共查询到19条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
生物柴油是石化柴油的重要补充.用传统的搅拌釜和管式反应器制备生物柴油,存在反应速率慢、转化率低的问题.从提高反应速率和转化率两方面综述了生物柴油新反应器的研究进展.提高反应速率的反应器包括:微波反应器、空化反应器、旋转床反应器、振荡流反应器、高剪切反应器、静态反应器、微反应器和液液膜反应器.提高转化率的反应器包括:反应/分离器、反应蒸馏反应器和膜反应器.比较了它们的优势和缺陷.提出联合使用几种技术,将强化传质与分离技术进行有效整合,使反应器小型化并缩短工艺流程,以建立适应未来的生产效率高的便携式生物柴油厂. 相似文献
5.
氯乙烯氯化法制备1,1,2-三氯乙烷工艺过程研究 总被引:2,自引:0,他引:2
研究了在鼓泡塔反应器和循环式反应器内氯乙烯氯化反应的特征,通过反应结果的对比,选择较佳的适合氯乙烯反应的反应器型式.为了确定影响氯乙烯氯化反应选择率的因素,考察了反应温度、氯气与氯乙烯配比等关键因素.确定了最佳的操作参数,为反应器选择提供了技术支持. 相似文献
6.
《化学工程》2016,(1):63-68
探讨了一种串联微反应器的设计。此串联微反应器由上下2层各自可以实现独立温控的微反应器组成。上层微反应器(微反应器1)用于预热气体、蒸发液体或使有机固体热分解形成一个气相样品。装满催化剂的催化剂反应管放置于下层微反应器(微反应器2)。气化物从上层微反应器流入下层微反应器的反应管,与其中催化剂进行反应。质量流量控制器控制1/3上层微反应器流出的反应气化物作为气相样品,进入下层微反应器催化剂床。从下层微反应器流出反应产物直接进入气相色谱仪进行分析。通过质谱检测评估催化剂的化合物组成及相对分布。通过对纤维素、甘油和麻风树"压饼"的转化,说明了此串联微反应器快速表征一种催化剂或一系列的催化剂的便捷和价值。 相似文献
7.
8.
9.
10.
为了对反应器的停留时间进行合理优化,将旋转弧等离子体反应器视为一维平推流反应器网络模型,结合裂解反应动力学模型与反应器流动模型,采用CHEMKIN-PRO对丙烷的裂解过程进行数值模拟,用于分析热等离子体反应器内丙烷的裂解过程中产物的浓度分布及温度分布情况。反应动力学模型分别采用均相反应动力学模型和非均相反应动力学模型。模拟结果表明,包含结焦模型的非均相反应动力学模型与实验结果表现出更好的一致性,随着反应器长度的增加,乙炔浓度存在最佳点。通过降低反应器的停留时间至1.0 ms以下,能有效提升C_2H_2收率。 相似文献
11.
12.
A novel fluidized‐bed membrane dual‐type methanol reactor (FBMDMR) concept is proposed in this paper. In this proposed reactor, the cold feed synthesis gas is fed to the tubes of the gas‐cooled reactor and flows in counter‐current mode with a reacting gas mixture in the shell side of the reactor, which is a novel membrane‐assisted fluidized bed. In this way, the synthesis gas is heated by heat of reaction which is produced in the reaction side. Hydrogen can penetrate from the feed synthesis gas side into the reaction side as a result of a hydrogen partial pressure difference between both sides. The outlet synthesis gas from this reactor is fed to tubes of the water‐cooled packed bed reactor and the chemical reaction is initiated by the catalyst. The partially converted gas leaving this reactor is directed into the shell of the gas‐cooled reactor and the reactions are completed in this fluidized‐bed side. This reactor configuration solves some drawbacks observed from the new conventional dual‐type methanol reactor, such as pressure drop, internal mass transfer limitations, radial gradient of concentration, and temperature in the gas‐cooled reactor. The two‐phase theory of fluidization is used to model and simulate the proposed reactor. An industrial dual‐type methanol reactor (IDMR) and a fluidized‐bed dual‐type methanol reactor (FBDMR) are used as a basis for comparison. This comparison shows enhancement in the yield of methanol production in the fluidized‐bed membrane dual‐type methanol reactor (FBMDMR). 相似文献
13.
In this study, a dynamic model for a membrane dual‐type methanol reactor was developed in the presence of long term catalyst deactivation. The proposed model is used to compare the performance of a membrane dual‐type methanol reactor with a conventional dual‐type methanol reactor. A conventional dual‐type methanol reactor is a shell and tube heat exchanger reactor in which the first reactor is cooled with cooling water and the second one is cooled with synthesis gas. In a membrane dual‐type reactor, the wall of the tubes in the gas‐cooled conventional reactor is covered with a palladium‐silver membrane, which is only permeable to hydrogen. Hydrogen can penetrate from the feed synthesis gas side into the reaction side due to the hydrogen partial pressure driving force. Hydrogen permeation through the membrane shifts the reaction towards the product side according to the thermodynamic equilibrium. The proposed dynamic model was validated against measured daily process data of a methanol plant recorded for a period of four years and a good agreement was achieved. The simulation results show that there is a favorable profile of temperature and activity of the membrane dual‐type reactor relative to single and conventional dual‐type reactor systems. Therefore, the performance of methanol reactor systems improves when a membrane is used in a conventional dual‐type methanol reactor. 相似文献
14.
15.
16.
Two types of membrane reactors have been constructed in order to evaluate the influence of membrane reactor configuration on the performance of the dehydrogenation of ethylbenzene in a porous alumina membrane reactor. The type I construction combine reaction and separation in the same space. The type II configuration is comprised of three parts, i.e., reaction prior to separation, reaction and separation, and reaction after separation. The results showed that the overall yield of styrene in Type I is only 4% higher than that of the fixed bed reactor at 893 K, while 11 % enhancement in yield to styrene was obtained with Type II through optimizing the reaction conditions. 相似文献
17.
三种反应器微观混合性能的对比 总被引:1,自引:0,他引:1
介绍了撞击流、旋转填料床和撞击流-旋转填料床三种反应器的原理;采用化学偶合法,对三种反应器的微观混合性能进行了实验测定与研究,结果表明,撞击流-旋转填料床反应器的微观混合性优于其它两种反应器。 相似文献
18.
本文以镍系催化剂催化加氢制取1,4-丁二醇为研究对象,应用工业反应过程开发方法的基本原则,进行连续加氢反应过程的开发研究,就确定优选工艺条件、加氢反应器形式的选择及反应器主要结构尺寸等进行了论述,考察了反应放大时几何尺寸的影响,并对出现的工程问题提出相应的对策。 相似文献