基于十八醇磷酸酯单乙醇铵盐的天然气减阻剂室内评价

目前，降低天然气输送阻力、提高管道输送能力的方法包括管道内涂层减阻技术和天然气管输减阻剂技术。由于内涂层技术在施工上存在种种缺陷，因而对天然气管输减阻剂的研究成为天然气输送领域的新热点。为此，根据天然气管输减阻剂的减阻机理，在已有的高碳醇磷酸酯盐合成工艺的基础上，设计合成了十八醇磷酸酯单乙醇铵盐（OPEM）作为天然气管输减阻剂样品，利用室内环道评价系统对其0.1、0.2、0.3 g/100 mL的乙醇溶液减阻效果进行了评价。结果表明，该样品具有一定的减阻效果，在0.2 g/100 mL浓度时其减阻效果最好，减阻率在140 m^3/h流量条件下达到最大值8.0%。并采用L₁₆（5⁴）正交表设计了正交实验对其合成工艺进行了优化，得到最佳工艺条件为：酯化时间为6 h，酯化温度为70 ℃，物料比为3.5∶1，加水比为1∶1，水解温度为90 ℃。

Laboratory evaluation of a natural gas drag reduction agent (DRA) based on octadecanol phosphate ester monoethanolammonium

At present, the main methods of reducing the natural gas transportation resistance and improving the pipeline transmission capability include drag reduction by inner coating and that by drag reduction agent in pipelines. Due to all sorts of shortcomings in operations of inner coating technology, the research of drag reduction agent has aroused general concern in the field of natural gas pipelines. Therefore, according to the mechanism of drag reduction agent in natural gas pipelines, a drag agent sample of octadecanol phosphate ester monoethanolammonium (OPEM) was synthesized based on the pre existing synthesis technology of high alkyl phosphate. Then an evaluation study was performed on the drag reducing effect of three OPEM ethanol solutions (0.1, 0.2, 0.3 g/100mL) by use of an indoor simulating circular track evaluation system. Evaluation results show that this synthesized sample has a certain drag reducing effect and when the 0.2 g/mL OPEM ethanol solution is applied, the drag reducing performance will be the best with the highest drag reducing effect of 8% at a volume flow rate of 140 m3/h. Finally , the OPEM's synthesis conditions are optimized by L16（54） orthogonal experiments as follows: esterification time 6 h, esterification temperature 70℃, material ratio 3.5∶1, water addition 1∶1, hydrolysis temperature 90℃.