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31.
32.
亚硫酸钙氧化为石膏的研究 总被引:6,自引:0,他引:6
进行了亚硫酸钙氧化为二水石膏的研究 ,考察了初始 p H值、反应温度、空塔气速、固含量和停留时间对氧化率的影响 ,给出了适宜的反应条件 .在这些条件下 ,氧化率达 96 %以上 相似文献
33.
郑国忠 《中国非金属矿工业导刊》1994,(4)
本文首先讨论GPS星座组成及美国的用政策,阐述了AS措施及其对GPS测量的影响。然后,对抗AS的若干方案进行介绍,分别对平方法、互相关法、码相关干法及P-W技术(Ashtech法)进行叙述和评论,指出它们的优缺点,评述它们在GPS技术发展过程所起的作用。最后,对GPS星座建成后的形势作了小结,并对当前我国GPS事业的有关问题提出四点建议。 相似文献
34.
天然气制液态烃新工艺 总被引:2,自引:0,他引:2
丰富的天然气资源,特别是边远地区分散的中小天然气田和油气共生的油气田的天然气,由于产量达不到管线长输的规模效益,又远离消费市场,很难开发利用.为此,作者在天然气两段催化氧化制合成气和费-托合成研究的基础上,提出了一种流程较短、投资和操作费用较低的天然气合成液态烃新工艺,可将丰富的天然气资源,特别适合将边远地区分散的中小天然气田的天然气转化为无硫、无氮、无芳烃、无重金属污染和便于输运的优质石蜡基液态产品.该产品可经轻度加氢改质得到高品质的柴油掺合组分、润滑油基础油高等附加值产品.该工艺副产的燃料气可用于发电,或作为燃料气使用. 相似文献
35.
The formation of a low Cr-volatility and electrically conductive oxide outer layer atop an inner chromia layer via thermal oxidation is highly desirable for preventing chromium evaporation from solid oxide fuel cell (SOFC) metallic interconnects at the SOFC operation temperatures. In this paper, a number of ferritic Fe–22Cr alloys with different levels of Mn and Ti as well as a Ni-based alloy Haynes 242 were cyclically oxidized in air at 800 °C for twenty 100-h cycles. No oxide scale spallation was observed during thermal cycling for any of these alloys. A mixed Mn2O3/TiO2 surface layer and/or a (Mn, Cr)3O4 spinel outer layer atop a Cr2O3 inner layer was formed for the Fe–22Cr series alloys, while an NiO outer layer with a Cr2O3 inner layer was developed for Haynes 242 after cyclic oxidation. For the Fe–22Cr series alloys, the effects of Mn and Ti contents as well as alloy purity on the oxidation resistance and scale area specific resistance were evaluated. The performance of the ferritic alloys was compared with that of Haynes 242. The mismatch in thermal expansion coefficient between the different layers in the oxide scale was identified as a potential concern for these otherwise promising alloys. 相似文献
36.
固载于SBA-15分子筛中的同双核金属配合物催化剂 总被引:3,自引:1,他引:2
合成了3种同双核金属配合物[M2LCl3]Cl(L代表配体三亚乙基四胺,M代表Co,Cu,Cr),采用微波加热法合成了SBA-15分子筛,采用浸渍法将3种同双核金属配合物分别固载在表面官能化的SBA-15分子筛(SBA-15-NH2分子筛)中制得负载型催化剂。傅里叶变换红外光谱、X射线衍射、紫外可见光谱和热分析表征结果表明,同双核金属配合物被固载后,其结构仍保持完整。以环己烷氧化反应为探针反应,考察了[Co2LCl3]Cl/SBA-15-NH2,[Cu2LCl3]Cl/SBA-15-NH2,[Cr2LCl3]Cl/SBA-15-NH2催化剂的活性,环己烷转化率分别为11.0%,49.5%,57.9%;对于[Cr2LCl3]Cl/SBA-15-NH2催化剂,当分别以乙睛、丙酮和冰醋酸为溶剂时,环己烷转化率分别为57.9%,52.1%,34.2%,3次重复实验的环己烷转化率分别为57.9%,47.8%,46.5%,表明该催化剂具有较好的活性和重复使用性。 相似文献
37.
Osasere Faraday F. Orumwense 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,60(4):405-411
Dispersion–flocculation studies on a Goethite–clay system using flocculants were carried out as a function of flocculant concentrations, pH of slurry, time of agitation and dispersant dosage. Also, the effects of pH and polymer concentrations on the adsorption behaviour of the system were investigated. Results show that well flocculated goethite was preferentially obtained from 4% goethite/kaolinite clay suspensions, with 50 ppm causticised starch in the slurry at pH values of 3–11·5 and with 50 ppm polyacrylamide at pH values of 3–8. Good flocs were also obtained on flocculation of the goethite suspension with 50 ppm polyacrylamide at pH values of 5–7, while the kaolinite suspension did not respond to the same dosage of causticised starch in the same pH range. Results further reveal that for the goethite/kaolinite suspension, the best results was obtained with 50 ppm polyacrylamide at pH values of 7–10. Based on the data generated in the study, it was concluded that causticised starch is a better flocculant than polyacrylamide for goethite suspensions although polyacrylamide is an excellent flocculant for kaolinite suspensions. 相似文献
38.
Girendra N. Kulsrestha Uma Shankar Jaipal S. Sharma Jasvinder Singh 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1991,50(1):57-65
Liquid-phase oxidation of cyclohexane with Co(III) catalyst and gaseous oxygen was found to be influenced by reaction temperature, catalyst concentration and the duration. Maximum adipic acid product selectivity (77%) with about 85% cyclohexane conversion was attained at 100°C using catalyst: cyclohexane molar ratio 0·08. Under these conditions more than 80% cyclohexane was converted in the first hour, although selectivity to adipic acid continued to increase for the next 5 h. Cyclohexyl acetate and cyclohexyl monoadipate were identified as important intermediates. This study supports the mechanism proposed by Schultz, J. G. D. and Opchenko, A., J. Org. Chem., 38 (21) (1973) 3729. 相似文献
39.
At high temperatures in clean oxidizing environments, SiC forms a very protective SiO2 film, but, in environments containing low levels of gaseous alkali salt contaminants or where condensed salts may deposit on the surface, the resistance of the film is significantly reduced. Oxidation kinetics of SiC were measured by continuous thermogravimetric analysis in a controlled environment containing CO2 , H2 O, and O2 plus low levels of potassium-containing salts. Potassium was found to be incorporated into the SiO2 scale and to significantly change its transport properties and its morphology. The rate of scale formation was found to increase directly in proportion to K in the scale. A change in mechanism was observed when water vapor was added to the reacting gas stream. 相似文献
40.
M.A.R. Alves 《Microelectronics Journal》2005,36(1):51-54
We developed a process to obtain sharper silicon tips by employing anisotropic etching in a KOH solution followed by SF6 plasma etch. The tips were further sharpened using the established thermal oxidation technique to decrease the cone angle and, therefore, obtain smaller curvature radii. We have analyzed the impact of such changes in geometry on a figure of merit associated with the field emission characteristics. An increase in the figure of merit by a factor of three was found in relation to the tips before sharpening. 相似文献