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烷属烃,环烷属烃及石油分馏油份的折光率与密度的计算值,在石油分馏油份烃属化合物分析工作中,是两种极为重要的数据.这两种数据的功用:在用来估计汽油内所含芳香族烃的数量;用来计算分散性系数(specific dispersion);用来测定双键率(double bond index);并且用来检查石油分馏油份中的不饱和烃——包括烯属烃及芳香族烃——是否业已除尽,李普金(Lipkin)及马丁(Martin)两氏在1946年会建议用公式(Ⅰ)及公式(Ⅱ)来计算烷属烃,环烷属烃及石油分馏油份在20℃时鈵缐折光率及在20℃时的密度:
The calculated values of the refractive index and density of paraffins, naphthenes and petroleum fractions are two extremely important data in the analysis of petroleum fractionated hydrocarbons and hydrocarbons. The function of these two data is as follows: Used to estimate the amount of aromatic hydrocarbons contained in the gasoline; used to calculate the specific dispersion; used to determine the double bond index (double bond index); and used to check oil fractionated oil unsaturated hydrocarbons - Including olefins and aromatic hydrocarbons - have been eliminated. Lipkin and Martin both proposed in 1946 to use formulas (I) and (II) to calculate paraffins, naphthenes Is a hydrocarbon and petroleum fractionated oil at 20 ℃ 鈵 缐 refractive index and density at 20 ℃: