以杂多酸为催化剂合成乙二醇-乙醚的研究

研究了杂多酸催化无水乙醇和环氧乙烷(EO)制备乙醇乙醚的醚化反应,考察了不同种类的杂多酸以及醚化反应工艺条件对反应活性和选择性的影响.结果表明,PW_(12)催化剂的反应活性高、反应温度低、选择性好,当用PW_(12)作催化剂,乙醇与环氧化乙烷之比为3.0(mol),反应温度45℃,反应时间1h时,转化率和选择性均超过97%.     

EO/EG装置生产过程中有机酸的生成原因分析

分析了环氧乙烷，乙二醇装置工艺系统中有机酸生成的原因．指出在银催化剂作用下，乙烯氧化过程有机酸生成主要成分是甲酸和乙酸，银催化剂不是影响氧化反应器出口醛含量的主要因素；杂质、温度等对反应器出口气中的醛含量有重要影响，也直接影响到装置前系统的有机酸含量；乙二醇后系统中有机酸的增加仅取决于两级吸收及解析工艺的稳定操作。     

高矣物的特性对双水相相图和头孢氨苄及7-ADCA分配行为的影响

A series of ethylene oxide(EO)-propylene oxide (PO) random co-polymers (EOPO) were used to form aqueous two-phase systems (ATPS) with ammonium sulfate.Effects of EOPO′s properties on the phase separation behaviors and on the partition of cephalexin and 7-aminodesacetoxicephalosporanic acid(7-ADCA) in ATPS were investigated.Both the molar mass and molar ratio of EO to PO of EOPO could greatly influence partition behaviors of cephalexin and 7-ADCA as well as the binodal curve of ATPS. With the increase of molar mass of co-polymer or the decrease of molar ratio of EO to PO,the critical point of ATPS decreased,the binodal curve became more asymmetry,and both cephalexin and 7-ADCA followed the same tendency to partition into the polymer-poor bottom phase.The experimental results shows that it is feasible to partition cephalexin and 7-ADCA in either the polymer-rich top phase or the polymer-poor bottom phase by choosing a specific phase-forming EOPO.     

嵌入极值优化的混合粒子群优化算法

针对标准粒子群算法容易陷入局部极值和精度低的问题,提出一种嵌入极值优化算法的粒子群优化算法。在线性下降的惯性权重粒子群算法运行过程中,间隔一定迭代次数与极值优化算法相结合,利用其波动性增加种群的多样性,并有效结合粒子群算法较强的全局探索能力和极值优化算法精细的局部搜索性能,以较高精度收敛到全局极值。仿真实验结果表明,该混合算法是一种求解高维多峰连续函数极值的有效方法。     

紫外光电探测器研制

采用宽带隙半导体材料SiC,进行紫外光电探测器的制备。基于机械性能和化学稳定性考虑,增透抗反膜的制备采用SiO2＋Al2O3工艺,同时对其表面钝化层和增透抗反膜工艺进行了研究讨论。     

农药微乳剂浊点的研究

以高效氯氰菊酯微乳剂为例,对由几种不同表面活性剂所形成的微乳剂浊点进行测定,并测了不同助表面活性剂含量时的浊点。分析讨论了影响微乳剂浊点的主要因素及其影响规律。结果表明,表面活性剂的EO加成数增加,微乳剂浊点随之升高;助表面活性剂种类及用量对浊点的影响都很大,其中乙醇、DMF对浊点都有明显的升高作用,而正丁醇可明显降低浊点,乙腈随含量的增加对浊点的影响先升高后降低。     

Effect of graft copolymer matrix prepared by reversible addition–fragmentation chain transfer and atom transfer radical polymerization on the electro‐optical properties of polymer‐dispersed liquid crystals

A type of graft macroinitiator, synthesized by reversible addition–fragmentation chain transfer (RAFT) and atom transfer radical polymerization, was employed to prepare polymer‐dispersed liquid crystals (PDLCs) with graft copolymer matrix; meanwhile, a linear macroinitiator was also synthesized via RAFT polymerization. The effect of linear and graft macroinitiators on the electro‐optical (EO) properties of the PDLCs was investigated. The results showed that the graft macroinitiator could make a large difference to the EO properties of the PDLCs. The memory effect was reduced remarkably, but the driving voltage increased and transmittance decreased. A possible mechanism is presented. © 2014 Society of Chemical Industry     

Aspen Open Solver接口技术研究

以Aspen Open Solver接口集中的非线性代数方程组(NLA)部分作为研究对象,在对接口集进行系统地分析之后,利用AspenTech提供的接口代码将分别基于梯度和非基于梯度的四种求解算法嵌入生成solver组件,并实现用Aspen Plus调用该solver组件观察各种算法嵌入的结果.     

Antifungal,antiaflatoxin and antioxidant potential of chemically characterized Boswellia carterii Birdw essential oil and its in vivo practical applicability in preservation of Piper nigrum L. fruits

The study explores the chemical profile, antimicrobial and antioxidant activity of Boswellia carterii essential oil (EO). The EO significantly inhibited growth and aflatoxin production by the food borne toxigenic strain of Aspergillus flavus at 1.75 μl/ml and 1.25 μl/ml respectively. It exhibited broad fungitoxic spectrum against 12 food borne moulds and also showed strong antioxidant activity, IC₅₀ value and % inhibition of linoleic acid peroxidation being 0.64 μl/ml and 51.68% respectively. The antifungal action of EO was observed in terms of reduction in ergosterol content of plasma membrane of A. flavus. As fumigant in food system in storage containers, the EO provided 65.38% protection against fungal deterioration of Piper nigrum. GC–MS results revealed 31 components of EO. The chemically characterized B. carterii EO may thus be recommended as plant based preservative in view of its antifungal, antiaflatoxigenic, antioxidant activity and efficacy in food system.     

脂肪酸聚氧乙烯醚合成反应的动力学研究(四)——强碱催化环氧乙烷加成速率的变化规律

本文在前文基础上,从强碱催化非等速率离子反应机理的产物分布公式出发,推导出反应过程中环氧乙烷耗量及加成速率随时间变化的关系方程,并通过实验数据加以讨论,结果表明,本文推导出的关系方程从动力学角度能够较好地反映乙氧基化反应的真实规律。