Highly concentrated formaldehyde solution, production and...

Details Highly concentrated formaldehyde solution, production and... Highly concentrated formaldehyde solution, production and...

2007-03-20

2007-03-20

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C252S001000

Reexamination Certificate

active

10494762

ABSTRACT:
In an aqueous formaldehyde solution comprising formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in a total concentration x of ≧65% by weight, the mean molar massMof the polyoxymethylene glycols is, as a function of the formaldehyde concentration, equal to or less than the values given by equation I:(M_g⁢/⁢mol)=48+6.589·10-1·(x%⁢⁢by⁢⁢weight)+4.725·102·⁢(x%⁢⁢by⁢⁢weight)2-3.434·10-3·(x%⁢⁢by⁢⁢weight)3+⁢9.625·10-5·(x%⁢⁢by⁢⁢weight)4-1.172·106·⁢(x%⁢⁢by⁢⁢weight)5+5.357·10-9·(x%⁢⁢by⁢⁢weight)6(I)where:Mis the mean molar mass, andx is the total concentration of formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in % by weight (total formaldehyde concentration).

REFERENCES:
patent: 6610888 (2003-08-01), Stroefer et al.
patent: 1 063 221 (2000-12-01), None
patent: 1190682 (1970-05-01), None
Ullmann's Encyclopedia of Industrial Chemistry, Edition 2000 electronic release, Formaldehyde; Chapter 2 (physical properties), 2.2 Laqueous solutions).

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