Methanol residue Ph
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Seniors, come quickly~~~~~ Xiao Bai has a question: The pH value of the methanol residue is high. Why is that? Water is neutral, and methanol is also neutral – so why could it be on the high side?
There’s another issue that cannot be resolved chemically; analyze the components of the methanol residue – what might they be? For example, some materials may end up in the gas phase during vaporization even though they are not theoretically volatile from a chemical perspective; this is an inappropriate example. What could be the most likely component in methanol?
In my opinion, the possible reasons are as follows: 1. The ammonia removal efficiency in the purification unit is poor, which allows trace amounts of ammonia to enter the synthesis system and react with methanol to produce monomethylamine, dimethylamine, trimethylamine, etc. Monomethylamine is highly alkaline when hydrolyzed, so the pH of the methanol residue remains high. 2. Excessive alkali addition during distillation results in a high pH value in the residue. The main reason is the first one
Well, I also think it’s likely that ammonia has mixed in; otherwise, it wouldn’t be alkaline
I completely agree with what was said on the 3rd floor; it’s down to these two reasons
What was said on the 3rd floor is correct; basically, these are the two reasons. Of course, it’s also important to pay attention to whether the pH test results are accurate