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脱水天然气输送管道腐蚀失效分析 王秦晋1,郑家燊2,李国敏2,刘烈炜2,韩旭1 (1.四川石油设计院 成都 610017;2.华中科技大学化学系 武汉 430074) 摘要:川东油气田天然气集输管道多次出现管道破裂穿孔等事故.利用X衍射,扫描电镜,电子探针,热重分析等方法对现场的腐蚀挂片和集输管道中收集的腐蚀产物进行了分析检测.结果表明:集输管道虽然经过三甘醇脱水工艺处理,仍遭受较严重的H2S腐蚀,腐蚀形态主要为局部坑蚀;集输管道中形成的腐蚀产物成分比较复杂,主要为FeS,FeS2,Fe3S4和Fe9S8,同时存在一定量的铁的氧化物和其它化合物;管道中腐蚀产物的热分析表明,在170℃~350℃温度区间,存在一个强放热反应,热焓值△H为-256.8 J/g,该反应可能为FemSn转化为FexOy反应. 关键词:脱水腐蚀产物X-衍射扫描电镜电子探针热重分析; dehydration......
of hemihydrated gypsum. Key words: water-saturated flourgypsum; dehydration; hemihydrated gypsum; calcination; activation 氟石膏主要来自于萤石粉和硫酸生产氢氟酸时所产生的废渣.我国每年排放出的氟石膏约300万t[1].直接排放出的湿氟石膏中常含有未反应的CaF2和H2SO4,通常采用石灰或电石渣对......
锶铁氧体胶态振动注模成形技术研究 郝俊杰1,石棋2,邵慧萍1,郭志猛1 (1.北京科技大学,北京,100083;2.景德镇陶瓷学院,江西,景德镇,333001) 摘要:通过絮凝,振动脱水工艺处理,获得固相体积分数达50%的锶铁氧体浆料,实现了高质量锶铁氧体坯体的胶态振动注模成形.分析了工艺条件对成形过程及样品质量的影响.实验表明:胶态注模成形比凝胶注模成形需要加入更多的单体与交联剂才能得到坯体强度相当的坯体;烧成后的锶铁氧体的剩余磁感应强度为420 mT,矫顽力H_(cb)为270 kA/m,最大磁能积(BH)_(max)为34 kJ/m~3. 关键词:胶态振动注模; 锶铁氧体; 单体; 脱水; colloid vibrant casting; strontium ferrites; monomer; dehydration; [全文内容正在添加中] ......
number of rare earth elements.The activation ener-gies for dehydration and decomposition reaction of rare earth acetate hydrates have been calculated byFreeman-Carroll and Kissinger method.The dependence of activation energy Jor dehydration reaction on theatomic number of rare earth elements shows"inclined‘W’effect".The enthalpy changes for dehydration anddecomposition reaction have been......
method for preparation of anhydrous LaBr3 for scintillation crystal growth. High purity anhydrous LaBr3 powders in large quantities were successfully obtained by stepped dehydration of LaBr3·7H2O using NH4Br as addi-tive. Experiments revealed that adding proper amount of NH4Br could effectively restrain the hydrolysis of LaBr3 during dehydration and thus decreased the yield of deleterious impurity......
method for preparation of anhydrous LaBr3 for scintillation crystal growth. High purity anhydrous LaBr3 powders in large quantities were successfully obtained by stepped dehydration of LaBr3·7H2O using NH4Br as addi-tive. Experiments revealed that adding proper amount of NH4Br could effectively restrain the hydrolysis of LaBr3 during dehydration and thus decreased the yield of deleterious impurity......
to three crystallized water molecules, and dehydration will take place when heating the raw materials at about 230 ℃ for several hours.The oxidization of LaCl3 during dehydration and growth can......
程可分为3个阶段,第一阶段的控速环节是化学反应,预焙烧和未焙烧红土镍矿的活化能分别为90.21和63.12 kJ/mol;第二阶段和第三阶段控速环节是扩散,红土镍矿的活化能逐渐增大.关键词:红土镍矿;动力学;热分析;直接还原Dehydration mechanism and reduction process dynamics of laterite nickel oreZHANG... Publishing Centre, University of Science and Technology Beijing, B)Abstract:The dehydration mechanism and reduction process dynamics of laterite nickel ore were studied. The results indicate......
High Temperature Chemical Reaction of La2O3 in H3BO3-C System吴文远,徐璟玉,彭可武,涂赣峰摘 要:The high temperature chemical reaction process of La2O3 in H3BO3-C system was studied by means of XRD and TG-DTA.The results showed that dehydration reaction of H3BO3 occurred in the temperature range of 82390 ℃;La2O3 and B2O3 reacted to form LaB3O6,LaBO3,and B4C......
of La3+ and Ba2+ modified NaY zeolites were synthesized through different impregnation procedures. Lactic acid dehydration to acrylic acid was selected as a probe reaction to test the catalytic... to acrylic acid during lactic acid dehydration.关键词:......