Hysys软件在分析精丙烯硫化物来源中的应用

气体分馏装置原料液化石油气 (LPG)中有机硫化物形态复杂 ,考察分析工业装置精丙烯硫化物含量变化难度大。利用Hysys模拟 ,分析判断LPG中小分子有机硫化物在气体分馏产品的分布并提出了控制措施。考虑操作条件对精丙烯硫含量的影响 ,并对工业装置精丙烯总硫超标原因进行了分析。     

Calorimetric determination of the enthalpy change for the binding of methyl orange to poly(vinylpyrrolidone) in aqueous solution

Thermodynamic parameters have been determined for the interaction of methyl orange and poly(vinylpyrrolidone) in aqueous solutions containing tris, tris and hydrochloric acid, or water only. Enthalpy changes were determined by use of a flow microcalorimeter. Free energy changes were calculated from the results of equilbrium dialysis studies. The results are interpreted in terms of the behaviour of poly(vinylpyrrolidone) in these systems. Analysis of data shows that the hydrophobic interactions in the systems are in the order: tris > wateronly > tris-HC1.     

Linear viscoelastic properties of mixtures of 3- and 4-arm polybutadiene stars

The viscoelastic properties of a three-arm and a four-arm star polybutadiene with the same arm molecular weight (M_a) were studied. The zero-shear recoverable compliance (J⁰_e) and plateau modulus (G⁰_N) for these stars are the same. The zero-shear viscosity (η₀) of the three-arm star is 20% lower than that of the four-arm star. Mixtures of the stars had J⁰_e and G⁰_N unchanged. A $\text{50}\text{50}$ mixture of the three- and four-arm star was diluted with a low molecular weight linear polybutadiene. G⁰_N∝ø²; J⁰_e∝ø^?1 and M_e∝ø^?1, as expected for dilution with a θ-solvent.     

透湿膜的透湿机理与膜的研究概况

基于透湿膜的空气除湿是一种比较新颖的空气除湿方法。本文介绍了各种膜在空气除湿领域的应用情况，结合对膜制备工艺的简要介绍，侧重对原除湿原理，亲水性的高分子纤维素膜，凝胶膜和分子筛无机膜在空气除湿领域的研究和进展进行了分析。     

低压宽温高频铝电解电容器工作电解液

在传统的己二酸铵/乙二醇加水体系中,通过增加水的含量实现高电导率,同时在电解液中添加多种有机高分子物质形成复合添加剂,改善工作电解液的高温稳定性,使电容器上限工作温度扩展到105℃,形成高频宽温低阻抗工作电解液。     

Change in Availability of Mineral and Raw Material Resources as a Result of Scientific and Technical Progress

The tendencies characterizing worsening of natural, mining and technical, as well as mining and geological conditions of deposit mining are analyzed for the last 100 years. The change in prices for mineral raw material is shown, and the influence exerted by scientific and technical progress in the sphere of mining and processing of copper-containing ores is established. An approach to the estimate of available mineral reserves and possibility of their involvement in mining is stated.     

国产550MW水轮发电机用新材料和新工艺

介绍了二滩水电站 5 5 0MW机组发电机定转子绕组方面所采取的新结构、新工艺和新材料     

大型钢制焊接双层低温储罐设计建造

介绍了大型钢制焊接双层低温储罐的结构形式、选材、建造、检验及保冷要求 ,结合所设计的低温液氨储罐 ,对设计建造这类储罐必须考虑的一些问题作了分析     

Facile optical resolution of amino acid esters via hydrolysis by an industrial enzyme in organic solvents

Racemic amino acid esters were optically resolved via hydrolysis in organic solvents by the catalysis of an industrial alkaline protease, “Alcalase”. The products which were composed mainly of L-amino acids were insoluble and easily separated by filtration. The activity of the enzyme and enantiomeric excess of the products were significantly dependent on the nature of solvent and the water content in the reaction media. Generally, high values of enantiomeric excess were obtained at low water contents. Many natural and unnatural amino acids were resolved by this method.     

Ti基MnO_x型DSA析氧电极材料的性能

本文报导了新型 Ti/SnO_2+MnO_x+RuO_2/MnO_x(DSA)电极材料的各种性能,其中包括电极的导电性、表面粗糙度、电化学活性表面积、析氧阳极特性等,并用 X 射线衍射法进行了物相分析、用 SEM观察了表面形貌。确认该电极性能良好,加之成本较低,可作为酸性介质中的析氧电极材料。