环烷酸缓蚀剂的合成及缓蚀性能的应用

Synthesis of naphthenic acid corrosion inhibitor and application study on corrosion inhibition performance

以3-氯丙酸乙酯、甲基苯并三氮唑、水合肼、2-吡啶甲酰氯为原料,通过三步法合成反应,合成出了酰胺类抑制环烷酸腐蚀的高温环烷酸缓蚀剂。通过红外、热分析表征,进一步明确了产品的主要官能团及分解温度变化趋势。通过小试得到的工艺参数,确定了中试的反应条件,生产出合格的中试产品。在炼厂常减压装置加注后,分别考察了装置易腐蚀的关键减压侧线油部位,即减二线和减三线油中的铁离子,考察初期即成膜期,高温环烷酸缓蚀剂的加注量为50mg/L,待系统稳定后,加注量稳定在30mg/L的条件下,减二线油和减三线油的铁离子含量由0.92mg/L和0.98mg/L降到0.17mg/L和0.11mg/L,说明加注高温环烷酸缓蚀剂大大降低了环烷酸对炼油装置的腐蚀程度。

Though three step synthesis reaction, amide naphthenie acid corrosion inhibitor which is used in high-temperature naphthenic acid environment was synthesized from 3-chloropropionic acid, TTA hydrazine hydrate and 2-pyridine chloride. The main functional groups and the decomposition temperature of the product were further defined by the infrared and thermal analysis. The reaction conditions of pilot experiment were determined by the process parameters of lab-scale and qualified pilot product was produced. After the high temperature corrosive inhibitor is filled in refinery distillation unit, the iron content of decompression line oil is investigated. The inhibitor is filled with 50mg/L for film formation stage and 30mg/L for stable stage. And the iron content of the second and third vacuum side-stream is decreased to 0.17mg/L and 0. 11mg/L from 0.92mg/L and 0. 98mg/L, so that the high temperature naphthenic acid corrosion inhibitor can greatly reduce the naphthenic acid corrosion of refinery equipment.