文献类型：专利

英文题名：Recycling acetic acid from industrial wastewater comprises e.g. passing recovered residual water into wastewater storage tank, raising temperature of adsorbing column after dehydrating for acetic acid desorption, and condensing

作者：HOU B;ZHOU Q;XIE Y;SHI Y;LE Q

机构：[1]UNIV EAST CHINA SCI&TECHNOLOGY

申请号：CN102381955-A

申请日：2010-08-31

公开日：2012-03-21

语种：英文

收录：DERWENT

摘要：NOVELTY - Recycling acetic acid from industrial wastewater comprises: filling wastewater having less than 0.5% of acetic acid content with solid adsorbent into an adsorbing column until adsorption reaches saturation point; performing thermal regeneration of adsorption column when the adsorption reaches saturation point, removing residual water, and passing the recovered residual water into wastewater storage tank; raising the temperature of the adsorbing column after dehydrating so as to make acetic acid desorption, condensing and collecting desorption solution, i.e. concentrated acetic acid solution. USE - The method is useful for recycling acetic acid from industrial wastewater. ADVANTAGE - The method: is based on physical process; needs no chemical agent; is environmental friendly and does not cause secondary pollution; uses the device which is simple, convenient to operate and control; makes the acetic acid solution to return to its original state in the industrial normal acetic acid separating apparatus for further concentrating to obtain high purity acetic acid product. DETAILED DESCRIPTION - Recycling acetic acid from industrial wastewater comprises: (i) filling wastewater having less than 0.5% of acetic acid content, and solid adsorbent into an adsorbing column until the adsorption reaches saturation point, where the wastewater flow speed is 0.5-3 bed volume/hour, and the adsorbent is active carbon, molecular sieve, zeolite, metal oxide and solid adsorbent; (ii) performing thermal regeneration of adsorption column when the adsorption reaches saturation point, controlling the temperature at 105-150 degrees C to remove the residual water in the adsorption column, and controlling the residual water recovery ratio (distillate volume/adsorption column residual fluid volume) as 30-60%, and passing the recovered residual water into wastewater storage tank; (iii) raising the temperature of the adsorbing column after dehydrating, controlling the temperature at 280-350 degrees C so as to make acetic acid desorption from the adsorption column, condensing by normal method and collecting the desorption solution, i.e. concentrated acetic acid solution; (iv) step-by-step thermal regeneration of the adsorbent, which can be re-used, and completing the cycle.