关键词: 萃取, 吸附, 再生, 大孔吸附树脂, 辛醇, 废碱液

Abstract: Extraction and adsorption was adopted in sequence to remove the large amount of organics in the aldolisation spent caustic, wherein 2-ethyl hexanol was used as extractant which was then recovered by rectification, and HYA-106 macroporous resin was used for adsorption which showed stable adsorption-desorption performance. The results showed that under the conditions of pH=3, the volume ratio of 2-ethyl hexanol to spent caustic was 0.5 and the extraction stages was 2, ρ(COD) of the spent caustic could be decreased from 104651mg/L to 6453mg/L, while the ρ(COD) removal rate reached over 93.8%. At 40℃, the adsorption rate of HYA-106 macroporous adsorption resin was 1BV/h, ρ(COD) of the extraction effluent was decreased to 155-183mg/L, while ρ(COD) removal rate was 97.1%-97.4%. The total ρ(COD) removal rate of the combined extraction and adsorption process reached more than 99.8%, showing the organics in the spent caustic was removed to a maximal extent.

Key words: extraction, adsorption, regeneration, macroporous adsorption resin, 2-ethyl hexanol, spent caustic