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In view of problems of low conversion and low productivity in preparation of benzoquinone by the oxidation of aniline, a leaching process with a shear-enhancement approach was adopted to investigate the effects of adding amount of pyrolusite, acidity, shear rate, and liquid-solid ratio on the conversion rate of p-benzoquinone. It is found that high-speed shearing can accelerate the homogenization of pyrolusite and aniline, and enhance the oxidation reaction, resulting in efficient conversion of aniline. Under optimized process conditions, including acidity of 90 g/L, shear rate of 2 500 r/min, liquid-solid ratio of 5∶1, pyrolusite addition at 1.6 times theoretical amount, the conversion rate of p-benzoquinone is 91.23%. Compared to traditional mechanical stirring process, the reaction time can be significantly shortened and the conversion rate of p-benzoquinone can be significantly increased. It is concluded that the leaching process with shear-enhancement approach can have a promising future in industrial application.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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