Processing Technique for Pyrolusite Leaching with Aniline by Shear Enhancement Approach
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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维普
