ASTM D803-15 (2020) pdf free.Standard Test Methods for Testing Tall oil.
Tall oil,both crude and refined,is an important byproduct of the alkaline (kraft) pulping of pine wood. It consistsprimarily of fatty acids，resin acids, and neutral materials; thelevels of these various components depend on factors such asthe species of pine tree，geographic location, climate,etc.Tall oil is used primarily as a commercial source offatty acids and rosin，and, therefore,reliable methods for the
analysis of these components is necessary.
Reagent grade chemicals shall be used in all tests.Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where such specifications are available.’ Other grades may be used,provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy ofthe determination.
Unless otherwise indicated, references to water shall beunderstood to mean distilled water or deionized water.
As with manv industrial chemicale tho.obtaining a representative sample of tall oil depends on the container to be sampled and the uniformity of the material to besampled. No specific standard procedure for sampling tall oil has been developed but Test Method D1466 and Practice E300describe applicable methods when the tall oil contains noseparated solids or separated water. If rosin has separated, the rosin can be redissolved by heating and agitating the materialto be sampled until it is homogeneous.If separated water is present, special procedures should be followed to ensue that arepresentative sample be obtained.The selection of an appropriate procedure will depend on the water content and the typeof container being sampled.
Heat the entire sample in a closed container fitted witha capillary vent or its equivalent. Some kind of agitation, evenif done occasionally by hand,saves much time. Heat in a forcedair oven in order to dissolve any crystalline material.Atemperature of 100°C is usually sufficient to dissolve crystalspresent in crude tall oil, but a temperature as high as 160°Cmay be required to remove rosin crystals from distilled tall oil.Withdraw the specimens only when all crystalline matter hasdissolved and when the entire sample becomes a homogeneousfluid after thorough stirring.ASTM D803 pdf download.