Regarding the water solubility of methanol
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The specifications for methanol product 1+3 are higher than those for 1+9. Water solubility refers to the soluble impurities in methanol; as the concentration of methanol in the solution decreases, alcohol-soluble impurities precipitate, causing the solution to become turbid. In that case, a solution prepared by adding 9 parts of water will certainly have a lower alcohol concentration than one prepared by adding 3 parts of water; more impurities will precipitate out, making it possible to detect the amount of impurities more accurately. So why is the 1+3 indicator high, and how should it be interpreted?
“The statement that ‘alcohol-soluble impurities precipitate when the methanol concentration in the solution decreases’ is ambiguous; it refers to certain alcohols with carbon chains of 6–10 atoms that are soluble in methanol, but which precipitate as the methanol concentration drops. The content of these impurities in refined methanol is extremely low, to the point where it can be ignored. Therefore, the water solubility of methanol depends mainly on lower alcohols with carbon counts below 5 as well as carbonyl compounds. For the same methanol product, the percentage of 1+3 methanol is higher than that of 1+9 methanol; as a result, the percentage of impurities in it is also higher, which makes it more likely for turbidity to occur. Hence, 1+3 may become turbid while 1+9 does not necessarily do so, which is why the 1+3 specification has a higher value.
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