电厂蒸汽凝结物中痕量甲酸根、乙酸根和氯离子的离子色谱测定

本文讨论了电厂蒸汽凝结物中痕量甲酸根、乙酸根和氯离子的离子色谱测定方法。采用Dionex 4000i型离子色谱仪、Dionex HPIC AS4分离柱和AMMS阴离子微膜抑制器,实现了上述三种痕量有机及无机阴离子的分离和高灵敏度抑制电导定量检测。淋洗液为1.5mmol/L硼砂溶液,抑制器再生液为25mmol/L硫酸溶液。在300μL进样量和1.0μS检测量程条件下,甲酸根、乙酸根和氯离子的检测限分别为5、7、4mg/ml,相对标准偏差均小于10％,峰高与待测离子浓度的线性关系良好。本方法可直接进样分析电厂蒸汽凝结物中的痕量甲酸根、乙酸根和氯离子。     

锰系中温黑色抗蚀磷化生产实践

锰系中温黑色抗蚀磷化工艺对传统的锰系磷化工艺进行了改进。介绍了磷化溶液的配制、各成分作用、管理维护及磷化后处理与磷化膜性能检测。该工艺降低了磷化温度，提高了生产效率，能获得良好的磷化膜层。     

酒精蒸发系统孔蚀原因分析

一、概述 某厂酒精蒸发系统均由304不锈钢制造,按照图纸施工完毕后,采用深井水试压,试验压力为0．4MPa。蒸馏系统工艺过程为：木薯干经粉碎蒸煮糖化,加入干酵母发酵72h,由输入泵打入蒸馏塔进行酒精蒸馏,所添加的辅料有干酵母、糖化酶和液化酶。蒸汽温度为200℃,压力为0．6MPa。该设备在投入使用2个月,导气管就发生了多处泄漏,为了查明泄漏原因,厂家从蒸发系统上截取泄漏部位的试样进行失效分析。送检分析失效试样为从蒸馏塔顶部所截取的导气管,宏观形貌如图1所示,图中长箭头所示为泄漏点。泄漏在导气管的母材部位与焊缝部位均有发生。根据蚀孔的形态和特征,可判定蚀孔起源于导气管的内表面。     

汽车涂覆高效磷化工艺的实验研究

通过新开发的高效磷化工艺对汽车板材和型材进行了实验研究，结果表明该工艺效率高、配套性好、磷化膜质优。应用ＳＥＭ验证了经过表调工艺的磷化膜晶粒致密均匀。耐蚀实验表明经过表调工艺的磷化膜耐蚀性优于未表调的磷化膜。研究指出汽车涂装磷化中表调工艺不宜省去。     

增加导气管硬度的配方设计

表2促进剂和补强剂对硫化胶物性影响表1补强剂品种对硫化胶物性影响唐山市化学厂生产的导气管也称蛇型管,是夹布胶管经定型硫化成波纹管,两端装有金属螺丝接头,以便分别与橡胶面罩和滤毒罐相连接。基于导气管在使用过程中,应具有较强的伸缩性和抗压性,即使弯曲受压(如弯曲180°)亦能保持气流畅通。为了更好满足导气管的这种要求,在橡胶配方中加入补强效果好的填充剂,调整促进剂的品种和用量,以增加导气管的硬度,由原来的(邵尔A)45增加到(邵尔A)60,且其它物理性能指标不受影响,符合产品要求。一、实验1.试验配方①在原配方基础上,调整补强填…     

膜法有机蒸汽回收技术在丙烯单体回收中的应用

阐述了膜法有机蒸汽回收的基本原理，介绍了压缩冷凝膜系统相耦合的工艺在回收尾气中丙烯单体的应用。有机蒸汽膜分离系统可以从不凝气中回收90％以上丙烯，通过比较膜系统加入后和去年同期丙烯的回收量，证明了膜系统的有效性。膜系统操作简单，占地少，没有二次污染。     

鲁奇炉入炉蒸汽导压管的一次技改

汽提蒸汽作为汽化剂的一种,因其所含杂质较多,经常会堵塞与其相连的导压管,最终导致蒸汽流量显示出现偏差,进而影响气化工况,严重时造成停车事故。本文介绍了针对这种现象的一次导压管技改,为气化炉的安全稳定运行创造了条件。     

酸洗对中低温锌系磷化膜质量的影响

出于成本的考虑,酸洗在涂装行业中被广泛应用,但是经过酸洗的工件可使磷化程度降低,尤其对于致密性好的薄膜磷化.本文采用扫描电镜观察磷化膜的结晶形貌,讨论了不同的酸洗工艺对普锌磷化和低锌磷化膜质量的影响.实验表明,对于普锌磷化,酸洗后的钢板能磷化成膜,但膜的致密性变差;而低锌磷化则难以成膜.采用适当的表调工艺,可以改善其成膜性及磷化膜质量.     

磷化与涂装工艺技术简述

简述了影响磷化膜质量的三要素，并对磷化与涂装工艺中磷化膜的致密度、表面沉淀物、膜厚、干燥、制剂的配套性及涂装工艺等技术进行了探讨。     

全膜法水处理技术在电厂中的应用

电厂生产过程中,锅炉补给水水质稳定合格对机组的安全高效运行十分重要.介绍了全膜法水处理技术在某电厂锅炉补给水处理系统中应用,详细讨论了全膜法水处理工艺特点、系统运行方式、控制参数和注意事项.运行结果表明:全膜法水处理工艺出水电导率＜0.10 μ S/cm,硅质量浓度＜5 μg/L,完全能满足电厂锅炉补给水水质的要求.     

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.     

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.     

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。     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.