Fenton法再生废活性炭

运用Fenton法对甘氨酸母液脱色后的废活性炭进行氧化再生。实验结果表明:废活性炭再生的最佳工艺条件为:Fenton体系中H2O2/Fe2+的摩尔比为24∶1,H2O2的浓度为22.50 mmol/L,再生温度为60℃,反应时间为20 min,适宜pH值为3,再生之后的活性炭吸附能力可恢复75.5%以上。     

甘氨酸母液脱色后废活性炭的再生技术概述

在甘氨酸的工业生产过程中,为精制甘氨酸,改善甘氨酸产品的外观品质,需用吸附能力很强的活性炭对甘氨酸母液进行脱色处理,经脱色处理后,活性炭吸附饱和后成了废活性炭。废活性炭中含有大量成分复杂的有机物,属于危险固体废弃物,若不及时处理废活性炭,既浪费资源,又损坏环境。为降低生产成本,增加经济效益,减少固废产生,需对废活性炭进行再生利用。介绍了甘氨酸母液脱色废活性炭再生的几种方法。     

吸附重金属离子活性炭再生工艺研究

为评价吸附后活性炭再生效果,对吸附重金属离子活性炭的再生工艺进行了研究。考察了各因素对再生活性炭性能的影响。结果表明:升高再生温度及延长再生时间,活性炭质量损耗率随之上升,活性炭性能恢复率随之增加。增加再生次数,活性炭质量损耗率随之上升,活性炭性能恢复率随之降低。     

活性炭的再生

一、再生方法概述1.概述我们知道,活性炭在使用过程中渐渐达到吸附平衡,最后失去吸附能力,这时吸附操作就需更换新的活性炭.随着活性炭用量的不断增加,其消耗量迅速增大.因此,为了满足各行各业对活性炭日益增长的需求,除积极开发新的原料来源,大量生产廉价的活性炭以外,如何将用过的废活性炭再生,恢复其吸附能力而重复使用,也是活性炭工业开源节流的重要途径.所谓再生,即是使失去吸附能力的废活性炭恢复原来的特性,以供在吸附工艺中重新     

微波技术再生中水回用废旧活性炭研究

采用微波辅助溶剂技术,对一汽中水回用工艺中吸附饱和的粒状活性炭进行了再生实验研究.通过实验,探讨了活性炭的再生效率与活性炭量、微波功率、辐射时间、辅助溶剂的浓度及pH等因素的关系,并对各因素进行分析,得出微波法再生活性炭的最佳条件,活性炭再生率接近100%.     

磷酸三丁酯脱色活性炭热解再生研究

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。     

活性炭吸附法处理乙烯废碱液的研究

以活性炭为吸附剂处理乙烯废碱液,通过单因素实验,考查了吸附时间、吸附温度、活性炭粒度、活性炭投加量、废碱液pH对硫去除率的影响。吸附法处理乙烯废碱液的最佳工艺条件:吸附时间50 min、吸附温度25℃、活性炭粒度20~40目、活性炭投加量1.8 g、乙烯废碱液pH为3。在此条件下可使20 mL乙烯废碱液中硫浓度由1113.25 mg/L降到1.98 mg/L,硫去除率达99.82%,COD浓度由800000 mg/L降到5600 mg/L,COD去除率达99.9%。     

废活性炭微波加热法再生研究进展

论述了微波加热技术的特点,初步探讨了微波加热再生废活性炭的原理,综述了国内外微波再生废活性炭的研究进展。与传统加热技术相比较,微波加热再生废活性炭具有耗时短、产品质量好、能耗低、污染少等优点,并且微波加热再生废活性炭产品有更发达的孔隙结构,吸附性能较好。影响微波再生废活性炭的因素依次是微波功率、加热时间、活性炭吸附量。展望了微波加热再生废活性炭的发展方向。     

水蒸气活化再生乙酸乙烯合成触媒载体活性炭

探讨了活化温度、活化时间、水蒸气流量对再生后活性炭吸附性能和得率的影响,得到了最佳工艺条件:活化温度1 000℃,活化时间60 min,水蒸气流量2.23 g/min。该工艺条件下再生活性炭的碘吸附值1 174.37 mg/g,亚甲基蓝吸附值200 mL/g,得率为62.87%。再生后活性炭的吸附指标达到国家一级品的标准,其中亚甲基蓝吸附值是国家一级品标准的2.22倍。同时,测定了该活性炭氮吸附,通过BET计算了活性炭的比表面积,通过密度函数理论(DFT)表征了活性炭的孔结构。结果表明:该活性炭为微孔型,BET比表面积为1 254.51 m2/g,总孔容为0.592 6 mL/g。     

水热氧化法再生粉末活性炭的研究

以某山梨酸生产工艺中吸附饱和的废弃粉末活性炭为研究对象,采用水热氧化法进行再生处理,考察了初始氧分压、再生温度、炭浆浓度等因素对粉末活性炭再生效果的影响,并研究了再生废液及冷凝液的生化降解效果。结果表明,在初始氧分压为0.25 MPa、再生温度为270℃、炭浆浓度为9%的条件下,粉末活性炭的再生效果最佳,碘吸附值为1 035 mg·g^-1,亚甲基蓝吸附值为17 mL·(0.1 mL)^-1,炭损失率为13.89%;水热氧化反应后,再生废液及冷凝液的生化降解效果明显。与传统活性炭再生工艺相比,该工艺具有再生效果好、反应时间短、无二次污染等优点。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。