The ultimate fate of the defoamer (linear polysiloxane) injected into the aromatic hydrocarbon extraction unit
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I would like to ask the experts: What happens to the antifoam agent (linear polysiloxane) that is injected into the aromatic hydrocarbon extraction unit? Is it used in the extraction of aromatic hydrocarbons, in the raffinate oil, or removed during solvent regeneration?
In the end, most of it goes to the regeneration tank, with only a small amount of defoamer remaining in the system. If too much defoamer is added, it can lead to an increase in the tar content in the system; this depends on how much tar your system is able to tolerate. Generally, the defoamer makes up 2-3 ppm of the total circulating solvent
A very small portion goes into the raffinate oil, while the vast majority goes into the solvent regeneration tower; as the phenanthrene solvent is removed, some also ends up in the filter. Macromolecular substances