Method for preparing sodium acetate from acetic acid waste gas through alkaline absorption

The invention relates to a method for preparing sodium acetate from acetic acid waste gas through alkaline absorption. The method comprises the following steps: 1, inputting acetic acid waste gas to an alkaline absorption tower through an induced draft fan to carry out multistage circulated alkaline absorption, and emptying the absorbed air, wherein the acetic acid waste gas is generated in a chemical industry or drug production process; 2, controlling the alkaline absorption liquid temperature between 30 DEG C and 80 DEG C, and adding solid sodium hydroxide or sodium carbonate when the pH value is less than or equal to 10; 3, stopping adding alkaline when the concentration of the added sodium hydroxide or sodium carbonate is up to 25-50%, and inputting alkaline absorption liquid to a crystallization kettle when the pH value of the alkaline absorption liquid is up to 8-9; 4, cooling the alkaline absorption liquid to 10 DEG C below zero to 30 DEG C, and carrying out centrifugal swing filtration to obtain sodiu