共查询到17条相似文献，搜索用时 546 毫秒
1.
《实验室研究与探索》2017,(2):76-79
采用过程工程的序贯模块法设计并组建了乙二醇连续萃取精馏乙醇-水恒沸物系的实验装置。由UNIQUAC活度系数模型预测汽液相平衡,结合萃取传质动力学MESHRF模型优化设计精馏塔,采用θ环填料和透明塔体组装成溶剂回收、精馏和提馏三段式连续萃取精馏实验装置,将萃取精馏和萃取剂回收双塔流程优化为单塔流程,以便于学生可独立设计和操作。实验结果表明:所研制教学装置能实现恒沸物系的萃取精馏分离,99%乙醇收率达91.6%,萃取剂回收率94.3%。 相似文献
2.
研究了四氢呋喃-乙醇二元物系加入离子液体1-辛基-3-甲基咪唑四氟硼酸盐（[OMIM]BF4）的萃取精馏,考察了不同的回流比、萃取剂流率和萃取剂比对分离效果的影响,确定了最佳工艺条件．实验结果表明,在回流比只=5、萃取剂比30％、萃取剂流率4ml／min时,四氢呋喃的纯度和收率最高． 相似文献
3.
研究了大学物理化学实验中产生的异丙醇-环己烷废液的回收利用方法.先以水为萃取剂,对异丙醇-环己烷混合物进行萃取分离,得到粗环己烷和异丙醇水溶液,粗环己烷经精馏提纯,得到纯度为99.80%环已烷产品;异丙醇水溶液经恒沸精馏得纯度为99.55%异丙醇. 相似文献
4.
实验室异丙醇-环己烷废液回收的研究 总被引：1，自引：0，他引：1
研究了大学物理化学实验中产生的异丙醇-环己烷废液的回收利用方法。先以水为萃取剂,对异丙醇-环己烷混合物进行萃取分离,得到粗环己烷和异丙醇水溶液,粗环己烷经精馏提纯,得到纯度为99.80%环己烷产品;异丙醇水溶液经恒沸精馏得纯度为99.55%异丙醇。 相似文献
5.
DMF萃取精馏法精制乙酸乙酯的过程模拟研究 总被引：1，自引：0，他引：1
本文利用化工流程模拟软件AspenPlus采用萃取精馏,以DMF为萃取剂,对乙酸乙酯生产中的产品精制进行了模拟计算,详细分析了理论板数、进料位置、溶剂比和回流比对产品浓度的影响。结果表明,最优工艺方案为：理论板数40,粗酯进料位置29,萃取剂进料位置6,溶剂比1.6,回流比2.0,塔顶产品乙酸乙酯含量达到99.9%,质量达到GB/T3728-2007优等品标准,为分离过程的优化操作和设计提供依据。 相似文献
6.
以氯仿为萃取剂,选取UNIQUAC相平衡模型,以ASPEN PLUS过程模拟软件对采用萃取-精馏技术回收废水中N,N-二甲基酰胺（DMF）的过程进行模拟计算;讨论了萃取过程的萃取级数、萃取比及精馏过程的回流比、塔板数和进料位置变化对回收过程的影响,优化了DMF废水回收过程中的主要工艺参数;同时对萃取-精馏与普通精馏技术的能耗进行了比较,萃取-精馏技术节约能耗可达80%。 相似文献
7.
8.
9.
利用N-甲基甲酰胺（NMF）作萃取剂,萃取精馏分离醋酸和水混合物。利用Aspen Plus流程模拟软件对分离过程进行了模拟计算,确定了理论板数、加料板位置、回流比、加料比等最佳工艺条件及工艺参数。结果表明,利用NMF作萃取剂可以较好的实现醋酸和水的分离,醋酸的纯度可达99.94%,萃取剂可以循环利用;与普通精馏法相比,相同分离任务下,萃取精馏工艺的再沸器热负荷降低了60.4%,生产每吨醋酸再沸器消耗蒸汽量由7.1吨降低到2.8吨。说明萃取精馏法分离醋酸和水优于普通精馏法,节能效果明显,为工业化装置提供了重要的理论依据和设计参考。 相似文献
10.
