氯化钠和酪氨酸增强PVP抑制水合物的性能

油气输送管道在一定条件下会形成水合物,可能导致灾难性的后果,通过注入动力学抑制剂,可以延迟水合物的形成。在11.7 MPa和293.1 K条件下,向高压反应釜内注入混合气体(甲烷、乙烷和丙烷),实验研究NaCl和酪氨酸(L-tyrosine)对聚乙烯吡咯烷酮(PVP)抑制水合物性能的影响。通过测量水合物的成核温度、诱导时间和耗气量,评判NaCl和L-tyrosine对PVP抑制水合物的效果。实验结果表明:添加1%(质量分数,下同)的PVP后,水合物的成核温度为282.7 K,诱导时间为45 min,耗气量为5.96×10~(-2)mol;然而,添加0.25%NaCl、0.25%L-tyrosine与0.5%PVP组合抑制剂后,水合物的成核温度为281.7 K,诱导时间为65 min,耗气量为5.19×10~(-2)mol,比蒸馏水系统的气体消耗量减少了约27%。因此,NaCl和L-tyrosine能明显提高PVP抑制水合物的效果。

Enhancement of the performance of polyvinylpyrrolidone (PVP) for inhibiting hydrate formation by means of NaCl and L-tyrosine

Gas hydrates can be formed under certain conditions in oil and gas transmission pipelines,which may have disastrous consequences.Hydrate formation can be delayed by adding kinetic hydrate inhibitors.In a highpressure reactor with methane,ethane and propane gas mixture under a pressure of 11.7 MPa at 293.1 K,the effect of adding NaCl and L-tyrosine on polyvinylpyrrolidone (PVP) as a kinetic inhibitor of the formation of hydrates has been studied.By measuring the temperature of hydrate nucleation,induction time and gas consumption,the effect of NaCl,L-tyrosine and PVP on the inhibition of hydrate formation were studied.The experimental results show that when adding 1％ PVP,the temperature of hydrate nucleation is about 282.7 K,the induction time is 45 minutes and the total consumption of gas mixture is 5.96 × 10-2 mol.However,when adding 0.25％ NaCl,0.25％ L-tyrosine and 0.5％ PVP,the temperature of hydrate nucleation is about 281.7K,the induction time is 65 minutes and the total consumption of gas mixtureis 5.19 × 10-2 mol.The gas consumption is reduced by about 27％ compared to the pure water system.Therefore,NaCl and L-tyrosine can significantly improve the inhibition performance of PVP.