of aromatics in the feed, the higher the solvent ratio can be, and vice versa