该文将化工流程模拟与本质安全有机结合,针对萃取精馏分离乙酸乙酯-甲醇-水工艺进行了化工过程安全仿真实验。通过热力学拓扑理论分析筛选出分离性能较好的溶剂作为萃取剂;基于Aspen Plus流程模拟软件,搭建了三塔萃取精馏过程模型用于分离乙酸乙酯-甲醇-水三元共沸混合物;利用多目标粒子群算法以经济和安全性能作为目标函数对工艺进行优化。该仿真实训实验融合了化工热力学、化工原理和化工工艺热风险及评估等专业课程内容,同时将专业理论知识、前沿学科知识和工程实践应用有机结合,强化专业基本功训练,激发学生研究兴趣,全面提升学生创新能力。 相似文献
11.
Azeotropic liquid mixture cannot be separated by conventional distillation. But extractive distillation or combination of the two can be valid for them. An experiment to separate benzene and cyclohexane by batch extractive distillation was carried out with N,N-dimethylformide (DMF), dimethyl sulfoxide (DMSO) and their mixture as extractive solvent. The effect of the operation parameters such as solvent flow rate and reflux ratio on the separation was studied under the same operating conditions. The results show that the separation effect was improved with the increase of solvent flow rate and the reflux ratio; all the three extractive solvents can separate benzene and cyclohexane, with DMF being the most efficient one, the mixture the second, and DMSO the least. In the experiment the best operation conditions are with DMF as extractive solvent, the solvent flow rate being 12.33 mL/min, and the reflux ratio being 6. As a result, we can get cyclohexane from the top of tower with the average product content being 86.98%, and its recovering ratio being 83.10%. 相似文献
12.
13.
The pulse-control operation technique which alternates between total reflux operation and total efflux operation in batch distillation was studied along with the minimum amount of slop cut. Total reflux time was confirmed by dynamic simulation, and total efflux time was adopted by statistic method. For the mixture of hexane and cyclohexane and the traditional constant reflux ratio operation strategy, the amount of slop cut is 1.8-2.1 times of the minimum amount of slop cut; whereas for the pulse-control operation strategy, it is 1.2-1.4 times of the minimum amount of slop cut. So compared with the traditional constant reflux ratio operation, the pulse-control operation can decrease the amount of slop cut and operation time, and meanwhile, enhance separation efficiency and yield. 相似文献
14.
The separation of ternary methanol/methyl butyl ether/1-butylchloride mixtures was investigated, which are the main components of the waste liquid. After preliminary studies on the ternary system, the integrated process of extraction and distillation was put forward to separate the ternary system. The results show that methanol carl be removed from the mixtures by extraction using water as the extracting agent. Through distillation of extract and dried raffinate respectively, methanol, methyl butyl ether and 1-butylchloride can be separated and recovered. In addition, the optimal volume for the extracting agent and effects of reflux ratio on the yield of product were also studied. The optimal volume ratio of the extracting agent to material is 1： 3.5, and the yield of the product increases with the increase of reflux ratio. 相似文献
15.
16.
The batch extractive distillation (BED) process has the advantages of both batch and extractive distillation. It is one of the most promising means for the separation of azeotropic and close-boiling point systems. However, so far this process has not been applied in industry due to its over-complexity. A new shortcut model was proposed to simulate the operation of the batch extractive distillation operations. This algorithm is based on the assumption that the batch extractive distillation column can be considered as a continuous extractive distillation column with changing feed at any time. Namely, the whole batch process is simulated as a succession of a finite number of steady states of short duration, in which holdup is considered as constant mole. For each period of time the batch extractive distillation process is solved through the algorithm for continuous extractive distillation. Finally, the practical implementation of the shortcut model is discussed and data from the laboratory and literature are presented. It is found that this model has better adaptability, more satisfactory accuracy and less calculative load than previous rigorous model. Hence the algorithm for simulating BED is verified. 相似文献
17.
精馏和反应过程的节能,对于减少能源消耗,降低生产成本和保护环境具有十分重要的意义。在精馏过程中可以采用最适宜回流比操作,采用最佳进料状态,使用中间冷凝器和中间再沸器,高效精馏、热泵精馏。合理安排多组分物料分离流程,直接利用过程热量及开发应用高效换热器等措施。在反应过程中应重视反应途径的合成,反应器的合理选择和高效反应器的设计开发、适宜反应条件的选取和优化等问题。 相似文献