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磷酸生产中由于氟吸收系统存在氟吸收效率低,冷却水含氟量高,循环冷却水系统腐蚀严重以及副产氟硅酸浓度较低等问题。通过对氟吸收喷头、循环冷却水系统等进行改造,极大地减少了含氟气体外排带来的环境污染;同时在生产上减少了清理工作量,确保了生产的连续稳定。 相似文献
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磷酸生产中由于氟吸收系统存在氟吸收效率低,冷却水含氟量高,循环冷却水系统腐蚀严重以及副产氟硅酸浓度较低等问题。通过对氟吸收喷头、循环冷却水系统等进行改造,极大地减少了含氟气体外排带来的环境污染;同时在生产上减少了清理工作量,确保了生产的连续稳定。 相似文献
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针对湿法磷酸尾气中氟吸收效果差、氟资源浪费等问题,对磷酸尾气洗涤系统进行了改造。通过增设文丘里洗涤塔,增加管道洗涤和文丘里洗涤两次逆流洗涤,并将洗涤后的含氟污水作为磷酸浓缩系统氟硅酸生产补水,回收了尾气中的氟资源,并使尾气中的氟达到国家排放标准。 相似文献
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硫化机在硫化过程中产生的废蒸气,通过系统改造,回收利用,作为溴化锂吸收式制冷机的能源。这一改造节约了能源,减少了氟利昂对环境污染,同时稳定产品的生产质量,做到清洁生产。 相似文献
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本文介绍湿法磷酸深度脱氟制取饲钙的工艺技术状况,推荐用国外间歇脱氟工艺技术来改造国内湿法磷酸深度脱氟技术,以生产合格的饲钙。 相似文献
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磷化工生产过程中涉及磷酸、硫酸、氟等强腐蚀性介质,耐磨蚀离心泵的轴密封是整个泄漏控制工作的重点及难点。介绍了离心泵机械密封的原理,针对普通机械密封在实际生产应用中存在的问题,对HTM集装式机械密封进行了局部改造。改造后得到的WHS系列无水集装式机械密封投入运行后,改善了现场操作环境,降低了水资源消耗,延长了设备使用寿命,从而降低了生产成本。 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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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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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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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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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献