甲乙酮工艺的模拟与优化.pdf

天津大学
硕士学位论文
甲乙酮工艺的模拟与优化
姓名:徐丽梅
申请学位级别:硕士
专业:化学工程
指导教师:李士兩
20090601
摘要
甲乙酮是一种优良的有机溶剂,具有广泛的工业应用。国内主要采用正丁烯
步氧化法生产甲乙酮,包括丁烯提浓、水合反应、仲丁醇提浓、甲乙酮合成四
个工段。该方法的模拟模型尚不成熟,因而,在设计及操作方面多依据于经验。
本文利用 Aspen Plus开发了甲乙酮工艺流程模拟模型,选择出合适的物性方
法及热力学模型(NRTL),并采用UNIF-DMD方程提供缺少的二元交互作用参
数来对NRTL加以修正。模拟值与文献及现场生产数据吻合良好,可以作为工业
工艺改造的参考。
为了节能降耗,本文对甲乙酮萃取精馏流程进行了重点研究。使用所建立的
模拟模型,分析了溶剂比、回流比、溶剂组成等操作条件对节能效果的影响,以
得到优化操作条件。结果表明,在满足工艺分离要求的前提下,优化的操作参数
与原操作参数相差不大,溶剂比由13.3减小到13.0,回流比由0.7738调节到0.7。
在此参数下操作,能耗仅降低了3.43%。表明原工艺通过操作优化节能的潜力不
大
本文结合萃取精馏技术的新进展提出了采用隔板塔改造原萃取精馏流程的
新方案,并对其进行了模拟研究,考察了溶剂比、回流比、碳四原料与N-甲酰
吗啉-甲乙酮混合溶剂进料位置、分配比对新工艺的影响,得到一组优化参数。
模拟结果表明,在此优化条件下操作,正丁烯含量由97.65%增大到97.83%;再
沸器所需能耗下降了19.80%,冷凝器节能19.76%,总能耗由15347.02kW降低
到12309.87kW,降低19.79%。此外,新工艺的溶剂比由13.3降低至11,降低
了操作费用。
关键词:甲乙酮;萃取精馏;隔板塔;模拟
ABSTRACT
MEK (Methyl Ethyl Ketone)is an excellent organic solvent and is widly utilized
in industries In China, most companies produce MEK with two-step butene oxidation
method which includes the following four steps: butene stripping, synthesizing of
SBA (secondary butyl alcohol), SBA refining, and MEK synthesizing and refining
The key problem in the above technology is lack of model, so the design and
operation are strongly based on experience
this study, MEK simulation model was established with Aspen Plus. Proper
physical property methods and thermodynamic model(NRTL were selected, some
missing binary interaction parameters were estimated with UNIF-DM D model
Simulation results showed that the model had made a good match with the published
ndustrial data
In order to save energy and reduce cost, the extractive distillation process in the
whole flowsheet was paid more attention by the author. Some operating condition
such as solvent/feed ratio, reflux ratio, solvent composition, were checked with the
established model and then a series of optimized parameters were obtaine
Compared with the original parameters, the optimized parameters only changed a
little, as the solvent ratio decreased from 13.3 to 13.0, and reflux ratio adjusted from
0.7738 to 0. 7. The simulation results showed that there was little energy saving
potential in the original technology
A new process of extractive distillation--dividing Wall Extractive Distillation
Column (DWC-E)was studied too, and the simulation model was established
simutaniously. Some operation conditions, such as solvent/feed ratio, reflux ratio, the
location of a feed stream and N-formyimorpholine-mek mixed solvent stream and
distribution ratio, were studied for the energy efficiency optimization purpose. Finall
a set of optimized parameters were obtained. By comparison with the current
technology, the DWC-E got the increasing of butene composition from 97.65% to
97.83%, the decreasing of energy consumption of the reboiler and condensers b
19.80% and 19.76%, respectively. The total energy consumption decreases from
15347.02 to 12309.87(w), saving 19.79%, and solvent/feed ratio of the new
technology is reduced from 13.3 to 11. The operating costs decreased apparently
KEY WORDS: MEK; Extractive Distillation; Dividing Wall Column: Simulation