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NiW/Al2O3催化剂上二苯并噻吩的加氢脱硫宏观动力学 总被引:2,自引:0,他引:2
以二苯并噻吩(DBT)为含硫模型化合物,在实验室中压滴流床反应装置中研究了工业NiW/Al2O3催化剂RN-10上的加氢脱硫反应的动力学规律,详细考察了工艺条件:氢分压2.4~4.5 MPa、氢油比150~700(v/v)、液时空速(WHSV)15~60 h-1、反应温度300~380C对DBT转化率的影响.实验结果表明:提高反应温度可大大提高DBT的转化率,但反应温度达到330℃后,再提高反应温度,对DBT转化率的提升有限;在较高氢分压的条件下,DBT的转化率受氢分压的影响很小;当氢油比较小时,随着氢油比的提高,DBT转化率逐渐增加,但当氢油体积比大到一定程度(500)时,继续增大氢油比对脱硫率几乎没有影响.采用修正了的2级反应动力学模型对实验数据进行拟合,求得了二苯并噻吩加氢脱硫反应的表观活化能为75.95 kJ·mol-1.经检验,模型计算结果与实验结果能较好地吻合. 相似文献
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采用原位还原技术制备出Ni2P/TiO2-Al2O3催化剂,以喹啉为模型化合物对催化剂的加氢脱氮性能进行评价。主要考察复合载体中不同钛铝配比、不同Ni/P摩尔比对催化剂活性的影响及确定活性组分Ni2P负载量,确定该加氢脱氮催化剂最佳制备方法为:当n(Ti)/n(Al)=1/4,Ni2P负载量25%(wt)。在压力为3 MPa,体积空速为3 h-1,氢油体积比为500,反应温度为360℃的条件下,催化剂的加氢脱氮活性最高,可达98%。 相似文献
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《现代化工》2016,(10)
利用固定床加氢反应装置,以Mo-Ni/Al_2O_3为催化剂,首次对ATP页岩干馏装置油回收系统得到的页岩重油,经脱水脱渣预处理后切割分离所得的页岩柴油馏分进行加氢精制研究,考查了反应温度、反应压力、体积空速以及氢油体积比对加氢精制效果的影响。结果表明,在320~380℃、4.0~8.0 MPa、LHSV 0.5~2.0 h~(-1)、V(H_2)/V(Oil)200~1 200的范围内,提高反应温度,增大反应压力,降低体积空速,有利于ATP页岩柴油馏分的脱硫、脱氮和烯烃饱和,可明显提高加氢脱氮效果,氢油比高于1 000之后,增加氢油比对加氢脱硫和脱氮影响较小;抚矿ATP页岩柴油馏分在反应温度380℃、反应压力8.0 MPa、体积空速0.5 h~(-1)、氢油体积比1 000的条件下,加氢精制后所得产物油的杂原子和不饱和烃含量低、密度小、芳香烃含量少,可作为优质清洁柴油直接使用。 相似文献
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在固定床加氢微反装置上,采用硫化态NiMoW/Al2O3催化剂,以东宁轻质页岩油(<350℃馏分)为原料,考察反应条件对加氢脱氮性能的影响.结果表明,适当降低反应空速、提高反应压力、提高反应温度均有利于提高催化剂加氢脱氮反应活性,提高产物的质量.在反应温度380℃、反应压力8.0MPa、体积空速0.8h-1、氢/油体积比750∶1的条件下,加氢生成油的硫、氮、芳烃含量均明显降低,石脑油馏分可作为化工轻油,柴油馏分可直接作为清洁柴油调和组分使用. 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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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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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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杀虫磺缓释剂杀钉螺试验报告 总被引:1,自引:0,他引:1
杀虫磺缓释剂浸杀成螺、幼螺、螺卵效果好,现场应用缓释片63克/米^2,半年后活螺平均密度下降93.2%,春季施药1次,可达到控制当年钉螺的扩散。 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献