Abstract: Embodiments of this application provide an electronic device and a parameter determining method for an electronic device. The electronic device includes a first sound emitting unit, a second sound emitting unit, a first delay compensation unit, a first phase compensation unit, and a first amplitude compensation unit. The first delay compensation unit is configured to obtain a first playing audio signal. The first sound emitting unit is configured to emit a first playing sound signal based on the first playing audio signal. The first phase compensation unit and the first amplitude compensation unit are configured to respectively adjust a phase and an amplitude of the first original audio signal based on a first phase compensation function and a first amplitude compensation function, to obtain a first cancellation audio signal. The second sound emitting unit is configured to emit a first cancellation sound signal based on the first cancellation audio signal.

Abstract: A method for preparing chromium(III) pyridine-2-carboxylate using 2-OP rectification residues, including: subjecting the 2-OP rectification residues to in-situ catalytic pyrolysis and vacuum distillation, room-temperature crystallization and separation, recrystallization and dehydration, alkali-catalyzed hydrolysis, acidification and complexation, and separation, washing and drying to prepare a chromium(III) pyridine-2-carboxylate product, of which a yield is greater than 50% of the weight of the 2-OP rectification residues. The acidification and complexation includes: cooling the aqueous solution containing sodium pyridine-2-carboxylate obtained from the alkali-catalyzed hydrolysis to a temperature below 50° C.; adjusting the aqueous solution to pH 3.0-8.5 with 5-50 wt % dilute H2SO4 or 3-30 wt % dilute HCl followed by batchwise addition of CrCl3, Cr(NO3)3 or Cr2(SO4)3 for complexation at 20-70° C.

Abstract: A method for preparing chromium(III) pyridine-2-carboxylate using 2-OP rectification residues, including: subjecting the 2-OP rectification residues to in-situ catalytic pyrolysis and vacuum distillation, room-temperature crystallization and separation, recrystallization and dehydration, alkali-catalyzed hydrolysis, acidification and complexation, and separation, washing and drying to prepare a chromium(III) pyridine-2-carboxylate product, of which a yield is greater than 50% of the weight of the 2-OP rectification residues. The acidification and complexation includes: cooling the aqueous solution containing sodium pyridine-2-carboxylate obtained from the alkali-catalyzed hydrolysis to a temperature below 50° C.; adjusting the aqueous solution to pH 3.0-8.5 with 5-50 wt % dilute H2SO4 or 3-30 wt % dilute HCl followed by batchwise addition of CrCl3, Cr(NO3)3 or Cr2(SO4)3 for complexation at 20-70° C.