共查询到19条相似文献,搜索用时 140 毫秒
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膜化学反应器及其应用进展 总被引:2,自引:1,他引:2
提出将膜化学反应器分为四 :膜反应分离器、膜混合反应器、膜混合反应分离器和膜介观孔道反应器,并分别对各类反应器的特征、功能及其应用进行了评述。 相似文献
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用自制的多孔金属-SiO2复合膜组装成一种新颖的膜反应器,利用CO变换反应考察该膜反应器的性能实验系统地考察了反应温度,空速、水/气比和只发气流量对CO转化率的影响。结果表明,在相同的反应条件下,膜反应器的转化率比固定床反应器的转化率提高4-11%左右,最高可达20%。 相似文献
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采用带有渗透蒸发膜分离过程的膜反应器对树脂催化的双酚-A合成反应作了研究,通过与空白动力学实验数据进行比较,证明了用聚酰亚胺渗透蒸发膜对抑制反应的产物水进行连续脱除可以有效地加快反应速度,从而提高了双酚-A的单程收率,这为渗透蒸发的应用提示了一个新的领域。 相似文献
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酶膜反应器及其工业应用研究 总被引:3,自引:0,他引:3
综述了在工业上具有重要应用的生物催化反应设备-酶膜反应器的概念及其发展、分类和操作特性。特别介绍了两种典型的酶膜反应器——搅拌式酶膜反应器与活塞流式酶膜反应器的结构设计和在工业应用中的生产工艺流程,有重点地介绍了酶膜反应器在工业生产中的几种应用研究,指出酶膜反应器是工业生产的新型反应器,并对酶膜反应器的发展方向阐述了相关建议。 相似文献
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设计了用于游离细胞生物转化的反冲式膜反应器,反应器内增加搅拌装置以减轻细胞对膜的堵塞。实验体系采用含天冬氨酸酶的大肠杆菌细胞转化反丁烯二酸为L-天冬氨酸。研究了膜孔径大小和细胞浓度对反应器的影响。并与利用固定细胞的填充床反应器进行了比较 相似文献
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阐述膜生物反应器的分类、原理,总结了MBR在水处理领域中的应用现状,讨论了膜生物反应器对污染物的去除机理,并就膜的污染及其解决办法进行评述。 相似文献
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M. FarsiA. Jahanmiri 《Chemical Engineering Research and Design》2011,89(12):2728-2735
Coupling reaction and separation in a membrane reactor improves the reactor efficiency and reduces purification cost in the next stages. In this work a novel reactor consisting two membrane layers has been proposed for simultaneous hydrogen permeation to reaction zone and water vapor removal from reaction zone in the methanol synthesis reactor. In this configuration conventional methanol reactor is supported by a Pd/Ag membrane layer for hydrogen permeation and alumina-silica composite membrane layer for water vapor removal from reaction zone. In this reactor syngas is fed to the reaction zone that is surrounded with hydrogen-permselective membrane tube. The water vapor-permselective membrane tube is placed in the reaction zone. A steady state heterogeneous one-dimensional mathematical model is developed for simulation of the proposed reactor. To verify the accuracy of the model, simulation results of the conventional reactor is compared with the available plant data. The membrane fixed bed reactor benefits are higher methanol production rate, higher quality of outlet product and consequently lower cost in product purification stage. This configuration has enhanced the methanol yield by 10.02% compared with industrial reactor. Experimental proof-of-concept is needed to establish the safe operation of the proposed configuration. 相似文献
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采用反应-分离集成的膜反应器进行分布式制氢,对简化工艺、降低能耗、提升技术经济性至关重要。本文采用数学模型对甲烷蒸汽重整制氢过程膜反应器进行模拟,系统分析了渗透侧操作策略、反应压力、反应温度、钯基膜性能、催化剂性能对反应器行为的影响;并以1m3/h甲烷最大程度转化为目标进行分布式制氢案例分析,详细比较膜反应器技术与“常规反应器+膜分离”工艺技术。结果表明,膜反应器在反应压力30atm(1atm=101325Pa)、反应温度500℃下操作可实现紧凑设计,比“常规反应器+膜分离”工艺技术具有明显优势,但是亟需研发更佳活性(10倍)的钯基膜和催化剂以实现显著的过程强化。模拟结果可为不同规模分布式制氢膜反应器的操作与设计及进一步的性能强化提供指导。 相似文献
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一体式光催化氧化-膜分离三相流化床反应器 总被引:3,自引:1,他引:2
耦合光催化氧化和有机膜分离技术,设计了一种新型一体式光催化氧化-膜分离三相流化床反应器;并通过利用颗粒状TiO2对酸性红B废水的降解实验,研究了反应器的基本性能。结果表明:一体式反应器中的膜组件可有效地分离TiO2,使其在反应器中循环使用。反应区曝气量是TiO2发生沉积的主要影响因素,且反应区曝气量以3.6m3/h为宜,而脱色率随TiO2质量浓度的增加呈现为先增加其后保持不变的变化趋势,最佳TiO2质量浓度为2g/L。膜组件底部的曝气装置可大大减轻膜污染,但并不对TiO2的沉积产生影响。一体式反应器可实现长期、稳定地运行。 相似文献
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Q Gan SJ Allen G Taylor 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(6):688-698
Enzymatic cellulose hydrolysis has been studied for many years, generating rich literatures and knowledge in respect to the underlying reaction mechanism, reaction kinetics, and bioreactor systems. This paper attempts to offer some additional information and new understanding of how reaction kinetics and reactor productivity can be improved in a process involving simultaneous reaction and product separation using a purpose‐built membrane reactor with a single combined reaction zone and separation zone. Different operating strategies of batch, fed batch and continuous cellulose hydrolysis were investigated with intermittent or simultaneous removal of products (reducing sugars) to reduce enzyme inhibition and improve reactor productivity. The effect of continuous and selective product removal, reduced enzyme inhibition and higher enzyme concentration in retention were examined for the potential benefit in process integration and intensification in order to lower the high process cost of the enzymatic hydrolysis process, mainly due to slow reaction kinetics and expensive enzymes. A mathematical model was offered to account for the effect of selective product (reducing sugars) separation, permeate flux, reduced cellulase inhibition, dynamic structural change of the solid substrate and possible shear deactivation of the enzyme. Computer analysis was also carried out to analyse the quasi‐steady state of the reaction intermediates in order to gain an insight into the reaction mechanism in simultaneous reaction and separation systems. Some original analysis and simulation of the effect of membrane separation parameters on the overall reactor performance is offered, including the effect of membrane selectivity (rejection coefficient) and flux. Copyright © 2005 Society of Chemical Industry 相似文献