快速测定盐水中过碱量的分析方法

利用溴甲酚绿和甲基红的混合指示剂,采用一步法快速的检测盐水中的过碱量,避免了使用甲基橙终点由黄色变为橙色终点难以准确判断的弊端.     

超级13Cr钢管坯异常显微组织的一种金相显示方法

在对超级13Cr钢管坯进行检验时,发现某批次管坯的显微组织存在异常,采用常规侵蚀剂无法清晰地显示其显微组织形貌。通过使用多种侵蚀剂交替侵蚀分析发现：采用王水酒精溶液、苦味酸盐酸酒精溶液和赤血盐氢氧化钾水溶液三种侵蚀剂交替侵蚀可以清晰地显示该批次超级13Cr钢管坯的显微组织;其中王水酒精溶液和苦味酸酒精溶液的侵蚀效果相似,都能很好地显示出该钢中的马氏体和块状铁素体组织,但不能很好地显示出该钢中的贝氏体组织,也不能确定出该钢中沿热加工方向的条状组织;而赤血盐氢氧化钾水溶液则能显示出该钢中除马氏体以外的其他组织,并且证实沿热加工方向的条状组织为δ-铁素体。     

井矿盐生产节能减排浅析

文章依据井矿盐生产的实际情况,从工艺、设备、操作、管理4个方面分析了井矿盐生产节能减排的具体措施和办法。     

Nitration of phenol over silica supported H4PW11VO40 catalyst

Vanadium incorporated tungstophosphoric acid (TPAV₁) supported on silica was synthesized and characterized by BET-surface area, Fourier transform infrared spectroscopy, X-ray diffraction and Laser Raman techniques. Nitration of phenol was studied at room temperature (25 °C) using HNO₃ in the presence of 0–20 wt.% TPAV₁/SiO₂ catalysts taking 1, 2-dichloroethane as solvent. The effects of various parameters such as phenol/HNO₃ mole ratio, reaction time, catalyst weight, and stirring speed on the catalyst activity were studied. 8 wt.% TPAV₁/SiO₂ has shown the best activity, regioselectivity and reusability in the nitration of phenol, with a conversion of 92.6% and o-nitrophenol selectivity of 97.9%.     

色谱分析在避免电力设备事故中的应用

介绍了通过开展有效的色谱异常检测避免一起110 kV主变压器事故发生的成功案例,表明绝缘油色谱例行检测可以有效分析判断设备内部绝缘状态,这一测试手段对于避免电力设备事故具有重要意义。     

盐穴地下储气库风险评估方法及应用研究

随着我国地下储气库的建设投入逐步加大，如何有效防止地下储气库事故发生，在增强其运行安全性的同时合理利用资源，以获取最大经济效益，已成为储气库管理者重点关注的问题。为此，以盐穴地下储气库作为研究对象，将其划分为地下储气设施、地面站场设施和地面集输管线3个评价单元，采用系统分析和事故分析的综合分析方法，将该类储气库风险因素归类为腐蚀、冲蚀、水合物生成、设备失效、操作相关、机械损伤、地质构造因素以及自然力8类共性风险，包括14大类和45小类风险因素；研究建立了盐穴地下储气库风险评估方法，包括基于故障树技术的地下储气设施风险评估方法、地面站场设施的定量风险评估方法和地面集输管线的肯特管道风险评分法；并将建立的盐穴地下储气库风险评估方法应用于某盐穴地下储气库的风险评估，为盐穴地下储气库安全管理提供了依据，同时可为枯竭油气藏型和含水层型储气库的安全管理提供参考。     

Preparation and adsorption properties of chelating resins from thiosemicarbazide and formaldehyde

A novel chelating resin was synthesized in just one step under mild synthetic conditions. The synthesis was carried out through the copolymerization of thiosemicarbazide and formaldehyde in an aqueous solution. The adsorption properties for some noble metal ions were investigated. The results showed that the resin had high adsorption selectivity for Au(III) and Ag(I). The adsorption capacities for the two metal ions reached up to 7.3 and 11.8 mmol/g, respectively. The adsorption rate for the two metal ions in a dilute solution was 99.9%. The adsorption fit first‐order kinetics, and an isothermal adsorption study indicated that it corresponded to Langmuir monomolecular layer adsorption. The change in the bonding energy during the chelating process was investigated with X‐ray photoelectron spectroscopy. The study revealed that nitrogen and sulfur atoms of the resins were electron donors and metal ions were electron acceptors in the process. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Scouring-ball effect of microsized silica particles on operation stability of the membrane reactor for acetone ammoximation over TS-1

A ceramic membrane reactor system was developed for the continuous ammoximation of acetone to acetone oxime over titanium silicalites-1 (TS-1) catalysts. The effects of catalyst concentration and microsized silica particles on the performances of the membrane reactor system were examined in detail. For the membrane reactor system the optimal catalyst concentration is 17.0 g L^?1, obviously higher than the one obtained from the previous experiments in a batch glass reactor, because the strong adhesion of TS-1 catalyst particles on the surface of the pipeline, the tank and the membrane leads to the decrease of effective catalyst concentration. Adding the microsized silica particles can effectively inhibit the decrease of TS-1 catalysts concentration in reaction slurry and improve the operation stability of the membrane reactor system significantly, benefiting from the scouring effect and the attachment of TS-1 particles on the surfaces of larger silica particles. According to the estimation of hydrodynamic forces acting on particles, microsized silica particles are hard to deposit on the contact surfaces at the studied conditions and therefore a longer stable operation of the membrane reactor system has been achieved.     

相变储能微胶囊研究进展

系统综述了微胶囊相变材料的制备方法、性能改进及其应用领域,突出阐述了微胶囊复合相变材料的研究进展,最后对微胶囊相变材料的发展前景进行了展望.     

尿素-溴化钙联用分离制高纯度间甲酚

以物质的量之比为66.8∶33.2的间甲酚和对甲酚的混酚为原料,采用尿素络合法分离间甲酚.以与间甲酚等物质的量的甲苯为溶剂,在尿素与间甲酚物质的量之比为1.4的条件下分离后,间甲酚回收率为65％,纯度为99％.采用溴化钙络合法对尿素法分离间甲酚所产生的废液进行再次分离,得到混酚原料,然后采用尿素法进一步分离,间甲酚的回...