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利用Aspen Plus模拟软件对完全热集成变压精馏分离甲酸和水的过程进行了模拟,选用NRTL-HOC物性计算模型,模型的二元交互作用参数通过实验数据进行回归。在完全热集成下,分析了理论板数、回流比及进料位置对产品质量分数和塔釜能耗的影响。确定了较佳工艺条件:减压塔理论板数为34,回流比为7,原料和循环物料进料位置分别为第6和第14块塔板,塔顶甲酸质量分数为0.991;常压塔理论板数为32,回流比为8.6,进料位置为第17块塔板,塔顶水质量分数为0.994。与传统变压精馏比较,完全热集成变压精馏降低加热蒸汽能耗48.6%,冷凝水能耗48.9%,且无需附加再沸器或冷凝器。通过间歇变压精馏实验,验证了工艺的可行性。 相似文献
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在精馏计算中,用状态方程求汽液平衡有所需参数少,能适应超临界或处于临界区域的组份,能由此算出焓差△H及体积V等优点;其缺点为对强非理想溶液(液相) 不甚适应。状态方程有多种形式,作为有别于以活度系数模型求汽液平衡的一个类型,特介绍本文。本文以Peng—Robinson模型计算汽液平衡,并提供了计算程序。 相似文献
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引言
醋酸/水体系的直接精馏是一个非常特殊的汽液分离过程,这里所述的直接精馏指的是普通精馏而非共沸精馏或萃取精馏。该体系在精馏操作过程中不仅具有严重的腐蚀性,因而要求较高标号的设备用材,而且需要较多的理论塔板数,以实现较高的分离要求。尤其是在塔上部至塔顶部分, 相似文献
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《化学工程》2016,(8):15-19
采用废剥离液为原料,选择NRTL热力学方法,根据设计指标确定了工艺流程:先蒸发脱除重组分,再进脱轻塔脱除轻组分,最后在成品塔中完成精制。选择两塔的理论板数作为操作变量,应用均匀设计试验原理确定了7组试验条件,又通过流程模拟软件对所建立的模型进行了计算。选择1st Opt软件数据处理系统进行多项式逐步回归分析得到操作变量与投资成本、运行成本和项目总成本之间的数学模型关系,同时利用遗传算法进行了优化,并得到项目总成本最低时的模型参数为:脱轻塔理论塔板数X1=6,成品塔理论板数X2=10。根据优化结果,进行了蒸发器和精馏塔的水力学计算与优化设计,设计出满足要求的剥离液精馏工艺成套装置,并在实际开车过程中,产品的水分含量为0.08%(质量分数),且产品收率达到93.3%,均高于设计指标。 相似文献
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<正>1IBAU型生料均化库介绍我水泥公司5000t/d熟料新型干法水泥生产线的生料均化库,采用的是Φ22.5m×48m的新型IBAU型均化库,有效储量16000t,有效储期2.090d。该生料均化库是集生料储备、均化和喂料于一体,且有均化效果好、电耗低、系统简单、操作管理方便等优点。该库的特点是库底中心设有一个大圆锥,通过 相似文献
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采用化工流程模拟软件ASPEN PLUS对VCM精馏工段各精馏塔进行模拟计算,并对操作变量进行灵敏度分析,可得到适宜的进料位置、回流比及馏出比,为氯乙烯精馏工段的操作优化提供依据。 相似文献
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Chang Seok Ki Ki Hoon Lee Doo Hyun Baek Masahiro Hattori In Chul Um Dae Woo Ihm Young Hwan Park 《应用聚合物科学杂志》2007,105(3):1605-1610
Regenerated silk fibroin (SF) filaments could be prepared by wet spinning in common solvent/coagulation system. SF was directly dissolved in mixture solvent of phosphoric acid and formic acid (20/80–30/70 ratio) and coagulated in methanol bath. The concentration and stability of SF dope solution have been studied by varying the mixture ratios of these solvents in accordance with elucidating the role of formic acid in the mixture solvent system. Morphological structure as well as crystalline structure of the regenerated filament was examined using SEM and XRD analyses. As a result of tensile test, the regenerated SF filament, which was made by one‐step dissolution and coagulation process, had good mechanical properties, 2.3 gf/d tenacity and 18% breaking strain. In this study, a simple wet spinning method which enables to apply to practical production has been reported for the preparation of the regenerated SF filament. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
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The enrichment of formic acid in dilute solution was achieved by complex extraction method. An extraction system with high partition coefficient was determined. The continuum model was then applied for describing mass transfer process and predicting the mass transfer characteristics in O/W system. The rate-limiting step was determined to be mass transfer of formic acid in aqueous phase, by comparison of mass transfer rates between extractant in organic phase and solute in aqueous phase. The effect of dispersion size of organic droplets on mass transfer characteristics in O/W systems was determined, indicating inefficient extraction process with low mass transfer coefficients and surficial area in O/W systems. Inert gas was introduced into extraction system and a G/O/W system was developed. The calculation of mass transfer performance in G/O/W system indicates the addition of microbubbles effectively enhances the mass transfer process. Also, suitable volumetric fraction of inert gas was optimized. According to the calculation, a double-membrane-dispersion-device was designed, with which G/O/W double emulsion was prepared and effective enrichment of formic acid from its dilute solution was realized. 相似文献
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详细分析了盐酸解吸系统运行过程中的不稳定因素,并进行了技术改造,包括浓盐酸上酸系统、氯化钙过料管线及冷却器下酸工艺改造,并对相应设备和管道进行了优化,改造后装置运行平稳,可回收氯化氢17 800t/a。 相似文献
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