Study of purity and recovery of carbon dioxide from binary mixture of natural gas using different adsorbents in pressure equalized pressure swing adsorption
Kesan pemisahan metana (CH4) dan carbon dioksida (CO2) merupakan
campuran binari gas asli telah disiasat dengan ujian penyifatan, kajian proses
penembusan dan penjerapan tekanan buaian (PSA). 2 jenis penjerap dikaji dan
dibandingkan iaitu arang teraktif dan zirkonium-benzenedicarboxylate (UiO-66).
Ujian penyfatan menunjukkan bahawa UiO-66 mempunyai luas permukaan BET yang
lebih tinggi dan arang teraktif mempunyai kandungan karbon tetap yang lebih tinggi.
Untuk kajian proses penembusan, keluk proses penembusan telah diperolehi dalam
keadaan 1 bar dan suhu bilik. Kesan kedua-dua penjerap dan nisbah kemasukan gas
yang berbeza telah disiasat. UiO-66 menunjukkan ia mempunyai kapasiti penjerapan
yang lebih besar dibuktikan dengan masa yang lebih lama dalam kajian proses
penembusan. Di samping itu, proses PSA telah menggunakan penjerapan 2 katil dalam
keadaan 3 bar dan suhu bilik. Walau bagaimanapun, kesan pemisahan campuran ini
tidak berkesan dan tertarik dari segi komersial kerana 2 jenis penjerap yang digunakan
tidak sesuai untuk memisahkan binary gas ini. Oleh itu, ketulenan tidak tercapai tetapi
pemulihan boleh diperolehi kerana UiO-66 menunjukkan lebih daripada 90% ke atas
untuk pemulihan CO2.
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The separation effect of methane (CH4) and carbon dioxide (CO2) which is binary
mixture of natural gas was investigated with characterization tests, breakthrough study
and pressure swing adsorption (PSA) process. 2 types of adsorbent were studied and
compared which were activated charcoal and zirconium-benzenedicarboxylate (UiO-
66). The characterization tests showed that UiO-66 has higher BET surface area and
activated charcoal has higher fixed carbon content. For breakthrough study, the
breakthrough curves were obtained under the condition of 1 bar and room temperature.
The effects of both adsorbents and different inlet gas ratio were investigated. UiO-66
has larger adsorption capacity proven by its longer breakthrough time. Besides, PSA
process had utilized 2-bed adsorption under the conditions of 3 bar and room
temperature. However, separation effect of this mixture was not effective and
commercially attractive because 2 types of adsorbent used were not suitable for
separating this binary gas. Hence, the purity was not achieved but the recovery could
be obtained because UiO-66 showed more than 90% recovery on CO2.
Study of purity and recovery of carbon dioxide from binary mixture of natural gas using different adsorbents in pressure equalized pressure swing adsorption
Study of purity and recovery of carbon dioxide from binary mixture of natural gas using different adsorbents in pressure equalized pressure swing adsorption / Chong Ching Yang