PROCESS FOR THE PURIFICATION OF (METH) ACRYLIC ACID AND/OR ITS ESTER

摘要

IN A PROCESS FOR THE PURIFICATION OF (METH) ACRYLIC ACID AND/OR ITS ESTER USING A DISTILLATION UNIT COMPRISING A DISTILLATION COLUMN (1), A MULTITUBULAR REBOILER (2), AND A PIPE (3,13) CONNECTING THESE ELEMENTS, AN OXYGEN CONTAINING GAS IS SUPPLIED FROM AT LEAST ONE POINT IN REGIONS BETWEEN THE DISTILLATION COLUMN (1) AND AN INLET OF THE MULTITUBULAR REBOILER (2) AND/OR IN REGIONS BETWEEN THE INLET AND AN INLET SIDE TUBE SHEET (5) OF THE MULTITUBULAR REBOILER. THIS PROCESS CAN EFFECTIVELY PREVENT THE FORMATION OF POLYMERIZATION PRODUCTS AND CAN STABLY PURIFY (METH) ACRYLIC ACID AND/OR ITS ESTER OVER A LONG TIME. (FIG.1)