Experiment on adding water to 93# gasoline
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Dear teachers, I have a client who used our company’s 93# gasoline (produced by a refinery in Shandong). After taking a sample of this gasoline and adding half water to it for testing, numerous network-like bubbles appeared near the oil-water interface after shaking. Moreover, the separation of oil from water was slow, and the water layer became opaque (turbid). In contrast, Sinopec’s gasoline separated from water more quickly, without those network-like bubbles, and the water layer wasn’t as turbid. I would like to ask you all what could be the reason for this. Also, apart from measuring alcohol, what else can be determined through this water-addition test? ? The customer didn’t know how to answer my question.
What mediums are used to blend the gasoline at your company?
Well, that harmony stuff comes from Jincheng in Shandong; they have the intention but not the means to achieve it
It contains alcohol-based substances or methylal, etc., which is the cause
There’s definitely no methyl acetal, and the methanol content in the “alcohols” also doesn’t exceed the limits
If the alcohol level is within the specified limits, this kind of situation shouldn’t occur. However, this shouldn’t happen at Jincheng Petrochemical either; you can take samples from your oil depot and conduct another test by adding water. Or ask the laboratory about the quality of this batch of oil
Under the action of an activator, gasoline passes through a desulfurization and alcohol removal unit, during which some of the alcohols are converted into ethers; this results in a pass in the Drabek test, the acceptable standard for which is a thiol content of no more than 10 ppm. So, substances such as alcohols are present inside, causing a turbid, network-like structure.
This is a simple method for detecting surfactants in oils; the appearance of network-like bubbles and turbidity indicate the presence of additives containing chemical substances, or hydrophilic substances.
What was said upstairs makes sense; it’s more likely that a certain type of additive in the fuel is to blame. Such as cleaning agents.