Standards Development

Scope

This document provides definitions, guidelines and supportive information for the key performance parameters and their characterization methods of absorption liquids used in post-combustion CO2 capture. It covers common methodologies to measure and calculate specific key performance parameters of the absorption liquids.The absorption liquids for post-combustion CO2 capture covered by this document are chemically reactive liquids, such as amine solutions, potassium carbonate solutions, aqueous ammonia, amino-acid salt solutions, and mixtures of these reactants. Other absorption liquids based on different principles for CO2 capture are not covered.The key performance parameters considered in this standard relate to the design and operation of absorption liquid-based post-combustion CO2 capture process, as well as equipment such as absorber and desorber columns, reboilers, and other heat exchangers.The key performance parameters are as follows:a) Primary parameters, such as rich/lean CO2 loading, absorbent concentration, absorption capacity, heat of absorption, absorption rate, and absorbent volatility.b) Secondary parameters, such as the cyclic loading, are directly derived from the primary parameters, or combined with other physical measurements, as is the case for the absorbent loss rate.In addition, physical and chemical properties such as density, viscosity, pH, thermal conductivity, and specific heat capacity are described. These properties are essential for understanding key performance parameters of the absorption liquids.The following items are included in this document:a) Definitions of key performance parameters (Clause 4) – specifies the set of key performance parameters and physical and chemical properties to be determined, and their calculation methods, to provide a common way of reporting them.b) General for the absorption liquid characterization (Clause 5) – specifies the definition of laboratory measurement and field testing, and provides general requirements for characterization methods for laboratory measurement and field testingc) Instrument and characterization methods (Clause 6) – presents requirements for the instrumentation to be installed or used, and provides guidelines for the characterization methods.d) Technical information (Annexes) – provides measurement methods of absorption liquids, describing all stages of test preparation, set-up and conduct. Additionally, information on sampling absorption liquids is introduced.It is noted that key performance parameters of absorption liquids are important process indicators for post-combustion CO2 capture. However, factors such as process design, equipment design and manufacturing, economics, and safety are also considered for a comprehensive evaluation of post-combustion CO2 capture technology.The document does not provide guidelines for benchmarking or comparing absorption liquids for post-combustion capture processes, nor does it offer methods to assessing different technologies or projects, or specify methodologies for process engineering design. Additionally, the document does not intend to compel technology owners to disclose any intellectual properties related to their proprietary absorption liquids.The document may not cover all available and emerging characterization methods for the key performance parameters considered in this document.