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《精细与专用化学品》2016,(3)
提出了一种磺化废硫酸资源化处理工艺,考察了该工艺过程中几种脱色剂的脱色效果。结果表明,作为吸附剂,活性炭比煤粉具有更优的脱色效果,活性炭脱色后的硫酸铵溶液色度小于10倍,但是采用煤粉作为脱色剂吸附有机物后可直接进入锅炉焚烧,省去了再生操作。脱色吸附剂应根据各企业的实际情况选定;同时考察了几种市售絮凝剂的脱色效果,提出了膜过滤和吸附相结合的脱色工艺方案。 相似文献
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在采用溶剂萃取法净化湿法磷酸时,磷酸中的有色杂质会与萃取剂作用,干扰萃取过程,因此有必要事先对磷酸进行脱色处理.对4种活性炭的脱色及再生性能进行了研究,用间歇实验筛选出了一种脱色性能好、磷损失小的活性炭.并用玻璃吸附柱进行连续吸附实验,测定了其初始脱色率和最佳用量,以及经过1次再生和2次再生的再生率和最大脱色率.实验结果表明,新炭的最佳用量为1 kg原酸用12.9 g新炭,脱色率为72%;1次再生的活性炭再生率为99.5%,脱色率达到新炭的95%.适用于湿法磷酸脱色的活性炭是颗粒状、比表面积大、孔隙体积大和平均孔径大的一类产品. 相似文献
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以磷酸三丁酯(TBP)脱色后的粉末废活性炭(WAC)为材料,利用高温热解的方法,以亚甲基蓝吸附量和碘值为评价指标,研究了再生温度、再生时间、再生次数对废活性炭再生效果的影响。实验结果表明,WAC的再生最优条件为500℃下再生90 min,再生4次仍能恢复其82%的亚甲基蓝吸附性能及67%的碘吸附性能。通过同步热分析仪(TG-DSC)测定活性炭的失重、吸热和放热情况;借助比表面积及孔径分析仪、傅里叶红外光谱仪(FT-IR)、扫描电子显微镜(SEM)等测试手段对再生前后的活性炭进行表征,从而验证其再生效果。对废活性炭的热解机理进行了综合分析,为湿法磷酸净化工艺流程中磷酸三丁酯脱色活性炭的热解再生提供了理论指导。 相似文献
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活性炭在工业上被广泛用作吸附剂,有粉状和粒状两种。粉状活性炭吸附装置比较简单,操作方便,吸附速度快,脱色能力强,但再生比较困难;而粒状活性炭机械强度高,容易与水分离,再生方便。本文以活性炭对SMZ生产过程中的反应波进行了脱色试验。 相似文献
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本文讨论了785—2药用活性炭脱色后的废炭,经过再生处理后,它的吸附性能、孔分布、微孔容、亚甲基兰脱色等的变化,以及它对没食子酸的脱色效果。 相似文献
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以丁二酸发酵液为研究体系,采用静态吸附法研究了颗粒活性炭对丁二酸发酵液色素的吸附过程;并考察了搅拌转速对活性炭吸附色素过程的影响。结果表明活性炭对色素的吸附是以物理吸附为主的吸热过程,其吸附热为12.54 kJ?mol?1,适宜的脱色温度有利于提高活性炭的利用效率,热水解吸可实现活性炭的再生;活性炭对色素的初始吸附速度随搅拌转速增加而增加;在活性炭快速吸附阶段,液膜扩散为主要控速步骤,增加搅拌转速可减少颗粒液膜层的厚度,有效扩散系数随之增加。通过考察进料对活性炭层析柱的脱色效果的影响,结果表明合适的进料流速能提过活性炭的利用率。 相似文献
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以离子液体—水体系为反应介质,硼氢化钾为还原剂,二芳基甲酮还原合成了二芳基甲醇。考察了不同离子液体对反应的影响及离子液体循环使用性能。还研究了不同取代基的二芳基甲酮的还原反应过程。反应在室温下进行、时间短、收率高、后处理简单,且疏水性离子液体可以方便地回收和多次循环使用,对反应的效果无明显降低,对环境友好。 相似文献
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Reclamation of textile dyeing wastewater for process use via a highly efficient integration system 总被引:1,自引:0,他引:1
In this study the secondary effluent after ODOBEZ system processing from a textile dyeing factory was recycledand reused in a dyeing bath. A pilot-scale combined system of a bio-activated carbon reactor (BAC) and membrane separation module (MS) was constructed and studied in detail. Through the efficacies of adsorption as well as biodegradation in BAC, the quality of secondary effluent can be improved further, and then it can be reclaimed and reused in a dyeing bath by using a membrane separation module to reduce the conductivity of the wastewater. This integrated system not only can decrease the frequencies of back washing and replacement of activated carbon via special bio-augmentation, but also alleviate the damage and fouling of membrane due to the further