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Related Concept Videos

Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered ethane, the...
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
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Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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Enhancing Ethane/Ethylene Separation Performance in Two Dynamic MOFs by Regulating Temperature-Controlled Structural

Yi Li1, Yabo Xie1, Xin Zhang1

  • 1Beijing Key Laboratory for Green Catalysis and Separation and Department of Environmental Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.

Inorganic Chemistry
|December 19, 2022
PubMed
Summary
This summary is machine-generated.

Two dynamic metal-organic frameworks, BUT-111 and BUT-112, enable efficient purification of ethylene from ethane. These materials exhibit ultramicropores and reversed adsorption behavior, achieving high-purity ethylene in a single step.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Ethane/ethylene separation is crucial in the chemical industry due to similar properties.
  • Effective adsorbents require precise pore apertures for C2H6/C2H4 separation.

Purpose of the Study:

  • To develop novel adsorbents for efficient C2H4 purification from C2H6/C2H4 mixtures.
  • To investigate the impact of framework interpenetration on adsorption performance.

Main Methods:

  • Synthesis of two dynamic pillar-layered metal-organic frameworks (MOFs): BUT-111 and BUT-112.
  • Characterization of their isomorphic frameworks and varying degrees of interpenetration.
  • Evaluation of their adsorption behavior for C2H6/C2H4 separation under different temperatures.

Main Results:

  • BUT-111 and BUT-112 exhibit dynamic behavior, forming ultramicropores upon activation.
  • Both MOFs demonstrate reversed adsorption order for C2H6 and C2H4, enabling one-step C2H4 purification.
  • Selectivity increases with decreasing temperature; enhanced interpenetration in BUT-112 improves purification.

Conclusions:

  • Dynamic pillar-layered MOFs offer a promising strategy for challenging C2H6/C2H4 separations.
  • Tunable interpenetration is key to optimizing MOF performance for C2H4 purification.
  • BUT-111 and BUT-112 show potential for industrial application in C2H4 purification across a wide temperature range.