Study On The Synthesis And Hydrolysis Of Diethyl Oxalate With Reactive Distillation Technology

The engineering experimental training teaching was a very important part of higher vocational education, and Establishment training base was an important means to achieve the practice teaching system, while the base mode of operation is the key to the decision training teaching effect. The use of real chemical materials for practical teaching is a best model, but it will inevitably bring about a series of problems, mainly in the following aspects:to increase the input of fund for the practice teaching, to treat chemical material and deal with relevant formalities, etc. In accordance with the principle of security, economic and feasible, the feasibility of hydrolysis and synthesis of diethyl oxalate was investigated in this issue, and the "closed circle" between of raw materials and products was established. So this study provided technical support for establishment training base and its operation mode.At present, some problems were existed in the manufacture of diethyl oxalate, such as the lengthy reaction time, low yield and serious pollution. The industrial production of oxalic acid was blank stage by diethyl oxalate hydrolysis, and the hydrolysis process of diethyl oxalate was also not yet ripe. To address these issues, the primary works in this paper are presented as follows: To design a new distillation experimental device and to achieve synthesis or hydrolysis diethyl oxalate by reactive distillation coupling.The reactive distillation coupling technology of hydrolysis diethyl oxalate was studied. Strongly Acidic Cation Exchange Resin was used as a catalyst in the reactor. The influences of reaction conditions on the hydrolysis reaction was studied in the reactive distillation column, including tower reactor temperature, feed fluxes, reflux ratio and water and ester ratio of the amount of material. The results showed that the diethyl oxalate hydrolysis rate can reach about 98.5%.A new method was used to synthesis diethyl oxalate by reactive distillation technology. At the same time, the effect of esterification reaction by various agents, such as the choice of ethanol, different types of entrainer, tower reactor temperature, feed position, fluxes, and alcohol and acid reflux ratio of the amount of material, was investigated. As a result, the diethyl oxalate esterification rate of 97.5% was obtained.Compared to traditional methods, reactive distillation coupling technology in the fields of synthesis or hydrolysis diethyl oxalate has better application prospects. This new technology has overcomed the shortcomings of traditional methods, reduced energy consumption and pollution in the production process; and was innovative in China. So it has a strong promotional value.The far-reaching significance of the study indicated that the "closed circle" process provides a new research direction in the exploration of the chemical production practical training system.