共查询到19条相似文献,搜索用时 78 毫秒
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提出了连续多级蒸发精制双酚A的简易计算方法。按拉乌尔-道尔顿定律编制了在苯酚蒸发时的算图。可以直接观察压力、温度与关键组分之间的关系。 相似文献
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范淑敏 《精细与专用化学品》2004,12(13):30-31
面对国内市场双酚A销售持续疲软的态势,无锡树脂厂积极谋求出口,力争在国外市场获得销路,此举初见成效,自2 0 0 4年4月以来该厂已出口双酚A 2 80 0t。早在2 0 0 3年年底,该厂就开始着手对双酚A国际市场进行调研,掌握价格变化规律,为双酚A打入国际市场做好前期准备。2 0 0 4年年 相似文献
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针对传统的精馏法、结晶法及刮膜蒸发法脱酚工艺存在的诸多弊端,有必要对新的脱酚工艺进行研究,以制备超低游离酚质量分数的聚碳级双酚A。鉴于双酚A-苯酚物系高沸点、热敏性特性,文中以降膜蒸发脱除大部分苯酚、获得的粗双酚A为原料,采用向真空填料塔通入过热水蒸气进行气提的方法,研究制备超低游离酚质量分数聚碳级双酚A的脱酚工艺。研究结果表明:气提塔的操作压力、水蒸气温度和流量对脱酚效果有很大的影响。操作压力越低,组分间相对挥发度增大,脱酚效果越好。但过低的压力对脱酚效果的改善将不明显,带来的负面影响是设备投资的增加;水蒸气温度越高,塔内物料温度也随之升高,苯酚的饱和蒸汽压增大,脱酚效果越好;水蒸气流量越大,在操作压力不变的情况下,苯酚的气相分压就越低,脱酚效果越好。适宜的工艺条件是:操作压力为4.0—5.0 kPa;气提水蒸气温度185—190℃,流量为处理量的2%。 相似文献
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对反应过程所需催化剂种类及其各影响因素进行了考察。研究表明,大孔强酸性离子交换树脂可替代无机酸作为催化剂用于该反应,其中以未经硫基化处理者为佳;原料中水分的存在不利于产物收率和质量,应控制水的质量分数在1%以下。本研究确定的较佳工艺条件为反应温度65℃,停留时间15min、苯酚/对-异丙烯基苯酚摩尔比20,对应的反应收率为98.5%。对双酚A副产物的处理提供了有效方法。 相似文献
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Hajime Kimura Akihiro Matsumoto Kiichi Hasegawa Keiko Ohtsuka Akinori Fukuda 《应用聚合物科学杂志》1998,68(12):1903-1910
Bisphenol A based benzoxazine was prepared from bisphenol A, formaline, and aniline. This benzoxazine was used as a hardener of the epoxy resin. Curing behavior of the epoxy resin and the properties of the cured resin were investigated. Consequently, curing reaction proceeded without a curing accelerator. The molding compound showed good thermal stability under 150°C, which corresponded to the temperature in the cylinder of injection molding. Above 150°C, the curing reaction proceeded rapidly. The cured epoxy resin showed good heat resistance, water resistance, electrical insulation, and mechanical properties compared with the epoxy resin cured by the bisphenol A type novolac. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1903–1910, 1998 相似文献
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A novel solid acid for synthesis of bisphenol A 总被引:2,自引:0,他引:2
Lijie Hou Qinghai Cai Bin Lu Xuemei Li Xue Xiao Yuanyuan Han Shuhan Cui 《Catalysis Letters》2006,111(3-4):153-157
A novel solid acid was prepared from boric, phosphorous and sulfuric acid by a simple method, and characterized by FT-IR,
XRD and TG. Surprisingly, the prepared solid acid is an effective catalyst for the synthesis of bisphenol A from condensation
of phenol with acetone. The high conversion of acetone (91.8%) and selectivity of bisphenol A (93.4%) were achieved in the
presence of the novel catalyst. 相似文献
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F. Javier Rivas ngel Encinas Benito Acedo Fernando J. Beltrn 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(4):589-594
BACKGROUND: Endocrine disruptors, as in the case of bisphenol A (BPA), are increasingly found in aqueous effluents. The degree of mineralization of a bisphenol A (BPA) aqueous solution after applying several oxidation treatments has been investigated. RESULTS: UV‐C photolysis of BPA allowed calculation of the quantum yield, ϕλ=254 = 0.045 ± 0.005 mol Einstein−1 but only 15% of the initial organic carbon content (TOC) was eliminated. Better results (80% conversion) were obtained after TiO2 addition. Ozone inmediately reacts with BPA. Again, TiO2 addition in the presence of O3 was capable of increasing the mineralization level (60%). The photolytic ozonation of BPA was capable of completely eliminating TOC. The presence of activated carbon in the O3/UV and O3/UV/TiO2 systems significantly enhanced the TOC removal reaction rate (100% conversion in 20 min). CONCLUSIONS: Processes such as ozonation or photolysis are capable of efficiently removing BPA from water however, mineralization levels are rather low. Addition of TiO2 to O3 or UV‐C significantly enhances TOC removal. The remaining organics still account for an average 20–40% of the initial organic carbon. The combination of O3/UV‐C is capable of completely mineralizing BPA. Activated carbon and/or TiO2 addition to the system O3/UV‐C improves the TOC depletion rate. Copyright © 2008 Society of Chemical Industry 相似文献