| 摘要: |
| 目的 解决1-丁基-3-甲基咪唑四氯化铁(FeCl4)离子液体在天然气脱硫过程中存在的腐蚀问题。方法 基于失重法,在不同温度、水含量、再生温度下研究了FeCl4对304不锈钢的腐蚀行为,并通过SEM、XRD、XPS等表征手段分析了其腐蚀机理。结果 FeCl4对304不锈钢的腐蚀速率随着浸泡温度、水含量的升高而增大,随着再生温度的升高呈现先增大后减小的趋势,且在70 ℃时腐蚀速率最低(0.380 mm/a)。结论 FeCl4电离出的Cl-通过穿透腐蚀产物膜对金属基体造成的腐蚀是FeCl4水溶液中304不锈钢腐蚀的主要原因,提高再生温度可有效抑制Cl-的电离,进而减缓腐蚀的进行。 |
| 关键词: FeCl4 离子液体 脱硫 腐蚀 304不锈钢 水含量 氯离子 |
| DOI：10.3969/j.issn.1007-3426.2022.03.002 |
| 分类号: |
| 基金项目:四川省科技创新苗子工程资助项目“锆基金属-有机骨架固载功能性离子液体复合材料的制备及烟气脱硫性能研究”(2021104) |
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| Study on corrosion behavior of FeCl4 ionic liquids used in desulfurization system |
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Kang Luoming1,2, Li Airong1, Lu Yuan3, Wang Cheng1
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1. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China;2. Sichuan Institute of Fine Chemical Research & Design, Zigong, Sichuan, China;3. CNOOC Ener-Tech Oilfield Chemical Co, Ltd, Tianjin, China
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| Abstract: |
| Objective Solve the corrosion problem of 1-butyl-3-methylimidazolium ferric tetrachloride(FeCl4) ionic liquid in the process of natural gas desulfurization. Methods The corrosion behavior of FeCl4 on 304 stainless steel at different temperatures, water contents and regeneration temperature was studied based on weight loss method, and the corrosion mechanism was analyzed by means of SEM, XRD, XPS, and so on. Results The corrosion rate of FeCl4 increased with the increase of immersion temperature and water content, increased at first and decreased with the increase of regeneration temperature, and the lowest corrosion rate was 0.380 mm/a at 70 ℃. Conclusion sThe corrosion of FeCl4 ionized Cl- to the metal matrix through the corrosion product film is the main reason for the corrosion of 304 stainless steel in FeCl4 aqueous solution. Increasing the regeneration temperature can effectively restrain the ionization of Cl-, and then slow down the corrosion. |
| Key words: FeCl4 ionic liquid desulfurization corrosion 304 stainless steel water content chloridion |
