1、 I 设计说明设计说明 本设计是针对处理量为 4 万吨/年的粗苯精制工艺， 采用的是溶剂萃取低温加 氢工艺， 萃取剂是 N-甲酰吗啉。 在本设计中精馏工段主要有四个塔， 即预精馏塔， 萃取精馏塔，纯苯塔和二甲苯塔，在本设计的设计计算中主要是对纯苯塔做了详 细计算，分别对其进行了物料衡算，热量衡算，纯苯塔的设计计算，以及塔附件 的计算。并对其进行了流体力学性能的验算，以及塔板负荷性能图的绘制。其中 计算出纯苯塔主要参数为： 塔径 1.4m， 塔高 19m， 实际塔板数 32 块， 板间距 0.4m。 其中精馏段塔板数为 11 块，提馏段塔板数为 21 块等等，经过精制后使甲苯含量 小于 0.3%
2、， 苯含量大于 99.7%， 二甲苯含量小于 4.0%。 最后又绘制了工艺流程图， 物料衡算图，以及纯苯塔的主体设备图。其中纯苯塔塔顶温度为 80，塔釜温度 为 120。 本设计的产品有纯苯、甲苯、二甲苯、非芳烃、重苯，其中最主要的产品是 纯苯、甲苯和二甲苯。 【关键词】【关键词】粗苯，加氢，精制，苯 II Design descriptions This design is for productivity for 40000 tons/year of coarse benzene refining process, USES is the solvent extraction low te
3、mperature hydrogenation process, extracting agent is N-formex Lin. In this design distillation section there are four main tower, namely the column, extraction column, pure benzene tower and xylene tower, in the design of the design and calculation is mainly to the pure benzene tower made detailed c
4、alculation, respectively, on the material balance calculations, heat balance calculations, pure benzene tower design calculation, and the calculation of tower accessories. And its fluid mechanics properties of the link, and tower plate load performance drawing. Calculate the pure benzene tower of ma
5、in parameters for: tower 1.4 m diameter, high tower 19 m, actual tower number 32 block board, board spacing 0.4 m. Rectifying section of tower number plate for of 11, ask for fractions for 21 block tower board, etc, the finished to less than 0.3% after the toluene content, benzene content than the 9
6、9.7%, dimethyl benzene content is less than 4.0%. Finally and mapped the process flow diagram, material calculation chart, and pure benzene tower main equipment of the figure. Among them pure benzene tower temperature 80 tower, column reactor temperature of 120 . The design of the products have pure benzene, toluene, xylene, the aromatics, heavy benzene, one of the main product is pure benzene, toluene and xylene. Key words ：coarse，benzene，hydrotreating，benzene i 目目 录 录 设计说明 I Design d
