化学交联聚乙烯微孔材料的研制

利用化学交联的手段增加聚乙烯的熔体强度,选择合适的聚乙烯牌号、交联剂的品种和用量、发泡剂的品种和用量及成核剂等,研究了各种工艺条件,制备出性能优良的聚乙烯微孔材料,并阐述该材料在汽车、家电及农业上的应用。     

Research on thermal risk and decomposition behavior of methyl nitrite

The thermal hazards of methyl nitrite(MN) were investigated in the present study. The determination and evaluation of MN decomposition were conducted using a C600 micro thermometer. The thermal runaway reaction characteristics of the compound under different initial pressures were obtained using a VSP2 calorimeter. The kinetic parameters of MN were obtained by regression fitting and calculation of the microthermal experimental data. The experimental and calculated results demonstrated that the potential explosion risk of MN is very high.In addition, there was a high energy barrier in the early stage of the uncontrolled decomposition of MN; however,once the decomposition reaction was initiated, the subsequent decomposition was easily conducted. Under the conditions of adiabatic simulation, the possibility that the reaction was uncontrolled increases with the initial temperature and pressure of the system, and there is a great potential safety risk.     

压铸用可溶性盐芯的工艺研究

本文对压力铸造中适用的可溶性盐芯的工艺进行了较全面的研究,在实验的基础上,对其最佳配方、形成工艺、烧结工艺、性能检测以及在压铸中的应用和盐芯的溶解等方面,做了大量工作,取得具有实践意义的资料。实验证明:运用可溶性盐芯可以有效地简化模具没计、降低生产成本,有一定的使用价值。     

Model-based Scale Up of Solid Bowl Centrifuges Using Experimentally Determined Material Functions

The scale up of solid bowl centrifuges is a major challenge as the process and material behavior are complex and difficult to describe. A common approach to forecast the process behavior is to use analytical models and transfer the experience gained from the lab to the industrial scale. In this context, time-consuming and cost-intensive pilot scale experiments are necessary. This paper presents a methodology to improve the scale up process and make it more sustainable by using a numerical model that allows the real-time tracking of the process and a more reliable scale up process. For this approach, the material behavior is derived from laboratory experiments whereby the scalability is given. Here, the determination of material functions allows an accurate representation of the material behavior for solid bowl centrifuges of different scales. The focus of this paper is the detailed explanation of material related functions for the scale up of decanter centrifuges.     

香紫苏内酯合成新工艺的研究

综述了国内外香紫苏内酯的合成工艺 ,开发出了通过添加相转移催化剂 ,在常温下用高锰酸钾氧化香紫苏醇合成香紫苏内酯的生产新工艺 ,香紫苏内酯的得率达到 5 9%,含量大于 95 %。     

Effect of FA chain length on normal- and reversed-phase HPLC of phospholipids

Forty-seven saturated synthetic diacyl PA, PC, PE, PG, and PS and five unsaturated diacyl phospholipids (PL) underwent normal- and reversed-phase (RP) HPLC with isocratic isopropanol/hexane/water (5∶4∶1) and methanol/chloroform/acetonitrile/water (79.5∶9∶8∶3.5) mobile phases, respectively. For normal-phase HPLC, capacity factors (k′ _i ) decrease with chain length (n) of the two identical PL FA residues, whereas the opposite occurs with RP (C₁₈)-HPLC. Plots of In k′ _i vs. n for individual PL classes are in general curved, violating the linear free-energy relationship. For PL of the same n but with different head groups, k′ _i with normal-phase HPLC varies as PE<PG<PA<PS<PC, except when n≥16, when the order is PE<PS≈PA≈PG<PC. For RP-HPLC, the order of k′ _i values is PG<_A≈PS≤PC≈PE until n≥16, when it is PA≈PG<PS≪PC≈PE. With normal-phase HPLC, k′ _i values of PL with unsaturated FA of n=18 are ordered as PE<PA<PC. Increasing degrees of unsaturation lead to increasing k′ _i .     

HPVC/BR共混体系的性能研究

采用动态硫化方法制备高聚合度聚氯乙烯／顺丁橡胶(HPVC／BR)共混型热塑性弹性体，考察了单一组分增容剂丁腈橡胶(NBR)、氯化聚乙烯(PE—C)和(氢化苯乙烯／丁二烯／苯乙烯)嵌段共聚物(SEBS)，复合增容剂SEBS／NBR和PE—C／NBR及交联程度对HPVC／BR共温体系相容性的影响。结果表明，使用复合增容剂可明显改善HPVC／BR共混物的性能；动态硫化在改善共混物力学性能方面起主要作用。     

定向井技术在白庙气田产能建设中的应用

东濮凹陷白庙气田构造破碎、储层相变快、储量分布不均匀。如何以较少的钻井投资，尽量多地钻遇气层层数，以较少的钻井数最大限度地控制气田地质储量，是高效开发白质气田的难点。通过气田地质研究及气藏工程论证，提出定向井设计思路，并根据不同的地质条件，研究设计出不同类型的定向井，应用于白庙气田产能建设中，效果显著。     

Preparation and Catalytic Performance of Mesostructured Aluminosilicate Nano-particles with Wormhole-Like Framework Structure

A facile two-step sol–gel method has been developed for the preparation of mesostructured aluminosilicate nano-particles (Si/Al = 7.5) with wormhole-like but uniform pore structures and highly catalytic activities towards bulky hydrocarbon cracking. It is desirable that, as this synthesis takes place in the absence of alkali cations, the mesoporous nano-particulate material is directly obtained in the acid form, making a subsequent ion-exchange and calcination treatment superfluous.     

氧化-混凝工艺处理碱性含砷废水的试验研究

研究了用氧化与混凝组合工艺处理某锑冶炼厂排放的碱性含砷废水。研究结果表明,聚合硫酸铁较三氯化铁、硫酸亚铁对原水中砷的去除效果好;用氧化与混凝组合工艺较单纯用混凝工艺对砷的去除率高：双氧水、次氯酸钠这两种氧化剂中采用次氯酸钠氧化对原水中砷的去除效果及处理成本最佳。