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Evaluation of Effects of Selected Wax Inhibitors on Wax Appearance and Dissolution Temperatures

机译:评价所选蜡抑制剂对蜡外观和溶出温度的影响

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In this investigation, a light transmittance method was used to evaluate the wax appearance temperatures (WAT) and wax disappearance temperatures (WDT) of model paraffin compounds (n-C_(24)H_(50) (C24) and n-C_(36)H_(74) (C36)) in n-decane (C10) solutions both with and without wax inhibitors. The change in WAT at different paraffin concentrations in the presence of an inhibitor behaves as though there is a constant amount of paraffin removed by the inhibitor. However, the amount of apparent paraffins reduction by an inhibitor (e.g. 160 g of C24 by one gram of an inhibitor) indicates that the inhibition mechanism cannot easily be explained by a simple "sequestering" effect. Wax inhibitors that decrease the WAT tend to also increase the WDT. Most of the wax inhibitors tested at a dosage of 100 ppm did suppress the WAT of lower molecular weight paraffin (C24) solutions, but had little or no effect for higher molecular weight paraffin (C36) solutions. Side-chain length of polymethacrylate wax inhibitors is an important performance parameter. Of the three polymethacrylate wax inhibitors tested, the one with the longest alkyl side-chain (C18) had the most effect on suppressing the WAT and increasing the WDT of the binary mixtures (n-C10 ― n-C24 solutions).
机译:在该研究中,使用的光透射率的方法来评估模型石蜡化合物(正C_(24)H_(50)(C24)和正C_的蜡出现温度(WAT)和蜡消失温度(WDT)(36 )H_(74)(C36))在具有和不具有蜡抑制剂正癸烷(C10)的解决方案。在不同的石蜡浓度的抑制剂的行为的存在下,在WAT的变化,就好像有由抑制剂除去石蜡恒定量。然而,通过一种抑制剂(例如160克C24的由抑制剂一克)的表观链烷烃减少的量表明该抑制机制不能容易地通过简单的“螯合效应”说明。这降低了WAT蜡抑制剂往往也增加了WDT。大多数在100ppm的剂量测试的蜡抑制剂的那样的低分子量烷烃(C24)的解决方案的抑制WAT,但不得不为较高分子量的石蜡(C36)的解决方案几乎没有或没有影响。聚甲基丙烯酸酯蜡抑制剂的侧链长度是一个重要的性能参数。测试的三种聚甲基丙烯酸酯蜡抑制剂,一种具有最长烷基侧链(C18)对抑制WAT和增加二元混合物的WDT最影响第(n-C10 - 正C24溶液)。

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