马来松香中加合物测定方法的探讨

<正>本文根据Aldrich从松香混合物中分离松香加合物的方法,拟定从马来松香中分离测定马来酐加合物的方法。探讨了分离的最佳条件,提出了用甲醇—正庚烷—水或甲醇—石油醚—水体系预先萃取分离加合物,再用重量法或容量法测定加合物含量的方法。方法的相对误差为±2—6％。

A Research on the Method of Determining the Adducts in Maleic Modified Rosin

Based on Aldrich’s method of separating rosin adducts from rosin mixtures, a methcd of separating rcsin-maleic anhydride adducts from maleic mcdified rosin and determining the content of the adducts has been devised. Optimun conditions for separation have been investigated. Separative adducts can be first extracted by methanol-heptane-water or methanol-petroleum ether (60o-90℃)-water system and then determined by titrimetry or gravimetry with an experimental error of ±2-6%.?75