Study On The Clean Production Technology Of The Glycyrrhizic Acid

In this paper,membrane technology had been used to improve the traditional production technology of glycyrrhizic acid(GA).Researches had been done systematically about the checking,extraction and separation.A thorough discussion had been done about the choosing, work characteristics and cleanout method of membrane.1.The HPLC analysis conditions of the glycyrrhizic acid was decided.The correlative coefficient R2=0.999903,standard deviation of the repetitive experiments was 0.3886, relative standard deviation was 0.42%.The method was exact and reliable.2.The influence factors of GA extraction had been studied,and the technologic parameter had been decided.The rate of extraction was 2.90%.3.Researches and discussions had been done about the impurity removal and concentration technology about the extraction liquid of GA by membranes. The yield of one-order-membrane technology was 2.81%,which was much better than that produced by the traditional technology. The purity of the GA produced by two-oder-membrane technology was 42.12%,the yield was 2.75%,both of which were better than that produced by the traditional technology. The purity of the GA produced by three -order-membrane technology was 60.92%,which was a significant advance from the traditional technology.The consumptions of the oil of vitriol were respectively 20.75%,18.07% and 16.21% of that in the traditional technology.The wastewater produced in three technologies above were respectively 9.53%,9.53% and 8.82% of that in the traditional technology.4.Researches had been done about the relamation technology of the wastewater. The conditions of the flocculation before the electrodialysis technology,the technology parameters of electrodialysis, and the membrane and the technology parameters to the concentration of desalted water of electrodialysis were decided.5. Researches had been done about the cleanout of inorganic membranes and organic membranes.The compounding recipe of chemical detergent and the work conditions were decided. Experiments showed that the flux of fresh water recovered approximately to that of the new membranes after purged in the experiment condition. Impurity was removed and the extracted liquid was concentrated by membrane.The purity and jield were heightened,The consumption of the oil of vitriol was dramatically reduced,and the wastewater was recycled after desalting and concentration,meanwhile the concentrated solution was reused through spray drying.There was no production of three types of wastes,pollution was controlled in the process and curbed from the source,clean production came true authentically.It accorded with the recycle economy tenet,in answer to the law of people's republic of China on promoting clean production,was the demand of the sustainable development strategy.