| 摘要 |
A method for the preparation of polymer grade 4,4'-dichlorodiphenyl sulfone (DCDPS) which is substantially free of 2,4' and 3,4'-isomers of dichlorodiphenyl sulfone with yield of over 90%, with substantially reduced reaction times without the use of impregnated catalysts. Furthermore, the reactants and byproducts are substantially recycled. The process involves reacting dimethyl sulfate with sulfur trioxide, reacting the formed dimethyl pyrosulfate with unreacted sulfur trioxide, reacting the mixture with monochlorobenzene, isolating the crude DCDPS using solvent extraction, recovering the solvent from the mother liquor and crystallizing the pure DCDPS. In another aspect, a process in which isomeric mixture of 4,4'-, and 2,4'-dichlorodiphenyl sulfone produced during the preparation of DCDPS is converted to value added products such as diphenyl sulfone, 2,4'- dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfone and 2-aminodiphenyl sulfone. |
