Abstract
This study aims at the shortcomings of the current industrial application of acrylonitrile wastewater treatment, using alkali-catalyzed hydrothermal technology to convert acrylonitrile into acrylic acid for achieving resource utilization. In this study, alkali metal, alkaline earth metal hydroxide and composite solid base were used as catalysts to investigate catalytic effects of these solid based on the hydrothermal reaction. The results show when using the alkali and alkaline-earth metal hydroxides as catalysts, the best effect of treatment was KOH and the highest yield of acrylic acid reached 56.60%. It was also found that, among the three kinds of solid base catalysts (Ca-O-Mg, K-O-Al, K-O-Si) adopted with the same mass and various loading capacity, K-O-Si (15%) was the most effective catalyst for the conversion of acrylonitrile, and the highest yield of acrylic acid reached 57.78%. This process provides an environmentally friendly method toward the synthesis of useful acrylic acid from acrylonitrile within a very short time.
Highlights
Acrylonitrile, an important chemical material, has been widely used in many areas, including the manufacturing of acrylonitrile butadiene styrene (ABS) plastic, nitrile rubber, acrylic fiber, synthetic resins and other chemical products [1, 2]
Alkali metal, alkaline earth metal hydroxide and composite solid base were used as catalysts to investigate catalytic effects of these solid based on the hydrothermal reaction
3.1 Effect of alkali metal and alkaline earth metal hydroxides on the hydrothermal reaction of acrylonitrile
Summary
Acrylonitrile, an important chemical material, has been widely used in many areas, including the manufacturing of acrylonitrile butadiene styrene (ABS) plastic, nitrile rubber, acrylic fiber, synthetic resins and other chemical products [1, 2]. Several methods are available to treating the acrylonitrile wastewater include incineration, radiation [6], ozonation [7], adsorption [8], biodegradation [9], electro-Fenton (EF) [10]. They are either limited by their high cost of operation or secondary pollutants generation. A modified method, catalyst combined with the Supercritical Water, was used in this experiment. It enables conversion of acrylonitrile into acrylic acid with a comparatively high yield within a very short time
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