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The Changing Paradigm in Sour Gas Treating Processes

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The Changing Paradigm in Sour Gas Treating Processes Recent Advances in Petrochemical Science ISSN: 2575-8578 Mini Review Recent Adv Petrochem Sci Volume 3 Issue 2 -september 2017 Copyright © All rights are reserved by Madhusree Kundu DOI: 10.19080/RAPSCI.2017.03.555608 The Changing Paradigm in Sour Gas Treating Processes Madhusree Kundu* Department of Chemical Engineering, National Institute of Technology, India Submission: September 18, 2017; Published: September 22, 2017 *Corresponding author: Madhusree Kundu, Department of Chemical Engineering, National Institute of Technology, Rourkela, Orissa, India, Email: Mini Review hybrid solvents are in use for gas treating. Among the different technologies available for CO mitigation, capture of CO by (H S), carbon dioxide (CO 2 2 2 The sour gas treating2 is the removal of hydrogen sulfide chemical absorption is the technology that is closest to get ), and organo sulfides from gases. It implemented commercially. The technology was patented in petrochemical plants, natural gas processing plants, and is a common unit process used in refineries, and is also used other industries. Currently, removal of carbon dioxide from for natural gas sweetening as early as 1930 by R.R. Bottoms commercially available and used in early gas-treating plants. as well, which generically is different from natural gas and [2]. Triethanolamine (TEA) was the first alkanolamine thermal power plant flue gas seems to be a great challenge In the present context, the role of alkanolamine solvents in sour gas treating research should be revered. Chemical technologies and their changing spectrum in sour gas treating, refinery off gas treating technology. Before chronicling the absorption processes for gas treating may be divided into the author would like to have a brief opportunity to discuss three conceptual categories distinguished by the rate at which simply the plight of non-treating of sour gas. The CO enriched 2 the solvent reacts with CO gas is having greenhouse effect and global warming potential, 2 termed “bulk” CO treating processes, and are well-known by 2 . The first group of processes can be their ability to remove CO to very low levels. Aqueous primary downstream processing, untreated gas incurs the reduction in 2 untreated hydrogen sulfide may corrode the pipelines in or secondary alkanolamines and promoted hot carbonate salts 2 are prominent solvents in this category. Though the reaction should be removed to avoid freezing in the low temperature fuel value of the gas. In LNG (liquefied natural gas) plants, CO of CO with these alkanolamines is fast, it is accompanied by a chillers. Moreover, in the manufacture of ammonia, it would 2 highly exothermic heat of reaction [2], which must be supplied poison the catalyst. The drastic change in climate has triggered in the regenerator to regenerate the solvent. Consequently, an imbalance in ecology, socio-economic structure, energy these processes can be energy intensive [1]. The second group security and sustainable development. CO2 emission, being one of processes employing tertiary or hindered alkanolamines to of the exponential components behind this changing climate avoid the faster carbamate formation reaction represents the and that has challenged the environmental poise. Carbon second group of “selective” treating processes. These selective dioxide (CO ) capture and sequestration or utilization (CCS/ 2 processes are capable of removing as much as 90% of the CO2 CCU) has taken the centre stage globally due to the increasing in the feed gas while removing H2S to very low levels (less than adversaries of CO emissions. 2 4ppm) [2]. The tertiary alkanolamine MDEA can be regarded Among the most widely practiced gas treating processes, as a selective treating agent. A third category of processes absorption into physical solvents or chemical solvents, and hybrid solvents (blends of chemical and physical solvents) sterically hindered alkanolamines (2-amino-2- methyl-1- is selective treating category. Blended alkanolamines and have been the major ones [1,2]. Propylene carbonate (in Flour propanol (AMP), 2-amino-2-(hydroxymethyl)-1, 3-propanediol process), Dimethyl ether of Polyethylene Glycol (in Selexol (AHPD)) are suitable candidates of this category, which process), N-methyl-2-pyrolidone (in Purisol Process), Chilled reduces the regeneration energy requirement for the re- methanol (in Rectisol process) are the physical solvents circulating solvents. Solvent loss, high capital investment used for has treating. DIPA-sulfolane-water (40-40-20 wt %) for absorbers and strippers, high regeneration energy requirement of alkanolamines have necessitated still better solvent formulation suitable for large scale industrial process under the trade name Sulfinol D, MDEA-sulfolane-water (40- applications. 