A method of following the course of the phenol‐formaldehyde reaction

Abstract

FINN AND ROGERS-PHENOL-FORMALDEH YDE REACTION 51'(b) Removal of mineral acid used to catalyse a reaction, e.g., hydrolysis of esters, amides or nitriles.(c) Removal ofmineral acid arisingin a reaction (e.g., hydrolysis of a halogenated compound), if necessary continuously, so as to maintain nearly neutral pII.(d) Recovery of valuable organic acids from biological material or fermentadon liquors.(el Recovery of metals, such as chromium or vanadium, after Thc course of thc rcaction bctwccn phenol and formaldehyde has bucn followcd by observing the temperatures at which thc rcaction mixture just becomes turbid. The effect of temperature, dilution with water and methyl alcohol, the concentration and nature of the camlysr on the course of the reaction has bccn observed by this means. The method may also be used to judge nny chosen cnd point of the condcnsation, where only lightly condensed resins are concerned.