硫酸盐木质素 用热重法测定热稳定性

[中文适用范围]： 本文介绍了使用热重法对牛皮纸木质素进行热分析。热重法可用于确定各种材料（包括常压下的木质素）的初始分解温度、分解速率和最大分解温度。所有这些温度仅基于质量损失，不一定是真正的分解温度，因为并非所有分解都能在常压下产生蒸发。因此，这些值仅用于比较目的。该程序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）从牛皮纸制浆工艺产生的废液（黑液）中分离出的固体木质素（例如，粉末形式）。它不适用于原黑液。热重测量可以在不同类型的气氛下进行，例如惰性气氛或氧化气氛。 [外文原描述]： This document describes the thermal analysis of kraft lignin using thermogravimetric methods. Thermogravimetry can be used to determine the initial decomposition temperature(s), rate(s) of decomposition, and the temperature at maximum decomposition of various materials, including lignins at atmospheric pressure. All these temperatures are solely based on the mass loss and are not necessarily the real decomposition temperatures, because not all decompositions can generate evaporation at atmospheric pressure. Thus, these values are only for comparison purposes. This procedure is applicable to solid lignins (e.g., powdered form) isolated using different isolation techniques (e.g., acidification with hydrochloric acid, sulphuric acid, etc., and carbonation using gaseous carbon dioxide) from the spent liquor (black liquor) generated in the kraft pulping process. It does not apply to raw black liquor. Thermogravimetric measurement may be performed under different types of atmosphere, e.g., an inert atmosphere or an oxidative atmosphere.