4 years ago

New carbon molecular sieves for propylene/propane separation with high working capacity and separation factor

New carbon molecular sieves for propylene/propane separation with high working capacity and separation factor
The effects of the precursor composition and pyrolysis conditions on the properties of the polyvinylidene chloride copolymer (PVDC) derived carbon materials were systematically investigated. A set of eighteen carbon molecular sieve (CMS) adsorbents, chosen using design of experiment (DOE) methodology, was synthesized by direct pyrolysis of PVDC copolymer beads. High throughput transient adsorption measurements were conducted on the eighteen CMS adsorbents using ten probe gas molecules with kinetic diameters ranging from 3.3 to 6.2 Å. Results revealed that the effective micropore size of the resultant CMS adsorbents was controlled by two factors; pyrolysis temperature and precursor crystallinity, which was in turn controlled by comonomer type and content. The effective micropore sizes of these CMS adsorbents were in the range of 4.0–6.2 Å. For propylene/propane separations, one material from this study (CMS-18) gave a substantial improvement in performance over two commercial materials (MSC-4K and zeolite 4A), as determined by separation factor, propylene capacity, and working capacity. Relative to MSC-4K, the new CMS-18 material has 8.5 times higher C3H6/C3H8 separation factor, 1.5 times propylene capacity, and 2.3 times working capacity. Relative to zeolite 4A, the new CMS-18 material gave 1.5 times propylene capacity, and 16.7 times working capacity.

Publisher URL: www.sciencedirect.com/science

DOI: S0008622317307509

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.