Study On New Separation Process Of Isopropenyl Acetate In The Production Of Acetylacetone

As a wildly used organism, acetylacetone was prepared mainly by the absorption of ketene and thermal transition. Isopropenyl acetate, an intermediate product of acetylacetone, was synthesized by acetone and ketene in the condition of the existence of strong acid catalyst. When distilled the mixture of isopropenyl acetate, it was coked and bulked badly, influenced the yield and blocked the pipeline. Acetic anhydride, high boiling component from absorption solution, aided the decomposition of isopropenyl acetate during the separation process, thus, obtained high purity product of isopropenyl acetate was difficultly. Improved yield of isopropenyl acetate and avoided coke, and disposed the residue and recovered useful components. In addition, purified isopropenyl acetate to the concentration of 99.5% or above at the existing conditions, these are all have to researched at present. The separation and purify of isopropenyl acetate in the productive technology of acetyl acetone by cracking process was studied in this paper. The feasible measures about recovering the residue and resolving coking problem were studied in my experiment. High distillation recovery of absorption solution was realized by improving equipment condition. Simulated and optimized the process of refining isopropenyl acetate on the basis of researching the vapor-liquid equilibrium of isopropenyl acetate, acetone and acetic anhydride.Experiment mainly researched about hydrolyzing the residue in acid solution, decomposing heat sensitive materials, and hydrolyzed solution turned into the mixtures of acetone, isopropenyl acetate and acetic anhydride. Hydrolyzed reactions benefited to distillate and recover useful components from residue, and avoided coking during distillation. Used thin film evaporation instead of pervious simple still, improved recovery of isopropenyl acetate and guaranteed residual discharged in liquid form. Researched thermodynamic study about isopropenyl, acetone and acetic anhydride, and got the binary cross-linking parameters of those three components. Under the premise of the thermal decomposition of isopropenyl acetate and bringing in little acetone in the distillation, Used side-by discharge method could get the isopropenyl acetate up to 99.5% purity and realized the industrial requirement.