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指出了芳烃异构化反应系统采用冷高分工艺时存在的不足,提出了改用热高分工艺进行生产的方案,并分析了该技改应用的可行性。 相似文献
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分析了芳烃异构化反应系统多采用的冷高分工艺在能源利用方面存在不合理的现状,提出了改用热高分工艺进行生产的方案并对该技改应用的可行性进行了分析。 相似文献
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芳烃异构化反应主要作用是在临氢条件下通过双功能催化剂进行反应,将贫PX的C8芳烃转化为近似平衡浓度C8芳烃,从而为吸附分离装置提供含较高PX浓度的C8芳烃进料。本文致力于利用Petro-SIM软件进行芳烃异构化反应的模拟及应用,并发现适当减少异构化反应系统后的脱庚烷塔顶的甲苯含量有利于降低C8芳烃收率损失。 相似文献
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通过对C8芳烃异构化反应机理的分析.异构化反应温升与反应产物中非芳烃增量密切相关,是异构化反应温度和压力共同作用的宏观表现.能直接反映异构化反应情况。对减少C8芳烃加工损失,生产负荷调整,保证对二甲苯质量要重指导作用。 相似文献
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将滑动平滑滤波器与滑动窗递推PLS(MW-RPLS)模型结合,开发了一种滑动平均递推PLS(MA-RPLS)模型。将所开发的模型应用于芳烃异构化过程建模中。仿真结果表明:经滑动平滑滤波器去噪后的MA-RPLS模型提高了对二甲苯(PX)含量的预测精度,且各项精度指标均优于MW-RPLS模型。 相似文献
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八碳芳烃临氢异构化反应动力学模型 总被引:1,自引:1,他引:1
针对某实际工业异构化装置,在已开发的八碳芳烃临氢异构化反应网络的基础上,将系统中的八碳环烷烃和八碳链烷烃作为一个集总组分,提出新的六组分异构化反应网络,由此建立了适用于工业生产的八碳芳烃临氢异构化反应动力学模型.考虑结焦对催化剂活性的影响,提出了一种经验形式的催化剂失活函数,能够合理地描述催化剂失活过程.采用四五阶Runge-Kutta法对模型方程进行数值求解,基于多套稳态平衡数据采用差分变尺度优化算法(BFGS)对动力学参数进行估计,进而在不同操作条件下对模型进行验证.结果表明估计值与工业标定值相当吻合,达到了工业应用的模拟精度要求. 相似文献
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碳八芳烃异构化催化剂的性能对比及应用 总被引:1,自引:0,他引:1
对石油化工科学研究院SKI-100系列和UOP公司I-300碳八芳烃异构化催化剂的性能和反应参数进行了对比研究,结合洛阳石化芳烃联合装置扩能改造的客观情况进行了分析,选择了石科院的SKI-100系列催化剂改造异构化单元,并对使用该催化剂改造结果进行了探讨. 相似文献
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选用独特结构的分子筛材料为酸性组元,制备了新型碳八(C8)芳烃异构化催化剂,并对该催化剂的异构化能力进行了研究。选取目前工业用催化剂作为对比催化剂,采用相同的反应原料,在各自最佳的反应条件下,与新型催化剂进行比较。实验结果表明,随着原料的不同,在反应产物中,新型催化剂反应中的对二甲苯在二甲苯中的浓度为19.06%~24.14%,乙苯转化率为32.07%~41.50%,C8烃收率为97.08%~99.11%,远高于对比催化剂;同时,甲苯含量为0.26%~1.20%,重芳烃含量为0.22%~0.62%,远低于对比催化剂。同对比催化剂相比,新型催化剂具有较高的异构化活性和选择性,能在较高的空速下运行。 相似文献
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Thermal isomerization of (all-E)-lycopene and the separation of generated Z-isomers were conducted using a low boiling solvent, dimethyl ether (DME). Because of the low boiling point (–24.8°C), DME is easily separated from lipids and other residues and is extremely low residual. The efficiency of thermal Z-isomerization of (all-E)-lycopene in DME was almost equivalent to using hexane. The thermally generated lycopene Z-isomers were separated by utilizing the solubility differences among lycopene isomers and a characteristic of DME that allows the solubility of compounds to be controlled by changing the temperature. Finally, a lycopene mixture containing 72.0% Z-isomers was obtained from (all-E)-lycopene. 相似文献
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高纯度酒精广泛应用于食品、医药和石油化工等行业,国内外制备高纯度酒精的常用方法为酒精五塔精馏,但传统酒精精馏工艺往往伴随高能耗与高成本。为了解决上述问题,本文提出一种精馏-吸附-膜分离耦合新工艺,从乙醇发酵液中高效获得高纯度酒精。借助Aspen Plus流程模拟软件对精馏-吸附-膜分离耦合工艺进行研究,并用灵敏度分析工具对其精馏塔部分进行参数优化。结果表明,当精馏塔的塔板数为37、回流比为9、进料位置为第35块塔板、吸附剂采用天然沸石、膜分离用聚偏氟乙烯渗透汽化膜时,乙醇质量分数达到99.2%,乙醇回收率为65.6%。与传统五塔精馏方法相比不仅能获得高纯度酒精,而且能耗与设备成本相对较低,也充分提高了空间利用率,具有很好的工业前景。 相似文献
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The effect of isomerization of N,N′‐bisitaconimido‐4,4′‐diphenyl ether to the corresponding biscitraconimide on the curing characteristics and thermal stability of cured resins is described. Resins having bisitaconimide:biscitraconimide ratios of 23:77–93:7 were prepared by reacting 4,4′‐diaminodiphenyl ether with itaconic anhydride in solvents of different polarities and under different reaction conditions. Resins containing a higher proportion of citraconimide had a lower melting point (191 vs 208 °C). The curing exotherm was observed immediately after melting in all the resins and exothermic peak temperature reduced with increase in citraconimide content. Resins having a higher proportion of citraconimide on isothermal curing (200 °C, 2 h) and subsequent heating in nitrogen atmosphere degraded at a slightly lower temperature. However, the char yield at 800 °C did not show any systematic dependence on citraconimide content. © 2002 Society of Chemical Industry 相似文献
