METHOD OF PRODUCTION OF PURE BENZENE AND PURE TOLUENE AND DEVICE FOR ITS EMBODIMENT Russian patent published in 1999 - IPC

FIELD: methods of production of pure benzene and pure toluene from initial product containing aromatic hydrocarbons. SUBSTANCE: method includes freeing of initial product from gases in stabilization process distillation stage 1; separation of stabilized initial product into intermediate product enriched in benzene and into intermediate product enriched in toluene; supply of intermediate products enriched in benzene and toluene to process stage 2 of extractive distillation, and supply of them separately to different plates of extractive distillation column 4. In so doing, mixture of pure benzene, pure benzene, pure toluene and extracting agent is separated from lower part 3 of extractive distillation column 4, and extracting agent in stripping process stage 5 is separated from pure benzene and pure toluene and returned to extractive distillation process stage 2. Process is distinguished by the fact that stabilization process distillation stage 1 is equipped for separation of initial product into intermediate product enriched in benzene and intermediate product enriched in toluene, and intermediate product enriched in benzene is supplied directly from stabilization process distillation stage to process stage of extractive distillation, and intermediate product enriched in toluene, prior to supply to extractive distillation process stage 2, is freed from high-boiling components in preliminary distillation process stage 6. EFFECT: higher economic efficiency of process and increased purity of desired products. 10 cl, 1 dwg, 1 tbl