摘要:
A method for preparing propylene oxide by oxidizing propylene with atmospheric oxygen in the presence of oxyfluoride derivatives of molybdenum or tungsten, or mixtures thereof, for example, (Me)2MoO2F4, (Me)2WO2F4 or (Me)3W2O4F7, where Me is NH4, K, Rb or Cs. The oxidation is carried out in organic solvents oxidizable to hydroperoxides, for example ethylbenzene, isobutane and isopentane.
摘要翻译:在钼或钨的氟氧化物衍生物或其混合物的存在下,例如(Me)2MoO 2 F 4,(Me)2 WO 2 F 4或(Me)3 W 2 O 4 F 7(其中Me是NH 4),通过用大气氧氧化丙烯来制备环氧丙烷的方法, K,Rb或Cs。 氧化在可氧化成氢过氧化物的有机溶剂中进行,例如乙苯,异丁烷和异戊烷。
摘要:
A pulsed VHF radio spectrometer for the invenstigation of nuclear quadrupole resonance (NQR) in solids, in which the tuning arrangements of the anode and grid tanks in a double-tank r.f. pulse oscillator are kinematically linked to each other and to the tuning arrangement of the tuned circuit of a local oscillator by means of a drive having a programmer. The latter is made such that the grid tank in the r.f. pulse oscillator and the localoscillator tuned circuit are swept in frequency in a predetermined manner. The radio spectrometer disclosed herein has an inductance coil to enclose the solid test specimen, which is electrically connected to the r.f. pulse oscillator through a matching means which matches the impedance of the inductance coil to the impedance of the anode tank in the r.f. pulse oscillator. The circuit parameters of the matching means and the circuit parameters of the inductance coil determine the above-mentioned manner for frequency sweeping.