负载型纳米零价铁及含铁双金属颗粒降解氯代有机物的研究进展

零价铁及含铁双金属颗粒因对氯代有机物降解效率高,而受到国内外的广泛关注.目前该领域的研究热点是纳米铁的改性研究.主要对零价铁及含铁双金属颗粒的负载改性、降解氯代有机物过程中主要的影响因素作了介绍.对颗粒负载改性技术存在的问题作了简要的探讨,并且展望了该技术的应用前景和发展趋势.     

A study on the compatibility and physical properties of chlorinated polyethylene rubber/nitrile rubber blends

The miscibility and some physicomechanical characteristics of chlorinated polyethylene rubber (CPE) and nitrile rubber (NBR) blends have been investigated. Calculation of the heat of mixing, differential scanning calorimetry, and scanning electron microscopy analysis showed that CPE was miscible with NBR in all proportions. The cure and scorch times decreased with the increase in NBR content, whereas the maximum torque increased. The tensile strength, 100% modulus, elongation at break, tear strength, and compression set decreased with increasing of NBR content. After aging, hardness and tensile strength increased, and there was no drastic change in elongation at break on aging. The thermal aging resistance and the abrasion resistance of NBR are improved after blending with CPE, but the oil resistance decreased. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

镁硅铁遇水放出易燃气体反应动力学研究

为评价镁硅铁合金在储运过程中的危险特性,采用遇水反应放出气体测定仪研究了镁硅铁遇水放出易燃气体的反应动力学.分别测定了镁硅铁合金在粒径为60目、100目、120目、240目和温度为20℃、30℃、35℃、40℃条件下的放出气体速率,总结了其遇水放出气体的反应规律,进而获得了粒度参数、速率常数、反应活化能和指前因子等重要...     

Epoxidation of Propylene with Dilute H2O2 over Titanium Silicalite Containing Trace Aluminum

Titanium silicalite (TS-1) was successfully synthesized by using TPABr as the template and silica sol as silicon source in a 100 l stainless steel autoclave. IR, XRD, UV--vis, elemental analysis, and ²⁷Al and ³¹P MAS NMR were used to characterize the synthesized products. The results show that the synthesized material has an MFI structure with high crystallinity and large crystal size and two kinds of titanium species. Trace aluminum in silica sol is also incorporated into the zeolite framework. The synthesized TS-1 exhibits high activity in the epoxidation of propylene with dilute H₂O₂ with high selectivity to methyl mono-ethers and low selectivity to propylene oxide (PO). The low selectivity toward PO is due to the residual acidity onto TS-1. The selectivity of PO can reach up to 90% through adjusting the pH of the reaction mixture. Extra amounts of base decrease the H₂O₂ utilization and the H₂O₂ conversion. However, in over acid-treated TS-1 in which part removal of extra-framework titanium takes place, the utilization of H₂O₂ is quite different: for the low Si/Ti ratio of TS-1, the H₂O₂ utilization increases. But the utilization of H₂O₂ does not change for the high Si/Ti ratio TS-1. Thermal analysis shows that the as-synthesized TS-1 exhibits high activity and thermal stability in the calcined range 540-900 °C.     

丙烯酸酯-苯乙烯共聚物高吸油树脂的合成与性能

以甲基丙烯酸酯和苯乙烯为单体，丙烯酸乙二醇酯为交联剂，采用悬浮聚合法合成了高吸油树脂；研究了共聚单体组成，交联剂用量对吸油树脂吸油性能及吸油后树脂强度的影响。结果表明。所制成的树脂可吸自重21倍以上的煤油．25倍以上的苯、二甲苯，且吸油后树脂强度高。     

Concentration and separation of glycyrrhizic acid by foam separation

By the aid of the surface activities of glycyrrhizic acid, foam separation can be used to extract and concentrate it. The effects of operating parameters such as flow rate of air, initial feed concentration, pH and ionic strength on the enrichment ratio and recovery yield of glycyrrhizic acid are investigated in detail. In addition, the influences of other surface‐active substances in solution, such as proteins, on the separation of glycyrrhizic acid are also discussed. The experimental results show that foam separation is a simple and effective method to separate and concentrate glycyrrhizic acid. © 2002 Society of Chemical Industry     

Aspen Plus在加氢裂化尾油低温热利用技术改造中的应用

目前炼油企业低温热回收利用是降低能耗的一种重要手段[1]。扬子石化加氢裂化装置为了挖掘节能空间尽量回收低温热,利用Aspen Plus对尾油换热流程进行模拟分析,在此基础上提出了920单元DA912塔再沸器热源技术改造方案,达到了节能降耗的目的。每年可节约生产成本约423万元,经济效益显著。     

Synthesis and characterization of fluorescent PEG-polyurethane with free carboxyl groups

An innovative spherical poly(vinyl alcohol)(PVA)/peat/clay porous composite bead was prepared and shown to be suitable for use as an adsorbent. The mass transport process for the adsorption of metal ions onto this composite bead in an aqueous system was investigated. In the external mass transport process, the diffusion coefficient (D₁) of Cu⁺² and Zn⁺² ions increased with increasing initial metal ion concentration and the increasing effect was more pronounced in the initial metal ion concentrations range of 18?×?10^-3 to 22?×?10^-3?M. The diffusion rate of Zn⁺² ions was faster than that of Cu⁺² ions. In the intraparticle diffusion process, the diffusion coefficient (D₂) decreased with increasing initial metal ion concentration in the initial concentration range of 1?×?10^-3 to 4?×?10^-3?M, and the value of D₂ maintained an almost constant value in the initial concentration range of 8?×?10^-3 to 22?×?10^-3?M. The rate of ion diffusion within the adsorbent for Cu⁺² ions was faster than that for Zn⁺² ions. The adsorption mechanism was controlled by the intraparticle diffusion process. The adsorption followed the Langmuir adsorption isotherm model. The maximum amount of adsorbed metal ions for Cu⁺² and Zn⁺² ions were 22.57 and 13.62?mg/g composite bead, respectively.     

软测量预估延迟焦化粗汽油干点及收率

通过采集过程参数建立粗汽油干点软测量模型的汽油收率,柴油收率,蜡油收率,气体收率,焦碳化率的预估模型,并在线投用,校正。     

聚乙烯的硅烷交联技术及应用

讨论了聚乙烯交联的各种技术,介绍了硅烷法聚乙烯交联技术的原理原料工艺及应用。详细讨论了内部水引发硅烷水解交联的几种方法,解决了厚壁制品交联困难的问题