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利用IROX2000傅立叶红外光谱仪测定不同甲醇含量的甲醇汽油样品,与气相色谱方法进行了对比,找出了红外光谱法准确测定甲醇汽油中甲醇含量的范围,并验证其可靠性。实验证明,中红外光谱法具有分析快速、重复性好、分析成本低等优点。 相似文献
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运用日本岛津公司生产的傅里叶变换红外光谱仪对汽油及甲缩醛进行扫描,获得不受其它组分干扰的甲缩醛的特征吸收峰;并根据朗伯-比尔定律,对甲缩醛进行定量分析。结果表明,傅里叶中红外光谱法可以准确测定汽油中的甲缩醛,该方法具有分析速度快、重复性好、分析成本低等优点。 相似文献
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介绍了傅立叶红外光谱测定汽油中苯含量的方法.以标准分析方法为参照,利用傅立叶红外光谱仪测定汽油的红外光谱,采用一阶微分和偏最小二乘法对汽油中的苯含量建立校正模型.该模型测定未知样品汽油苯含量的结果与标准分析方法的偏差符合标准方法的要求. 相似文献
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总结了近红外光谱法在汽油分析中的应用.包括:辛烷值、烯烃、芳烃含量、族组成、性和组成、生产控制中的分析和测定以及汽油牌号的识别. 相似文献
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阐述了"分光光度法"、"液相色谱法"和"红外光谱法"检测变压器油中T501抗氧化剂含量的原理,比较了三种方法检测的优缺点,结合本实验室利用红外光谱法测定变压器油的实际经验,并对红外光谱法测定绝缘油中T501含量的不确定度来源进行了分析,计算出此方法的不确定度,T501抗氧化剂含量在0.1%~0.5%浓度范围内,取包含因子k=2,在置信概率为0.95%时的相对扩展不确定度为1.28%。可知利用红外光谱法检测油中T501抗氧化剂含具有准确、快速、简便、稳定性好的特点。 相似文献
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一直以来车用汽油中含氧化合物分析基本均采用ASTMD4815或SH/T0663的方法,但随着车用汽油产品标准GB/T17930-2006版的出台,ASTMD4815和SH/T0663两种方法存在着部分含氧化合物分离效果较差、甲醇检测限达不到要求的问题,因此该分析方法迫切需要改进。该文提出采用多维气相色谱,利用经过硅烷化处理后的约1mTCEP微填柱和30mHP-1弹性毛细管柱,TCD和FID双检测器进行样品分离及检测,经过对柱系统和操作条件的优化,可准确地分析车用汽油中C1~C4醇类和醚类含氧化合物,甲醇检测限达到0.05%。方法重复性的相对标准偏差(RSD)≤0.827%,标准样品回收率在90%~110%之间。 相似文献
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应用HP6890气相色谱对汽油中含氧化合物(醇类和醚类)含量的分析方法进行了研究。采用柱切换—反吹气相色谱技术,利用强极性的微填充TCEP不锈钢柱作预切柱,放空挥发性轻烃,保留醇醚类含氧化合物,并将其反吹至石英毛细管WCOT柱进行详细分离,分析了阀切换时间可能影响定量准确性的原因,通过调整预切柱位置建立最佳的实验条件,用内标法定量,同时对方法的准确度和精密度进行了验证。结果表明,采用气相色谱分析技术,可以快速、准确地测定清洁汽油中的含氧化合物含量。 相似文献
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A fast and simple 1H NMR spectroscopic method was developed for the concentration measurement of aromatic, olefinic and aliphatic fractions in gasoline samples. Simultaneously, individual components such as benzene, methyl tert-butyl ether and several dienes could be determined. The method relies on only a few, well-established assumptions about the molecular compositions and is therefore applicable to a broad range of gasolines. It is well suited for laboratories with high sample throughput since measurement time is short and all concentrations are determined within one NMR experiment. The method was applied to commercial gasolines and samples used in European round robin tests. Comparisons of NMR and round robin test results showed excellent agreement. 相似文献
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Eliana Weber de Menezes Renato Catalua Dimitrios Samios Rosngela da Silva 《Fuel》2006,85(17-18):2567-2577
This study proposes an azeotropic ETBE/ethanol mixture as a possible oxygenated additive for the formulation of eurosuper-type gasolines. Two eurosuper gasolines with different chemical compositions and well defined characteristics of density, volatility and octane numbers are used. Gasoline formulations containing azeotropic mixtures display an intermediary behavior between that of ETBE (ethyl tert-butyl ether) and ethanol in gasoline blends. Formulations