Showing papers by "Giuseppe Barbieri published in 2022"
TL;DR: In this article , a multistep membrane process was proposed for the upgrading of a mixture containing 60% of methane and 40% of carbon dioxide, considering three case studies that allow to cover a wide range of CO 2 permeability (from 5 to 180 Barrer) and CO 2 /CH 4 selectivity (from 30 to 200).
9 citations
TL;DR: In this article , the performance of cellulose-based carbon hollow fiber membranes was investigated under continuous exposure to a gas stream also containing H2S and/or water vapor, and it was found that the exposure of the membranes to H2V and water vapor (relative humidity of 90%) provoked a reduction of CO2 and CH4 permeability compared to the clean and dry mixed gas, which resulted in an increment of selectivity, which reached a value of more than 200.
7 citations
TL;DR: In this article , a polyetherimide/polyimide (PEI-PI) membrane module with an area of 1500 cm 2 was used to evaluate the mass transport properties and the influence of water vapour and H 2 S on the separation performance.
6 citations
5 citations
01 Dec 2022
1 citations
TL;DR: In this paper , the authors incorporated silver ions as ion complexes in the Pebax®2533 matrix to increase their stability as a function of time, and two complexing agents were evaluated: ammonia and 15-crown-5-ether.
Abstract: ABSTRACT Facilitated transport membranes containing silver ions have attracted much attention thanks to their high performance in olefin/paraffin separation. However, the poor long-term stability of such membranes remains a drawback that must be overcome to enable their practical use. In this work, silver ions were incorporated as ion complexes in the Pebax®2533 matrix to increase their stability as a function of time. Two complexing agents were evaluated: ammonia and 15-crown-5-ether. Membranes of Pebax®2533/Ag(NH3)2OH and Pebax®2533/[Ag(15-crown-5-ether)]BF4 maintained stable selectivity for more than thirty days of observation without compromising permeability. Although complexation decreases the performance of silver compared to free ions, it significantly increases the long-term performance in ethylene/ethane separation. the complexing agents weaken the intensity and strength of Ag+/ethylene-π complexation, but prevent the reduction of Ag(I) to Ag(0). In long-term single gas permeation tests, the Pebax®2533/Ag(NH3)2OH membrane showed selectivity in the range of 12.3 to 9 for 39 days, while the Pebax®2533/[Ag(15crown-5-ether)]BF4 membrane showed selectivity around 9 for 30 days. Mixed gas permeation studies allowed to identify conditions to maintain the separation performance above the upper bound for more than 40 days, under continuous membranes exposure to mixed gases. Increased stability compared to membranes reported in the literature was achieved.
TL;DR: In this article , the authors analyzed the permeability of binary and ternary H2-containing mixtures through a SAPO-34 membrane, aiming at investigating how hydrogen influences and its permeation is influenced by the presence of the other gaseous species, such as CO2 and CH4.