Ma Mengyu, Zhao Hongge, Hu Peng
School of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, P. R. China.
ACS Omega. 2024 Mar 7;9(11):12779-12788. doi: 10.1021/acsomega.3c08575. eCollection 2024 Mar 19.
The paper introduced hydrophilic functional groups on the surface of the MgO desulfurizer to improve its dispersion and hydrophilicity on the basis of reducing the particle size of the MgO desulfurizer to the nanometer level. Mechanical grinding technology was used to improve the traditional two-step method to lay the foundation for its large-scale production. The stability test showed that the ζ potential of the 5 wt % modified MgO desulfurizer was greater than 50 mV with 30 days of storage, and the sedimentation rate was not more than 7%. The dissolution reactivity and kinetics experiments showed that the decrease of particle size and the increase of hydrophilicity and dispersion were conducive to accelerating the dissolution rate of the MgO desulfurizer and reducing the apparent activation energy. Meanwhile, the good dissolution rate of the modified MgO nanofluids prepared by the improved method could reduce the liquid film mass transfer resistance and prolonged the penetration time.
该论文在将氧化镁脱硫剂粒径减小至纳米级的基础上,在其表面引入亲水性官能团,以提高其分散性和亲水性。采用机械研磨技术改进传统两步法,为其大规模生产奠定基础。稳定性测试表明,5 wt%改性氧化镁脱硫剂在储存30天时ζ电位大于50 mV,沉降率不超过7%。溶解反应性和动力学实验表明,粒径减小、亲水性和分散性增加有利于加快氧化镁脱硫剂的溶解速率并降低表观活化能。同时,改进方法制备的改性氧化镁纳米流体良好的溶解速率可降低液膜传质阻力并延长渗透时间。