尿素工艺DCS控制系统增容设想

在现有DCS控制系统的基础上,进行了初步增容改造的设想,对CO2压缩机和合成系统增加了部分新的控制手段和方法。     

Measurements of Oxygen Species Available in PtRh/CeO2–Al2O3 Type Industrial Catalysts and Relationship with Their Three-Way Catalytic Activity

Measurements of the oxygen storage capacity (OSC) were performed on several aged PtRh/CeO₂–Al₂O₃ industrial catalysts, using different techniques, i.e., TPR experiments, O₂ and H₂/O₂ chemisorption. The obtained OSC values were compared to the catalytic activity measured at 723 K in the simultaneous elimination of CO, C₃ hydrocarbons and NO. The best correlation was found for the OSC measured by O₂ chemisorption at 298 K on the solids previously reduced at 573 K and which represents the most reactive oxygen atoms of the catalyst surface.     

Oxygen Storage Behavior of Ceria–Zirconia-Based Catalysts in the Presence of SO2

This paper investigates the effect of the presence of SO₂ in the dynamics of oxygen storage on ceria and ceria–zirconia. The introduction of SO₂ under reaction conditions at T<873 K negatively affects CO conversion under oscillating conditions on all the supports studied, owing to the formation of sulfate species. Deactivation is observed on all supports and activity is recovered only after desorption of SO₂, which occurs at 950<T<1000 K, depending on catalyst composition (Ce/Zr ratio) and treatment atmosphere. The amount of sulfur adsorbed is higher over solid solutions, reaching a maximum with Ce _x Zr_1–x O₂ (0.5<x<0.68). However this does not adversely affect activity compared to ceria. In the presence of Rh and Pd, reactivation is favored under reaction conditions. More generally, it appears that the removal of sulfates is facilitated in reductive atmospheres (both hydrogen and CO) over mixed oxides. No differences are observed following regeneration under oxidizing conditions.     

高吸水性树脂保水、保肥性能研究

笔者已经研制出性能较好的高吸水性树脂（SAP）,为了使其能够服务于农业生产,并获得有关高吸水性树脂的施用条件,施用量的基本数据,进行了高吸水性树脂保水、保肥性能的研究,通过一系列室内小范围田地实验,证明高吸水性树脂能保持沙性土壤中的水分,显著提高作物的出苗率,其中种子包衣实用量少而效果较好。     

兴旺时期的喜与忧（Ⅰ）——钛白行业新一轮大扩产的反思

介绍了钛白行业的总产能和扩产后行业内的主要动向 ,指出了扩产后可能产生的隐患 ,提出了反思与对策。     

108m~3聚合釜热水入料扩能改造总结

介绍了108 m3聚合釜热水入料的改造方案,改造后生产周期缩短了80～90 min,有效提高了PVC产量。     

氨冷冻系统带水原因分析及对策

分析合成氨装置氨冷冻系统带水的原因,带水对换热器、压缩机等的影响,并提出不同情况下带水的对策。     

氨增压机105J1节能技术研究及应用

通过对KBR冷冻回路深入研究,采取扩容149D液氨储罐,正常生产时停下高压电机驱动的氨增压机105J1,降低装置生产成本。     

铁尾矿干排应用倾斜板浓缩机的研制

重力浓缩是固液分离的第一道工序,为满足铁尾矿干排处理工艺中含有大量微细颗粒且浓度较低的矿浆对浓缩技术的要求,基于"浅层沉降"原理对浓缩机的结构进行改进,利用一组表面光滑的特制倾斜板面,改变固体颗粒的沉降路径,缩短沉降距离,减少沉降时间,提高沉降速度,改善液流条件,强化浓缩机工作效率,增加浓缩机自然沉淀面积及单位面积生产能力,提出一种新型高效倾斜板浓缩机。     

Effect of Sonication in the Preparation of Activated Carbon Particles on Adsorption Performance

The impact of acid and base adsorption capacities of activated carbon (AC) particles with activation condition, contact time, specific surface area (SSA), particle size, concentration, and temperature was studied. AC was pre-treated by sonication to improve the surface characteristics and enhance its adsorption capacity. Sonication increased the SSA of AC. SEM imaging showed good dispersion and uniform AC particles with an average diameter of about 0.6 μm. The adsorption results demonstrated that AC surfaces possessed effective interactions with acids and bases, and the greatest adsorption capacity was achieved with CH₃COOH, where data were analyzed by Freundlich and Langmuir isotherms. It was found that the isotherm data correlated well with the Freundlich isotherm. Adsorption of raw AC particles increased under sonication conditions. The adsorption process with sonicated and unsonicated AC particles obeyed pseudo first-order kinetics.