Refining crude tall oil recovered from pulping of pine wood involves feeding crude tall oil into column distiller, where it is separated into desired fractions, and at least part of which are recovered as product flow

摘要

Crude tall oil recovered from pulping of pine wood with a known harvest time is refined by feeding crude tall oil into a column distiller, where it is separated into desired fractions, and at least part of which are recovered as a product flow. Refining crude tall oil recovered from the pulping of pine wood with a known harvest time involves feeding crude tall oil into a column distiller, where it is separated into desired fractions, where at least part of which are recovered as a product flow. The density of the crude tall oil fed into the column distiller and of the product flow is measured. The density is measured to an accuracy of =4 decimal places or, correspondingly, 5 significant figures as a function of the temperature. The compositions of the flows are calculated from the density values by using correlation functions derived from the chemical compositions of the flows. The correlation functions are obtained on the basis of performed laboratory analyses of corresponding flows using temperature compensation to specify the correlations, and taking into account the regular annual cycle variation in the wood composition of fresh wood, and the conditions of the column distiller are adjusted on the basis of the composition of the feed and the product flow. An independent claim is also included for a device for measurement of the density of liquid flows to measure the density of the feed and product flows of crude tall oil distilleries and reproducibly determine the density of the liquid flow of tall oil or its fraction, to an accuracy of =4 decimal places or, correspondingly, 5 significant figures.