{HEAD ~ An object} of {TAIL ~ the present invention} is to overcome the disadvantages of the prior art by directly contacting a non condensible gas as a feed gas with heated water, thereby humidifying the feed gas, while utilizing the heat possessed by the formaldehyde product gas as a heat source for heating the water 
of
{ HEAD ~ An object } of { TAIL ~ the present invention } is to overcome the disadvantages of the prior art by directly contacting a non condensible gas as a feed gas with heated water , thereby humidifying the feed gas , while utilizing the heat possessed by the formaldehyde product gas as a heat source for heating the water
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