containing this additive offer advantages over ethanol (low volatility and low solubility in water) and ETBE (higher octane number and lower production cost). Gasolines with azeotropic additives show lower Reid vapor pressures (RVPs) than gasolines formulated with ethanol, and therefore low levels of volatile organic compounds, similarly to highly pure ETBE. The use of the azeotropic mixture containing ethanol (renewable, deriving from biomass) and ETBE (produced from ethanol and isobutene) in its formulation is environmentally attractive in industrialized countries due to the need to reduce carbon dioxide emissions. 相似文献
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The susceptibility of polycarbonate, polymethyl methacrylate, and cellulose acetate butyrate to gasoline-induced stress cracking was evaluated by measuring the critical strains of specimens exposed to a variety of commercial gasolines and gasoline components. Cellulose acetate butyrate exhibited the greatest resistance to gasoline followed by polymethyl methacrylate and polycarbonate. Stress cracking was a complex function of gasoline composition. Measured critical strains generally decreased and the severity of cracking of molded parts generally increased as the total aromatic content of the gasolines increased. However, a significant difference in critical strains was observed between the individual aliphatic components of gasoline. No correlation was observed between critical strain and gasoline type, i.e., premium, regular, or unleaded. The effect of time of exposure was examined, and it was observed that for some binary mixtures splashing caused much more severe cracking than continuous exposure. 相似文献
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烃重组技术和催化重整技术都可以生产高辛烷值汽油调和组分,采用气相色谱PONA分析法对烃重组汽油和催化重整汽油分别进行组成分析,并对数据结果进行对比讨论;PONA分析显示,虽然二者都是芳烃质量分数大于70%的高芳烃含量汽油,但在组成分布上存在明显不同;通过结果判断,烃重组汽油的芳烃集中在C_(8)~C_(10)范围,重整汽油中的芳烃组分宽泛存在于C_(6)~C_(11)范围;PONA谱图表明,在保留时间(60~100)min,重整汽油各组分峰几乎全部为尖锐且分离清晰的芳烃峰,而烃重组汽油谱图类似精制石脑油与重整汽油的峰形叠加,不仅包含重整汽油尖锐峰形的芳烃组分,也包含精制石脑油低矮杂多峰形的非芳烃组分。 相似文献
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In this paper, we have tried to classify 382 samples of gasoline and gasoline fractions by source (refinery or process) and type. Three sets of near infrared (NIR) spectra (450, 415, and 345 spectra) were used for classification of gasolines into 3 or 6 classes. We have compared the abilities of three different classification methods: linear discriminant analysis (LDA), soft independent modeling of class analogy (SIMCA), and multilayer perceptron (MLP) - to build effective and robust classification model. In all cases NIR spectroscopy was found to be effective for gasoline classification purposes. MLP technique was found to be the most effective method of classification model building. 相似文献
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介绍目前汽油中烃组成和含氧化合物含量分析的多维气相色谱法,从仪器流程、适用对象、测试范围、测试结果等多方面进行比较。SH/T0741方法仪器构造简单,分析简捷,特别适合装置馏出口等分析,ASTM D6839方法在分析复杂的成品汽油和未知的调合组分时,具有适用性广,分析结果准确性好的特点。结论可供相关人员在选择试验标准、采购设备和分析时参考。 相似文献