对废塑料配煤炼焦产品产率的研究

通过在炼焦煤中添加不同种类、不同比例的废塑料，研究了所得焦炭的性质和焦化产品产率的变化。实验结果表明，焦油和焦炭的产率随着废塑料添加比例的增加而增大，粗苯和氨等产率变化不明显。     

Piperidines As Corrosion Inhibitors for Iron in Hydrochloric Acid

The objective of this work is to provide additional insight on the influence of substituents on heterocyclic piperidine as acid corrosion inhibitors for iron. This series include piperidine and six derivatives. The inhibiting properties of piperidine and these derivatives were investigated in 1 M HCl by potentiodynamic polarization (dc) and electrochemical impedance spectroscopy measurements, and inhibition was found to increases as 26dp < 35dp < 2mp < 3mp < pip < 4bp < 4mp. Polarization curves suggest that they can all be considered as mixed-type inhibitors. An attempt to correlate electronic properties of the compounds with their experimental efficiencies using molecular orbital calculation methods did not show any clear-cut relationship.     

Study on crosslinking of polymers and joining mechanism of SiC ceramic

ABSTRACT

Based on crosslinking of polymers with different vinyl contents at low temperature and pyrolysis of the polymer at high temperature, joining temperature and impregnation cycles of an SiC joint were discussed. Polyvinylphenylsiloxane as the polymer with active groups of Si–OH and CH=CH₂ by crosslinking enhances ceramic yield and thermal stability. The microstructure of the polymer changes from amorphous ceramic into grains of SiO₂ and SiC, grains can dispersion strengthening enhances strength of joint layer. Shear strength of SiC joints reaches the maximum at 1200°C. A relatively good interface between the SiC substrate and pyrolysis product of the polymer is formed, but there exist loose cracks or voids in the joint layer which affect the shear strength of the joint. The shear strength of the SiC joint reaches 69.2?MPa through seven times of vacuum impregnation/pyrolysis enhancement. According to the microstructure and properties of the SiC joint, the pyrolysis mechanism of the joining layer as part of the joint by using polyvinylphenylsiloxane is explained.     

氯油除酸后与二甲胺反应试验研究

通过对氯油加碱除酸后与二甲胺反应试验进行研究 ,氯油脱酸后 ,氯仿对二甲胺收率及DMF对二甲胺收率明显提高 ,为氯油加碱脱酸工业试验提供了依据。     

对甲苯磺酰氨基脲的合成工艺研究

以甲苯、氯磺酸、水合肼、氰酸盐等为原料 ,通过三步反应合成聚丙烯用高效发泡剂对甲苯磺酰氨基脲。研究表明 ,加入一定量的铵盐可提高制备对甲基苯磺酰氯中间体的反应温度 ,从而使其收率增加 ;用四氢呋喃做溶剂比用苯做溶剂可以得到较高产率的对甲基苯磺酰肼中间体 ;反应温度对终产物的收率影响较大。     

利用有机溶剂提取微藻油脂的方法探究

在传统化石能源日益枯竭的趋势下,微藻生物柴油作为第三代绿色可再生的替代型能源越来越受到人们的重视.在微藻生物柴油的产业链上,油脂的提取是影响其推广应用的一个关键环节.本文实验利用有机溶剂提取微藻油脂,探究在不同的条件下微藻油脂的提取效果,并特别研究了先后使用甲醇和石油醚两种有机溶剂对微藻油脂提取率的影响.研究结果表明:温度、液料比、浸提时间对提取效率都有一定的影响,并且使用甲醇和石油醚两种溶剂分步提取时会使微藻油脂提取率明显提高;在液料比为15mL/g、提取温度为45℃、提取时间为5h时,使用石油醚作为提取剂的提取率为58.71%;使用甲醇溶剂提取后再使用石油醚提取时,在液料比和提取时间相同的条件下,温度为35℃时提取率即可达87.90%     

控失尿素在夏玉米上的应用效果研究

通过田间试验,研究了控失尿素在夏玉米上的应用效果。结果表明,控失尿素追施处理比习惯施肥处理667 m2增产68.03 kg,增产率13.7%;控失尿素种肥同播处理比习惯施肥处理667 m2增产48.98 kg,增产率9.9%;控失尿素减量20%不会造成玉米产量下降;施用控失尿素可显著提高氮肥利用率。     

量子化学方法应用于分子筛上苯与短链烯烃反应机理的研究进展

对近年来基于量子化学方法研究苯与短链烯烃烷基化反应机理的进展进行了综述。简要介绍了量子化学方法的相关软件及其应用。对于苯与短链烯烃发生烷基化时存在争议的协同机理和分步机理, 详细阐述了采用大小不同模型和计算方法对其进行研究的进展;由此可以展望量子力学/分子动力学(QM/MM)组合方法综合了量子化学理论和分子动力学理论的优点, 将成为研究化学反应机理的更有效方法。