Production of high-concentration formaldehyde solutions

Details Production of high-concentration formaldehyde solutions Production of high-concentration formaldehyde solutions

2008-03-18

2008-03-18

Witherspoon, Sikarl A. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S493000, C528S129000

Reexamination Certificate

active

10547732

ABSTRACT:
Process for preparing high-concentration formaldehyde solutions having a CH2O content of ≧50% by weight from an aqueous formaldehyde solution having a lower CH2O content by evaporation of part of this solution (partial evaporation), in which the aqueous formaldehyde solution is heated to an evaporation temperature T at which the gas phase becomes enriched in water relative to the liquid phase and the gas phase formed is taken off continuously or discontinuously, wherein the evaporation temperature T obeys the relationship:in-line-formulae description="In-line Formulae" end="lead"?T[° C.]<Tmax[° C.]in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?where Tmax(c)=A+B×(c/100)+C×(c/100)2+D×(c/100)3in-line-formulae description="In-line Formulae" end="tail"?andA=+68.759, B=+124.77, C=−12.851, D=−10.095,where c is the instantaneous CH2O content of the aqueous formaldehyde solution during the evaporation in percent by weight and is from 20 to 99% by weight.

REFERENCES:
patent: 2004/0097762 (2004-05-01), Hoffmockel et al.
patent: 100 62 814 (2002-06-01), None
patent: 1190682 (1968-03-01), None

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