| abstract |
The present invention relates to a kind of preparation methods that drug second poplar benzene willow amine is prepared using carbasalate calcium finished mother liquid recovery article；Recycling calcium salicylate is acted on by the oxide or hydroxide of carbasalate calcium finished mother liquid and calcium the present invention provides a kind of, calcium salicylate reacts the new preparation process for preparing Trial of Etofesalamide with 4- phenetidine under condensing agent effect again；The process stabilizing, easy to operate, with short production cycle, good product quality, high income, conversion ratio almost 100% realize comprehensive cyclic utilization, and production cost is low, and low energy consumption, and the three wastes are few, are suitble to industrialized production. |