Deoiling enjoys great significance in recycling and landfill of spent hydrotreating (HDT) catalyst. In this study, a novel approach for oil removal from spent HDT catalyst with assistance of ultrasound was developed. The effects of variables on oil removal were investigated by response surface methodology and central composite design method. The oil removal efficiency reaches 96.03 ± 0.82% under the optimum conditions of liquid-solid ratio 16.00 ml·g −1 , 75 °C, sodium hydroxide dosage 3.88 wt%, and 40 kHz ultrasonic irradiation for 3.25 h. Under the optimum conditions, the contact angle of spent catalyst is 98.7° before oil removal, and then reduces to 57.2° after deoiling with the help of ultrasound, but turns to 72° after deoiling in the absence of ultrasound, which further verifies that the oil removal efficiency can be improved by ultrasound. Compared to traditional extraction or hydrothermal methods for removing oil from spent catalyst, the proposed approach introduced ultrasonic force field to enhance oil removal efficiency without adding organic solvent or surfactant.
Xinran Li,Fengli Chen,Shuangyang Li,Jun Jia,Huiyan Gu,Lei Yang
Flavonols and anthocyanins were successfully extracted from blackcurrant marc by using homogenate–microwave-assisted extraction (H-MAE). Factors affecting the extraction were investigated and optimized according to the yields of flavonols and anthocyanins. The adopted experimental conditions were: ethanol volume fraction, 60%; homogenate time, 3 min; liquid-solid ratio, 28.3 mL/g; antioxidant, 0.3% tert -butylhydroquinone; pH 2.5; microwave irradiation power, 551 W; microwave irradiation time, 16.4 min. Satisfactory yields of flavonols (2323.3 μg/g) and anthocyanins (473.7 μg/g) were obtained with relatively short extraction time under optimum conditions compared with conventional extraction techniques. This study illustrates an emerging method for the extraction of natural products from raw plant materials.
危险品化学品经营许可证（带存储）