基于重油高效催化裂解(RTC)装置的工艺特点和产物分布需求,兼顾对开工催化剂流化性能、物化性能的要求,科学混配优选平衡剂组分、定制新鲜剂组分和惰性助剂,开发了定制开工剂TSC-R1。与传统的开工剂相比,定制开工剂物性指标优异,具有更...基于重油高效催化裂解(RTC)装置的工艺特点和产物分布需求,兼顾对开工催化剂流化性能、物化性能的要求,科学混配优选平衡剂组分、定制新鲜剂组分和惰性助剂,开发了定制开工剂TSC-R1。与传统的开工剂相比,定制开工剂物性指标优异,具有更高的丙烯因子和更低的焦炭选择性,可以快速匹配目标装置的开工需求。在中国石化安庆分公司3.00 Mt a RTC装置上的工业应用表明,装置调整时间大幅缩短,装置仅需7 d即可达到稳定运行状态催化剂反应活性快速达到平稳,有助于装置的产品分布更快地达到设计工况,保证经济效益。展开更多
A widely used herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was imprinted on poly (4-vinylpyridine) (4-VP) using (40%) ethyleneglycol dimethacrylate (EGDMA) as crosslinking agent. The classical imprinting technolog...A widely used herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was imprinted on poly (4-vinylpyridine) (4-VP) using (40%) ethyleneglycol dimethacrylate (EGDMA) as crosslinking agent. The classical imprinting technology makes use of a high degree of crosslinking which does not allow the template molecules to move freely. So the binding sites, located in the central area of the three dimensional polymer matrix are hard to be accessed and the template molecules cannot be extracted totally. But here we propose a low crosslinked system with high specificity and selectivity. The imprinted and non-imprinted polymers were characterized by various spectroscopic techniques. The extent of binding was followed by batch equilibration method and compared with the respective non-imprinted polymer. Conditions for maximum specific rebinding were set by altering certain factors like template/monomer ratio, concentration of template solution, rebinding medium, mass of polymer and time of incubation. The selectivity of the imprinted polymer was investigated by comparing the binding with structural analogues of 2,4-D like, phenoxyacetic acid (POA), 4-chlorophenoxyacetic acid (4-CPOA) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T). The imprinted polymer exhibited high affinity towards the template molecule and was selectively rebound to the specific sites. The binding towards the structural analogues depends on the number of chlorine in the benzene ring.展开更多
The atomic selective multi-step photoionization process is a critical step in laser isotope separation.In this work,we study three-step photoionization processes with non-monochromatic laser fields theoretically based...The atomic selective multi-step photoionization process is a critical step in laser isotope separation.In this work,we study three-step photoionization processes with non-monochromatic laser fields theoretically based on the semi-classical theory.Firstly,three bandwidth models,including the chaotic field model,de-correlation model,and phase diffusion model,are introduced into the density matrix equations.The numerical results are compared with each other comprehensively.The phase diffusion model is selected for further simulations in terms of the correspondence degree to physical practice.Subsequently,numerical calculations are carried out to identify the influences of systematic parameters,including laser parameters(Rabi frequency,bandwidth,relative time delay,frequency detuning)and atomic Doppler broadening,on photoionization processes.In order to determine the optimal match among different systematic parameters,the ionization yield of resonant isotope,and selectivity factor are adopted as evaluation indexes to guide the design and optimization process.The results in this work can provide a rewarding reference for laser isotope separation.展开更多
A novel defected ground structure （DGS） for the microstrip line is proposed in this paper. The DGS lattice has more defect parameters so that it can provide better performance than the conventional dumbbell-shaped D...A novel defected ground structure （DGS） for the microstrip line is proposed in this paper. The DGS lattice has more defect parameters so that it can provide better performance than the conventional dumbbell-shaped DGS. Selectivity is improved by 97.2% with a sharpness factor of 24.6%. The method is applied to the design of a low-pass filter to confirm validity of the proposed DGS.展开更多
文摘基于重油高效催化裂解(RTC)装置的工艺特点和产物分布需求,兼顾对开工催化剂流化性能、物化性能的要求,科学混配优选平衡剂组分、定制新鲜剂组分和惰性助剂,开发了定制开工剂TSC-R1。与传统的开工剂相比,定制开工剂物性指标优异,具有更高的丙烯因子和更低的焦炭选择性,可以快速匹配目标装置的开工需求。在中国石化安庆分公司3.00 Mt a RTC装置上的工业应用表明,装置调整时间大幅缩短,装置仅需7 d即可达到稳定运行状态催化剂反应活性快速达到平稳,有助于装置的产品分布更快地达到设计工况,保证经济效益。
文摘A widely used herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was imprinted on poly (4-vinylpyridine) (4-VP) using (40%) ethyleneglycol dimethacrylate (EGDMA) as crosslinking agent. The classical imprinting technology makes use of a high degree of crosslinking which does not allow the template molecules to move freely. So the binding sites, located in the central area of the three dimensional polymer matrix are hard to be accessed and the template molecules cannot be extracted totally. But here we propose a low crosslinked system with high specificity and selectivity. The imprinted and non-imprinted polymers were characterized by various spectroscopic techniques. The extent of binding was followed by batch equilibration method and compared with the respective non-imprinted polymer. Conditions for maximum specific rebinding were set by altering certain factors like template/monomer ratio, concentration of template solution, rebinding medium, mass of polymer and time of incubation. The selectivity of the imprinted polymer was investigated by comparing the binding with structural analogues of 2,4-D like, phenoxyacetic acid (POA), 4-chlorophenoxyacetic acid (4-CPOA) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T). The imprinted polymer exhibited high affinity towards the template molecule and was selectively rebound to the specific sites. The binding towards the structural analogues depends on the number of chlorine in the benzene ring.
文摘The atomic selective multi-step photoionization process is a critical step in laser isotope separation.In this work,we study three-step photoionization processes with non-monochromatic laser fields theoretically based on the semi-classical theory.Firstly,three bandwidth models,including the chaotic field model,de-correlation model,and phase diffusion model,are introduced into the density matrix equations.The numerical results are compared with each other comprehensively.The phase diffusion model is selected for further simulations in terms of the correspondence degree to physical practice.Subsequently,numerical calculations are carried out to identify the influences of systematic parameters,including laser parameters(Rabi frequency,bandwidth,relative time delay,frequency detuning)and atomic Doppler broadening,on photoionization processes.In order to determine the optimal match among different systematic parameters,the ionization yield of resonant isotope,and selectivity factor are adopted as evaluation indexes to guide the design and optimization process.The results in this work can provide a rewarding reference for laser isotope separation.
基金Project supported by the Shanghai Leading Academic Discipline Project (Grant No.T0102)
文摘A novel defected ground structure （DGS） for the microstrip line is proposed in this paper. The DGS lattice has more defect parameters so that it can provide better performance than the conventional dumbbell-shaped DGS. Selectivity is improved by 97.2% with a sharpness factor of 24.6%. The method is applied to the design of a low-pass filter to confirm validity of the proposed DGS.
