 Paraformaldehyde is a linear, low molecular polymerisation product of Formaldehyde and is obtained as granular, solid material with a Formaldehyde content of commonly about 92 %. Paraformaldehyde is used for the same applications as Formaldehyde itself, yet is preferred whenever almost water-free operation or special control of the reactivity of the introduced Formaldehyde is necessary.
According to the Meissner process, Paraformaldehyde is produced by careful reconcentration of aqueous Formaldehyde solutions, followed by controlled polymerisation and solidification. Depending on the envisaged plant capacity, either belt driers, or spray drying units, are used for the latter. Paraformaldehyde of up to 96 % Formaldehyde concentration and with optimum reactivity and storage characteristics can be produced with the Meissner process.
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