新型离子液体的合成及其阳离子基团缓蚀性能

以高纯环烷酸为原料,合成了一系列含咪唑啉环的新型离子液体Ⅰ～Ⅴ,探讨了阳离子咪唑啉基团中N_（3）原子上取代基与缓蚀性能的关系.采用碳钢挂片失重法和电化学测试法,评价了它们在酸性溶液中的缓蚀性能;采用量子化学法和极化效应指数法,分别计算了离子液体Ⅰ～Ⅴ阳离子咪唑啉基团的前线轨道能量及其相应的PEI等参数.实验结果和理论分析表明：离子液体Ⅰ～Ⅴ阳离子咪唑啉基团的缓蚀效率呈现如下关系,Ⅴ＞Ⅳ＞Ⅲ＞Ⅱ＞Ⅰ;其缓蚀效率与E_HOMO、ΔE_L-H和PEI等参数间均具有良好的线性关系.     

分光光度测溴法定量分析二甲基硫(DMS)的含量

使用苯作为生物排放含硫化合物二甲基硫的吸收液,吸收后以溴水氧化.通过间接测定溴的质量分数,从而确定DMS的质量浓度.该方法测定DMS的波长为460nm,线性范围为0.08～25mg/L,表观摩尔吸光系数为4.5×105,相关系数为0.9963.同时,对DMS和Br2的反应机理进行讨论.     

Influence of alkyl group of imidazolinyl-quaternary-ammonium-salt on corrosion inhibition efficiency

The action between imidazolinyl-quaternary-ammonium-salt（IQAS） molecule and Fe atom was studied, and the influence of the alkyl group connected with N atom of imidazoline ring on corrosion inhibition efficiency was explored. Quantum chemical methods, HF/6 - 31 G and HF/Lan L2 dz, were applied successively to calculate the parameters such as front molecular orbit energy of IQAS Ⅰ-Ⅳ and chemical adsorption for IQAS Ⅰ-Ⅳ and Fe atom. The corrosion inhibition efficiency was measured with the weight loss method of carbon steel samples in acidic solution and oil field sewage. Based on the theoretical analyses and experimental results, it is concluded that N-Fe coordination bond is formed between IQAS molecule and Fe atom, corrosion inhibition efficiency is decreased in the following order（from large to small） ： IQAS Ⅳ, IQAS Ⅲ, IQAS Ⅱ , IQAS Ⅰ.