Study On The Preparation Of2-phosphonobutane-l,2,4-tricarboxylic Acid And Chloromethane Reation Characteristics

The2-phosphonobutane-1,2,4-tricarboxylic acid(PBTCA) is a kind of low phosphorus, excellent performance, very promising water treatment agent. At present, in the production of PBTCA main industrial methods are autocatalytic hydrolysis and high temperature steam hydrolysis. However, these methods have some obvious disadvantages, such as large energy consumption, produce a lot of alcohol wastewater, long reaction time and so on.In this paper, we used hydrogen chloride gas and2-phosphonobutane-1,2,4-tricarboxylic acid pentamethyl ester as raw material to synthesis PBTCA, and analysis the intermediate and final product by31P-NMR, through the contrast test and single factor experiment study the influence of the reaction by hydrogen chloride flow rate, stirring speed, reaction temperature and reaction time, and get the best process condition for synthesis of PBTCA is:hydrogen chloride flow rate:100L/h, stirring speed:800r/m, reaction temperature:373.15K, reaction time:6h. On this condition, yield of PBTCA is over98%. And to do a preliminary study on reaction mechanism.Through the reasonable hypothesis and on the basis of the experimental data, the dynamics equations are obtained. To determine the reactor of scale-up experiment through the analysis of the reaction and mass transfer properties and we did the scale-up experiments. In addition, we did the pilot design of the plant, the certain basis theoretical was provided for the industrial production in the future.