{TAIL ~ An object} of the present invention is to overcome the disadvantages of the prior art by directly contacting {HEAD ~ 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 
{ TAIL ~ An object } of the present invention is to overcome the disadvantages of the prior art by directly contacting { HEAD ~ 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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