共查询到20条相似文献,搜索用时 109 毫秒
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概述了2,2′,6,6′-四氯双酚A的应用和合成工艺。详细研究了双酚A在二氯乙烷溶剂中经氯化反应合成2,2′,6,6′-四氯双酚A,得到了最佳合成工艺条件,收率可达915%,为工业化生产提供了可靠的基础数据 相似文献
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三氯化磷法合成O-(1,2,2,2-四氯乙基)硫代磷酰二氯的工艺研究 总被引:1,自引:0,他引:1
研究了以三氯化磷、一氯化硫为原料合成O (1,2,2,2 四氯乙基)硫代磷酰二氯的工艺,讨论了温度、催化剂、反应时间、原料摩尔比等对反应的影响,获得了较好的工艺条件为:原料摩尔配比PCl3∶S2Cl2∶CCl3CHO∶催化剂B=31∶2∶1∶075;反应温度-8~-4℃;反应时间9h;收率达6653%。 相似文献
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2,5-二甲基苯酚的合成研究 总被引:1,自引:0,他引:1
介绍了磺化、碱熔法合成2,5 二甲基苯酚的工艺条件,讨论了影响磺化、碱熔收率的一些因素。磺化最佳条件为142~145℃下反应4h,碱熔最佳条件为320~330℃下反应2h。反应的总收率为773%,2,5 二甲基苯酚的纯度(w)达983%。 相似文献
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以2,3,4,5 四溴邻苯二甲酸酐和二丁基氧化锡为原料,以四氢呋喃为溶剂,于60℃反应16h。合成了2,3,4,5 四溴邻苯二甲酸二丁基锡,其产率可达838%。产物用1HNMR、13CN MR、IR及元素分析进行了表征。 相似文献
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通过丁二酸酐、可分散的纳米二氧化硅与壳聚糖脱水合成了壳聚糖/DNS杂化材料。通过FTIR和热重分析等方法对杂化材料进行了表征。FTIR表明壳聚糖与DNS通过丁二酸酐桥连为一个高分子聚合物;热重分析结果表明,杂化材料的热性能有较大提高。考察了壳聚糖及杂化材料微粒吸附Pb2+时吸附条件对吸附率的影响,结果表明,其吸附最佳条件为:pH=5,吸附时间为120 min,吸附剂的投加量为0.1 g。杂化材料的吸附率达49.16%,与壳聚糖同样具有甚至更强的吸附Pb2+的能力。 相似文献
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Interaction studies of clayey materials with heavy metals have been carried out at different experimental conditions to evaluate their suitability as geological barrier of landfills. For this purpose, five raw materials, usually quarried for brick making, having different mineralogical composition and geochemical and physical–chemical properties were selected. The interactions between zinc (II), lead (II), cadmium (II) and chromium (III) ions and the clayey materials were studied in solutions that simulate the characteristics (composition, majority components) and conditions of leachate from municipal solid waste landfills in the acetogenic stage (young leachate) and methanogenic stage (old leachate). Batch experiments were used to study the retention of metals on clayey materials as function of pH in non-competitive and competitive conditions. Moreover, adsorption isotherms for all the assayed metals and materials were calculated. All the clayey materials displayed lower metal sorption capacity in the young leachate conditions. The clayey materials displayed greater sorption capacity for zinc (II) and chromium (III) whereas lower sorption capacity was observed for cadmium (II). The abundance of clay minerals, carbonate content, specific surface area and the presence of smectites control the metal retention capacity of the clayey material. The obtained results showed that the selected clayey materials are suitable as components of the multibarriers in controlled urban landfills. 相似文献
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以一水合硫酸氢钠为催化剂,间苯二酚和乙酰乙酸乙酯为原料,通过Pechmann缩合反应,在无溶剂条件下合成了7-羟基-4-甲基香豆素。探讨了反应温度、反应时间、催化剂用量及原料配比等因素对产品收率的影响。实验表明,一水合硫酸氢钠是合成7-羟基-4-甲基香豆素的良好催化剂,正交实验法得出反应的最优条件为:反应温度为110℃,反应时间40min,/Z(间苯二酚):n(乙酰乙酸乙酯)=1:1.2,催化剂用量为0.300g(间苯二酚物质的量为0.010mol)时,产品的收率为81.3%。 相似文献
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以模拟的费托合成高温油相产品为原料,采用尿素包合法从原料中分离正构烃。考察了活化剂的种类、包合反应条件、解包合反应条件等对正构烃分离效果的影响。通过正交实验研究,结果表明:乙醇为较适宜的活化剂;较优反应条件为反应温度5℃,反应时间60min,以1g原料为基准,尿素用量2.75g,乙醇用量3.5mL,水用量1.125mL。在此包合反应条件下,得到1-癸烯的回收率为87.75%,正癸烷的回收率为89.90%。尿素包合物的解包合反应实验结果说明,水的存在有利于解包合反应的进行,得到正构烃回收率较高。用水量为100 mL时,尿素包合物的解包合反应基本完成。 相似文献
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《The Journal of Supercritical Fluids》2007,42(3):404-411
In this study, carbon materials syntheses using a dielectric barrier discharge (DBD) microplasma in supercritical carbon dioxide (scCO2) environments are reported. The dependencies of the carbon materials synthesis processing on the environmental temperature, environmental pressure and power frequency were investigated. In contrast to atmospheric-pressure CO2 environments, in which no carbon materials could be fabricated, it was possible to fabricate various carbon materials, such as amorphous carbon, graphite and nanostructured carbon materials, using scCO2 as a processing medium and a raw starting material. In particular, in the vicinity of the critical point of CO2, the quantity of carbon nanostructured materials, such as carbon nanotubes and carbon nanohorns, was larger than under other scCO2 conditions. It is supposed that the high density and molecular clustering caused by supercritical conditions may affect the formation of such carbon nanostructured materials. In addition, we found that by varying the power frequency, the form of the synthesized carbon materials could be changed. 相似文献