A layperson asks about gasoline desulfurization
Thread Content
Experts from various petrochemical companies, as a layperson, I have a small question: what is the reason for using thiols in Doctor’ s experiments? What’s the meaning? From a technical standpoint, all current methods for desulfurizing thiols merely oxidize the thiols to disulfides; the sulfur compounds are not separated from gasoline but remain dissolved in it. Is there any technology in the petrochemical industry to remove disulfides from gasoline at present? What’s the point of simply converting thiol to disulfide and passing the doctoral experiment?
Organic solvent extraction can be considered: the thiol is dissolved in the solvent and then separated out, with the solvent being reused
The Doctor experiment is a simple method for quickly detecting thiol compounds, and its positive result indicates a low level of thiols in the oil. The desulfurization process now consists of two steps: alkaline washing and oxidative regeneration. By separating these two steps, the disulfides formed during oxidation remain in the alkaline solution. If this alkaline solution is then used to wash gasoline, the disulfides end up back in the gasoline. Therefore, another type of oil is used to extract the disulfides from the alkaline solution, so that the gasoline obtained after deodorization contains almost no disulfides. If the alkali washing and oxidation processes are combined, the disulfides remain soluble in gasoline; what the original poster is referring to is this process.