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两段提升管重油催化裂化(Ⅰ型)新工艺的初步研究 总被引:7,自引:0,他引:7
针对目前催化裂化提升管反应器后半段催化剂性能严重下降以及产品分布不太合理的状况,提出了采用两段提升管催化裂化新工艺技术取代常规的单段提升管催化裂化工艺技术.该工艺的突出特征是催化剂接力、分段反应、大剂油比和短反应时间. 在对新工艺进行理论分析的基础上,以大庆蜡油掺兑65%渣油为原料,采用ZC-7300催化剂,在小型提升管催化裂化装置上进行了一系列实验,考察两段提升管催化裂化(Ⅰ型)新工艺的可行性和先进性. 实验结果表明:与常规单段工艺相比,在相近转化率下,两段柴油产率提高6~8个百分点,轻油产率提高1~2个百分点;汽油烯烃含量减少,辛烷值提高,产品质量提高. 新工艺在提高柴油收率及改善产品分布和产品质量方面具有明显优势. 相似文献
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异丁烯为原料制备甲基丙烯酸甲酯的催化剂 总被引:4,自引:1,他引:3
The catalysts used for manufacturing methyl methacrylate (MMA) by two-step conversion of isobutylene via methacrolein (MAID were studied. The selective oxidation of isobutylene to MAL was carried out in a fixed-bed flow microreactor using a series of Mo-Bi-containing catalysts and the oxidative esterification of MAL to MMA was carried out in a slurry-bed reactor using a series of palladiumcontaining catalysts. By means of BET and XPS, the properties of the catalysts were characterized. It was found that the performance of Mo-Bi-Co-Fe-Ce-O catalyst was improved distinctly when Cs was added for the selective oxidation of isobutylene to MAL, and the Pd5Bi2PbFe/CaCO3 catalyst with the loading sequence of Pd, Pb and Bi, Fe showed the best performance for the oxidative esterification of MAL to MMA. 相似文献
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基于MIKE11建立了苏北灌溉总渠一维河道水流模型,采用2015年、2021年实测地形及洪水资料对模型进行了率定和验证,且计算值与实测值均吻合较好,所建模型能较好模拟河道洪水演进过程。采用该模型对2021年地形条件下河道现状行洪能力进行了计算,结果表明:苏北灌溉总渠现状行洪能力局部河段不满足800 m3/s的设计标准,总渠地涵至入海口段仅为设计行洪能力的50%。入海口处六垛南闸下港道淤积是河道行洪能力不足的主要影响因素,造成上游河道主要控制节点水位最大壅高0.78 m;采用闸下港道清淤等工程措施后,可有效恢复河道行洪能力。 相似文献
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根据分子结构中结构基团个数少于或等于原子个数的规律,提出了基于结构族概念识别分子的 SGM 方法(Structural groups-based method),发展了新的分子识别工具--连通识别符(Connectivity ID)。连通识别符可以有效地提取分子特征,也可以容易地进行识别同分异构体分子。实例研究表明,SGM 方法是有效的分子识别工具。 相似文献
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Conductivities of AlCl3/Ionic Liquid Systems and Their Application in Electrodeposition of Aluminium
Solubilities and conductivities of anhydrous AlCl3 in six kinds of ionic liquids (ILs) were measured. Among the six kinds of ILs [bmim]Cl, [bmim]Br, [bmim]BF4, [bmim]PF6, [emim][EtSO4] and [bmim][HSO4], anhydrous AlCl3 could be dissolved in the first five kinds but was hardly dissolved in [bmim][HSO4]. The results showed that the nominal solubilities of AlCl3 in ILs increased in the order of [bmim][HSO4] < [bmim]PF6 < [emim][EtSO4] < [bmim]BF4 < [bmim]Cl < [bmim]Br. Conductivities of the AlCl3/ILs systems depended apparently on the nominal molar ratio of AlCl3 to ILs. The conductivities of AlCl3/[bmim]Cl, AlCl3/[bmim]Br and AlCl3/[bmim]PF6 systems had a similar tendency as a function of the nominal molar ratio, that is, as the molar ratio was increased, conductivities increased first and then decreased, with the maximum conductivity obtained at approximately 0.9:1, 1.0:1 and 0.5:1, respectively. Conductivities of the AlCl3/[bmim]BF4 exhibited a dentate change and decreased with the molar ratio of AlCl3 to [bmim]BF4 increasing in general. With the increasing of the anhydrous AlCl3 amount in [emim][EtSO4], conductivity of AlCl3/[emim][EtSO4] monotonically decreased. AlCl3/[bmim]Cl system was chosen as the electrolyte for the electrodeposition of Al. Preliminary experimental results showed that dense, adherent and homogeneous Al coatings could be electrodeposited on stainless steel by means of constant potential technique and the surface coverage was quite satisfactory. 相似文献
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加压–常压精馏分离甲醇–碳酸二甲酯的相平衡和流程模拟 总被引:15,自引:1,他引:15
变压精馏是分离共沸混合物的有效方法. 本文在计算机模拟和分析的基础上, 提出了加压–常压串联分离甲醇–碳酸二甲酯共沸体系的工艺方法. 采用UNIQUAC方程来表征甲醇–碳酸二甲酯二元共沸体系的气液平衡. 根据实验数据,回归了该热力学模型中的交互作用参数,模型的计算结果与实际数据吻合. 模型的适用范围为:压力0.1~1.5 MPa, 温度337~440 K. 基于平衡级模型,对加压精馏塔进行了模拟计算, 分析了各主要操作参数对分离效率、产品纯度及操作费用的影响. 在对加压–常压串联流程模拟的基础上,得到了最佳分离操作工艺参数. 模拟结果对工业过程的设计和改造具有一定的指导意义. 相似文献
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