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A Novel Polymeric Adsorbent Embedded with Phase Change Materials (PCMs) Microcapsules: Synthesis and Application.
Xingang Li1,2,3, Lingyu Sun4,5, Hong Sui6,7,8
1School of Chemical Engineering and Technology, Tianjin University, 92 Weijin Road, Tianjin 300072, China. lxg@tju.edu.cn.
Nanomaterials (Basel, Switzerland)
|May 16, 2019
Summary
This study introduces novel microcapsule-embedded polymeric adsorbents for controlling heat during volatile organic compound (VOC) adsorption, significantly reducing fire risks in industrial settings.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Industrial gas adsorption processes, such as volatile organic compound (VOC) removal, generate heat.
- This exothermic heat release poses fire and explosion risks within adsorption columns.
- Current adsorbents like activated carbon may not adequately mitigate these thermal hazards.
Purpose of the Study:
- To develop a novel adsorbent material capable of adsorbing VOCs while simultaneously managing the heat generated during adsorption.
- To enhance the safety of industrial adsorption processes by mitigating thermal runaway risks.
- To synthesize and characterize a microcapsule-embedded polymeric adsorbent with integrated thermal regulation capabilities.
Main Methods:
- Synthesis of a highly-porous Vinylbenzyl chloride-Divinylbenzene (VBC-DVB) polymeric adsorbent.
- Embedding microcapsules with a polydivinylbenzene-phase change material (DVB-PCM) core-shell structure, using paraffin wax as the phase change material (PCM).
- Characterization of the adsorbent's properties, including specific surface area, pore structure (micropore-dominant), and thermal properties (Differential Scanning Calorimetry - DSC).
- Laboratory-scale dynamic adsorption tests to evaluate VOC adsorption capacity and temperature control performance.
Main Results:
- The synthesized Hypercrosslinked VBC-DVB Beads (HVPM) adsorbent exhibits a high specific surface area (~665 m²/g) and a micropore-dominant structure.
- The embedded DVB-PCM microcapsules demonstrate heat storage capability, with paraffin wax showing a heat of fusion of 11.1 J/g between 35.0 and 48.2 °C.
- HVPM effectively adsorbed VOCs (toluene, 0.21 g/g) and significantly controlled temperature rise during dynamic adsorption, reducing it by 62.5% compared to controls.
- The material demonstrates potential for safe and efficient industrial gas adsorption.
Conclusions:
- The novel microcapsule-embedded polymeric adsorbent (HVPM) effectively adsorbs VOCs while managing process heat.
- The integrated phase change material (PCM) microcapsules provide passive thermal regulation, enhancing adsorption column safety.
- This material offers a promising solution for mitigating fire and explosion risks in industrial adsorption applications.
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