METHOD FOR RECOVERING ACRYLIC ACID

摘要

A METHOD FOR RECOVERING ACRYLIC ACID FROM HIGH BOILING IMPURITIES CONTAINING ACRYLIC ACID DIMER, ACRYLIC ACID AND MALEIC ACID AT HIGH EFFICIENCY WITH STABILITY IS PROVIDED. SAID METHOD IS CHARACTERIZED BY (1) INTRODUCING SAID HIGH BOILING IMPURITIES CONTAINING ACRYLIC ACID DIMER, ACRYLIC ACID AND MALEIC ACID INTO AN ACRYLIC ACID RECOVERY COLUMN, DISTILLING ACRYLIC ACID FROM THE COLUMN TOP AND RECOVERING THE SAME.(2) INTRODUCING BOTTOM LIQUID A FROM SAID ACRYLIC ACID RECOVERY COLUMN INTO A PYROLYZING TANK TO DECOMPOSE THE ACRYLIC ACID DIMER IN THE BOTTOM LIQUID A, AND (3) RECIRCULATING AT LEAST A PART OF BOTTOM LIQUID B FROM SAID PYROLYZING TANK INTO THE ACRYLIC ACID RECOVERY COLUMN.