Research on Ultrasonic Enhanced Separation of Ethyl benzene,Crystals from C8 Aromatic Hydrocarbons
By changing the power of ultrasonic waves,the effects of different power ultrasonic waves on the morphology and dynamic behavior of C8 aromatic isomers were studied.The research results indicate that introducing 40W and 20 kHz ultrasonic waves into the C8 aromatics crystallization and separation process can not only avoid crystal nucleation,but also transform the formed crystal morphology into smaller and more regular spherical particles,making it difficult to encapsulate the mother liquor,thereby improving the separation efficiency of ethylbenzene components in C8 aromatics and reducing the moisture content of xylene crystals to 2％;At the same time,the required cooling capacity for crystallization separation is significantly reduced,increasing the initial crystallization temperature of the mixed C8 aromatic materials from-47.2℃ to-8.9℃,and increasing the purity of the ethylbenzene mother liquor after crystallization separation of xylene crystals to 99.0％,thereby achieving single-stage efficient and continuous crystallization separation of ethylbenzene,generating high concentration and high-purity ethylbenzene that can directly enter the styrene unit.
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