Paraformaldehyde is a Safe Mixture

  Paraformaldehyde (CH2O) n, also known as solid formaldehyde, formaldehyde polymer, low molecular weight formaldehyde polymerization degree n is about 8-12, solubility is 80, there is a strong formaldehyde smell, polymerization degree n above 12 solubility is 120-170, insoluble in ethanol, propanol, soluble in dilute acid and dilute alkali solution, melting decomposition quickly. It does not have some mechanical properties of plastic, and cannot be processed into a film, which can be used as a disinfectant, a fungicide, and the manufacture of resins and artificial ivory, etc., which can be obtained by polymerization of pure formaldehyde under alkaline conditions.

  Paraformaldehyde is made of formaldehyde dehydration, concentration and drying, its production is divided into two steps: first, under negative pressure heating 37% of formaldehyde to remove part of the water, concentrated into 65%-70% of concentrated aldehyde polymerization under alkaline catalytic conditions, and then dried and finished products, it is worth noting that: to reduce the loss of aldehydes, it is necessary to reduce the boiling point, so the above process is carried out under vacuum negative pressure.

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