粉煤灰在造纸废水处理中的研究进展

本文主要对改性粉煤灰处理造纸废水的相关工艺参数作了详细的阐述,并对粉煤灰与其他处理工艺联用的情况作了综述,指出了粉煤灰处理造纸废水存在的问题,并提出未来粉煤灰处理造纸废水的可研方向.     

燃煤电厂脱硫废水零排放技术研究进展

燃煤发电会产生大量的含硫危害气体,烟气湿法脱硫工艺是燃煤电厂最常使用降低烟气污染的技术,脱硫效果显著,但湿法脱硫产生的废水会造成二次污染,须要进行特殊处理.从烟气脱硫废水的处理现状入手,简述了脱硫废水产生来源、水质特点及其危害,重点介绍了基于蒸发结晶技术和烟气余热干化技术的脱硫废水零排放工艺路线,分析了其核心技术原理及优缺点,比对了其应用效果,并从知识产权角度分析了零排放的技术主体,并展望了脱硫废水零排放技术的发展趋势.     

湿法烟气脱硫废水处理研究进展

湿法烟气脱硫工艺是现阶段世界范围内应用最广泛的脱硫工艺,该工艺不可避免地会产生一定量废水。介绍了脱硫废水的产生原因及危害,对脱硫废水处理工艺的研究现状和不足进行了阐述,并结合水质特点综述了脱硫废水中各污染物的处理方法。在此基础上对脱硫废水中氯离子、硫酸根、COD及硒的处理方法提出了展望。     

坑口电厂“三废”的综合治理

介绍了蒋庄煤矸石热电公司对废水、废渣、废气的综合治理及利用措施:废水经处理后可用作卫生冲水、洗煤水和井下防尘水等;锅炉燃烧后产生的灰、渣可用于生产粉煤灰砖、水泥或填充矿区塌陷区等;采用炉内喷钙脱硫工艺处理燃烧后的废气,流程简单,自动化程度高,脱硫率高。     

络合铁脱硫工艺在粘胶纤维废气H2S治理中的应用

介绍了络合铁脱硫技术的原理、工艺流程及工艺参数的控制要求.并应用于粘胶纤维生产中废气H2S的治理.对比分析络合铁脱硫工艺与氢氧化钠碱洗脱硫工艺脱除H2S的运行费用,结果表明:高浓度H2S和高潜硫量粘胶纤维废气采用络合铁脱硫工艺处理,运行成本和环保效益均具有优势.     

燃煤电厂脱硫废水零排放工艺研究

燃煤电厂在生产过程中会产生大量含SO2的烟气,一般情况下采用湿法脱硫来处理,湿法脱硫需从烟气脱硫系统中外排部分废水以保证FGD(Flue Gas Desulfurization)的安全性和可靠性。由于脱硫废水属于燃煤电厂的末端废水,具有高含盐量、高腐蚀性等特性,对其进行安全、稳定处理十分必要。介绍了脱硫废水的传统处理以及各种新兴的零排放工艺,重点阐述了蒸发结晶工艺实现脱硫废水零排放的原理和优点,介绍了多效和MVR蒸发结晶工艺在国内外零排放领域的应用现状,分析结果表明对于燃煤电厂产生的脱硫废水,预处理后进入MVR蒸发结晶系统是一种较优的处理方法。     

粉煤灰絮凝剂的制备及其在印染废水处理中的应用进展

本文介绍了印染废水的特征和印染废水处理技术现状,分析了粉煤灰絮凝剂的制备和絮凝沉降机理,阐述了粉煤灰絮凝剂处理印染废水的研究进展.比较不同粉煤灰絮凝剂处理印染废水的效果发现:利用阳离子有机改性剂制备的改性粉煤灰制备工艺简单,对印染废水的处理效果较好,能够回收利用,是理想的粉煤灰絮凝剂.     

粉煤灰及其改性在烟气脱硫方面的研究进展

根据粉煤灰的组成成分、物理性质和化学性质,综述了其改性的机理和方法,并介绍了其在烟气脱硫方面的一些主要应用。粉煤灰直接利用时其活性低,脱硫效果不理想,通过火法或者湿法对其改性处理后,能激发其潜藏在内部的活性,使脱硫率提高。利用粉煤灰制备出选择性好、吸附容量大、吸附效率高的SO2吸附剂,脱除燃煤废气SO2,以废制废,是未来发展的趋势。     

脱硫废水零排放深度处理工艺

针对脱硫废水零排放深度处理工艺的应用现状,进行科学合理的分析,并详细介绍研究脱硫废水零排放深度处理的工艺的重要性,提出蒸发结晶零排放技术、威立雅脱硫废水零排放技术、膜浓缩技术等脱硫废水零排放深度处理工艺原理与应用要点,希望能够给相关工作人员提供一定的帮助。     

燃煤电厂脱硫废水零排放处理技术与应用

燃煤电厂生产过程中产生的废气主要采用石灰石—石膏湿法脱硫技术处理,其废水具有含盐量高、腐蚀性强、硬度高等特点;介绍了脱硫废水的水质与排放标准,阐述了烟道蒸发和蒸发结晶技术两种常见零排放技术的原理和工艺流程,并总结了目前该技术在国内外的应用现状。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

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。     

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.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

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.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

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.     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

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.     

责任和责任心的涵义与结构

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.     

二甲基二烯丙基氯化铵和丙烯酰胺的合成及应用

用复合引发体系(过硫酸盐-偶氮类引发剂)和脂肪胺类氧化还原体系引发,在实验室获得了单体转化率≥98%,特性粘数高于13.6 dL/g的阳离子共聚物PDA,探讨了控制聚合物分子量的影响因素.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

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.