| http://www.w3.org/ns/prov#value | - ll as oxygencan be used for vaporizing the alkanol.DETAILED DESCRIPTION OF THE INVENTIONC.sub.1 -C.sub.4 -alkanols for the process according to the invention are for example methanol, ethanol, propanol, isopropanol, butanol, sec-butanol, i-butanol, preferably methanol and ethanol, particularly preferably methanol.
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