Process for producing paraformaldehyde of high formaldehyde content
AssigneeMitsui Toatsu Chemicals, Inc.
InventorYasuhiko Sakaguchi
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Abstract
Paraformaldehyde of high formaldehyde content is produced by cooling and solidifying a 78-83 wt. % aqueous formaldehyde solution, and drying the resulting paraformaldehyde by means of microwave heating.
Claims4
A process for producing paraformaldehyde containing at least 88% by weight of formaldehyde by drying paraformaldehyde obtained by cooling and solidifying a 78-83 wt. % aqueous formaldehyde solution which comprises effecting the drying by means of microwave heating that is carried out while air at a temperature of 30-100.degree. C. is passed through the paraformaldehyde wherein said paraformaldehyde exhibits superior warm water solubility after 30 days compared to paraformaldehyde dried by hot air or far infrared rays.
Dependencies are inferred from the claim text.