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Utilizing Caleva Extrusion-Spheronization Equipment – Congratulations to Zhejiang University Chemical Engineering Team on Research Published in Nature Communications
Pubdate：2026-08-04 Click：36
Research Brief
Warm congratulations to the chemical engineering research team of Zhejiang University! Their research on low-cost robust MOF composite adsorbents for high-efficiency separation of SF₆/N₂ mixtures has been published in Nature Communications. This study addresses the critical bottleneck hindering industrial deployment of MOF powders. The mechanized fabrication of spherical composite pellets relies entirely on the integrated extrusion-spheronization unit manufactured by Caleva (UK). The precision instrument delivers robust hardware support for all lab-scale experiments and industrial engineering validation.
1. Research Background
Sulfur hexafluoride (SF₆) is an extremely potent greenhouse gas, yet it remains an irreplaceable insulating medium for high-voltage power equipment. Industrial operations require recovery of low-concentration SF₆ from SF₆/N₂ exhaust mixtures, with strict dual standards mandating ≥99.9% SF₆ recovery rate and ≥99.9% product purity. Conventional cryogenic distillation suffers from excessive energy consumption. Unprocessed bare MOF powders bring severe drawbacks including severe bed pressure drop, dust emission and pipeline clogging, making pelletization a mandatory step for industrial application.
2. Caleva Extrusion-Spheronizer: Enabling Industrial Shaping of MOF Materials
The industrially applicable Al(fum)@5%Kaolin spherical pellets described in the paper are fully manufactured via mechanized processing on Caleva extrusion-spheronization equipment. Key advantages of the instrument are summarized below:
1. Integrated extrusion and spheronization modules, enabling controllable production of uniform spherical pellets ranging from 0.8 to 1.2 mm in diameter;
2. Minimal attenuation of MOF pore architecture during shaping; the composite pellets retain nearly identical BET specific surface area and SF₆ adsorption capacity as pristine MOF powder;
3. Enhanced mechanical compressive strength superior to commercial zeolite 13X, drastically mitigating bed pressure drop and eliminating dust generation and pipeline blockage;
4. Excellent experimental repeatability with linear scale-up compatibility of lab-scale formulation parameters, laying a solid foundation for simulation and verification of continuous vacuum temperature swing adsorption (VTSA) processes. (Diagram: Material Synthesis & Extrusion-Spheronization Flowchart)
3. Core Research Achievements
1. Green aqueous synthesis route for low-cost Al(fum) MOF adsorbent. Its precisely tailored pore dimension and positively electrostatic potential pore walls enable ultra-high SF₆/N₂ IAST selectivity exceeding 34,000;
2. Al(fum)@5%Kaolin pellets fabricated by Caleva equipment deliver a dynamic SF₆ adsorption capacity of 2.74 mmol g⁻¹, with no observable performance decay over 1,000 adsorption-desorption regeneration cycles;
3. An innovative two-stage VTSA continuous separation process is proposed, achieving simultaneous SF₆ recovery and product purity of 99.91%. The total energy consumption accounts for merely 18.7% of traditional cryogenic distillation;
4. Comprehensive characterization combining in-situ FTIR, 2D solid-state NMR and DFT-D molecular simulations elucidates the intrinsic multi-site adsorption and rapid diffusion mechanism of SF₆within Al(fum) pore channels.
(Diagram: Two-Stage VTSA Process Schematic)
4. Concluding Remarks
Nature Communications imposes rigorous evaluation standards for experimental reproducibility and industrial practicability. The standardized, repeatable pelletization workflow delivered by Caleva extrusion-spheronization equipment guarantees consistent, verifiable experimental datasets, serving as an indispensable hardware pillar for this high-impact publication. We once again congratulate the Zhejiang University chemical engineering team on this landmark breakthrough in carbon neutralization technology. We anticipate more researchers to leverage Caleva extrusion-spheronization systems to accelerate the translation of porous adsorbent materials from laboratory synthesis to industrial implementation.
Caleva’s state-of-the-art MLS integrated wet granulation, extrusion and spheronization benchtop system features an intuitive digital touchscreen and programmable recipe management software to streamline formulation development workflows. Equipped with microscopic imaging and automatic data logging functions, the MLS platform facilitates parallel R&D trials within a single workday while securing exceptional experimental reproducibility via automated data acquisition.
For further information about Caleva extrusion-spheronization instruments, please contact us for technical brochures and quotation!