【作者】 金彦；

【导师】 张述伟；

【作者基本信息】 大连理工大学 ， 化学工艺， 2006， 硕士

【摘要】 三乙烯二胺是聚氨酯工业中应用最广,用量最大聚氨类催化剂。近年来聚氨酯泡沫塑料发展十分迅速,其产量已在聚氨酯中占到80%,随着应用范围的日渐广泛,对催化剂三乙烯二胺的需求亦会大幅度增加。工业催化教研室研究出制备三乙烯二胺新方法,具有较高的选择性,研究其产物的分离设计与模拟,进行可行性分析,有助于将其投入工业生产,实现工业化。 ASPEN PLUS是美国ASPEN技术公司的先进流程模拟软件,采用此软件进行流程模拟,为企业提供准确的单元操作模型,可以大大提高模拟效率,还可以进行已有装置的优化操作或新建、改建装置的优化设计。 本文以ASPEN PLUS软件为工作平台,采用严格精馏塔操作单元,并以NRTL和ELECNRTL热力学方程物性计算方法对三乙烯二胺的分离纯化工艺流程进行了模拟,用ASPEN PLUS的Property Estimation(性质估计)对两种未知物质的物性做了有效准确的估计,给出了相应的工艺参数。通过直观推断法和调优法得出要研究的四个精馏序列,以能耗和设备费用为目标函数对它们进行了研究。在模拟过程中重点考察了模拟过程中塔板数、进料位置和塔顶采出量等参数的变化对整个模拟计算结果所产生的影响。经过分析得出最优的分离序列,可以得到97.86%质量浓度的哌嗪和哌嗪衍生物的混合产品及96.57%质量浓度的三乙烯二胺。 一些工艺物流需要加热,而另一些工艺物流则需要冷却,把这些物流匹配在一起,充分利用热物流去加热冷物流,提高过程的热回收率,对分离序列进行热集成研究。采用夹点分析法和问题表格法对分离序列进行换热网络综合,获得更加节省能量的热集成分离工艺流程,节省能量达48.29%。更多还原

【Abstract】 Triethylenediamine is not only the most widely used but also the largest demanded polyammonia catalyst in the area of polyurethane industry. Recently, polyurethane foam develops quite rapidly, which occupies approximately 80% in the overall polyurethane products. With the application area becoming larger, the demand for catalyst triethylenediamine increases drastically. Industry catalysis research institute develops a new method of making triethylenediamine, which has a relatively higher selectivity. The researches on the design, simulation of the separation process of the reaction products and the analysis of the feasibility, are quite helpful to put this method into industrial production and realize industrialization.Software-ASPEN PLUS is an advanced software for process simulation which is produced by ASPEN Co. in America. Using this software to simulate the process, accurate unit operation models can be provided for enterprises . It can not only increase simulation efficiency but also can evaluate the operation of the original equipment and reconstruct, remodify the original equipment to reach a most excellent design.Software ASPEN PLUS is chosen as the working platform in this article, strict distillation tower operation unit is adopted. The NRTL and ELECNRTL thermod ynamic equations are used to simulate the process of separating and purifying triethylenediamine.The function of property estimation within software Aspen Plus is used to estimate the physical property of two unknown substances effectively and accurately. Consequently, reasonable technological parameters are obtained. Choosing energy consumption and equipment consumption as the objective functions, four distillation separation sequences are chosen based on the methods of direct deduction and optimization. Some important parameters such as the number of the plates, feed stage and flow rate of overhead product are studied during the simulation process. The effect of the changing of those parameters on the whole simulation process is also studied. The best separation sequence is chosen through analysis. The mass fraction of Piperazine, 2MP, NEP is 97.86% and triethylenediamine’s mass fractionis 96.57% through the treatment of it.Some technical streams need to be heated while others need to be cooled. Mixing those streams together and completely using hot streams to heat cool streams to enhance the heatrecycling rate. At the same time, the separation sequence’s heat integration is studied. Pinch technology and Problem Table are adopted to study heat exchange network of the separation sequence. More energy saving separation technical process is obtained. Energy saving can be reached 48.29%.更多还原