Study On Synthesis Technology Of A New Type Diol-2-Methyl-1, 3-Propanediol

As important industrial chemicals, dihydroxy alcohols are applied for many fields, classical dihydroxy alcohols include l,4BD0, diglycol, NPG, 1,3PDO, HDO and so on. MPO is a kind of new dihydroxy alcohols. Because of its unique molecular structure, 2-methyl-1,3-propanediol(MPO) is instead of classical dihydroxy alcohols gradually. So MPO has huge market foreground. But MPO has not been had a integrated production technology in China.A new synthesis route: the preparation of MPO, which 2-methyl-1-propene reacted with chlorine, alkali and hydrogen was discussed. This process have a lot of excellences, such as simple equipments, advanced process, being convenient of manipulation, less devotion, being prone to come true and so on, at the same time, the route inaugurated another application for 2-methyl-1-propene, making up synthesis blank in China and abroad.First, a chlorinator was self-designed in this paper, and dichloride of 2-methyl-1-propene was synthesized by 2-methyl-1-propene reacted with chlorine fast in this reactor. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the yield and selectivity of dichloride of 2-methyl-1-prop-ene were more than 65% and 80% respectively. Second, the preparation of 2-methylene-1, 3-propanediol, which dichloride of 2-methyl-1-propene reacted with alkali was investigated. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the conversion of dichloride of 2-methyl-1-propene was 100%. Moreover the preparation of MPO, which 2-methylene-1, 3-propanediol reacted with hydrogen, in presence of Al₂O₃-Pd catalyst, was gotten, and the product was appraised. So the route was opened up.In addition, in order to cater for engineering design and application, interfacial forces of pure product and MPO+H₂O were studied in this paper. A mass of base data were provided for application of this new dihydroxy alcohols.