共查询到19条相似文献,搜索用时 359 毫秒
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乙酰丙酸乙酯是一种潜在的生物质基平台化合物,在工业上具有很高的应用价值。乙酰丙酸乙酯传统的生产方法主要为间歇反应法,效率较低,产物分离困难且工艺流程较长。因此,本文提出了反应精馏工艺生产乙酰丙酸乙酯,在以中试实验结果为依据的基础上,使用Aspen Plus模拟软件建立了工艺流程,并考察了回流比、进料位置、进料摩尔比以及理论塔板数等关键参数,得到了常规单塔反应精馏工艺生产乙酰丙酸乙酯的最优配置。而后,为了得到纯度大于99.9%的乙酰丙酸乙酯,本文进一步提出了反应精馏双塔精制流程以及反应精馏隔壁塔流程,并通过对两种流程所得到的产品纯度以及能耗的对比,验证了反应精馏隔壁塔工艺生产乙酰丙酸乙酯的有效性以及在节能方面较大的优势。 相似文献
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反应精馏技术及其应用 总被引:3,自引:0,他引:3
反应精馏技术是伴有化学反应的精馏技术,它具在可提高反应的选择性和转化率,降低能耗,节省投资等特点,本文简单介绍了的反应精馏的优点,反应精馏塔的结构及其应用。 相似文献
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针对丙酮缩甘油的传统生产工艺单程转化率低、生产设备投资高、后处理过程长及环境污染等缺点,本文设计了一种高效节能的反应精馏(RD)生产工艺。基于反应动力学和热力学基础数据,建立丙酮缩甘油反应精馏严格数学模型对反应精馏工艺全流程进行理论探究。通过对塔内浓度分布的分析,揭示了产物水对丙酮缩甘油反应精馏合成效果的影响。探究不同丙酮循环量对全流程生产工艺的影响;并以反应精馏塔和丙酮回收塔塔釜再沸器负荷为目标函数,对全流程的参数进行探究和优化,结果表明全流程优化后相比单塔优化的总能耗可节约3.6%。同时与工业传统先反应后精馏流程相比,优化后的反应精馏全流程节约能耗15.1%。该结果可为丙酮缩甘油工业化生产工艺设计提供参考和依据。 相似文献
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简述了酯化反应原理及酯化反应动力学研究进展,提出了酯化反应器应设计为填料塔或板式塔较合适;详细介绍了并流酯化反应工艺与反应精馏工艺流程,比较了两种工艺流程的优缺点及能耗:并流流程的操作弹性大,设备制造简单,但需要设计水洗及干燥设备,蒸汽消耗量大,工艺流程较长;反应精馏工艺流程短,投资减少,但反应精馏塔的设计和制造比较复杂,工艺操作条件严格。 相似文献
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Amornchai Arpornwichanop Kittipong Koomsup Suttichai Assabumrungrat 《Journal of Industrial and Engineering Chemistry》2008,14(6):796-803
The recovery of dilute acetic acid, regarding as a waste stream in many chemical and petrochemical processes, becomes an important issue due to economic and environmental awareness. In this work, a simulation study on the direct utilization of dilute acetic acid to produce n-butyl acetate via esterification with butanol in a reactive distillation is presented by using Aspen Plus. The performance of a hybrid reactive distillation with a pretreatment unit, i.e., a conventional distillation or a pervaporation, is investigated. For a single reactive distillation system, it is found that higher overall energy of the system is required when the concentration of acetic acid is lowered. By considering the enrichment of acetic acid in the reactive distillation column feed from 35 to 65 wt.%, a hybrid pervaporation–reactive distillation requires lower energy than both the conventional distillation–reactive distillation system and the single reactive distillation. 相似文献
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反应精馏过程模拟研究进展 总被引:16,自引:0,他引:16
对均相反应精馏和非均相催化精馏过程的各种模拟计算方法进行了评述,分析了各种算法的优缺点和适用范围,指明了目前研究中存在的不足和今后的发展方向。 相似文献
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By means of water as an extractant, the two-feed and three-feed reactive distillation production processes of methylal are synthesized and analyzed. The effects of water on the methylal reactive distillation (RD) production is investigated. Thermally coupled two-feed and three-feed reactive dividing-wall columns are proposed and analyzed. The two-feed and three-feed RD processes are compared. The three-feed thermally coupled reactive dividing-wall column (DWC) exhibits an outstanding ability of energy and cost savings. Results from this work could be helpful for further development and application of RD or reactive DWC in methylal production. 相似文献
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In this paper,a generalized model of the reactive distillation processes was developed via rate-based approach. The homotopy-continuation method was employed to solve the complicated nonlinear model equations efficiently. The simulation on the reactive distillation processes was carried out with the profiles of stage temperature,composition and flow rate for both vapor and liquid phases obtained. Based on careful analysis of the simulation results, the pitfalls in experimental design were detected. Finally, a software package for the simulation of reactive distillation processes was developed. 相似文献
