生物柴油抗氧化剂的抗氧-缓蚀协同作用研究Investigation of antioxidant-corrosion inhibition synergism of biodiesel antioxidants

• Published in: Zhongguo you zhi Vol. 50; no. 9; pp. 56 - 60
• Main Author: 陈仁义1，2，3，隋猛1，3，覃该安4，李法社1，3，赵中锦1，3CHEN Renyi1,2,3, SUI Meng1,3, QIN Gaian4, LI Fashe1,3, ZHAO Zhongjin1,3
• Format: Journal Article
• Language: English
• Published: 中粮工科（西安）国际工程有限公司 01.09.2025
• Subjects: biodiesel; antioxidant; oxidation induction time; corrosion; corrosion inhibitor; 生物柴油；抗氧化；氧化诱导时间；腐蚀；缓蚀剂
• ISSN: 1003-7969
• DOI: 10.19902/j.cnki.zgyz.1003-7969.240327

旨在为生物柴油生产企业的产品指标保证提供参考，向小桐子生物柴油中分别添加丁基羟基茴香醚（BHA）、3，5-二叔丁基-4-羟基甲苯（BHT）、四乙烯五胺（TEPA）3种抗氧化剂，考察3种抗氧化剂对生物柴油氧化安定性和腐蚀性的影响。结果表明：3种抗氧化剂均可提高生物柴油的氧化安定性，其中TEPA的效果最佳；3种抗氧化剂均具有较好的缓蚀性能，添加0.1%3种抗氧剂后铜片腐蚀等级均达到1a，符合国家标准要求；TEPA的缓蚀效果最佳，在其添加量为0.2%时，小桐子生物柴油的腐蚀速率、缓蚀率和覆盖度分别为42.76 g/(m2·h)、80.24%和0.82；与未添加抗氧化剂相比，添加0.1%TEPA的生物柴油腐蚀96 h的铜片，其表面铜元素含量由69.6%提高到79.2%，同时碳元素、氧元素和氮元素含量分别降低7.9、0.5、1.2百分点。综上，TEPA可以捕捉铜离子，形成铜离子螯合物，抑制生物柴油被铜离子催化氧化，减缓生物柴油腐蚀铜片，起到抗氧、缓蚀的效果。 To provide a reference for the biodiesel production enterprises to ensure the product index, three kinds of antioxidants namely butylated hydroxyanisole (BHA), 3,5-di-tert-butyl-4-hydroxytoluene (BHT), and tetraethylenepentamine (TEPA) were added to Jatropha biodiesel, respectively. Their effects on the oxidative stability and corrosivity of biodiesel were investigated. The results showed that three kinds of antioxidants improved the oxidative stability of biodiesel, with TEPA exhibiting the most significant effect. Additionally, these antioxidants displayed excellent corrosion inhibition properties. After adding 0.1%, the copper corrosion grade reached 1a, meeting national standard requirements. TEPA again showed the best corrosion inhibition performance, and at an addition level of 0.2%, the corrosion rate, inhibition efficiency, and coverage of Jatropha biodiesel were 42.76 g/(m2·h), 80.24% and 0.82, respectively. Compared with biodiesel without antioxidants, the copper content on the surface of a copper sheet corroded for 96 h in biodiesel with 0.1% TEPA increased from 69.6% to 79.2%, while carbon, oxygen, and nitrogen contents decreased by 7.9, 0.5, and 1.2 percentage points, respectively. In conclusion, TEPA can capture copper ions and form copper ion chelates to inhibit the catalytic oxidation of biodiesel, and slowing the corrosion of the copper sheet by biodiesel, thereby providing both antioxidant and corrosion inhibition effect.