缓蚀剂复合mea捕集co2及缓蚀作用研究..doc

缓蚀剂复合MEA捕集CO2及缓蚀作用研究 .中国矿业大学化工学院 , 江苏 徐州 221008?? Study on MEA removal CO2 Effect and inhibitive Efficiency of Complex Corrosion Inhibitors Yuan Long1 ，Zhu YihuaLiu Jianzhou 2 （Xuzhou Medical Higher Vocational School，Xuzhou Jiangsu 221116；School of Chemical Engineering and Technology, China Univ. of Mining Tech., Xuzhou 221008Ethanolamine (MEA), with a strong alkaline and corrosive to metal, is a common CO2 absorbent. Na2MoO4, Zn(OOCCH3)2 and EDTA-Na4 were added into the absorption liquid of MEA trapping CO2 to modify MEA?absorption?capability. Weight-loss method was used for studying different corrosion inhibitors on the corrosion performance of 60# steel. With testing absorption rate and capacity of MEA absorbing CO2, orthogonal experiment was used for selecting the suitable compositions of complex corrosion inhibitors. The results show that the inhibiting rate is 73.10% when the complex corrosion inhibitors are 60mg/L Na2MoO4, 5mg/L Zn(OOCCH3)2 and 20mg/L EDTA-Na4. Comparing with a single corrosion inhibitor, the absorption liquid of the three corrosion inhibitors has a more significant inhibition efficiency. The corrosion of MEA with a high purity to 60# steel is gently, but it becomes serious after MEA absorbing CO2. Corrosion products are mainly α-FeO(OH) by means of XRD. 60# steel surface morphology was tested by means of SEM to discuss the corrosion inhibition mechanism. Keywords: CO2; MEA; Corrosion Inhibitor; Orthogonal experiment; SEM; XRD 自工业革命以来，大气中CO2含量增加了37%，CO2的过度排放和减排已经成为全球面临的问题。政府间气候变化专门委员会(IPCC)预测[1]：从2002年到2030年，世界CO2净增量为420多亿吨；到2100年，大气中CO2的浓度将达到560~970ppm，直接导致地球温度上升1.9 ℃。CO2是一种重要的碳资源，已广泛应用于农业、食品、消防等领域[2]。实现CO2的高纯度捕集与资源化循环利用，可为充分利用资源与减缓环境问题提供强力保障。 化石燃料燃烧排放的CO2量占到总排放量的80%，其中燃煤电厂排放的CO2占化石燃料排放的30%。燃煤CO2排放量大且集中，有利于CO2的规模化捕集。CO2是常用MEA具有吸收速率快和吸收效率高等特点得到了广泛的应用[3]。燃煤烟气中成分复杂，除CO2外还含有SO2、NOx、少量O2等，CO2过程中，加大了有机胺的降解和消耗，Na2MoO4毒性低、热稳定性和氧化稳定性高、耐酸碱性能好、对碳钢有良好的缓蚀性能，是目前应用较好的环境友好型缓蚀剂。于凯[5]等采用XPS对有Na2MoO4存在的情况下铁表面保护膜的组成进行了分析，证明铁表面生成了由稳定的Fe2O3、MoO3、FeMoO4组成的缓