华南理工大学学报(自然科学版) ›› 2023, Vol. 51 ›› Issue (3): 74-82.doi: 10.12141/j.issn.1000-565X.220118

所属专题: 2023年化学化工

• 化学化工 • 上一篇    下一篇

13X分子筛对低质量浓度C3F8的吸附性能分析

袁文辉1 叶招春1 李莉朱峰3   

  1. 1.华南理工大学 化学与化工学院,广东 广州 510640
    2.华南理工大学 环境与能源学院,广东 广州 510006
    3.安徽新力电业科技咨询有限责任公司,安徽 合肥 230601
  • 收稿日期:2022-03-14 出版日期:2023-03-25 发布日期:2022-05-13
  • 通信作者: 袁文辉(1969-),男,博士,教授,主要从事化工吸附分离研究。 E-mail:cewhyuan@scut.edu.cn
  • 作者简介:袁文辉(1969-),男,博士,教授,主要从事化工吸附分离研究。
  • 基金资助:
    国家自然科学基金资助项目(22075089)

Analysis of Adsorption Performance of 13X Molecular Sieve for Low Concentration C3F8

YUAN Wenhui1 YE Zhaochun1 LI Li2 ZHU Feng3   

  1. 1.School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
    2.School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China
    3.Anhui XinLi Electric Technology Consulting Co. , Ltd. , Hefei 230601, Anhui, China
  • Received:2022-03-14 Online:2023-03-25 Published:2022-05-13
  • Contact: 袁文辉(1969-),男,博士,教授,主要从事化工吸附分离研究。 E-mail:cewhyuan@scut.edu.cn
  • About author:袁文辉(1969-),男,博士,教授,主要从事化工吸附分离研究。
  • Supported by:
    the National Natural Science Foundation of China(22075089)

摘要:

电子工业中八氟丙烷(C3F8)的存在会影响六氟化硫(SF6)气体的灭弧和绝缘性能,需要对C3F8进行分离,而目前深冷分离法无法将低浓度C3F8除尽,运用吸附分离法进行C3F8吸附的研究报道也还较少。文中采用已经商用的13X分子筛对低浓度C3F8进行吸附,模拟工业上的固定床吸附实验,测量电气行业中的C3F8在13X分子筛上的动态吸附性能,并研究了商用13X分子筛对低浓度C3F8(ppm级)的吸附透过曲线随进气流量、进气C3F8质量浓度和吸附温度的变化规律,分析各因素的影响程度。绘制C3F8吸附透过曲线,通过吸附透过曲线进行吸附平衡模型预测和动力学模型的拟合,分析了13X分子筛对低浓度C3F8的吸附行为和机理。结果表明,吸附量随C3F8质量浓度的增加而增大,随入口流量和吸附温度的增加而减小;3种因素的影响程度为进气质量浓度>温度>进气流量。吸附平衡模型结果符合Langmuir等温吸附模型,相关度达到0.999 3,动力学吸附模型符合拟一级动力学模型,表明13X分子筛对C3F8的吸附为物理吸附。在温度为30 ℃、进气流量为1.2 L/min、压力为0.12 MPa、C3F8气体质量浓度为459 mg/L(即ppm级)时,13X分子筛对C3F8的动态吸附可达到5.428 mmol/g,为工业上运用吸附脱除C3F8工艺提供了数据参考。

关键词: C3F8, 固定床吸附, 13X分子筛, 透过曲线, Langmuir吸附

Abstract:

The presence of perfluoropropane (C3F8) in the electronics industry will affect the arcing and insulation performance of sulfur hexafluoride (SF6) gas, it is necessary to separate C3F8. However, at present, C3F8 of low concentration can not be removed through cryoscopic separation method, and the research reports about using adsorption separation method for the adsorption of C3F8 are still few. This paper used the commercial 13X molecular sieve for adsorption of low concentration C3F8. As well, it simulated the industrial fisxed bed adsorption experiment and measured the dynamic adsorption performance of C3F8 on 13X molecular sieve. The breakthrough curve of commercial 13X molecular sieve for low concentration of C3F8 (ppm) was studied with the change of inlet flow rate, inlet C3F8 mass concentration and adsorption temperature, and the influence degree of each factor was analyzed. The adsorption equilibrium model and kinetic model were fitted by adsorption transmission curve to analyze the adsorption behavior and mechanism of 13X molecular sieve for low concentration of C3F8. The results show that the influence of these three factors orders as follows: inlet gas mass concentration > temperature > inlet flow rate. The adsorption equilibrium model accords with the Langmuir isothermal adsorption model, and the kinetic adsorption model accords with the pseudo-first-order kinetic model. When the temperature is 30 ℃, the inlet flow rate is 1.2 L/min, the pressure is 0.12 MPa, and the mass concentration of C3F8 gas is 459 mg/L (ppm), the dynamic adsorption of C3F8 by 13X molecular sieve can reach 5.428 mmol/g, which provides data reference for the industrial adsorption process of C3F8.

Key words: C3F8, fixed bed adsorption, 13X molecular sieve, breakthrough curve, Langmuir adsorption

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