Stabilized powdered formaldehyde

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 47/02 (2006.01) C07C 45/86 (2006.01) C07C 47/04 (2006.01) C08L 61/02 (2006.01) G01N 1/00 (2006.01) G01N 1/30 (2006.01) G01N 33/00 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2475333

According to an aspect of the invention, a polymerized form of formaldehyde is available in granular form containing a polymerized form of formaldehyde, such as paraformaldehyde, a buffer, such as sodium phosphate dibasic anhydrous, and a stabilizer, such as hydroxymethyl cellulose, or hydroxypropyl methyl cellulose. When added to an aqueous solvent, the paraformaldehyde can dissolve in alkaline solution, and depolymerizes into a formaldehyde solution containing a stabilizer. Optionally a second member of the buffer pair or another buffer or pH adjuster can be used. The stabilized depolymerized formaldehyde solution is then ready for use, or can be modified by addition of other substances, such as sodium phosphate monobasic monohydrate. Additionally, an additional buffer may be included in the granular mixture to increase the rate at which the solid dissolves and depolymerizes.

Selon un aspect de la présente invention, on obtient une forme polymérisée de formaldéhyde sous une forme granulaire contenant une forme polymérisée de formaldéhyde, telle qu'un paraformaldéhyde, un tampon, tel que du phosphate de sodium dibasique anhydre, et un agent stabilisateur, tel que de la cellulose hydroxyméthyle ou de la cellulose hydroxypropyl-méthyle. Lorsqu'il est ajouté à un solvant aqueux, ce paraformaldéhyde peut se dissoudre dans une solution alcaline et se dépolymériser en une solution de formaldéhyde contenant un agent stabilisateur. On peut facultativement utiliser le deuxième élément de la paire de tampons, un autre tampon ou un régulateur de pH. La solution de formaldéhyde dépolymérisée stabilisée est ensuite prête à l'emploi. Elle peut également être modifiée par l'ajout d'autres substances, telles qu'un monohydrate monobasique de phosphate de sodium. On peut ajouter facultativement un tampon supplémentaire dans le mélange granulaire, de sorte à augmenter la vitesse à laquelle le solide se dissout et se dépolymérise.

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