Kinematic Viscosities for Ether + Alkane Mixtures: Experimental Results and UNIFAC-VISCO Parameters

Kinematic viscosities for the binary mixtures of diisopropylether, dibutylether or methyl ter-butyl ether with 3-methylpentane, hexane or heptane have been measured at 283.15 K, 298.15 K, and 313.15 K. The experimental values have been correlated by the McAllister equation. Using these results, new UNIFAC-VISCO parameters, O_ether−CH₂ and O_ether−CH₃, have been calculated.     

浅谈双向网改造技术方案

在进入“三网融合”的今天,全国广电网络面临着从单向单一的数字电视传输网络改为双向多功能多业务网,本文就以湄潭县城区有线电视传输网为例,根据目前网络实际情况出发,简单介绍几种进行低成本、高效率的双向改造组网方式,为了给更多的用户提供更加多的双向业务,建立稳定可靠、可运营、可持续发展的广电双向网络,最终达到三网融合。     

气相色谱法测定双胺醚含量

用气相色谱热导检测,以H_2为载气,聚乙二醇-20M为固定液,固定相为涂布有KOH的6201红色担体,苯甲酸甲酯为内标,准确而方便地测定了双胺醚含量。     

高纯度大豆粉末磷脂的制取新工艺研究

用两种溶剂，两次浸出新工艺制取高屯度粉末磷脂，先将溶有大磷脂，大豆油及脂肪酸的己烷溶液蒸馏，蒸出己烷溶剂后，再用丙酮将油及脂肪酸萃取出去，余下高纯度粉末磷脂。     

Predication of Atmospheric VLE for the Binary System Diethyl Oxalate-Ethanol by Using Visual Basic

The atmospheric vapor-liquid equilibrium system of diethyl oxalate-ethanol was reproduced through the visual basic ( VB6.0) computer language by using the Wilson, NRTL and the UNIFAC equation . The results of the three methods are all that could be desired. The calculated results of three different models are in perfect agreement with experiment data. The calculated results of UN1FAC equation is the optimum in several models . So the results can be used for chemical engineering calculation.     

Synthesis of polyacrylonitrile via reverse atom transfer radial polymerization (ATRP) initiated by diethyl 2,3‐dicyano‐2,3‐diphenylsuccinate,FeCl3, and triphenylphosphine

The reverse atom transfer radical polymerization (RATRP) technique using FeCl₃/triphenyl‐phosphine (PPh₃) complex as a catalyst was applied to the living radical polymerization of acrylonitrile (AN). A hexa‐substituted ethane thermal iniferter, diethyl 2,3‐dicyano‐2,3‐diphenylsuccinate (DCDPS), was first used as the initiator in this iron‐based RATRP initiation system. A FeCl₃ to PPh₃ ratio of 1:3 not only gives the best control of molecular weight and its distribution but also provides a rather rapid reaction rate. The rate of polymerization increases with increasing the polymerization temperature and the apparent activation energy was calculated to be 54.9 kJ mol^?1. Because the polymers obtained were end‐functionalized by chlorine atoms, they were used as macro‐initiators to proceed the chain extension polymerization in the presence of an FeCl₂/PPh₃ catalyst system via a conventional ATRP process. Copyright © 2005 Society of Chemical Industry     

Cyclisation of Alkynyl Alcohols and Carboxylic Acids Mediated by N-Heterocyclic Carbene Copper(I) Complexes

The cyclisation of alkynyl alcohols and carboxylic acids in the presence of a [Cu(NHC)₂]X complex is reported. The reactions were carried out in technical grade toluene in the presence of air with a catalyst that is readily accessible. N-Heterocyclic carbenes are recognised for stabilising metal centres in a range of oxidation states, and this work further supports that NHCs can also be used as activation sites in air and moisture stable yet active catalysts.     

气相催化合成草酸二乙酯新工艺

报道了以 NO为起始原料 ,与乙醇气相合成亚硝酸乙酯 ,进而与 CO气相催化偶联合成草酸二乙酯的新工艺。该工艺与传统合成草酸二乙酯工艺比较 ,具有原料来源广、便宜 ,反应条件温和 ,选择性高 ,过程无污染等优点 ,具有广阔的工业前景。     

镧系元素六氟磷酸盐二乙基亚砜配合物的合成及其表征

本文在无水甲醇溶剂中合成了十五个新的镧系元素二乙基亚砜配合物,并对其进行了组成分析、X射线粉末衍射、红外光谱、光电子能谱、摩尔电导测定,确定其化学结构式为Ln(DES-O)_n(PF_6)_3〔Ln=La,n=7.5;Ln=Ce-Lu.Pm除外,Y,n=7〕。     

采前喷施胺鲜酯对采后龙眼果实贮藏期间果皮膜脂代谢的影响

为研究采前喷施胺鲜酯（diethyl aminoethyl hexanoate,DA-6）对采后龙眼果实贮藏期间果皮膜脂代谢的影响,以‘福眼’龙眼为实验材料,在龙眼盛花期后70、90、110 d用10 mg/kg DA-6溶液各喷施龙眼果实1 次,以蒸馏水喷施为对照。龙眼果实在盛花期后120 d采收,采后龙眼果实经过挑选、清洗和晾干后用厚度为0.015 mm的聚乙烯薄膜袋密封包装（每组50 袋,每袋50 个）,在（28±1）℃、相对湿度85%条件下贮藏。结果表明：采前喷施DA-6可延缓采后龙眼果实贮藏期间果皮细胞膜透性的增加,降低果皮脂氧合酶、脂酶和磷脂酶D等膜脂降解酶活力,延缓果皮膜磷脂（磷脂酰胆碱（phosphatidylcholine,PC）、磷脂酰肌醇（phosphatidylinositol,PI））和不饱和脂肪酸（油酸（C18:1）、亚油酸（C18:2）、亚麻酸（C18:3））的降解,保持较高的PC和PI含量及脂肪酸不饱和指数、脂肪酸不饱和度,保持较低的磷脂酸含量,维持正常细胞膜区室化功能和结构。因此,采前喷施DA-6增强采后龙眼果实耐贮性与采前喷施DA-6能有效降低采后龙眼果实贮藏期间果皮膜脂代谢有关。