Catalytic Synthesis Of Glyphosate

N-phosphonomethylglycine(PMG) is a kind of herbicide which has the high effect, low toxicity and good bioactivity, destroys the ruderal after in bud, and derives from the amino acid. A method which accepts the noble metal supported in the active carbon to oxidize the N-phosphonomethyliminodiacetic acid(PMIDA) to produce the PMG is studied in this paper. And this method is really a valuable one which belongs to the range of green chemistry and has the good selectivity, yield and moderate condition, etc.After the preparatory experiment, a simple and feasible analysis method is assured to determine the concentration of the PMG, and the standard curve of the concentration is plotted. Then through the mono-factor's experiment the optimization of the reaction was investigated. Under the condition that the agitation rate is 442rpm, the temperature is 80℃, the pressure is 0.6MPa, the concentration of the catalyst is 0.7%, and the reaction time is 40~50mins, the highest yield was obtained which is above 90% of the content of PMG, 84.61% of the solid yield, and 88.02% of the total yield. Based on the experiment results, the conversions of the aimed product and the byproducts are explored deeply in the theory.Through the research of the various supported ratio of the different catalysts in the optimization condition, the instant concentration of PMG in the reaction is observed and the optimization time prolongs to about 80mins. And the depleting of the noble metals was analyzed and compared which is used to predict the results while using the higher supported ratio of the catalyst. And the mechanism of the noble metals and the transition metals' salts is also compared.