How to separate methanol and dimethyl ether from water
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Our process involves alkylation, and we are wondering what methods can be used to separate methanol and dimethyl ether from water, as well as what methods can be used to determine the amount of water present in methanol and dimethyl ether. Please, if anyone knows, I really need it urgently. Since the COD level in our wastewater is particularly high, we want to see if it is brought in as a result of hydrocarbon removal. Thank you.
The trace amount of methanol in wastewater can be detected using gas chromatography; a high level of methanol definitely results in a high COD value； Trace amounts of water in methanol can be determined using the microcoulomb Karl Fischer method. If it is not known whether there is more water or more methanol, the density can be measured to estimate the approximate content.
Why are there large amounts of methanol and dimethyl ether in the wastewater discharged from the alkylation unit? The raw materials for this device are low-carbon hydrocarbons (alkenes and alkanes), which are converted into alkanes through catalysis by sulfuric acid or hydrofluoric acid. In this reaction, aren’t there any conditions that would allow the formation of methanol and dimethyl ether?