压力容器用封头制造质量控制和专业化生产发展方向

中国法规首次对压力容器等特种设备用封头实施制造资格许可和强制的监督检验制度。本文根据法规标准的规定,对压力容器封头制造质量控制和专业化生产发展方向的要求作一系统的综述,以提高压力容器产品的整体质量,确保特种设备安全万无一失。     

氧化铁对硫铝酸钙矿物形成的影响

借助化学分析方法、X射线衍射、差示扫描量热法等测试手段研究了Fe2O3对无水硫铝酸钙矿物(C4A3S)形成过程的影响.研究表明:掺杂Fe2O3可促进熟料中游离氧化钙(f-CaO)的吸收,增加液相量,改善C4A3-S矿物生料的易烧性;不掺杂Fe2O3的矿物生料,C4A3-S单矿物在850℃以下几乎不生成,在1 000℃开始大量生成,在1 300℃达到最高值;掺杂1?2O3的试样中C4A3S含量与不掺杂试样在同温度下达到最大值,但绝对含量有一定幅度的下降;掺杂3%及5?2O3的试样中C4A3S含量在1 350℃达到最大值,达到最大值的时间比原来延迟0.5h,并且绝对含量有较大幅度的下降;掺杂Fe2O3的试样在1 200℃至1400℃时,Fe3 和C4A3-S中的Al3 发生置换,使Fe3 固熔到C4A3-S中形成固熔体C4(A0.95F0.05)6O12(SO4).     

浅谈脱硫液中PDS质量浓度测定方法

提出了在以PDS催化剂作为单一的脱硫催化剂时,脱硫循环液中贫富液的PDS质量浓度的测定方法,可有效地指导在脱硫工序投加PDS的操作及生产运行,为确保出脱硫工序煤气中H2S含量稳定控制在20mg/L以内奠定了基础。     

二氧化氯消毒剂发生器的研制

对二氧化氯消毒剂的优点进行了阐述，介绍了化学法二氧化氯消毒剂发生器的工作原理、研制过程及推广使用价值。     

The linear viscoelastic properties of copolypropylene–clay nanocomposites

The linear viscoelastic properties of copolypropylene (cPP)–clay nanocomposites (cPPCNs) prepared by melt intercalating with different amounts of clay were extensively examined by rheological measurements. Meanwhile, the clay effects on the cPP confinements were first estimated by calculating the activation energy of different cPP moving units, including the whole molecular chain, the chain segment, and smaller unit such as chain link. The results showed that the stability of cPPCNs melts wrecked when the clay loading was above 5 wt %. An increase in clay loading of cPPCNs gave rise to a strong low frequency solid‐like response (G′ > G″). Unlike the matrix polymer, cPPCN5 (with 5 wt % clay) exhibited a relaxation plateau as relaxation time prolonged above 100 s, and displayed a maximal linear modulus. The variations of the activation energy of different cPP moving units revealed that the mobility of cPP molecular chains was restricted by clay layers, while these restrictions were not only related to the clay loadings but also largely depended on the clay dispersion status in the matrix. The motions of cPP chain segments were greatly limited at 3–5 wt % loading of clay, but drastically activated with the addition of 7 wt % clay due to the increasing stacks of clay layers within the matrix. However, it was found that the presence of clay had little effect on the mobility of small cPP moving units such as chain links. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1523–1529, 2006     

水性涂料分散剂PD的生产

本文介绍了水性涂料分散剂大分子萘磺酸甲醛缩合物的钠盐(PD)的生产工艺流程，并与国外同类产品的性能技术指标进行了对比，结果表明：该产品完全可以作为国外同类产品的替代品，具有较高的使用和推广价值。     

氧化锌对阿利特和硫铝酸钙的形成及共存温度范围的影响

借助差热分析、X射线衍射及化学分析等,研究了ZrO对含硫铝酸钙的硅酸盐水泥熟料中阿利特和硫铝酸钙矿物形成及共存温度范围的影响.结果表明:在生料中掺入1%(质量分数)ZnO,可降低阿利特的形成温度,并促进低温下硫铝酸钙矿物的形成;1 300℃时阿利特生成的质量分数达59.23%,较未掺ZnO样品提高14.76%;掺入ZnO后,扩大了硫铝酸钙与阿利特矿物的共存温度范围,达50℃.     

Competitive Reaction During Decomposition of Hexachlorobenzene Over Ultrafine Ca–Fe Composite Oxide Catalyst

The decomposition of hexachlorobenzene (HCB) has been investigated over ultrafine Ca–Fe composite oxide catalyst (Ca/Fe atomic ratio was 3.4), CaO and α-Fe₂O₃ by using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Adsorption experiments on the surface of oxides monitored by in situ DRIFTS showed that partial oxidation products, i.e., phenolate and acetate species were formed on the surface of Ca–Fe composite oxide. The further studies indicated that Ca–Fe composite oxide catalyst was easier to induce the rupture of C–Cl bond and C–C bond of aromatic rings. The best catalytic activity of Ca–Fe composite oxide may be related to the acidity, which was determined by NH₃–TPD. The products after reaction have been analyzed by XRD and chloride selective electrode. Ca–Fe composite oxide exhibited the highest extent of mineralization for organic chlorine among the different oxides tested. The combined results of current and previous experiments demonstrated that two competitive reactions took place during the decomposition process of HCB: (1) hydrodechlorination resulting in the formation of lower chlorinated benzenes and (2) oxidation of aromatic rings leading to the rupture of aromaticity and the formation of oxidation products. The latter is the major process in the coexisted competitive reaction. A possible decomposition pathway was discussed.     

年产200吨4，4’-二氟二苯甲酮（DFBP）的工业化设计及可行性研究

本文在大量实验数据基础上，对4，4’-二氟二苯甲酮(DFBP)进行了年产200吨规模的工业化设计，从技术关键、工艺流程、设备选材、三废治理及成本核算等方面对DFBP工业化设计的可行性进行了评价，该设计有如下特点：工艺简单、合理，操作稳定、安全，三废治理有效，原材料及设备投资少，见效快，适合工业化大生产。     

取代2-四氢萘酮的一步合成新方法研究

本文介绍了一步法制备取代2-四氢萘酮的新方法,与常规合成方法相比,该法具有明显的优点:不需要先将羧酸转化成酰氯,避免了三氯化铝以及含氯溶剂的应用,并使催化剂得以循环利用。因此,该方法安全、环保,有望取代常规的付-克反应在工业上的应用。