PSA Technology for H2 Separation

Hydrogen Recovery from Coke Oven Gas. Comparative Analysis of Technical Alternatives

“…Molecular sieves such as zeolites are used to remove nitrogen and carbon monoxide, which are the most concerning contaminants . Nevertheless, alumina (AA) and activated carbon (AC) layers must be placed before the molecular sieve to remove water vapor, methane, and carbon dioxide since their strong interaction with zeolites leads to high energy consumption in the desorption stage. , Figure shows a schematic representation of the PSA separation technology.…”

Review of Polybed pressure swing adsorption for hydrogen purification

“…Adsorbent poisoning is also very rare since syngas streams do not contain volatile organic compounds (VOCs) or high molecular weight hydrocarbons while hydrogen sulphide (H2S) concentration is in the range of 5 10 and 40 60 ppmv for natural gas-and coal-based feedstock, respectively (DOE, 2002;IEA, 2017). As a result, the adsorbents of industrial PSA units can last more than 10 years without replacement (Wiessner, 1988;Dobladez et al, 2021;Xebec, 2021) and up to 30 years for hydrogen purification applications (Grande, 2016;UOP, 2016;Air Products, 2018b).…”

“…Historically, steam reforming of light hydrocarbons, such as natural gas, LPG and light naphtha, has been the dominant technology for the production of syngas, and, hence, of hydrogen. Although the syngas has hydrogen as its major component, it also contains CO, CO2, some unreacted CH4, and other minor impurities such as N2, O2, Ar, H2S, NH3, etc., the presence of which depends on the feedstock and operating conditions (Grande, 2016). Since the 1980s Polybed PSA systems have been applied to the H2-rich streams to purify hydrogen in order to meet the stringent purity requirements of the processes where hydrogen is used as feedstock.…”

Separation Performance of Si-CHA Zeolite Membrane for a Binary H2/CH4 Mixture and Ternary and Quaternary Mixtures Containing Impurities

“…Hydrogen can be further purified from methane by pressure swing adsorption, low temperature distillation, and membrane separation . Membrane separation has the advantages of high separation efficiency, low energy consumption, and continuous operation compared with other two methods, and it is promising for molecular separations − including hydrogen purification. ,, …”

“…4 Membrane separation has the advantages of high separation efficiency, low energy consumption, and continuous operation compared with other two methods, and it is promising for molecular separations 5−9 including hydrogen purification. 5,6,9 Crystalline zeolite and metal organic framework (MOF) membranes can separate molecules with high flux and high selectivity by molecular sieving and preferential adsorption mechanisms. Huang et al 10 developed a new type of twolayered ZIF-8@GO membrane with a H 2 /CH 4 separation factor of 139.1 and H 2 permeance of 1.3 × 10 −7 mol/(m 2 s Pa) at 523 K. Caro et al 11 prepared a high c-oriented NH 2 -MIL-125 MOF film on porous α-alumina substrate; the membrane showed a H 2 /CH 4 ideal selectivity of 11.2 and H 2 permeance of 4.375 × 10 −8 mol/(m 2 s Pa) at 298 K and 0.1 MPa.…”