What to do if you fail your doctoral experiments?
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Hello everyone, the sulfur content in our finished gasoline is 330 ppm, with thiol levels at 9.3 ppm. The copper strip corrosion test results are at level 1. In short, everything meets the requirements, but only the doctor’s test fails – I’m not sure why We can solve it with additives. But I want to know the reason behind this. I once suspected that it was due to elemental sulfur, as it wasn’t extracted thoroughly; I’m not sure if that’s the cause. Are there any other solutions that can be achieved without using a device? I would also appreciate some guidance from the senior engineers and experts.
It mainly depends on the form of thiol present in the raw materials; it is difficult to achieve effective results using conventional deodorization methods for some components, so here we consider a sample to be qualified if either the Doctor component or the thiolic sulfur component meets the requirements.
Our recent doctoral experiments also often fail; are there any aspects of the manufacturing process that need attention?
There may also be substances that interfere with the analysis results, affecting the outcomes of the Doctor test and the analysis of thiol sulfur!
There is a lot of information available on the interaction between doctoral experiments and the molecular weight of thiol sulfides. One **standard requirement needs to be met. The parameters of the desulfurization unit, such as the air flow rate in the fixed bed and the amount of activator injected, can be adjusted ； The alkali concentration in the alkali extraction method, the amount of alkali circulated, the catalyst concentration, and so on ； There are also some additives and such. In short, when this situation occurs, there are many qualitative explanations available, but few in-depth discussions. For example, the poster mentioned that \"additives can solve the problem\" – could you explain that in more detail?
Macromolecular thiols have a less significant impact on the Drabek test compared to small molecular thiols; even when the thiol content is low, the Drabek test can still yield an unsatisfactory result due to the higher proportion of macromolecular thiols. It would be best if the poster could introduce the technological approach used in your device as well as the information regarding the raw materials, as this will help everyone to focus their efforts more effectively.
The problem now is that the oil has already been processed and blended in the plant, so it’s no longer possible to feed it into the plant. The device is still operating normally. I want to address the issue of macromolecular sulfur directly during the adjustment in the finished product warehouse; can I use an oxidative desulfurization agent? Have any manufacturers used it?