A new type of reactor,featured with impinging stream-rotating packed bed（IS-RPB）and coil pipes,was designed and used to prepare p-hydroxybenzaldehyde（PHB）by hydrolysis from diazonium salts.The influence of operati...A new type of reactor,featured with impinging stream-rotating packed bed（IS-RPB）and coil pipes,was designed and used to prepare p-hydroxybenzaldehyde（PHB）by hydrolysis from diazonium salts.The influence of operating parameters,such as reaction temperature,reaction time and high gravity factor,on the yield of PHB was investigated.Compared with the traditional kettle-type reactor,the yield of PHB with the new reactor is increased significantly and the reaction time is much shorter.Under the optimum conditions,the yield of PHB is increased from 51%to 84.1%.The reactor offers an opportunity for replacing the traditional batch mode operation with a continuous process.展开更多
Purpose A new rotating coil measurement system based on the coordinate measurement machine(CMM)is developed for measuring high-gradient small-aperture quadrupole magnet in the Test Facility of High Energy Photon Sourc...Purpose A new rotating coil measurement system based on the coordinate measurement machine(CMM)is developed for measuring high-gradient small-aperture quadrupole magnet in the Test Facility of High Energy Photon Source(HEPS-TF).Methods The CMMand two groups of Newport translate stages are combined to align the rotating coil relative to the magnet mechanical center.A high precision ceramic skeleton with bucked coil is made as a measurement sensor.The integrated field gradient,harmonics,magnetic center offset and excitation curve of a high-gradient small-aperture quadrupole prototype magnet are measured.Results The rotating coil is aligned to the magnet mechanical center within 10μm.The reproducibility of higher harmonics is within 0.2×10–4.The repeatability of the magnet center in horizontal direction is under 1.5μm,while that in vertical direction is less than 2.5μm in different days.The architecture of the measurement system,the measuring procedure and some primary results of the quadrupole prototype magnet are illustrated in this paper.Conclusion A rotating coil measurement system based on CMM has been well developed,and the collimation efficiency and precision are improved.The harmonic changes caused by iron fingers are measured by the measurement system.The difference between the measurement result and the OPERA-3D simulation result is less than 0.5×10–4.The performance of this measurement system can meet the magnet measurement requirements of HEPS-TF.展开更多
基金Supported by the Science and Technology Key Projects of Shanxi Province(20090321113)
文摘A new type of reactor,featured with impinging stream-rotating packed bed（IS-RPB）and coil pipes,was designed and used to prepare p-hydroxybenzaldehyde（PHB）by hydrolysis from diazonium salts.The influence of operating parameters,such as reaction temperature,reaction time and high gravity factor,on the yield of PHB was investigated.Compared with the traditional kettle-type reactor,the yield of PHB with the new reactor is increased significantly and the reaction time is much shorter.Under the optimum conditions,the yield of PHB is increased from 51%to 84.1%.The reactor offers an opportunity for replacing the traditional batch mode operation with a continuous process.
文摘Purpose A new rotating coil measurement system based on the coordinate measurement machine(CMM)is developed for measuring high-gradient small-aperture quadrupole magnet in the Test Facility of High Energy Photon Source(HEPS-TF).Methods The CMMand two groups of Newport translate stages are combined to align the rotating coil relative to the magnet mechanical center.A high precision ceramic skeleton with bucked coil is made as a measurement sensor.The integrated field gradient,harmonics,magnetic center offset and excitation curve of a high-gradient small-aperture quadrupole prototype magnet are measured.Results The rotating coil is aligned to the magnet mechanical center within 10μm.The reproducibility of higher harmonics is within 0.2×10–4.The repeatability of the magnet center in horizontal direction is under 1.5μm,while that in vertical direction is less than 2.5μm in different days.The architecture of the measurement system,the measuring procedure and some primary results of the quadrupole prototype magnet are illustrated in this paper.Conclusion A rotating coil measurement system based on CMM has been well developed,and the collimation efficiency and precision are improved.The harmonic changes caused by iron fingers are measured by the measurement system.The difference between the measurement result and the OPERA-3D simulation result is less than 0.5×10–4.The performance of this measurement system can meet the magnet measurement requirements of HEPS-TF.
