ABSTRACT

Formaldehyde is one of the most important C1 building blocks used in the chemical industry. It is handled in aqueous solutions, in which it is predominantly chemically bound. Solid precipitation from these solutions in the form of poly(oxymethylene)glycols imposes restrictions on many technical processes. As previously reported literature data on the solubility of formaldehyde in aqueous solutions is old, scarce, contradictory, and only very poorly documented, new measurements were carried out in the present work. Solubility data for this reactive system is reported for temperatures between 30 C and 90 C, corresponding to overall formaldehyde mass fractions up to about 0.81 g?g-1. The study covers also the influence of the addition of sulfuric acid and methanol. Furthermore, the solubility of trioxane, a stable cyclic trimer of formaldehyde in aqueous solutions, was studied at temperatures between 20 C and 55 C.

Compounds

#	Formula	Name
1	CH4O	methanol
2	CH2O	methanal
3	H2O	water
4	C3H6O3	1,3,5-trioxane

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	4 3	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mass fraction - 4; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	19
POMD	2 1 3	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 1 Mass fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	18

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solubility of Formaldehyde and Trioxane in Aqueous Solutions

grutzner, T.[Thomas], Hasse, H.[Hans]

ABSTRACT