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Zakeri Fatemeh,Vosoughi Mahsa,Maghsoudi Hafez,Denayer Joeri F. M. 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.4
Microporous titanosilicate ETS-4 zeotype membrane, with its 4 Å pore openings, is an adequate material for the kinetic separation of nitrogen from methane. Obtaining high N 2 /CH 4 permselectivity, small-sized ETS-4 powder was synthesized by aging method, and then utilized as membrane seeding powder. Highly N 2 -selective ETS-4 membranes were fabricated utilizing a new recipe and the secondary growth approach on α-alumina supports. XRD, FESEM, and EDX studies were used to analyze the synthesized ETS-4 powder and membranes. The eff ect of membrane activation temperature (80–140 °C) on permeance of N 2 was evaluated. In addition to N 2 and CH 4 , the membrane permeance was also evaluated for O 2 and Ar gases. Regarding the ETS-4 membranes, N 2 permeance increased gradually as the activation temperature was raised in the 80–140 °C range, reaching its highest value (i.e., 2.6 × 10 −8 mol m −2 s −1 Pa −1 ) after activation at 140 °C. The permeances of N 2 and CH 4 gases were measured at 30, 50, and 70 °C, and a pressure diff erence up to 600 kPa. N 2 /CH 4 permselectivity of 75.19 (N 2 permeance of 1.94 × 10 –8 mol m- 2 s −1 Pa −1 ) were obtained at 30 °C and 200 kPa of feed pressure. The results revealed that ETS-4 membranes have great potential for N 2 removal from natural gas due to highest N 2 /CH 4 permselectivity among the other membranes.