用碳化铁超微粒子催化剂F－T合成反应催化性能的评价及反应条件的选择

在碳化铁超微粒子（ＵＦＰ）催化剂制备的基础上，采用内径５ｍｍ连续流动加压固定床微型反应器对该催化剂性能做了系统评价，在无原料气循环条件下的试验结果表明，在１．５ＭＰａ、３２０℃和空速（ＶＨＳＶ）约６００ｈ－１条件下，反应２０ｈ达到催化剂活性稳定期，测得２０—４８ｈ期间ＣＯ的平均转化率达９６．１％，丙烯在气相产物中的平均摩尔百分含量可达６７．３％。同时讨论了反应温度、压力、原料配比、还原温度等对催化剂活性和选择性的影响。与国内外现有的Ｆ－Ｔ合成催化剂相比，碳化铁超微粒子催化剂是一种催化活性高、选择性强、反应条件温和的新型催化剂     

微反应技术在氟化反应中的应用

有机含氟化合物因其独特的理化性质被广泛应用于精细化工领域,但传统釜式氟化仍存在在线量大、易产生热点等问题,而微反应技术作为一种高效传质传热的新型技术,有望解决以上问题。因此,该文根据底物类型,综述了近二十年微反应技术的研究进展,以及微反应技术在氟化反应中的应用。微反应技术的应用可以极大地提高氟化效率,相信微反应技术的出现将推动氟化反应向着更为高效、安全、环保、可控及连续化的方向发展,但仍需突破釜式思考模式,并对微反应技术的连续后处理过程进行进一步研究。     

微混合器内流体混合的研究进展

Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, improved safety, and access to new products and processes are directed to the microreaction technology. Microfluidic mixer is the most important component in microfluidic devices. Based on various principles, active and passive micromixers have been designed and investigated. This review is focused on the recent developments in microfluidic mixers. An overview of the flow phenomena and mixing characteristics in active and passive micromixers is presented, including the types of physical phenomena and their utilization in micromixers. Due to the simple fabrication technology and the easy implementation in a complex microfluidic system, T-micromixer is highlighted as an example to illustrate the effect of design and operating parameters on mixing efficiency and fuid flow inside microfluidic mixers.     

微反应系统控制合成硫化铋纳米材料

基于连续、可控合成开发微反应系统与工艺,设计搭建了由注射泵、聚四氟乙烯毛细管以及油浴锅组成的毛细管微反应系统。利用注射泵,通过调节注射泵流速,从而控制反应时间,在极短的时间内合成出三维Bi2S3纳米棒簇。通过改变配体及反应时间,Bi2S3由纳米颗粒向一维纳米棒过渡。利用XRD、TEM对其结构和形貌进行了表征。     

Zwitterionic Electrochemiluminescence Biointerface Contributes to Label-Free Monitoring of Exosomes Dynamics in a Fluidic Microreaction Device

The competence to construct sensing platforms capable of selective manipulation in complex biological fluids undoubtedly underpins critical future advances in healthcare. Despite the fact that electrochemiluminescence (ECL) has long been an influential technology for clinical diagnosis worldwide, ECL interface that optimizes fouling resistance has been mimicked less often, especially in an integrated platform. Herein, ECL transducer is prepared by the integration of protonated g-C₃N₄ and Ti₃C₂T_x MXene nanosheets, displaying enhanced charge injection/transfer, and inherent catalytic capacities for coreactant ECL. Mussel-bioinspired polydopamine was exploited as a thin, surface-adherent substrate to coat the solid-state transducer and further initiate secondary reactions via Michael Addition for tailing recognition element and zwitterionic segment. This architecture guarantees not only the least suppression of ECL performance but also desired antifouling properties, ensuring < 7.45% of ECL loss after 96 h of exposure to complex biological fluids. Creatively, a highly integrated platform is equipped with the established biointerface, gas diffusion electrode, and fluidic ECL microreactor, affording high-performance exosome checking and dynamics tracking in a non-label manner. Our study provides a general design strategy to obtain a robust antifouling ECL sensing interface based on zwitterionic chemistries and provides a fresh perspective in developing point-of-care and implantable ECL devices.     

Continuous,homogeneous and rapid synthesis of 4-bromo-3-methylanisole in a modular microreaction system

4-Bromo-3-methylanisole is mainly used to synthesize black fluorane dye(2-anilino-3-methyl-6-dibutylaminofluorane, ODB-2), which is one of the most important heat and pressure-sensitive dyes in the manufacture of thermal papers. Compared to the industrial heterogeneous batch process, a continuous homogeneous bromination technology in a modular microreaction system has been developed, and 4-bromo-3-methylanisole has been successfully prepared through high-selective mono-bromination of 3-methylanisole with Br_2 solution in CHCl_3. In optimal conditions, the content of bis-brominated byproducts can be controlled less than 0.5%,which is superior to the industrial standard with 99.5% 3-methylanisole conversion at very short residence time and mild reaction temperature.     

微化学工程中的微反应技术

微化学工程包括微型单元操作设备,如微型构造的传质、传热、混合、分离和反应设备等、微型传感技术,以及利用微型构造设备进行化学化工研究和生产的微化学工艺体系,其中微反应技术代表了新的化学加工途径,本文重点介绍了微反应技术的概念和一些研究应用实例。     

碲化铋纳米花的微反应合成

以Te粉和Bi_2O_3为原料,三正丁基膦（TBP）与油酸为溶剂,在微反应系统中合成了碲化铋纳米花,采用X射线衍射、透射电子显微镜、扫描电子显微镜对合成产物的物相和微观形貌进行了分析,考察了反应温度、反应前躯体溶液浓度以及反应时间对合成产物形貌的影响,研究结果表明,随着反应温度的提高,纳米颗粒生长速度加快,而前躯体溶液浓度的增加导致纳米片的团聚加剧,反应温度提高,纳米片的尺寸增大。     

连续化微反应技术在香料、香精和化妆品合成中的应用

作为一项全新的过程强化技术,连续化微反应技术在香料、香精和化妆品合成中的应用与日俱增。综述了近年来微反应技术在香料合成研发和生产方面的进展。与传统的间歇式反应器不同,连续化微通道反应器的主要特点是连续进料、传质换热能力大大加强以及可以精确控制反应参数等。该技术在许多香料合成常用的反应中都体现出了常规反应器无法比拟的优势,同时在合成香料工业应用的成功范例也展示了微反应技术可以预见的广阔前景。     

微反应器研究及展望

综合概括了微反应器(微通道反应器)的基本概念,把微反应器与其他微通道设备相区别;从化学反应工程的角度按气固相催化微反应器、液液相微反应器、气液相微反应器和气液固三相催化微反应器等类型对各种新型微反应器予以简略而突出的介绍;从其几何特性出发系统而深入地阐述了微反应器具有的一系列超越传统反应器的独特优越性;简略介绍了微反应器的制作、研究现状和展望。