共查询到17条相似文献,搜索用时 203 毫秒
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Y沸石催化剂催化蒸馏干气与苯制乙苯 总被引:3,自引:0,他引:3
采用耐水、耐硫的改性Y沸石催化剂,对催化蒸馏干气与苯制乙苯工艺进行了研究,得到了较佳的催化蒸馏反应工艺条件。乙烯重量空速、反应温度和压力、回流比是影响乙烯转化率的主要因素,而乙苯选择性随反应条件的变化较小,一般在90%~95%。反应段温度分布均匀,乙苯等反应产物的含量很低,一般不超过2%(mol)。 相似文献
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针对催化裂化干气制乙苯技术的发展和干气中丙烯对催化剂及成套技术的影响进行了对干气中丙烯选择吸收以降低其中丙烯含量的研究.通过苯、乙苯、柴油、反烃化料和乙苯/反烃化料等吸收剂对干气中丙烯吸收效果对比,表明,采用m(乙苯)/m(反烃化料)混合料对干气中丙烯吸收效果最理想.采用低温和高吸收剂/干气体积比有利于乙苯/反烃化料的混合物吸收剂对干气中丙烯的吸收,且吸收剂吸收后的气体在一定的条件下可解吸,解吸后的吸收剂可循环使用,利用吸收后的催化裂化干气制乙苯可明显降低苯耗和提高乙基化产物选择性. 相似文献
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Jie He Baoyun Xu Weijiang Zhang Cuifang Zhou Xuejia Chen 《Chemical Engineering and Processing: Process Intensification》2010
The production of n-butyl acetate by transesterification of methyl acetate with n-butanol, catalyzed by acidic ion-exchange resin NKC-9, was experimentally investigated in a homemade catalytic distillation column with a diameter of 80 mm. A non-equilibrium stage model for describing the catalytic distillation process was established and solved with Newton-Homotopy method. The effect of feeding mode, reflux ratio, material molar ratio and number of reactive sections on the conversion of methyl acetate was investigated. The experimental results agree well with those obtained by the theoretical simulation calculations, indicating the accuracy and reliability of the non-equilibrium model. It can be concluded that the non-equilibrium model established in this paper can provide theoretical guidance for the further process design and optimization. 相似文献
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Yuxiang Zheng Flora T.T. Ng Garry L. Rempel 《Chemical engineering journal (Lausanne, Switzerland : 1996)》2004,100(1-3):119-127
A comparison of computer simulation results of catalytic distillation (CD) obtained from a three-phase non-equilibrium model and a pseudo-homogeneous non-equilibrium model was performed. Simulations were carried out on the CD processes for the production of ethyl cellosolve (EC) and diacetone alcohol (DAA) using both the pseudo-homogeneous non-equilibrium model and the three-phase non-equilibrium model. Similar results for the synthesis of EC were obtained using these two models. However, only the three-phase non-equilibrium model could adequately describe the CD process for the aldol condensation of acetone (Ac) at low reflux flow rates. Hence our results suggest that for a reaction system that is kinetically controlled, a pseudo-homogeneous non-equilibrium may adequately simulate the temperature profile, yield and selectivity for a CD process. However, for a CD process that is sensitive to solid–liquid mass transfer, the three-phase non-equilibrium model is required. 相似文献
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Delayed coking is an important process in refinery to convert heavy residue oils from crude distillation units (CDUs) and fluid catalytic cracking units (FCCUs) into dry gas, liquefied petroleum gas (LPG), gasoline, diesel, gas oils and cokes. The main fractionator, separating superheating reaction vapors from the coke drums into lighter oil products, involves a de-superheating section and a rectifying section, and couldn't be simulated as a whole column directly because of non-equilibrium in the de-superheating section. It is very important to correctly simulate the main fractionator for operational parameter and energy-use optimization of delayed cokers. This paper discusses the principle of de-superheating processes, and then proposes a new simulation strategy. Some key issues such as composition prediction of the reaction vapors, selection of thermodynamic methods, estimation of tray efficiency, etc. are discussed. The proposed simulation approach is applied to two industrial delayed cokers with typical technological processes in a Chinese refinery by using PRO/II. The simulation results obtained are well consistent with the actual operation data, which indicates that the presented approach is suitable to simulate the main fractionators of delayed cokers or other distillation columns consisting of de-superheating sections and rectifying sections. 相似文献
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催化蒸馏合成乙二醇乙醚的过程模拟 总被引:17,自引:1,他引:17
修正了非平衡级速率模型,使之能适用于催化蒸馏过程的模拟.此催化蒸馏塔的精馏段和提馏段为一般的填料塔结构,而反应段为CR&L公司提出的特定结构的催化剂填充层.采用专门测定此特殊结构的催化剂填充层的气膜和液膜传质系数关联式来计算反应段中的传质速率,用Onda的关联式计算精馏段和提馏段填充层中的传质速率.结合在NKC-01分子筛催化剂上环氧乙烷与乙醇反应的动力学方程式,采用Newton-Raphson技术完成了催化蒸馏合成乙二醇乙醚过程的模拟,结果是令人满意的. 相似文献
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低浓度丙烯和苯催化精馏合成异丙苯过程非平衡级模拟 总被引:4,自引:0,他引:4
对苯与低浓度丙烯合成异丙苯的催化精馏过程建立非平衡级模型。针对模拟过程难以收敛的特点,在计算的开始阶段引入了模式搜索法(Hook-Jeeves method)求解。通过对变量的取值范围进行一定的约束,可比牛顿型法适用较宽的初值范围。计算中根据所用催化精馏塔的特点,对方程进行了一定程度的简化。得到了催化精馏塔内的温度及液相组成分布。模拟结果与试验数据吻合较好,可以为工艺设计提供参考。 相似文献
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为了分离丙酮-四氢呋喃共沸混合物,研究了萃取精馏在丙酮-四氢呋喃物系中的应用。通过溶剂选择原理初选出乙苯作为萃取精馏分离此共沸物系的溶剂,同时采用NRTL模型对常压下丙酮-四氢呋喃物系和加入溶剂乙苯后的汽液平衡进行模拟和实验验证,模拟结果与实验数据吻合较好。然后进行了间歇萃取精馏分离此共沸物的实验研究来进一步考察所选萃取剂的效果。结果表明:乙苯能够消除丙酮-四氢呋喃共沸物系的共沸点,采用有40块理论板的填料塔,回流比为5,溶剂摩尔比为2.5∶1时塔顶可以得到质量分数为99.34%的丙酮产品,说明采用乙苯作萃取剂分离丙酮-四氢呋喃共沸物是可行的。最后又对连续和间歇萃取精馏分离丙酮-四氢呋喃共沸物的流程进行了模拟,得到的工艺参数将为进一步的工业应用提供了理论依据。 相似文献