Nicotinic acid at 105% concentration turns yellow
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About 10 days after starting the machine again after maintenance, the color of the nicotinic acid at 105% level remained light yellow! The specific reason has not been identified; I hope experienced colleagues can help explain this. Thank you
The cause has been identified: catalyst powder was introduced into the sulfuric acid. Thank you all for your attention.
The color of trace amounts of vanadyl sulfate.