Biomass pretreatment by cooking with active oxygen and solid alkali (CAOSA): Selectively oxidation of CAOSA wastewater to formic and acetic acids

Add time:08/04/2019    Source:sciencedirect.com

Cooking with active oxygen and solid alkali (CAOSA), a oxygen delignification process for lignocellulose fractionation was developed by our group. In this study, a treatment process for yellow liquor, which is the aqueous solution of the CAOSA process, was proposed whilst producing formic and acetic acids with hydrothermal deep oxidation. A series of experiments were performed at reaction temperature of 160–280 °C and residence time of 30 s to 30 min. The highest yield of the acids defined as the total mass percentage of formic and acetic acids to biomass feedstock is 21.47%. The highest yield which defined as the percentage of carbon content relative to the total organics in the yellow liquor is 57.01%. Our results show that the process could be a universal and effective to other wastewater from the traditional pulping processes.

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