Solid–Liquid Equilibria and Kinetics of the Solid Formation in Binary and Ternary Mixtures Containing (Formaldehyde + Water + Methanol)

Solid precipitation from aqueous formaldehyde solutions is a major technical problem, leading to troubles such as plugging and fouling. While these problems are ubiquitous in technology, it hard predict them, so their mitigation difficult. Data on the formation of solid phase formaldehyde-containing systems scarce basically only available for system (formaldehyde + water); even few data contradictory. We have tackled different sides present work. First, new method measuring solid–liquid equilibria kinetics was developed, shown that, technically relevant conditions, long-term effects essential: may take over 1000 days until equilibrium reached. Using this technique, reliable water) were obtained. The liquidus line diagram that has two branches meeting eutectic point: one where water, formaldehyde-rich. solubility found be much lower than most previous works. As methanol often used stabilizing solutions, we also investigated methanol) water methanol). Furthermore, formaldehyde-rich solids acquired studied systems. Based extensive work chemical reaction kinetics, physico-chemical model which describes both well formation. It very slow kinetic mainly caused by interaction liquid single oligomer with limit