reductions in chemical oxygen demand (COD), suspended solids and color of influent after BAC; this lengthens the lifetime of membranes. In addition to the recycle and reuse fraction of the secondary wastewater in a dyeing bath, the final concentrated retentate after processing in this integrated system meets the stipulated regulations and can be discharged directly with no additional treatments. Once the COD of secondary inflow falls in the range of 100-200 mg/L, the COD of outflow after BAC can be reduced to the range of 50-80 mg/L with a hydraulic residence time of 4 h. In this situation the percentage of water reclamation can reach above 50%, and the final concentrated retentate can be discharged directly. The results of the dyeing tests by using recycling water showed that color deviation indexes, ΔE, were always less than 0.5, which was the criterion for laboratory-scale dyeing tests. After almost a year of operation, a detailed economics assessment was made, and it was found that a total cost 9.14 $NTD was enough to reclaim per cubic meter textile wastewater to a dyeing bath, which included costs in membrane replacement, activated carbon replacement, reagents for membrane washing and power consumption. 相似文献
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退役动力电池的梯次利用不仅可降低电池的使用成本,还可缓解回收退役电池的环境污染压力。为了定量确定动力电池退役点,本文提出了一种基于生命周期分析(LCA)定量分析方法。将动力电池梯次利用的生命周期划分为生产、作动力电池、重组、作储能电池和回收利用5个阶段,将电池的容量衰退与生命周期分析模型结合,在不同的二次应用场景下分析了电池的碳排放量随动力电池退役时的健康状态(SOH)变化情况,研究了退役点选择对电池寿命和环境的影响。研究表明,动力电池在SOH为85%~90%时退役可达到较小的碳排放量。在固定二次应用场景下,电池操作的放电深度(DOD)越小,则电池寿命越长,且碳排放量变化很小。研究为动力电池退役点的确定提供了定量分析方法,可为动力电池梯次利用提供指导。 相似文献
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研究了从碱减量废水中回收对苯二甲酸,并再用于聚酯涂膜的制备,有效解决了碱减量废水综合治理问题,并提高了回收产品的再用价值. 相似文献
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Dendrimers or Nanoparticles as Supports for the Design of Efficient and Recoverable Organocatalysts?
Michel Keller Arnaud Perrier Roland Linhardt Laurie Travers Sebastian Wittmann Anne‐Marie Caminade Jean‐Pierre Majoral Oliver Reiser Armelle Ouali 《Advanced Synthesis \u0026amp; Catalysis》2013,355(9):1748-1754
The Jørgensen–Hayashi catalyst [(S)‐α,α‐diphenylprolinol trimethylsilyl ether] was grafted onto the surface of two different supports: phosphorus dendrimers (generations 1 to 3) and magnetic, polymer‐coated cobalt/carbon (Co/C) nanobeads. These new supported catalysts displayed high activities and selectivities in the Michael additions of a wide range of aldehydes to different nitroolefins. Moreover, the dendrimer of the third generation displayed excellent recycling abilities since it could be recovered and reused in 7 consecutive runs without loss of activity. 相似文献
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