分离混合二甲苯的对二甲苯-间二甲苯混合生产工艺的模拟-学兔兔 www.xuetutu.com.pdf

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石油化工
PETROCHEMICAL TECHNOLOGY
2015年第44卷第2期
分离混合二甲苯的对二甲苯一间二甲苯
混合生产工艺的模拟
刘肖肖,许新望,王丽军,成有为,李希
(浙江大学化学工程与生物工程学系,浙江杭州310027)
摘要」在结晶热力学分析的基础上,提出用于分离混合二甲苯的对二甲苯ー间二甲苯(PX-MX)混合生产工艺,并建立数学
模型进行模拟。考察了精馏塔理论塔板数、精馏塔顶采出量与进料量的摩尔比(精馏塔采出比)和结晶温度对PX-MX混合产
品回收率( YMNPX)及产品中MX与PX摩尔比的影响,并对4种混合C芳烃原料进行全流程模拟。模拟结果表明,在精馏塔理论
塔板数为50、精馏塔采出比为0.8、结晶温度为高于各进料条件下PX-MX-OX三组分共晶温度5K时,4种混合C芳烃为原料通
过PX-MX混合生产工艺分离,均可获得含量大于9.9%(x)的PX-MX混合产品, Yunak最高可达61.55%,PX回收率最高可达
84.77%:同时省去MX单组分提纯过程,可降低生产成本。
L关键词」过程模拟;精馏-结晶;对二甲苯;间…甲苯;混合二甲苯
文章编号]1000-8144(2015)02-0168-07
中图分类号]TQ021.8
[文献标志码]A
Simulation of the Production Process of Mixed -Xylene and m-xylene from Mixed Xylenes
Liu Xiaoxiao, Xu inwang, Wang Lijun, Cheng Youwei
( Department of Chemical and Biochemcal Engineering, Zhejiang University, Hangzhou Zhejiang 310027, China)
Abstract A production process for mixed p-xylene(PX )and m-xylene(MX)was proposed and
simulated based on crystallization thermodynamics. The effects of number of theoretical plates, mole
ratio of distillate to feed in distillation column and crystallization temperature on the yield of the mixed
Px-mx(Mxpx)and ratio of MX/PX were investigated. The process simulation was carried out for
4 kinds of C, raw materials. The results showed that. under the conditions of number of theoretica
plates of distillation column 50, mole ratio of distillate to feed 0.8 and crystallization temperature 5
K higher than the eutectic temperature of PX-MX-OX, the purity of the mixed PX and MX products
could reach more than 99.9%0(x) for the Cs raw materials, and both Ymxpx and the yield of PX in the
products could reach the maximum, 61. 55% and 84. 77%o, respectively. Furthermore, the recovery
of MX from mixed ylenes can be realize, which mits the M purification process to reduce the
production cost
I Keywords process simulation; distillation-melt crystallization; P-xylene; m-xylene; mixed
xylenes
对苯二甲酸(PTA)和间苯二甲酸(PIA)为重为吸附剂的损耗及更换使得生产成本较高,对于
要的化工基础原料,主要用于生产聚酯纤维和瓶生产规模较小的MX装置显得尤为不经济3。聚
片
目前,PTA和PIA均采用高纯度的单体原酯生产过程中PIA的主要用途是与PTA进行共聚
料通过分别氧化获得。国内外广泛采用吸附法制备使用时要求二者充分混合5-?。因此,如果能直接
高纯度的对二甲苯(PX)和间二甲苯(MX),但因利用混合二甲苯原料而不是其高纯度单组分物质
收稿日期]2014-08-19;[修改稿日期]2014-11-03。
作者简介]刘肖肖(1990-),女,河南省驻马店市人,硕士生,电话0571-87952210,电邮21228060@zju.edu.cn。联系人:王丽
军,电话0571-87952210,电邮 wang lijun(@zju.ecdu,cn