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Related Concept Videos

Mass Spectrometry: Branched Alkane Fragmentation01:29

Mass Spectrometry: Branched Alkane Fragmentation

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This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
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Recent Progress in a Membrane-Based Technique for Propylene/Propane Separation.

Meng Guo1, Masakoto Kanezashi2

  • 1Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.

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|April 30, 2021
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Summary

Separating propylene and propane is difficult due to their similar properties. Organosilica membranes offer a promising, energy-efficient alternative to traditional methods for this crucial industrial process.

Keywords:
affinity controlhybrid membraneinorganic membraneorganosilica membranepolymeric membranepore size controlpropylene/propane separation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Propylene/propane separation is challenging due to similar molecular properties.
  • Conventional cryogenic distillation is energy-intensive.
  • Membrane separation offers a low-cost, low-energy alternative.

Purpose of the Study:

  • To review recent advancements in propylene/propane separation using various membrane types.
  • To specifically examine the potential of organosilica membranes.
  • To highlight the role of the pore subnano-environment in organosilica membranes.

Main Methods:

  • Comprehensive literature review of polymeric, inorganic, and hybrid membranes for gas separation.
  • Focused analysis on organosilica membranes, including their structure-property relationships.
  • Discussion of pore structure and its impact on separation performance.

Main Results:

  • Organosilica membranes exhibit excellent molecular sieving and hydrothermal stability.
  • The subnano-environment within organosilica pores is critical for selective propylene/propane separation.
  • Recent progress shows significant improvements in membrane performance.

Conclusions:

  • Organosilica membranes are highly promising for efficient propylene/propane separation.
  • Further research into controlling the pore subnano-environment can optimize performance.
  • Membrane technology presents a viable alternative to cryogenic distillation.