CSA ISO 22207:26

CSA Preface This is the first edition of CSA ISO 22207, Kraft lignin — Determination of thermal stability by thermogravimetry , which is an adoption without modification of the identically titled ISO (International Organization for Standardization) Standard 22207 (first edition, 2024-09). It replaces CSA W207:20, Kraft lignin — Determination of thermal stability by thermogravimetry. For brevity, this Standard will be referred to as "CSA ISO 22207" throughout. This Standard was reviewed for Canadian adoption by the CSA Technical Committee on Lignin, under the jurisdiction of the CSA Strategic Steering Committee on Natural Resources, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 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.