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鉴于新型锌合金的硅含量,可高于常见锌合金的10倍,在用光度法测硅前,对单硅酸的聚合性问题,进行了理论分析,并作了试验验证。结果表明,新型锌合金在测定条件下,单硅酸不聚合,所配制的一系列测硅检量液可隔夜使用,这既保证了测硅的准确度,又简化了操作,提高了分析速度,节约了药品。 相似文献
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氨液浸出催化氧化制备硫酸铜晶体的方法探讨 总被引:1,自引:1,他引:1
探讨了氨液浸出催化氧化制备硫酸铜的方法,并从热力学,动力学等角度进行了分析,对其反应可能性进行了论证,从多方面对反应机理进行了探讨。同时,将氨液浸出法与高温焙烧法作了对比,对其工业生产可能性作了分析,在多次实验的基础上,得出了较为合理的工艺条件。 相似文献
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2008年,即便国际金融危机席卷全球,中国经济依然快速发展,高歌猛进。但在经济快速发展的背后,却萌生了一系列问题:喝杯牛奶中毒了,睡个午觉楼倒了,坐趟高铁追尾了,买个家具甲醛超标了……一系列的安全事故,加深了人们对生活环境的担忧。 相似文献
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介绍了机械密封技术的基本原理,概述了机械密封技术的特色和优点,同时指出了其存在的一些不足。该技术在生产装置上应用后,避免了有毒、有害、高温易燃等介质外漏,减少或消除了安全隐患,降低了故障率,证明该技术成熟可行,能带来可观的经济效益,值得推广。 相似文献
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针对纯碱包装过程中,碱尘颗粒小,易飞扬,易吸潮,结疤等特点。布袋除尘器运行周期短,故障率高,包装环境恶劣的实际情况,本文提出了一些改造办法,稳定了除尘器的运行,改善了工作环境。 相似文献
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纪金海 《中国石油和化工标准与质量》2014,(14)
为了满足日益严格的安全环保要求,寻求更加经济高效的脱硫工艺,在塔河油田四号联合站设计时,进一步优化了稠油脱硫工艺。结合油田特性,反复论证,创新应用了“双塔合一”负压气提稳定脱硫工艺,经过近一年生产运行,效果显著,脱硫率>85%。该工艺进一步提高了H2S的脱除率,减少了气提气用量,同时降低了原油饱和蒸汽压,增加了轻烃产量,更能适应稠油处理、储运外销的需要,填补了国内稠油负压气提稳定脱硫技术应用的空缺。 相似文献
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O. I. Romanko V. N. Smirnova I. N. Andreeva Z. S. Khanin A. A. Almaev A. T. Kalashnik A. V. Volokhina 《Fibre Chemistry》1987,18(3):187-189
Conclusions Studies of starting solutions of PPTA in sulfuric acid and of granules obtained under pressrue at low temperature, and of granules stored in a hermetic package, have been carried out by the methods of differential thermal analysis, turbidity spectrum and viscometry.On granulation of a solidified PPTA solution, short-term storage of the granules in a hermetic package, or short contanct of the granulated mass with air, no appreciable change in melting point or of the intrinsic viscosity of the system takes place.Long storage of a granulated solution, even in hermetic packages, can lead to a considerable decrease in the melting point of the crystal solvates, caused by an increase in defectiveness of crystal structure under the effect of moisture.Translated from Khimicheskie Volokna, No. 3, pp. 25–26, May–June, 1986. 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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Based on the filtration equations with account of heat transfer in the heating region, the problem of instability of small
perturbations of the wave front of filtration combustion of a gas is solved. Expressions for the growth decrement and critical
transverse size of a perturbation are obtained. The problem of the wave-front stability is solved with account of the macroscopic
redistribution of filtration in the system. The solution includes macroscopic characteristics such as the transverse size,
the width of the high-temperature zone, etc. A method is proposed for taking into account the influence of the characteristics
of the system on the evolution of perturbations. It is shown that small deformation perturbations of the front always increase
to a certain amplitude; their subsequent development— continuation of their growth or stabilization—is determined by the characteristics
of the system.
Translated fromFizika Goreniya i Vzryva, Vol. 35, No. 5, pp. 3–5, September–October 1999. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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Process schemes for implementation of the optimum conditions of the final stage of orientational drawing of PP fibre are proposed based on the results of mathematical modeling. The existence of successive stages of transformation of the structure of PP fibre in the second stage of orientational drawing was experimentally confirmed with indirect indexes. The necessity of selecting the draw ratio that ensures completeness of the given stage of structural transformation is demonstrated. Structural schemes are proposed for automated control systems for selecting the optimum draw ratio in the first and final stages of orientational drawing and control of the structure of the spun polymer with indirect parameters. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献