アクリル酸の製造方法

概要

論文の詳細を見る
A modified Reppe process for manufacturing acrylic acid (AA) under normal pressure and another method by hydrolysis of acrylonitrile (AN) are reported. I. Modified Reppe process using normal pressure under continous operation. Thier reaction is affected by various factors such as molar ratio, acetylene feeding velocity, reaction temperature, circulation velocity, viz, agitating velocity and so on. The best reaction conditions were as follows : Acetylene feeding velocity : 200 l/hr. Reaction temperature : 40°C Circulation velocity for the reaction mixture : 1, 800 l/hr. Reaction composition : AA/Solvent=1/1 (wt.) Solvents : MEK, MIBK The yield was about 80%. II. AN hydrolysis The follwing reactions for conversion of AN into AA were studied. CH2=CHCN+H2SO4+H2O→CH2=CHCONH2·H2SO4 CH2=CHCONH2·H2SO4 +H2O→CH2=CHCOOH + NH4HSO4 1. The first step reaction (formation of acrylamide). AN/sulfuric acid/water=1/1.5/4 (molar ratio) was employed at 12°C for 5 hrs with strring. The yield was about 95%. 2. The second step reaction (formation of AA) The hydrolysis of acrylamide was effected by using 6 mol suplementary water per mol of acrylamide at 100°C for 2 hrs with stirring. Over-all yield of AA was about 850. 3. Kinetics The apparent activation energy for the hydrolysis of AN was about 11.3 kcal/mol and the reaction was found to be second order in the concentrations of AN and water.
社団法人有機合成化学協会の論文