High efficiency and reusability of iridium complexes adsorbed in montmorillonite clay on catalytic hydrogenation of imines

Heterogenised homogeneous catalytic hydrogenation of aldimines by removable and reusable immobilised iridium complexes on montmorillonite clay. This revised version was published online in July 2006 with corrections to the Cover Date.     

溢流碎流型气液分配器的开发研究

国内在役和设计的加氢反应器内构件多数使用抽吸型气液分配器的分配技术。洛阳石油化工工程公司对抽吸型和溢流型气液分配器的特点进行了技术分析，开发出一种具有碎流板结构的溢流碎流型气液分配器。在主体为直径600mm的有机玻璃塔实验装置上，采用空气和水介质，将溢流碎流型气液分配器与典型的抽吸型气液分配器进行对比实验，结果表明，溢流碎流型气液分配器的压力降比抽吸型的低，对液相的分配均匀性比抽吸型的好，操作弹性比抽吸型的大。     

装硬质合金圆刀片的左右阶梯端铣刀设计

介绍了装有硬质合金圆刀片的左右阶梯端铣刀的基本结构，对其几何参数和结构参数作了进一步分析。通过试验研究，阐明了该铣刀的优点和用途。     

Use of thiourea to inhibit the incorporation of hydrogen in Ti and Ti-6Al-4V alloy

Commercially pure titanium and a Ti-6Al-4V alloy covered with a thin thermal oxide film derived from hot rolling were electrolytically hydrogenated in 1N aqueous sulfuric acid solution (H₂SO_4(aq)) to see the influence of thiourea (H₂N-CS-NH₂) on the hydrogen uptake of both metals under atmospheric conditions. The inhibitive effect of thiourea was evaluated through quantitative composition analyses (by using a glow discharge spectrometer, GDS) and qualitative microstructural examinations (by using XRD). Thiourea acts as a hydrogenation inhibitor irrespective of the applied current densities. However, the inhibitive effect is more evident at lower charging current densities for longer operating periods.     

Selective hydrogenation of styrene. II. Poisoning of Pd/Al2O3 by thiophene and pyridine

The poisoning of a commercial Pd/Al₂O₃ catalyst by pyridine and thiophene during the selective hydrogenation of styrene to ethylbenzene was studied. It was found that the Pd electronic state is the main factor controlling the interaction between the metal and the poisons. Pyridine added to the non-poisoned feed in a pulse produces a modification in the Pd electronic state and a decrease in conversion, but, within certain limits, inhibits the adsorption of more pyridine or thiophene molecules.     

硝基苯催化氢化生产对氨基苯酚

采用一种新式的萃取装置处理硝基苯催化氢化的反应液,得到提纯的对氨基苯酚溶液,进而获得优质的对氨基苯酚工业产品。经检测,对氨基苯酚产品达到制药用各项标准。该工艺简单,原料易得,产品质量好,产率高,三废少。对氨基苯酚生产、副产品回收和三废处理的工艺完善合理,是国内对氨基苯酚生产的一条新路线。     

Catalytic hydrogenation for improvement of GaAs/Ge solar cell efficiency

Hydrogen passivation on MOCVD grown p-GaAs epilayers on Ge substrate have been studied by plasma and catalytic hydrogenation and the results were compared. The conversion efficiency of the GaAs/Ge solar cells was found to increase by 10% after catalytic hydrogenation at AM1.5. This increase in efficiency is probably due to passivation of surface dangling bonds.     

光学经纬仪一测回水平方向标准偏差测量不确定度评定

分析了检定光学经纬仪“一测回水平方向标准偏差”的误差来源，并确定了它的合成标准不确定度和扩展不确定度。     

加氢换热器角焊缝密封接头焊接工艺参数优化

利用有限元软件ABAQUS,开发了一个顺次耦合的角焊缝焊接热应力计算程序,研究了加氢高压换热器板式焊接密封接头应力场的分布;以此数值模拟结果为基础,结合正交试验设计方法,分析了焊接电流、电弧电压、焊接速度及预热温度4个工艺参数对焊接残余应力场的影响,找到一组使焊接残余应力最小的最优焊接工艺参数.结果表明,焊接速度对焊接残余应力的影响最大,该角焊缝焊接残余应力的最高值集中在焊缝和热影响区附近.研究结果为优化加氢高压换热器板式焊接密封的焊接工艺,预防焊接密封接头的开裂失效提供了理论基础.

Abstract：

Using the finite element analysis software ABAQUS, a sequentially coupled fillet welding thermal-stress program was developed to calculate the stress distribution of plate sealing joint in the high pressure hydrogenation heat exchange. Based on the numerical solutions and the orthogonal method, the influence of four welding parameters including welding current, welding voltage, welding speed and preheating temperature on residual stress distribution was analyzed and a group of optimal welding parameters were obtained, which provided a reference for preventing the failure of fillet weld sealing joint in the high pressure hydrogenation heat exchange.     

正交设计法催化氢化制备2，5-二氨基-4，6-二羟基嘧啶

以Pd/C为催化剂直接催化氢化2-氨基-4,6-二羟基-5-亚硝基嘧啶削备2,5-二氨基-4,6-羟基嘧啶,采用正交设计方法考察了碱的浓度、溶剂、催化剂用量、温度、反应时间等对反应的影响,收率在86%以上。