Method for recycling acetic acid from industrial wastewater

• Main Authors: SHI YUNHAI, LE QINGHUA, HOU BAOJUN, ZHOU QUAN, XIE YOUGUO
• Format: Patent
• Language: Chinese; English
• Published: 21.03.2012
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention discloses a method for separating and recycling acetic acid from industrial wastewater by combined operation of absorption and heat regeneration step by step. The method comprises the steps of: absorbing and separating acetic acid from wastewater by solid absorbents such as active carbon, a molecular screen and zeolite and the like, then performing heating and regeneration for the absorption column step by step; heating to remove residual water in the column to condense absorbed acetic acid and then heating to desorb and recycle the absorbed acetic acid so as to regenerate the absorbents. An acetic acid solution which is greater than or equal to 30% in concentration can be recycled and obtained from wastewater with acetic acid which is smaller than or equal to 5% in concentration by the method. The method is mainly based on physical process without chemical separators, environmental-friendly without secondary pollution and has a simple device, is convenient to operate and control and has higher