共查询到20条相似文献,搜索用时 625 毫秒
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糠醛抽出相精制后的焦化柴油,色度得到了很大的改善,储存6个月后色度小于1.5,总不溶物也大幅度降低,但分布不均匀。本文从所用原料、核醛含量、助剂等几方面对此原因进行了分析探讨,认为助剂是导致不溶物分布不均匀的主要因素,通过水洗方式可消除,同时精制油与常二线油进行了调合,混合均匀的精制油与常二线以70:30的比例调合后,完全满足轻柴油一级品的要求。 相似文献
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用溶剂萃取的方法对重油催化裂化柴油进行脱酸精制研究。首先用单一溶剂糠醛、N,N-二甲基甲酰胺、二甲基亚砜、甲醇、聚乙二醇进行脱酸效果对比并对溶剂进行筛选,然后考察了复合溶剂的脱酸效果,最终选定糠醛和N,N-二甲基甲酰胺为最佳复合溶剂。考察了复合溶剂配比、剂油比、萃取温度和萃取时间等因素对脱酸效果和精制油收率的影响,加入聚合氯化铝作为助剂可提高精制油收率。实验得到的最佳精制条件为:复合溶剂最优配比糠醛/N,N-二甲基甲酰胺为2 g/g、剂油比1 g/g、精制温度35℃、精制时间10 min、助剂加入量2.0%、静置时间15 min。结果表明,在最佳萃取条件下,得到产品酸度为4.2 mgKOH/100 mL符合普通柴油GB 252—2011的要求,且产品收率达到89.8%。复合溶剂萃取精制解决了柴油碱洗脱酸易乳化、单一溶剂萃取脱酸效果差的问题,同时大大降低了溶剂的使用量,并对复合溶剂进行回收利用,缩减了工艺成本。 相似文献
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《现代化工》2020,(4)
以高芳烃含量的劣质催化裂化柴油为原料进行加氢转化工艺研究,考察体系压力、裂化温度、精制深度以及操作方式对催化柴油加氢转化工艺的影响。结果表明,随体系压力增加轻、重石脑油收率明显增加而转化柴油相应降低;随裂化温度增加汽油馏分明显增加且辛烷值有所提高,柴油馏分十六烷值呈先增加后降低的趋势;当控制精制油氮含量为35μg/g时,加氢转化工艺得到的产品质量最佳,汽油馏分研究法辛烷值达90以上,为优质的清洁高辛烷值汽油调和组分;从产品质量方面考虑部分循环操作方式最佳,可得到辛烷值超过90的汽油组分与十六烷值在45左右的清洁柴油馏分,加氢转化工艺是劣质催化裂化柴油高附加利用的优质路线。 相似文献
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盐精制提高催化裂化柴油的安定性 总被引:11,自引:1,他引:10
找到一种精制催化裂化柴油安定性的盐-强碱弱酸盐(硅酸钠)溶液,该盐腐蚀性低,其精制效果与烧碱相当。剂油体积比在(1:20)-(1:250)范围内,精制油收率达到99%以上。盐在精制油中含量低,经水洗即可除去。 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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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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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 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