硫酸盐木质素 差示扫描量热法测定玻璃化转变温度

[中文适用范围]： 本文件描述了一种测定硫酸盐木素玻璃化转变温度 (Tg) 的方法。该方法采用差示扫描量热法 (DSC)。该方法适用于使用不同的分离技术（例如，用盐酸、硫酸等酸化，以及使用气态二氧化碳碳化）从硫酸盐制浆工艺产生的废液（黑液）中分离出的固体木质素（例如，粉末状）。它不适用于原料黑液和碱性木质素（从木屑中分离并溶解在硫化钠和氢氧化钠溶液中的木质素，例如源自黑液的木质素）。 [外文原描述]： This document describes a method for the determination of the glass transition temperature ( T g ) of kraft lignin. The procedure utilizes differential scanning calorimetry (DSC). This procedure is applicable to solid lignins (e.g., powdered form) isolated using different isolation techniques (e.g., acidification with hydrochloric acid, sulfuric acid, etc., and carbonation using gaseous carbon dioxide) from the spent liquor (black liquor) generated from the kraft pulping process. It does not apply to raw black liquor and lignin in the alkali form, (lignin that is separated from wood chips and dissolved in sodium sulfide and sodium hydroxide liquor such as that originating from black liquor).