b
Thank You！
Your requirement has been sent, we will contact you quickly!
Sent Failed！
Try again!
Our production process is mainly: by glyoxal through the ring, neutralization and obtained. The preparation method is to put glyoxal, formaldehyde and ammonium sulfate into the reaction pot, stir and heat to 85 ~ 88℃, keep warm for 4h, cool to 50 ~ 60℃, neutralize with lime water to pH = 10 or more, heat to 85 ~ 9Chemicalbook0℃, discharge ammonia for more than 1 hour, slightly cold, filter, filter cake washed with hot water, combined wash filtrate, When the concentration was reduced to anhydrous evaporation, the distillation was continued until the low boiling matter was all steamed, and the demidazole was collected in the fraction of 105 ~ 160℃/133 ~ 266Pa. The yield is about 45%.
CRO
