Experimental study of removing trace H₂S using solvent coated adsorbent for PSA

Hydrogen Sulfide Capture: From Absorption in Polar Liquids to Oxide, Zeolite, and Metal–Organic Framework Adsorbents and Membranes

“…There is no clear explanation for this sudden rise in adsorption, except that small selective pores that are otherwise unexposed to TEA may get filled with TEA at a higher loading of 27.5 wt%. In a subsequent study, the authors used this system for studying a multi-cycle pressure swing adsorption setup . In a follow-up work, the authors synthesized SBA-15 as a high specific surface area TEA carrier and reported that the amount of H 2 S adsorbed on the TEA-modified SBA-15 is 1.85 times more than that on the TEA-modified silica gel .…”

“…In a subsequent study, the authors used this system for studying a multi-cycle pressure swing adsorption setup. 294 In a follow-up work, the authors synthesized SBA-15 as a high specific surface area TEA carrier and reported that the amount of H 2 S adsorbed on the TEAmodified SBA-15 is 1.85 times more than that on the TEAmodified silica gel. 295 Xue and Liu tried another tertiary amine, methyl-diethyl-amine, loaded on SBA-15, and found an optimal amine loading of 60 wt% for an H 2 S breakthrough capacity of 0.1 mmol/g.…”

Energy optimization of bioethanol production via gasification of switchgrass

“…40 However, the H 2 S does not adsorb as it requires special coating. 41 The third process consists of the use of a membrane that is porous to CO 2 . This alternative does not eliminate H 2 S. It requires high pressure and the MEA that is used as a carrier for the CO 2 permeated though the membrane 42 has to be regenerated requiring a large amount of energy.…”

“…The second alternative is the use of a PSA system using a bed of Zeolite 5A capable of removing CO 2 from the stream 38 . However, the H 2 S does not adsorb as it requires special coating 39 . The third process consists of the use of a membrane that is porous to CO 2 .…”

Study on Sorption Behaviors of H2S by Triethanolamine-Modified Mesoporous Molecular Sieve SBA-15

“…However, the methods currently used to remove H 2 S do not meet the required H 2 S low content. − Generally, purification based on the adsorption principle has low separation cost, and the selection of an adsorbent is a crucial factor in this process . The authors have previously reported that triethanolamine (TEA)-modified silica gel could enhance H 2 S sorption capacity and possibly allow regeneration at ambient temperature. , However, the H 2 S sorption capacity is still at a low level because the specific surface area of silica gel used is relatively low. To understand further the H 2 S transport process from the gas stream to the surface of TEA-modified adsorbent and to improve H 2 S sorption capacity, a mesoporous molecular sieve SBA-15 with a high specific surface area is synthesized as a TEA carrier.…”