Environmental plasticizer di(2-ethylhexyl) 1 ,2-cyclohexane dicarboxylate was synthesized through esterification reaction of 1 ,2-cyclohexanedicarboxylic acid (CHDA ) with iso-octanol using concentrated sulfuric acid as catalyst .Effects of reaction time , ratio of alcohol to acid and temperature on esterification rate were investigated . Under optimal reaction conditions :6 h ,170 ℃ ,n(alcohol)/n(acid) = 2 .5∶1 ,esterification rate and yield mount to 99 .5% and 95% ,respectively . The product was colorless transparent oily liquid .In the 1 H-NMR spectra ,the multiplet for the -COOCH2 appeared at δ=4.0 .IR spectra exhibitedυ(C O) band at 1 735 cm -1 .The results demonstrate the target product was synthesized .TG curve shows that initial temperature was 215 ℃ .Also ,a method for qualitative analysis was established ,the retention time of the product were 14.310 min and 14 .505 min ,which can separate from DOP effectively .%以1，2-环己二甲酸和异辛醇为原料，浓硫酸为催化剂，酯化合成环保增塑剂环己烷1，2-二甲酸二异辛酯，考察了反应时间、醇酸物质的量比、反应温度等对酯化率的影响，并对产物进行了1 H-NMR、IR、TG及气相定性分析。结果表明，反应时间6 h ，反应温度170℃，醇酸物质的量比为2．5∶1时，酯化率可达99．5％，收率95％，产品为无色油状液体。核磁氢谱显示与酯基相连的亚甲基的多重峰信号δ在4.0处，红外谱图显示酯羰基的伸缩振动峰出现在1735 cm -1处，这些结果表明得到了预期产物。产物的T G曲线显示其外延起始温度为215℃，其气相出峰时间为14．310 min和14．505 min ，能够与邻苯二甲酸二异辛酯（DOP）有效分离。
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