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介绍了BM2. 7电解槽结构特点。膜极距改造后,单元槽电压可下降250 m V以上;而阳极网背面重涂质量与槽电压降低幅度有很大关系,有的只下降50 m V。给出膜极距改造方案。改造后A槽单元槽电压下降267 m V,B槽单元槽电压下降244 m V,节电明显,社会经济效益显著。 相似文献
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分别由甲、乙两个公司将离子膜电解槽改造成膜极距槽。改造后,不同厂家改造的电解槽分别使用X、Y离子膜,对比运行数据,发现:X膜的膜阻较小,膜压降低;Y膜的膜阻较大,膜压降较高;甲公司改造的膜极距槽整体质量较高,其阳极涂层配方略差;乙公司改造的膜极距槽节电性能略差,但阳极涂层配方较好。 相似文献
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膜污染一直是影响膜生物反应器(MBR)工艺稳定运行的难题。试验研究了浮球填料的加入对好氧管式膜MBR工艺中膜污染的影响规律及机理。结果表明,生物载体的加入能够显著减缓膜污染。与没有生物载体的MBR相比,载体填充率达到40%时可使滤饼层阻力下降约60.7%,孔堵阻力下降约90.6%,单周期运行时间延长约83.3%。机理分析表明,载体型MBR中悬浮污泥粒度明显增大,不可逆膜污染主要组分溶解性胞外聚合物(EPS)含量显著减少,而且EPS中蛋白质相对比例增加,滤饼层与膜面间的结合程度减弱,可改善低压冲洗和化学清洗效果。 相似文献
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ML-32NCH电解槽运行5年后,单元槽平均电压上升至3.25 V,直流电耗上升至2 300 k W·h/t。膜极距改造后,单元槽电压下降250 m V,直流电耗下降178 k W·h/t,1.7年即可收回改造投资。 相似文献
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在离子膜电解槽进行膜极距改造的同时,分别使用了F-8080膜和另一公司的离子膜。对比改造后不同电解槽使用不同膜的电压曲线和氯气纯度,说明使用不同膜的氯气纯度和电流效率都相差不多,但是F-8080膜在电压上有较大的优势,节电效果明显。 相似文献
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阐述了对离子膜电解槽的改造内容和改造后电解槽的特点.规范了膜极距电槽的开、停车操作,考核了对膜极距电槽运行,提出了运行中的注意事项. 相似文献
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对离子膜电解槽膜极距改造的2种不同方式——停车改造和不停车改造进行了技术经济比较,确定了采取不停车改造的方式实施,可以保证改造期间烧碱产量不减少,从而获得较好的经济效益。 相似文献
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苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况,合成乙苯,苯乙烯所用的催化剂种类,并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。 相似文献
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Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile
Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, 13C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc. 相似文献
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The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu3Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu3Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters. 相似文献
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《国际聚合物材料杂志》2012,61(1-4):113-122
Abstract Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed. 相似文献
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G. R. Hamed 《The Journal of Adhesion》1983,16(1):31-39
A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength. 相似文献
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责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体. 相似文献
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Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method1 was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity. 相似文献