Abstract: Polyynes was obtained through dehydrochlorination of chlorinated paraffins-70 (CP-70） in an alcohol solution of sodium hydroxide. The as-prepared polyynes were analyzed and characterized with respect to chlorine content，double bond value and chain structure by using ionic spectroscopy，iodometry，and IR spectroscopy. The dechlorization reaction was favored by increasing NaOH concentration，higher temperature and longer reaction time. Moreover，the polyynes prepared at a higher temperature contained more conjugated double bonds and triple bonds.

Key words: chorinated paraffins-70, dechlorination, polyynes, ion chromatography

摘要： 通过氯化石蜡?70（CP-70）在NaOH乙醇溶液中的脱氯反应制得了石蜡烯，并对产品的氯含量、双键值和结构分别采用离子色谱、碘量法和红外光谱法进行了分析和表征。研究发现，NaOH浓度增加、温度上升和反应时间延长有助于提高脱氯反应的程度；碘量法和红外光谱的分析结果表明，在较高温度下制得的石蜡烯含有更多的共轭双键和三键。

关键词: 氯化石蜡-70, 脱氯, 石蜡烯, 离子色谱