I tried first by chemical absorption using NaOH as solvent. Summary of the best performance IL applied as solvents for CO2 separation. Based on this assumption, the maximum CO2 loading using sterically hindered amines is higher than for unhindered, primary or secondary amines. The amine-based chemical absorption process has been used for CO2 and H2S removal—acid gas removal—from gas-treating plants since 1950s [4] and are considered to be by far the most developed CO2 capture process. [53]. Finally, the solvent resistance to be degrade in presence of O2, NOx and SO2 and also under elevated temperature is compared by the solvent losses under specific operating conditions. In particular, the CO2 absorption capacity, namely CO2 loading, is defined as the amount of CO2 that can be absorbed per mole of solvent (mole CO2/mole solvent). After CO2 is absorbed, the CO2 loaded solvent is flashed to release CO2 and recovers its original capacity. Rectisol™ is licensed by Lurgi AG, which is an affiliated company of Air Liquide. Carbon capture and storage (CCS) is one of the pathways for anthropogenic CO2 emission mitigation. As PhD students, we found it difficult to access the research we needed, so we decided to create a new Open Access publisher that levels the playing field for scientists across the world. The Selexol™ process, licensed by Universal Oil Products (UOP), employs a mixture of different dimethyl ethers and polyethylene glycol, represented by the formulae (CH3O(C2H4O)nCH3), with n factor ranging from 3 to 9 [2]. Note that gray balls represent C atoms; white balls represent H atoms; red/dark gray balls represent O atoms; dark blue/black balls represent N atoms [11]. Anthropogenic CO2 emissions are considered the major contributor of greenhouse gas emissions worldwide. Solvent Development for CO 2 Absorption Process Dr. Prachi Singh, IEAGHG R&D Programme, M.Sc. The maximum CO2 absorption capacity can be deducted from the CO2 solubility represented by vapour-liquid equilibrium (VLE) curves of each solvent, depending on the CO2 partial pressure in the bulk gas and the absorption temperature [4]. Finally, physical solvents are adequate in high CO2 partial pressure applications and they are reported in the last section. Furthermore, DGA presents similar properties to MEA in many aspects, except that its low vapor pressure allows its use at higher concentrations, typically between 40 and 60%wt. Chemical Engineering, 2004, University of In comparison with other physical solvents, the Morphysorb solvent co-absorbs fewer heavier hydrocarbons and is also suited for simultaneous water removal from the feed gas [67]. As it was mentioned previously, numerous ILs formulae have been developed for last 20 years. Several sterically hindered amines are shown in Table 2. *Address all correspondence to: fvega1@us.es, Carbon Dioxide Chemistry, Capture and Oil Recovery, Edited by Iyad Karamé, Janah Shaya and Hassan Srour. The process can be operated at 50 bar and either at ambient temperature or with refrigeration down to about −15°C. The physical solvent used (DIPA or MDEA) has a higher absorption capacity and a low energy requirement for regeneration, thus increasing the carrying capacity due to lower solvent recycled requirements. Besides the absence of water in its formulation, the hybrid nature of this type of solvents (physisorbing and chemisorbing) provides a potential improvement in CO2 capture due to the possibilities that its chemical nature offers. Nowadays, researchers are focusing on the development of ILs as a promising CCS approach based on their exceptional properties as a solvent for CO2 capture. Solvent regeneration is a high-intensive energy process. As it was indicated in the introduction section, the high partial pressures of CO2 and low-temperatures are desirable to obtain an optimized performance of the physical absorption process in terms of absorption rates and solubility equilibrium of CO2. The potassium carbonate (K2CO3) is other non-amine-based solvents that can be used as a promoter the CO2 capture with amine-based solvent or other class of amine, like a sterically hindered amine [12]. Other properties such as their low vapor pressure must be also taking into account due to its impact on the environment. These amines are characterized by forming carbamates of intermediate-to-low stability, introducing a bulky substituent adjacent to the amino group to lower the stability of the carbamate formed by CO2-amine reaction.