基于遗传神经网络的电液伺服系统自适应控制

针对热连轧卷取机卷取过程当中的带头损失现象，本文提出一种液压踏步控制的伺服系统。采用神经网络跟踪对象的动力学特性，建立了遗传算法与神经网络相结合的识别模型（GA-ANN），利用遗传算法进行网络权系的训练和优化。试验证明该系统有好的控制效果，对实现液压系统的人工智能化奠定了基础。     

四氟苯甲醚菊酯的合成

以四氯对苯二甲氰为原料,经过氟化、水解、酰氯化、还原、卤化、醚化6步反应合成四氟对甲醚基苄醇,再与二卤菊酰氯缩合得四氟苯甲醚菊酯反应总收率在39％以上,含量达95％。     

ETA及其反应产物阳离子淀粉在油田化学品中的开发应用

对 2 ,3 环氧丙基三甲基氯化铵 (ETA)的结构和性质及以ETA和玉米淀粉为原料合成阳离子淀粉的方法进行了简要介绍。同时讨论了醚化剂用量和碱的用量对取代度和反应效率的影响 ,确定了合成阳离子淀粉反应的最佳碱催化剂用量为 1%。最后对ETA和阳离子淀粉在油田化学品 ,如钻井液处理剂、油田水处理剂、粘土稳定剂以及其他方面的一些应用性能进行了评价。     

A study on isothermal cure behavior of an epoxy-rich/anhydride system by differential scanning calorimetry

Cure behavior of a catalyzed epoxy/anhydride system was investigated for an epoxy-rich formulation using differential scanning calorimetry (DSC). The mixture was isothermally cured at different times and temperatures, and the cure behavior of the samples was analyzed by the peak exothermic temperature (T_peak) and the extent of cure reaction (X) from DSC thermograms. For the excess epoxy sample, two exothermic peaks at a low temperature from esterification reaction and at a high temperature from etherification on DSC curves appeared in the early stage of cure and shifted to a lower temperature scale with curing. However, the esterification peak disappeared and the remaining etherification peak shifted to a higher temperature with further cure. The shift of the peaks may be attributed to the change of reaction mechanism from kinetically controlled to diffusion-controlled. The extent of cure of esterification and etherification was also considered separately in this article. The result shows that esterification reaction mainly occurs in the early stage of cure and then etherification slowly proceeds after the completion of the esterification. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1101–1108, 1998     

乙基叔丁基醚合成技术进展

乙基叔丁基醚(ETBE)是一种性能优良的高辛烷值汽油调和组分.综述了国外几种典型的ETBE生产工艺流程以及国内ETBE合成技术的研究现状.目前国外ETBE生产技术已经成熟,建议国内应加快研究开发并实现产业化.指出采用催化蒸馏技术和渗透蒸发膜分离回收乙醇技术将成为今后的发展方向.     

玉米麸质阿拉伯木聚糖的疏水改性

从玉米麸质中提取了半纤维素阿拉伯木聚糖(AX),以1-溴代丁烷、1-溴代十二烷、1-溴代十六烷为烷基化试剂,通过醚化反应制备了疏水改性阿拉伯木聚糖(Cn-AX)。采用傅里叶红外光谱和1H NMR表征了改性阿拉伯木聚糖的结构。利用流变仪研究了改性前后阿拉伯木聚糖水溶液的粘度性质,发现疏水改性阿拉伯木聚糖水溶液由于长碳链的聚集,粘度显著升高。     

催化裂化轻汽油醚化新工艺研究

研究了催化裂化轻汽油预处理及深度醚化工艺。结果表明，经过预处理，碱性氮脱除率可达80％以上，二烯烃脱除率达90％以上，叔碳烯烃收率接近100％。原料经预处理后，醚化催化剂寿命大大延长。经过深度醚化，叔碳烯烃总转化率达70％以上，催化裂化全馏程汽油的研究法辛烷值提高2．1个单位，蒸气压下降10．8kPa，烯烃含量减少9．36个百分点，含氧量达2．0％。     

Quaternization and anion exchange capacity of Sponge Gourd (Luffa cylindrica)

Gourd (Luffa cylindrica) was converted into an anion exchange material through its etherification using 2‐chloroethyldiethylamine hydrochloride (CEDA‐HCl) followed by crosslinking using epichlorohydrin. The effects of the different etherification reaction parameters (CEDA concentration, NaOH concentration, and temperature) on the extent of modification were followed up by elemental analysis of nitrogen to optimize the reaction. The effect of the etherification on the supramolecular structure was followed by the X‐ray diffraction. The ability of the crosslinked diethylaminoethylated luffa (DEAE‐luffa), after its quaternization with methyl iodide, to adsorb sulfate, nitrate, and phosphate anions was tested. The crosslinked DEAE‐luffa showed higher affinity toward phosphate anions followed by sulfate and nitrate. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2495–2503, 2006     

轻汽油醚化技术在FCC汽油改质中的作用

报道FCC轻汽油馏分中的C5、C6叔烯烃与甲醇进行醚化反应转化为甲基叔戊基醚、甲基叔己基醚,降低汽油中烯烃含量的催化蒸馏中型试验,结果表明,将醚化油按自然比例与催化裂化重汽油馏分混合后,汽油的烯烃含量约降低5－9个百分点,蒸气压显著降低,抗爆指数提高1个单位以上。     

高疏水性染料的制备及其对超高分子量聚乙烯织物的染色性能

为解决常规染料难以上染超高分子量聚乙烯(UHMWPE)纤维的问题,以1-羟基-4-对甲苯氨基蒽醌和卤代烃为原料,通过威廉姆森醚化反应制备了3种具有高疏水性的紫色改性染料1-对甲苯氨基-4-蒽醌己基醚、1-对甲苯氨基-4-蒽醌癸基醚和1-对甲苯氨基-4-蒽醌十四烷基醚,并采用高温高压染色工艺对UHMWPE织物进行染色.通...