共查询到19条相似文献,搜索用时 125 毫秒
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1 概述 用间接法生产浓硝酸,现大都采用硝酸镁法。1992年我厂自己设计、自己施工建成的年产5万吨浓硝装置就是采用硝酸镁法。自1993年年底该装置生产出合格的浓硝酸以来通过不断进行技术改造,完善工艺操作,各项工艺指标基本上达到了工艺要求,唯独稀硝酸镁中含HNO_3指标达不到设计要求。设计要求指标为<0.1%,而实际生产中有时高达1%以上,虽然此项指标 相似文献
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分析了硝酸镁法生产浓硝酸过程中稀硝酸镁含硝量高的危害性。通过采取加强对加热器的维护、优化硝酸镁沉降方法和改变硝酸镁投料方式等一系列优化改进措施,提升了浓硝酸装置连续运行能力,降低了装置综合能耗。 相似文献
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1概述我公司硝酸车间的硝酸镁加热器为U形管式换热器,卧式安装,共3台,壳体内径1500mm,换热面积171m^2,壳程介质为硝酸镁溶液,人口温度150℃,出口温度170℃,管程介质为饱和水蒸气,人口温度194.1℃,壳体及换热管材料均为00Cr19Ni10。该设备投入生产运行不久就发生内漏,而且锥形壳体也因腐蚀而泄漏,虽经多次补焊,但壳体腐蚀情况不但没有缓解, 相似文献
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Ring-opening polymerization of DL -lactide (LA) has been initiated with the (η3-C3H5)2Sm(μ2-Cl)2(μ3-Cl)2Mg(tmed)(η2-Cl)Mg(tmed) complex both in bulk and solution. The effects of reaction conditions, such as reaction time, reaction temperature, and monomer/initiator molar ratio on the polymerization has been discussed. The results showed that (η3-C3H5)2Sm(μ2-Cl)2(μ3-Cl)2Mg(tmed)(μ2-Cl)Mg(tmed) was more effective for the polymerization of LA, and high molecular weight of polylactide was obtained by this initiator. The solvent affected the polymerization significantly. The polymerization mechanism was in agreement with the coordination mechanism. The polymer was characterized by FTIR, 1H-NMR, and DSC. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2857–2862, 1999 相似文献
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Recently, NO3 (nitrate radical) was predicted to be formed during the decomposition of RDX. However, experimental studies of the gaseous products have never detected it. In order to verify the prediction, we studied the interactions of NO3 with RDX and four RDX decomposition intermediates (RDR, C3H5N5O4, OST, and TAZ) by using density functional theory (DFT). It is found that NO3 radical can be converted into NO2 during the process of interactions with the above‐mentioned five molecules. In other words, NO3 radical can be consumed in these processes, which gives an explanation for the disappearance of NO3. Transition state theory (TST) calculations lead to the same results. The binding energies are calculated to estimate the strength of interactions. The energy of NO3 with RDR is the largest, which indicates this process is most likely to occur. Our calculation provides a support to the prediction of the formation of NO3. 相似文献
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用8—羟基喹啉(oxine)制备Ba(Mg1/3Ta2/3)O3粉体 总被引:3,自引:0,他引:3
本文对用8-羟基喹啉(oxine)为螯合剂来制备Ba(Mg1/3Ta2/3)O3(BMT)粉料进行了研究。就oxine的加入量,pH值的改变对生成钽镁沉淀的产率及其粉料性能的影响进行了研究比较,结果表明,当oxine的加入量大于MgTa2O6摩尔数的3倍,pH值保持在10左右时制得的钽镁粉较为理想,其比表面积达32m^2/g,与BaCO3混合后烧结温度比用传统制备法降低180~250℃。 相似文献
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采用熔融共混法,制备了聚乙烯醇(PVA)/聚乙二醇(PEG)/氢氧化镁[Mg(OH)2]复合材料,利用转矩流变仪考察了复合材料的熔融加工性能;利用差示扫描量热仪(DSC)、热重分析仪(TG)考察了复合材料的热性能;采用注塑成型工艺制备了复合材料标准样条,利用万能电子拉力机、扫描电子显微镜(SEM)等对复合材料力学性能及微观形貌进行了测试分析。结果表明:当复合材料体系配比为PVA/PEG/Mg(OH)2为100/20/8(质量比)时,复合材料能形成良好的复合体系,具有良好的热塑加工性能及力学性能(拉伸强度为33.42MPa,断裂伸长率为224.3%)。 相似文献
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考察了不同种类的活性炭载体对CuCl2-La(NO3)3/AC吸附剂吸附乙烯性能的影响。通过XRD表征表明,CuCl在4种活性炭上均呈高度分散状态。对吸附剂的比表面、总孔容、微孔孔容和平均孔径测试结果表明,活性炭的平均孔径和微孔孔容大小决定乙烯的吸附量和乙烯/乙烷分离因数大小。活性炭的平均孔径越小,微孔孔容越大,对乙烯的吸附量越大,乙烯,乙烷分离因数越大。以上海椰壳炭为载体的吸附剂因为具有最小的平均孔径和最大的微孔孔容,因此,对乙烯的吸附效果最好。 相似文献