Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-12-29
1977-07-19
Mars, Howard T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C 4710
Patent
active
040368912
ABSTRACT:
A process for the preparation of paraformaldehyde in which concentrated formaldehyde solution is formed into powdery paraformaldehyde by spraying the solution into a spray cooling and drying chamber and contacting the sprayed solution with a stream of inert gas such as nitrogen or air having a temperature of about 30.degree.-40.degree. C. The particulate product, which may be slightly sticky and agglomerated, is transferred from the spray cooling tower to a multistage fluidized bed each stage of which is fluidized with air of temperature higher than that of the preceding stage. Inert gas used to fluidize the particles enters the first stage, which is preferably a vibratory fluidized bed, at a temperature in the range 45-70.degree. C. Particles in the first stage are simultaneously cured, dried, and concentrated to preferably about 90-91% formaldehyde concentration. The concentrated powder from the first stage is transferred to a second fluidized stage having the fluidized gas entering the bed at a temperature in the range 70-100.degree. C. The resultant product is further concentrated to a formaldehyde concentration of preferably about 95%. The final product is particulate in form, nonsticky, free-flowing, and has little or no dust.
REFERENCES:
patent: 3316309 (1967-06-01), Mann et al.
patent: 3595926 (1971-07-01), Mann et al.
patent: 3772392 (1973-11-01), Paleologo et al.
Hansen Ove E.
Moller Jens C. T.
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