The sulfur content in National V gasoline is around 5 ppm at present; therefore, the sulfur content in mercaptans surely does not exceed 10 ppm, so is it unnecessary to carry out alkaline washing for deodorization?
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However, here the ratio of thiol sulfur to total sulfur is sometimes a bit higher; for example, if the total sulfur content in the finished product is 6 ppm, the thiol sulfur level might be 7–8 ppm. I think there must be some inconsistency somewhere, after all, thiol sulfur is a subset of total sulfur. What do you all think?
It might be due to different testing methods; the sulfur content in the finished product is calculated based on S. And the directly measured thiol will definitely have a higher molecular weight than that of S.
Although the total sulfur content is less than 10, it is still possible that the test will not pass
Yes, in our doctoral experiments, they don’t always pass; but I’ve seen in some materials that it’s sufficient if one of the two passes, one being qualitative and the other quantitative
In addition to the total sulfur content, the quality standards for National V gasoline also include the Drabek test; there have been cases where the test failed even when the thiol content was less than 3 ppm