NDLI: Carbon molecular sieve membrane from a microporous spirobisindane-based polyimide precursor with enhanced ethylene/ethane mixed-gas selectivity

Content Provider	Royal Society of Chemistry (RSC)
Author	Pinnau, Ingo Han, Yu Wang, Yingge Salinas, Octavio Ma, Xiaohua
Copyright Year	2017
Abstract	Ethylene is typically produced by steam cracking of various hydrocarbon feedstocks. The gaseous products are then separated in a demethanizer followed by a deethanizer unit and finally sent to a C2 splitter for the final purification step. Cryogenic distillation of ethylene from ethane is the most energy-intensive unit operation process in the chemical industry. Therefore, the development of more energy-efficient processes for ethylene purification is highly desirable. Membrane-based separation has been proposed as an alternative option for replacement or debottlenecking of C2 splitters but current polymer membrane materials exhibit insufficient mixed-gas C2H4/C2H6 selectivity (<7) to be technically and economically attractive. In this work, a highly selective carbon molecular sieve (CMS) membrane derived from a novel spirobisindane-based polyimide of intrinsic microporosity (PIM-6FDA) was developed and characterized. PIM-6FDA showed a single-stage degradation process under an inert nitrogen atmosphere which commenced at ∼480 °C. The CMS formed by pyrolysis at 800 °C had a diffusion/size-sieving-controlled morphology with a mixed-gas (50% C2H4/50% C2H6) ethylene/ethane selectivity of 15.6 at 20 bar feed pressure at 35 °C. The mixed-gas ethylene/ethane selectivity is the highest reported value for CMS-type membranes to date.
Starting Page	3265
Ending Page	3272
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	7
Issue Number	6
Journal	RSC Advances
DOI	10.1039/c6ra24699k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Distillation Chemical industry Polyimide Pyrolysis Hydrocarbon Ethylene CMS Polymer Nitrogen Carbon Molecular sieve Cracking (chemistry) Content management system Unit operation Diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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