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E.H. Stitt 《Chemical engineering science》2002,57(9):1537-1543
The potential of reactive distillation for xylenes manufacture via the toluene disproportionation reaction is considered in detail. The conventional process is carried out in the vapour phase over a fixed bed catalyst at elevated temperature and pressure. Process design and flowsheeting were carried out for both the conventional and reactive distillation processes using the Aspen Plus simulation package, specifically using the facility for evaluation of simultaneous reaction and physical equilibrium within a distillation column calculation block. Using the flowsheeting based process and equipment designs, a detailed comparative cost assessment and economic analysis of the two processes was performed. The economic evaluation is equivocal, and the reactive distillation process does not appear to offer significant benefits. While the reactive distillation approach does allow significant flowsheet simplification, the design compromises required to enable simultaneous reaction and distillation, particularly relating to design pressure, negate the inherent process benefits. Further, changes in reaction selectivity between the two reaction environments influenced not only the process product slate but also forced process design features to suppress an unwanted (heavy) by-product. 相似文献
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Ramona M. Dragomir 《Chemical engineering science》2005,60(16):4377-4395
It is well known that reactive distillation offers benefits by integrating distillation and reaction within a single unit. While there are procedures available for the synthesis of non-reactive distillation processes and of reaction-separation systems, the design of reactive distillation columns is still a challenge. This work presents a new synthesis and design methodology for hybrid reactive distillation columns, featuring both reactive and non-reactive sections; reactive equilibrium is assumed. The approach is based on graphical techniques; therefore it is restricted to systems with two degrees of freedom according to Gibbs phase rule. The design method allows rapid and relatively simple screening of different reactive distillation column configurations. The results are useful for initialising more rigorous calculations. The methodology is illustrated for MTBE and ethyl formate production. 相似文献
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从裂解碳五分离聚合级异戊二烯的一段萃取工艺 总被引:3,自引:1,他引:2
裂解碳五两段萃取精馏工艺存在流程长等问题。本文研究了采用反应精馏的一段萃取工艺,确定了二聚过程中的主要反应及其Arrhenius方程。Aspen Plus软件模拟计算结果表明,反应精馏过程与90 ℃下停留3.5 h的热二聚过程相比,异戊二烯聚合损失率减少40.68%,生成的共二聚体降低35.41%,异戊二烯和间戊二烯的自二聚体降低72.29%,环戊二烯二聚的选择性提高。先反应精馏脱除重组分再脱除炔烃可使进入萃取单元的炔烃降低,满足异戊二烯产品中炔烃质量分数小于50×10-6,在萃取和解析过程后通过精馏使环戊二烯质量分数小于1×10-6,得到聚合级异戊二烯产品。本研究提出的一段萃取分离流程短,投资和操作费用低,异戊二烯损失少,再生溶剂要求低。 相似文献
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以甲苯氯化生产氯化苄为研究对象,对带侧反应器的反应精馏与精制塔串联工艺(CSRRT)进行研究及能量分析,建立了分段反应精馏与精制塔串联生产氯化苄的新工艺。利用精制塔塔顶蒸汽潜热加热第一段反应精馏塔的塔釜,建立了多效反应精馏(MERD);进一步利用侧反应器的甲苯氯化反应热加热第一段反应精馏塔的塔板物料,建立了多效透热反应精馏(MEDRD)。在相同生产要求下,对3种工艺的能耗进行比较。结果表明,MERD和MEDRD过程实现了能量的优化利用,与CSRRT过程相比,塔釜总再沸器热负荷分别降低16.8%和33.7%。 相似文献
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