【摘要】 采用高效θ环填料塔,通过真空精馏的方法精制提纯2,3-二氯-5-三氟甲基吡啶粗品,产品纯度达到99%以上,瞬时纯度可以达到99.3%,最高收率在75%以上。通过对该产品的间歇蒸馏过程的研究,得到了适宜的操作条件:压力P=10kPa～30kPa,回流比R=10～30。试验证实采用变操作参数的分批精馏操作有利于提高产品的质量和收率。更多还原

【Abstract】 2,3-Dichloro-5-trifluoromethylpyridine is rectified by vacuum distillation with high efficient packed tower with θ filler,the product purity is over 99%,99.3% at instant,the yield is over 75%.Through the study of multivariable batch distillation process,the optimized operation parameters were obtained,the pressure is 10kPa～30kPa,the reflux ratio is 4～1 2,The experimentation indicated that multivariable batch distillation process could improve the yield.更多还原