Rückgewinnung von Vinylchloridmonomer

The production of the polymer polyvinylchloride (PVC) emits a high amount of waste gas. The recovery of the evaporated base product vinylchoridemonomer (VC) is an important aspect for the economics of the whole process. Membrane and vacuum technology improve the efficiency and the economics of the recovery process considerably.     

激光光束质量因子的研究进展

本文详细分析了各种光场下光束质量M2因子。在不同的场中,A.E.Siegman当初所定义的M2因子,已经有了很大的变化,因而M2因子的特性也与当初不同,不仅M2因子可以大于等于1,而且可以小于1,甚至小于0。其反映的物理意义,也从经典场中的衍射极限倍数,变化为非经典场中的准直性量度以及对空间相干性的某些反映。此外还列举并分析了几种特殊的光束质量因子,最后讨论了M2因子应用的问题并指出了其局限性。     

基于VC＋＋的仿真训练系统编程

给出了以PCI-I64IOT型I/O卡为核心的硬件接口电路和软件设计思想,详细分析了编程方法。实践表明,利用该系统能完全实现侦察专业的全部训练科目,满足部队和院校训练的需要。     

稻壳基碳量子点对废水中Pb(Ⅱ)的检测

为了进一步实现生物质废弃资源的综合利用,以及对废水中污染物的检测,以稻壳粉为原料,在600℃和N2氛围下煅烧完成后使用一步水热法制备了钝化剂修饰的碳量子点,得到荧光为蓝绿光的二酸铵(ACA-CQDs)改性稻壳基碳量子点.采用SEM/EDS、HRTEM、FTIR等现代分析技术对碳量子点进行了理化特性表征,发现二酸铵(ACA-CQDs)量子点可以成功检测水中的Pb(Ⅱ).建立了一种有效的检测水体中Pb(Ⅱ)简便快速高效的方法.     

多元复杂精馏过程模拟和优化

采用非平衡级METSH方程组，对丙烯精馏过程进行了模拟计算和优化，提出了一种全新的、实用的塔板组成的圆整归一方法，摸索出了一套行之有效的计算程式，大大提高了模型方程组迭代计算的收敛性，求解更加稳定。本文还以精馏塔利润为目标，建立了优化目标函数，进行了优化计算，计算结果对丙烯塔生产具有一定意义。     

钛合金叶片隔热烘漆的研制

以双酚A型环氧树脂为主要成膜物质,以氮化硼为功能填料,以丁醇醚化脲醛树脂为固化剂,并添加己二酸聚酯弹性体树脂改善其柔韧性、提高涂膜的机械性能,最终得到附着力强、耐热性好、隔热作用明显的飞机发动机叶片用防护涂料.     

Kinetics of the methanation of carbon dioxide over a supported Ni-La2O3 catalyst

The kinetics of the methanation of carbon dioxide was investigated using an alumina supported Ni-La₂O₂ catalyst in a differential and integral reactor. In the differential reactor the molar ratio of H₂ to CO₂ was varied from 0.6 to 30. In the integral reactor the rates were measured with up to 90% conversion. Both reactor tests were carried out at temperatures between 513 and 593 K. The experimental results were described by a Langmuir-Hinshelwood type equation. The kinetics can be explained by assuming equilibrium of dissociative carbon dioxide and hydrogen adsorption, and assuming hydrogenation of surface carbon as the rate determining step.     

VOID FRACTION PROFILES IN PLANE-POISEUILLE FLOW OF VISCOELASTIC FOAMS

This investigation focuses on slow, isothermal, two-phase flow of gas bubble suspensions in Separan solutions, prepared with the help of a sodium borohydride blowing agent at room temperature. The total residence time in these experiments is much smaller than characteristic times for growth or rise of bubbles. The variation of bubble volume fraction across a narrow gap between two planes, is recorded at two locations along the flow direction. This is done with a Cesium gamma-radiation source focused on a region of area.012 cm² in the flow plane, and a Sodium iodide detector across the channel yielding a resolution of.01 over the range of void fractions investigated from.02 to.08. This measurement allows us to identify conditions under which the two-phase flow may be described by a two fluid model with a uniform bubbly core and a bubble free wall layer. With this two phase flow structure, a relative viscosity equation for the suspension is used to compute an apparent viscosity. Such calculations indicate that the observed reduction in apparent viscosity for the two phase flow may be attributed to a bubbly core which is more shear thinning than the medium. The additional shear thinning factor for the suspension is related to the elasticity of the medium.     

马来酸酐接枝聚丙烯增容聚丙烯/碳酸钙复合物力学性能与增容机理

用在50L固相接枝反应器中合成的马来酸酐接枝聚丙烯(PP-g-MAH)作界面改性剂，制备了马来酸酐接枝聚丙烯／聚丙烯／碳酸钙(i-PP／PP-g-MAH／CaCO3)复合材料。研究了i-PP／PP-g-MAH／CaCO3复合材料的力学性能和增容机理。结果表明，PP-g-MAH对i-PP／CaCO3复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高；PP-g-MAH与CaCO3反应形成PP-g-MAH的钙盐，实现反应性增容。