40-20 wt %) under the trade name Sulfinol M and many more Recent Adv Petrochem Sci 3(2): RAPSCI.MS.ID.555608 (2017) 0028 Recent Advances in Petrochemical Science Gas treating research has witnessed several transitions. dynamically operated packed beds. An extensive R&D effort Room temperature ionic liquids (RTL’s) and their mixtures has been envisioned towards conversion of CO2 to hydrocarbon with alkanolamines, alkali metal salts of a number of tertiary by chemical, and biochemical routes, possibly it is one of the amino acids promoted with reactive amines such as MEA strategic routes leading to our future survival in this planet. have been used in CO2 absorption. Some solvents have been proposed with multiple amine functionalities and among References them, Piperazine (PZ) has been used as a promoter specially 1. solvents. John Wiley and Sons, New York, USA. Astarita G, Savage DW, Bisio A (1983) Gas treating with chemical th structure and spatial arrangement of the attached functional 2. edn), Gulf Publishing in treating coal based power plant flue gas [3]. The molecular Company, Houston, USA. groups in alkanolamines may be crucial in CO2 absorption Kohl AL, Nielsen RB (1997) Gas Purification (5 [4,5]. Apart from absorption, adsorption (Solid Surface), and 3. piperazine / methyldiethanolamine. AIChE Journal 48(12): 2788-2799. physical separation (membrane, cryogenic Separation) process Bishnoi S, Rochelle GT (2002) Absorption of carbon dioxide in aqueous have been used in sour gas treating. Paul et al. [6] have studied 4. Chowdhury FA, Yamada H, Higashii T, Goto K, Onoda M, et al. (2013) CO2 capture by tertiary amine absorbents: a performance comparison theoretically the absorption of carbon dioxide in different study. Ind Eng Chem Research 52(24): 8323-8331. 5. Adak S, Kundu M (2017) Vapor-liquid equilibrium and physicochemical membrane contactor (FSMC). Wang et al. [7] have studied the properties of novel aqueous blends of (2-Diethylaminoethanol + single and blended alkanolamine solvents using flat sheet Piperazine) for CO appropriation. Journal of Chemical absorption of CO2 into water using parallel-plate gas–liquid 2 & Engineering membrane contactor. The largest membrane based natural gas Data 62(7): 937-1947. processing plant in the world is located at Qadirpur, Pakistan 6. Theoretical studies on separation (Dortmundt, UOP, 1999). Process integrated membrane and sheetPaul S, membraneGhoshal AK, contactor Mandal B (2008)(FSMC). Chemical Engineering Journal absorption unit are advantageous because of reduced size of 144(of CO23): by352-360. single and blended aqueous alkanolamine solvents in flat membrane gas liquid contactors and weight, wide range of 7. Wang R, Li DF, Liang DT (2004) Modelling of CO2 capture by three membranes are integrated with the stripping unit), reduction Eng Proces 43(7): 849-856. liquid and gas flows, lower capital costs, reduction in energy (if typical amine solutions in hollow fiber membrane contactors. Chem 8. Chowdhury P, Mekala S, Dreisbach F, Gumma S (2012) Adsorption of The fascinating facts could not be transformed in to a full CO, CO2 in solvent losses, no entrainment, flooding or channeling. Effect of Open Metal Sites and Adsorbate Polarity. Microporous and 2 capture technology at large Mesoporous and MaterialsCH4 on Cu-BTC 152(1): and 246-252. MIL-101 Metal Organic Frameworks: flagged, commercially viable CO systems not economically viable (yet), thermal stability of 9. Mishra P, Mekala S, Dreisbach F, Mandal Gumma S (2012) Adsorption scales. The real issues are low selectivity & flux - large scale of CO , CO, CH and N on a zinc based metal organic framework. polymer membranes, degradation & lifetime of membrane, and 2 4 2 B, immature technology. 10. SeparationMason JA, andSumida Purification K, Herm Technology ZR, Krishna 94: R,124-130. Long JR, et al. (2011) Commonly used adsorption processes are; the iron oxide, Evaluating metal-organic frameworks for post-combustion carbon zinc oxide, MOFs and molecular sieve (zeolite) process. In dioxide capture via temperature swing adsorption. Energy and Environmental Science 8: 3030-3040. recent years, there has been considerable research on the use of zeolites, metal organic frameworks (MOFs), and zeolitic 11. of zeolites for separation of CO2/CH4 mixtures. Chemical Engineering imidazolate frameworks (ZIFs) for selective adsorption of CO2 JournalKrishna 133(1-3): R, Baten JM 121-131. (2007) Using molecular simulations for screening from CO /H , CO /CH4 and CO /N mixtures [8-13]. 2 2 2 2 2 12. Krishna R, (2011) Investigating the potential of MgMOF-74 A promising novel option is to freeze out (desublimate) membranes for CO2 capture. Journal of Membrane Science 377(1-2): 249-260. Baten JM High cooling costs could be minimized by exploiting
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