Preparation of N-Butyl Acetate from Dilute Acetic Acid Wastewater by Phase Transfer Catalyst CTMAB

Abstract:

The experiment disposing waste water with dilute acetic acid aimed to recycle acetic acid and synthesize high value added n-butyl acetate with cetyl trimethyl ammonium bromide (CTMAB) as the phrase transfer catalyst. Over-dose n-butanol was added and n-butyl acetate was extracted with the mixed solution of trioctylamine (TOA) (20%,w) and tributylphosphate (TBP) (80%,w) as the extractant. After the still standing and liquid separation, the organic phase was depressurized and distilled under the pressure 25kPa.The n-butanol and a part of acetic acid were recycled, and n-butyl acetate was collected between temperature 70°C-75°C. The synthetic process parameters were optimized, that was: CTMAB 0.35g /0.127mol acetic acid, TOA/TBP 30ml, the ratio of alcohol and acid 1.3:1.0, reaction time 2.5h, reaction temperature 30°C.The extraction rate of acetic acid was 88.2%.The yield of n-butyl acetate was 81.3% and phrase transfer catalyst with extractant was recycled for 6 times whose effect was reduced a little but good enough. This experiment, which included esterification reaction with phase transfer catalyst and extractive distillation process, has received a satisfactory effect and can be used in similar system.

• Periodical: Advanced Materials Research (Volumes 1073-1076)
• Pages: 970-974
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1073-1076.970
• Online since: December 2014
• Authors: Xue Kun Li*, Ping Sun, Yue Hua Zhou, Wen Hong Li
• Keywords: Acetic Acid, Extraction, N-Butyl Acetate, Phase Transfer Catalysis, Waste Water

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