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异构化是芳烃生产中的重要环节,提高异构化环节的建模和优化效率对工业生产有着重要意义。但是,直接使用机理模型的优化过程耗时较长,优化效率低。代理模型可以有效地对机理模型进行近似,而代理模型采样方法对模型精度有很大影响。提出了一种新的基于稀疏度和最邻近期望的自适应采样算法,该方法可以平衡全局搜索和局部搜索,通过求解优化问题找到反映函数关键信息的新采样点,再加入原始样本集中,使得代理模型精度不断提高。多个测试函数结果表明,相比于其他自适应采样算法,该算法能有效提升代理模型精度和建模效率。该算法在芳烃异构化环节代理模型中也得到了有效验证,与本文中其他算法对比,该算法模型误差减少5%以上,建模时间缩短30%以上。 相似文献
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热循环吸附装置的初步氢同位素分离 总被引:2,自引:0,他引:2
设计建立了热循环吸附法(TCAP)氢同位素分离实验装置,并通过初步实验验证其分离性能。分离柱为双排圆形排列钻孔管结构,总长度约16 m,封装涂钯氧化铝1 558 g。全回流模式的初步实验结果显示,该分离实验装置可有效实现氢同位素分离,全回流模式下,分离柱热/冷循环温度为150℃/10℃,体积分数50.7%H2—49.3%D2的混合气体经30个循环后,柱底部的氘丰度达到98.8%,顶部氕丰度达到98.4%。初步实验结果表明,该分离装置可有效实现氢同位素分离。 相似文献
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Elnaz Shahbazali Emilie M. F. Billaud Arash Sarhangi Fard Jan Meuldijk Guy Bormans Timothy Noel Volker Hessel 《American Institute of Chemical Engineers》2021,67(1):e17067
Liquid-phase adsorption has hardly been established in micro-flow, although this constitutes an industrially vital method for product separation. A micro-flow UV-photo isomerization process converts cis-cyclooctene partly into trans-cyclooctene, leaving an isomeric mixture. Trans-cyclooctene adsorption and thus separation was achieved in a fixed-bed micro-flow reactor, packed with AgNO3/SiO2 powder, while the cis-isomer stays in the flow. The closed-loop recycling-flow has been presented as systemic approach to enrich the trans-cyclooctene from its cis-isomer. In-flow adsorption in recycling-mode has hardly been reported so that a full theoretical study has been conducted. This insight is used to evaluate three process design options to reach an optimum yield of trans-cyclooctene. These differ firstly in the variation of the individual residence times in the reactor and separator, the additional process option of refreshing the adsorption column under use, and the periodicity of the recycle flow. 相似文献
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精馏-膜分离集成过程与传统精馏工艺相比,因其具有明显节能降耗的经济性优势,故工业应用日渐增多,所以对其进行全面研究更有理论和实际意义。本文介绍了膜分离的机理模型,根据膜的亲水性和亲有机性对膜材料进行分类,总结了精馏-膜分离集成过程的理论研究方法,并分别从脱水和脱有机物两方面介绍了精馏-膜分离集成过程的主要实验研究及工业应用研究进展。通过对现有研究分析发现,目前该集成过程在膜材料和集成优化理论研究方面存在一定局限性,使其未能在工业上得以广泛推广应用。基于上述全面分析,提出了一定改进思路。 相似文献
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Enantioseparation of chiral aromatic acids in process intensified liquid–liquid extraction columns
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Alexander Holbach Julia Godde Ramanan Mahendrarajah Norbert Kockmann 《American Institute of Chemical Engineers》2015,61(1):266-276
Enantioselective liquid–liquid extraction (ELLE) is a powerful alternative to common technologies for separation of racemic mixtures. The first application of ELLE for aromatic acids in liquid–liquid extraction columns is described. The ELLE is investigated experimentally and theoretically for phenylsuccinic acid (PSA) as a representative for aromatic acids. A racemic mixture of (R/S)‐PSA is separated with hydroxypropyl‐β‐cyclodextrin as selector molecule. The ELLE obtained the highest operative selectivity (αop = 1.8–2) for low pH‐values and temperatures. Because of the low operative selectivity, a countercurrent process is necessary to separate both enantiomers completely. The countercurrent process is investigated in process intensified extraction columns (Øin = 15 mm) with a high number of equilibrium stages. The experiments demonstrate a good symmetric separation with an enantiomeric excess of 60% and yields of 80% for both enantiomers. Finally, the back extraction is investigated to recycle the selector molecule and increase the efficiency. © 2014 American Institute of Chemical Engineers AIChE J, 61: 266–276, 2015 相似文献