共查询到17条相似文献，搜索用时 578 毫秒
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本文对筛板精馏塔的性能进行全面的测试,主要对低浓度乙醇精馏过程中的不同实验操作条件进行探讨,得出了塔釜浓度、回流比、进料量、进料位置等与全塔效率的关系,确定了该筛板精塔的最优实验操作条件。 相似文献
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山苍子油多段连续减压精馏提取柠檬醛工艺 总被引：1，自引：0，他引：1
研究多段连续减压精馏山苍子油提取柠檬醛的生产工艺,通过正交实验分析不同操作条件（回流比、塔顶温度和塔釜温度）下所得柠檬醛产品的浓度与得率,得出了该实验流程精馏塔系统的塔顶温度和回流比的控制对产品纯度有显著影响.维持较高的系统绝压为666.612～2 666.447Pa时,阻聚剂和抗氧化剂的添加量最少应达0.3%,可获得该实验系统提取柠檬醛的较佳工艺条件.基于该文原料油生产的柠檬醛纯度最高达95%,得率65%. 相似文献
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二甲醚生产过程甲醇回收塔的计算机优化 总被引：2，自引：0，他引：2
采用Aspen Plus模拟软件对DME生产流程进行了模拟,并对甲醇回收精馏塔的操作条件进行了优化。结果发现,当塔顶压力为1．3bar,塔底压力为1．6bar时,优化计算得到最佳理论板数为25,最佳回流比为1．22,最佳进料塔板为17。在最佳条件下操作。甲醇回收率为99．95％,甲醇纯度为99％以上,达到了优化目标。通过优化,减少了理论板数,可减少设备投资;降低了塔的回流比,可降低操作费用。 相似文献
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气相甲醇合成二甲醚生产过程优化研究(Ⅰ)--二甲醚分离塔的计算机优化 总被引：2，自引：0，他引：2
龚盛昭 《广东轻工职业技术学院学报》2004,3(1):6-8
采用AspenP1us模拟软件对二甲醚（DME）生产流程进行了模拟,并对DME分离塔的操作条件进行了优化。当塔顶压力为8．3bar,塔底压力为8．5bar时,计算得到最佳理论板数为20,最佳回流比为0．521,最佳进料塔板为8。在最佳条件下操作,DME回收率为99．8％,DME纯度为99．95％以上,达到了优化目标。 相似文献
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利用Aspen Plus软件,在NRTL-HOC热力学条件下,以对二甲苯(PX,下同)为夹带剂,进行稀醋酸提浓的共沸精馏模拟。经过全流程优化计算,获得了共沸精馏模拟分离的最佳操作参数：塔底物质的量馏出比(塔底出料物质的量流量与原料液与夹带剂进料物质的量流量总和比,下同)为0.251,全塔40块理论板,稀醋酸从第23板进料,夹带剂从第2块板进料,较佳的物质的量回流比为4.4,较佳的进料比(夹带剂与稀醋酸进料质量流量比,下同)为0.8。在最佳操作参数下,共沸精馏分离出醋酸的质量浓度高达99.99%,水的质量浓度高达99.72%,该工艺中醋酸质量回收率高达99.82%,水的质量回收率高达99.98%,塔釜的热负荷为1852.86 kW,满足分离要求。 相似文献
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通过对精馏实验设备进行改造,在每套设备上安装了回流温度测定装置,并要求学生在冷液回流的操作条件下进行精馏试验,自己设定回流温度、进料热状态、回流比等实验参数,通过对精馏过程的物料衡算和热量衡算,确定精馏塔的内回流量及精馏段操作线方程,并进行精馏分离效果的分析。 相似文献
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吴海霞 《洛阳师范学院学报》2010,29(2):62-63,75
MTBE(甲基叔丁基醚)与异丁烯联合生产装置中的MTBE精制塔冷凝器换热管容易结垢,影响精制塔的操作.防止凝器换热管结垢是该装置面临的一大难题.本文分析了冷凝器结垢的原因,通过理论计算及试验,设计出一种防止换热管结垢的冷凝器. 相似文献
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连续精馏实验影响因素关系测定 总被引：1，自引：0，他引：1
采用甲醇-丙酮物系进行实验,通过改变回流比以及进料液流速这两个条件,观察分析分离效果,总结出连续精馏实验影响因素的关系以及实验室连续精馏的最佳操作条件.随回流比的增大,塔顶馏分的浓度的变化关系是先增大再降低.随进料液流速的增大,塔顶馏分的浓度变化是逐步增大,增大到一定值就基本维持平稳不变.最佳操作条件是回流比R=3,进料液流速=6ml/min.在此操作条件下甲醇丙酮的分离效果最佳. 相似文献
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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
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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
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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
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分别用浸泡法、加热回流萃取法从芒果树叶中提取天然缓蚀剂,并采用失重法、极化曲线法研究各种方法的提取物在室温下酸性介质中对A3钢的缓蚀性能。实验结果表明,两种方法所得植物缓蚀剂均属于混合型缓蚀剂,其中加热回流萃取法所得缓蚀剂缓蚀效果较优,缓蚀率最高可达90.11%。 相似文献
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To investigate the seismic behavior of specially shaped column joints with X-shaped reinforcement,two groups of specimens with or without X-shaped reinforcement in joint core region were tested under constant axial compression load and low reversed cyclic loading,which imitated low to moderate earthquake force.The seismic behavior of specially shaped column joints with X-shaped reinforcement in terms of bearing capacity,displacement,ductility,hysteretic curve,stiffness degradation and energy dissipation was studied and compared to that without Xshaped reinforcement in joint core region.With the damage estimation model,the accumulated damage was analyzed.The shearing capacity formula of specially shaped column joints reinforced by X-shaped reinforcement was proposed with a simple form.The test results show that X-shaped reinforcement is an effective measure for improving the seismic behavior of specially shaped column joints including deformation behavior,ductility and hysteretic characteristic.All specimens were damaged with gradual stiffness degeneration.In addition,X-shaped reinforcement in the joint core region is an effective way to lighten the degree of cumulated damage.The good seismic performance obtained from the specially shaped column joint with X-shaped reinforcement can be used in engineering applications.The test value is higher than the calculated value,which indicates that the formula is safe for the design of specially shaped column joints. 相似文献
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《天津大学学报(英文版)》2017,(6)
As a kind of aerobic bacteria, Saccharopolyspora spinosa exhibits a high demand for oxygen. In the fermentation process, the methods of increasing ventilation and improving agitation speed are usually adopted to achieve higher values of dissolved oxygen. These methods decrease the efficiency of spinosad biosynthesis.In this study, an improved reactor was designed to solve these problems. The exhaust gas reflux device, impellers,and baffles were improved. Furthermore, we established the kinetic models for the cell growth, substrate consumption and spinosad generation in batch fermentation process. The simulation results were in good agreement with the experimental data. Spinosad production reached 583.86 mg/L after employing the suitable feeding strategy by fed-batch fermentation in the improved reactor, whereas it was only 157.01 mg/L before optimization. The method described can provide insight to strengthen spinosad production and can be extended to the culturing process of filamentous aerobic bacteria. 相似文献