天然气输送管道用新型缓蚀剂的制备及性能研究

Study on preparation and performance of new corrosion inhibitors for natural gas pipeline

为有效降低天然气输送管道的腐蚀速率,提高管道的运行效率,以植物油酸、多乙烯多胺和尿素为原料,通过两步法制备了一种天然气集输管道用新型缓蚀剂XHT-1。以合成产物产率为评价指标,对中间产物X和最终产物XHT-1的合成工艺进行了优化,并以缓蚀率为评价指标,对新型缓蚀剂XHT-1的腐蚀防护效果进行了评价。结果表明,当植物油酸和多乙烯多胺的单体摩尔比为1∶1.2、反应温度为130℃、反应时间为3h时,中间产物X的产率最大(90.6%);当中间产物X和尿素单体摩尔比为1∶0.8、反应温度为140℃、反应时间为4h时,新型缓蚀剂XHT-1的产率最大(98.2%)。新型缓蚀剂XHT-1的浓度越大,缓蚀率相对就越大,当XHT-1的浓度为300mg·L^(-1)时,缓蚀率可达到95.8%,缓蚀效果较好。研究结果认为,新型缓蚀剂XHT-1能够用于目标天然气输送管道的腐蚀防护中。

In order to effectively reduce the corrosion rate of natural gas transmission pipelines and improve their operational efficiency,a new corrosion inhibitor XHT-1 for natural gas gathering and transportation pipelines was prepared using vegetable oleic acid,polyethylene polyamines,and urea as raw materials through a two-step method.The synthesis process of intermediate product X and final product XHT-1 was optimized using synthetic product yield as the evaluation index,and the corrosion protection effect of the new corrosion inhibitor XHT-1 was evaluated using corrosion inhibition rate as the evaluation index.The results showed that the yield of intermediate product X was the highest(90.6%) when the monomer molar ratio of vegetable oleic acid and polyethylene polyamines was 1∶1.2,the reaction temperature was 130℃,and the reaction time was 3 hours;When the molar ratio of intermediate product X to urea monomer was 1∶0.8,the reaction temperature was 140℃,and the reaction time was 4 hours,the yield of the new corrosion inhibitor XHT-1 was the highest(98.2%).The higher the concentration of the new corrosion inhibitor XHT-1,the higher the corrosion inhibition rate.When the concentration of XHT-1 was 300mg·L^(-1),the corrosion inhibition rate could reach 95.8%,indicating a good corrosion inhibition effect.The research results suggest that the new corrosion inhibitor XHT-1 can be used for corrosion protection of target natural gas transmission pipelines.