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用气相色谱法测定1,3-二氯-2-丁烯的氯化产物,采用301釉化担体:阿皮松L:聚乙二醇-20M-2-硝基对苯二甲酸=100:10:0.8(质量比)的固定相填充柱分离了氯化产物中16个组分。用色谱-质谱联用法鉴定这些组分为2,3,4-三氯-1-丁烯、2-甲基-3,3,3-三氯-1-丙烯、1,2,3,3-甲氯丁烷、1,2,3,3,4-五氯丁烷等。用面积归一化法计算出了氯化产物中各组分含量。 相似文献
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本文研究了在甲醇和氨水的水溶液里,手性的(+)-diop-Rh(Ⅰ)复合物(diop:2,3-邻-异亚丙基-2,3-二羟基-1,4-双(二苯膦基)丁烷)作为不对称催化剂,粉末半导体CdS、TiO_2、Pt/CdS和Pt/TiO_2为光催化剂,用500WXe灯光照10h,3-甲基-2-氧代丁酸光催化不对称合成L-α缬氨酸已经实现,光学纯度最高达64%e.e.。 相似文献
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许文松 《高校化学工程学报》1995,(2)
研究了由3-氯-4-氟硝基苯气相氯化合成2.4-二氯氟苯的影响因素。在558~659K温度范围内测定动力学数据,根据实验数据得到反应速率方程式为k=1.244×105exp(-6285/T) 相似文献
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Mechanoluminescent (ML) studies were investigated for double cantilever beam (DCB) and tapered-DCB (TDCB) tests, and the following information was recorded. (1) The ML behavior on the top surface of the adherend perfectly synchronizes the shape of the failure front at the bond line. Thus, ML sensing can be utilized as a monitoring indicator of the behavior and fracture toughness at a crack frontline from outside the adherend. (2) The failure front of a DCB specimen under dissimilar material bonding, consisting of CFRP and CFRTP in particular, can be visualized and considered as a winding line. (3) The failure process zone (FPZ) on the bond line for DCB and TDCB specimens was successfully visualized based on the mechanoluminescence, and the area of the TDCB specimen was determined to be much longer than that of the DCB specimen. 相似文献
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介绍了以苯酚为原料,在定向氯化催化剂的作用下,直接一步制备医药中间体2,6-二氯苯酚的方法.在最佳配比苯酚:溶剂:催化剂为1:3.5:.003(质量比),反应温度105~110℃下,通入理论量105%的氯气,得到的2,6-二氯苯酚的收率为92.1%,产品纯度99.5%以上. 相似文献
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利用热重-红外光谱联用(TG-FTIR)、气相色谱(GC)、气相色谱-质谱(GC-MS)联用等分析测试手段对一种有机防火封堵材料热解后产生的烟气进行分析。热重-红外联用(TG-FTIR)分析表明在有氧和限氧条件下,热解产生的烟气都以二氧化碳为主要组分,原因可能是因为CO2主要来源于部分无机成分的分解和有机成分的脱羧反应,所以CO2的产生受氧气含量的影响较小。利用气相色谱和气相-质谱联用(GC-MS)技术,在对700℃有氧条件下产生的烟气进行全面的成分和含量分析后,测定出了21种气体组分,并对其中可能对火灾救援工作和周围环境产生不利影响的气体进行了安全性评价,用以表明这种有机防火堵料的使用在火灾中可能会暴露的一些潜在危害,为以后有机防火封堵材料的研发和改良提供一定的参考。 相似文献
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Claudia Amorim Mark A Keane 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2008,83(5):662-672
BACKGROUND: Catalytic hydrodechlorination (HDC) is a progressive approach to treating chlorinated waste streams. While carbon is widely used as a catalyst support, the influence of carbon surface functionality on HDC performance has not been established. This work sets out to assess the impact of surface acid groups associated with activated carbon (AC), graphite and graphitic nanofibers (GNF) on Pd promoted gas phase HDC of chlorobenzene (CB) and 1,3‐dichlorobenzene (DCB). RESULTS: The acid groups were introduced by HNO3 washing and the HDC reaction performed over bulk Pd and Pd physically mixed with each carbon. The carbon was subjected to a thermal treatment to remove the surface acidity. Characterization was by temperature programmed decomposition (TPD), temperature programmed hydrogen treatment (TPH), BET area, acid‐base titration, scanning and transmission electron microscopy. TPD, TPH and titration analyses served to establish the presence of surface oxygen groups after acid washing and facilitated an evaluation of the effectiveness of the thermal treatment to remove these groups. CONCLUSIONS: The surface acid groups inhibited HDC activity, a response most pronounced for Pd + AC, less so for Pd + graphite, while the effect was slight for Pd + GNF. HDC inhibition is attributed to chloroarene interaction with the surface functional (notably carboxylic) groups that impedes HDC. Fractional dechlorination of DCB was equivalent to or lower than CB HDC; there is some evidence of DCB interactions with heat treated graphite and GNF that served to raise HDC activity. Effective HDC over carbon based catalysts requires removal of surface acid groups. Copyright © 2008 Society of Chemical Industry 相似文献
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应用固相微萃取法(SPME)富集结合GC-MS分离检测技术,研究了品牌香皂中的挥发性成分,并采用气相色谱一嗅觉检测(GC一())技术对品牌香皂中的呈香化合物进行了筛选和鉴定。分析结果表明,HS-SPME-GC-MS与GC-O芳香萃取物稀释分析(AEDA)方法相结合不仅能分析被试样品的组成,还可用来鉴别香皂中呈香化合物的类别、香气强度及各自对总体香气的贡献。 相似文献
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为了研究阻燃增塑剂氯化石蜡、增强剂炭黑N330、轻质氧化镁对CPE防水卷材热老化性能的影响规律,对老化前后的试样进行拉伸、热重分析(TGA)和红外光谱分析等测试,并运用非等温动态热重分析法对最优配方的防水卷材进行寿命估算.结果表明:增塑剂迁移是CPE防水卷材热老化的主要因素,氯化石蜡的最佳用量是15份;轻质氧化镁在非硫... 相似文献
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介绍了一种快速测定乙烯裂解产物气体组分含量的方法.采用多维气相色谱方法,4阀7柱的配置,3通道并行,3检测器检测,通过阀切换及柱反吹技术,实现所有组分的快速分离检测.结果表明,该方法具有速度快、效率高、易操作、结果准的优点. 相似文献