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.
维普
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