| 摘要 |
<p>Fatty acid and rosin, or a mixture of these, as well as hard pitch of a new type are manufactured starting from oil pitch produced in the distillation of tall oil, by a process wherein said tall oil pitch is initially heated, either as such or in a solvent, at a temperature of 200 DEG -300 DEG C together with an alkali reagent, said alkali comprising 5-25 % of the amount of pitch; the product thus obtained is acidified into oil having an acid value of 50-150; the oil obtained is distilled, either as such or after the removal of the salt produced in the acidification, at a pressure lower than 50 mm Hg; whereby there is obtained firstly a distillate with the acid value of 100-190 and which may be refined further e.g., by the known fraction distillation process at lowered pressure, and secondly a distillation residue with a softening point exceeding 50 DEG C.</p> |
