含高比例疏水单体的降阻剂的合成及性能评价

Synthesis and Performance Evaluation of a Drag Reducer Agent Containing High Proportion of Hydrophobic Monomer

摘要:

使用3-溴丙烯和N,N-二甲基十八烷基叔胺合成水溶性阳离子疏水单体N,N-二甲基十八烷基烯丙基溴化铵，仅使用水作为溶剂，合成了含有高比例疏水单体的部分水解聚丙烯酰胺型降阻剂，以核磁共振氢谱证明了产物结构与预设一致，计算得到疏水单体在产物中占摩尔比为1%，激光光散射法测得降阻剂相对分子质量为1.22×107 g/mol，粘度法测得临界缔合浓度为0.28%。测试不同浓度下的降阻剂稀溶液在管道中不同流速下的摩阻，以清水的为空白组计算降阻率，当降阻剂加量为0.13%时，降阻率最高可达72%；在盐水中，降阻率下降，通过提高加量的方式可以提升降阻率，加量为0.2%时，降阻率最高达70.06%。由SEM得知，降阻剂在水中形成的网状结构是聚合物具有降阻性的直接原因。

Abstract:

A water-soluble cationic hydrophobic monomer, N, N-dimethyl octadecyl allyl ammonium bromide, was synthesized by using 3-bromopropene and N,N-dimethyloctadecylamine in acetone. Using water as solvent, a partially hydrolyzed polyacrylamide containing high proportion of hydrophobic monomer was synthesized and aimed to be used as drag reducer agent (DRA). NMR spectrum confirmed that structure of the product was consistent with the preset and hydrophobic monomer accounted for 1%, molecular weight of the drag reducer was 1.22×107 g/mol which characterized by laser light scattering. The critical association concentration measured by the viscosity method is 0.28%. Friction of diluent solution at different flow rates in the pipeline was tested, and drag reductions (DR) were calculated by using the clear water as blank group. When the concentration of DRA is 0.13%, DR can reach up to 72%. In salt water, DR decreases. By increasing concentration of DRA, DR can be increased. When the amount is 0.2%, DR is up to 70.06%. It is known from SEM that network structure formed by DRA in water is the direct cause of the resistance reduction of DRA.