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化学反应和气相色谱法联合测定含烯汽油中共轭二烯烃含量
引用本文:徐亚贤,张龙,吕九琢.化学反应和气相色谱法联合测定含烯汽油中共轭二烯烃含量[J].石油化工,1998(5).
作者姓名:徐亚贤  张龙  吕九琢
作者单位:北京石油化工学院化工系
摘    要:建立了利用共轭二烯烃与马来酸酐的Diels-Alder特性反应和1m×1.7mm(id)非极性固定液SE-30填充柱气相色谱法联合分析含烯汽油中的共轭二烯烃含量的方法。该柱能用低碳数的正构烷烃如正十一烷作内标物,内标物与油样组份分离很好,色谱分析一次4min,油样的相对标准偏差为1.7%。在一定的化学反应条件下,用I2和AlCl3作催化剂,当I2、AlCl3与共轭二烯烃的物质的量比分别为0.8×10-5和(1~2)×10-3时,异戊二烯有最高的转化率分别为68.51%和98.18%,回流反应装置的挥发损失率为0.28%。

关 键 词:共轭二烯烃  石油产品  Diels-Alder反应  填充柱气相色谱法

Determination of Conjugated Dienes in Petroleum Products by the Combined Method of Chemical Reaction with Gas Chromatography
Abstract:he content of conjugated dienes in petroleum products is determined by the method of combination of chemical reaction with gas chromatographyThe chromatographic column is a 1m×1.7mm (id) packed column coated with nonpolar stationary phase SE 30Normal paraffin hydrocarbons of low carbon number (n C011) can be used as internal standard compound which separated readily from the oil componentsA single run of chromatographic analysis takes 4 minThe relative standard deviation in analytic results is 1.7% Iodine and aluminium chloride are used as the catalyst for Diels Alder reaction between conjugated dienes and maleic anhydrideThe vapor losses of the vessel of return current are studiedUnder the specific conditions of chemical reaction,when the mole ratio of iodine to conjugated dienes is 0.8×10-5,the conversion of isoprene has a maximum value of 6851%;when the mole ratio of aluminium chloride to dienes is 1~2×10.3,the conversion is 98.18%The vapor losses of the vessel is 0.28%
Keywords:conjugated dienes  petroleum products  Diels Alder reaction  gas chromatography
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