EVA流动改进剂的分子量及分子量分布对大庆原油流变性的影响

研究了两类醋酸乙烯酯（ＶＡ）含量不同的乙烯－醋酸乙烯酯共聚物（ＥＶＡ）流动改进剂的分子量（Ｍｎ：１０３００～２５８０Ｎ和分子量分布（ｄ：１．４５～３．９）对大庆高蜡原油低温流动行为的影响。实验结果表明，在８０克原油中含有２００ＰＰｍ分子量或分子量分布不同的各种ＥＶＡ流动改进剂都不同程度改善了大庆原油的低温流变性。当改进剂分子量分布相近时，改进剂的改进效果存在某一最佳分子量；当改进剂分子量相近并处于最佳分子量范围内时，则窄分布改进剂的效果比宽分布的改进剂为佳。反之，以宽分布改进剂为宜。

Effects of Molecular Weight and Molecular Weight Distribution of EVA Flow Improvers on the Flowability of Daqing Crude Oil

A reaction kinetic study for electrochemical reduction of nitrobenzene was performed at Cu electrode in H_2SO_4 aqueous solution.The study was carried out on a rotating disc electrode at four different temperatures. Quantitative reaction rates were obtained by di-fferential-conversion experiments and indentified by integral-conversion experiments.Thekinetic expressions represent a simplified schame for cleetroreduction of nitrobenzene to anilineand phenylhydroxylamine,and incorporate the dependence on reactant concentration,temperatureand potential.Results of this paper are suitable for use in reactor design and process moldeling.