Research On The Utilazation Of Indutrial Byproduct 1,2,3-trichloropropane

1,2,3-trichloropropane (TCP) is the main byproduct in the industrial production of epichlorohydrin process . With the producing of much more epichlorohydrin annually, the output of 1,2,3-trichloropropane rises greatly. Developping some high value-added chemical products with the cheap byproduct is the best way to solve the problem of TCP.The content of the paper can be divided into the following three sections :(1) 2,3-dichloropropene was prepared by elimination reaction using 1,2,3-trichloropropane as the raw material. The structure of the product was determined via IR and NMR. The influence of the material ratio, the reaction temperature and the reaction time on the yield were investigated through the orthogonal experiment. The optimum reaction condition was determined. The optimum reaction condition is as follows: ratio of NaOH to TCP equal to 1.4, reaction temperature of 60°C and reaction time 0.5h. Under this condition the yield of 2,3-dichloropropene is 70%.(2) 3-acetoxy-2-chloroprop-l-ene was prepared by substitution reaction using 2,3 -dichloropropene as the raw material. Product was obtained through extraction, drying and vacuum distillation. The product was characterized by IR and NMR. The conversion rate of the reaction was investigated by gas chromatography, and the influence of the solvent on the covertion of the reaction rate was discussed. The results show that using DMF as the solvent, the reaction time can be reduced and the extraction seperation of the product can be done more easily compared with DMSO, water and toluene as the solvent.(3) To achieve the goal of the green chemistry, water was used as the solvent to replace DMF. Through gas chromatography analysis and observing the effect of extraction seperation of the product, the influence of the reaction time and the amount of catalyst on the purity and polymerization of the product was studied. The results show that the purity of the product can be raised through adding the amount of the catalyst or prolonging the reaction time. However, when the concentration of 3-acetoxy-2-chloroprop-l-ene in the system reaches to some extent, the products would polymerize together, which leads to the decrease of the yield.