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Pre-combustion gas separation by ZIF-8-polybenzimidazole mixed matrix membranes in the form of hollow fibres-long-term experimental study.

ABSTRACT: Polybenzimidazole (PBI) is a promising and suitable membrane polymer for the separation of the H₂/CO₂ pre-combustion gas mixture due to its high performance in terms of chemical and thermal stability and intrinsic H₂/CO₂ selectivity. However, there is a lack of long-term separation studies with this polymer, particularly when it is conformed as hollow fibre membrane. This work reports the continuous measurement of the H₂/CO₂ separation properties of PBI hollow fibres, prepared as mixed matrix membranes with metal-organic framework (MOF) ZIF-8 as filler. To enhance the scope of the experimental approach, ZIF-8 was synthesized from the transformation of ZIF-L upon up-scaling the MOF synthesis into a 1 kg batch. The effects of membrane healing with poly(dimethylsiloxane), to avoid cracks and non-selective gaps, and operation conditions (use of sweep gas or not) were also examined at 200°C during approximately 51 days. In these conditions, for all the membrane samples studied, the H₂ permeance was in the 22-47 GPU range corresponding to 22-32 H₂/CO₂ selectivity values. Finally, this work continues our previous report on this type of application (Etxeberria-Benavides et al. 2020 Sep. Purif. Technol. 237, 116347 (doi:10.1016/j.seppur.2019.116347)) with important novelties dealing with the use of ZIF-8 for the mixed matrix membrane coming from a green methodology, the long-term gas separation testing for more than 50 days and the study on the membrane operation under more realistic conditions (e.g. without the use of sweep gas).

SUBMITTER: Perea-Cachero A

PROVIDER: S-EPMC8437021 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Efficient Separation of Acetylene-Containing Mixtures Using ZIF-8 Membranes.

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Relationship between Ethane and Ethylene Diffusion inside ZIF-11 Crystals Confined in Polymers to Form Mixed-Matrix Membranes.

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| S-EPMC7449132 | biostudies-literature

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