摘要：本设计是以年产40000吨的粗苯作为分离目标，采用精馏塔分离的工艺方法，对整个工段进行工艺设计和设备选型。最终使得在苯塔和甲苯塔中，苯的含量达到99.50%，邻二甲苯收率为99%。本文针对整个设计要求对整个工艺流程进行物料衡算，热量衡算。并根据热力学定律，对精馏塔进行热量衡算，求得理论塔板数（分别为11块和13块）、实际塔板数（分别为22块和25块）以及最小回流比（分别为1和2.9）。并根据设计要求，对精馏塔的塔径、塔高、塔顶冷凝器、塔底再沸器，理论上进行了尺寸计算及选择。并且分别对精馏段、提镏段进行了校核。满足设计要求，达到所需要的工艺条件。本着理论联系实际的精神。本文对整个工艺流程及车间生产进行了经济技术分析，其中包各部件的材质、用材量的选择的经济评价、设备投资及投资回收期的计算。

关键词：物料衡算 甲苯 邻二甲苯 热量衡算 精馏

Abstract:The design is based on an annual output of 40，000 tons for the production of crude benzol with using column distillation to do the whole process design and equipment selections．And we make the target：we will get the benzene 99.50%，and the O-xylene  is 99%．Based on the design requirements of the entire process of the material balance and energy balance．According to the laws of thermodynamics，right Distillation tower of the heat balance．Through on the driver，and seek the theory of plate numbers（11and13），the actual plate number（22and25） and the minimum reflux ratio（1and2.9）．And based on the design requirements of Distillation Tower is high to the tower path，tower condenser and reboiler bottom，theoretical calculation of the size and choice．Respectively distillation of the right，stripper of the check．As far as possible to meet the design requirements to achieve the required conditions．In theory with practical spirit．In this paper，the whole production process and conduct workshops on economic and technical analysis，which includes parts of the material，feed with the choice of economic evaluation，equipment and speculative investment payback period calculations．

Keywords:material balance，benzene，O-xylene，energy balance，Distillatio