The raw material used in the industrial production of formaldehyde is methanol, or methyl alcohol. The methanol is evaporated and mixed with air. This gaseous mixture then goes to a reactor. There, methanol vapour reacts with oxygen from the air to form formaldehyde. The gas that comes out of the reactor consists mainly of nitrogen and formaldehyde. Sometimes it also contains some non-converted methanol. This gaseous mixture is led to an absorber, where the formaldehyde gas dissolves in water.