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Efficient Separation of Ethyl Benzene and Xylenes Using Distillation and Crystallization

This study focuses on the separation of a mixture containing ethyl benzene (20% wt), m-xylene (40% wt), o-xylene (20% wt), and p-xylene (20% wt) into pure products. Utilizing case-based reasoning and relative volatility classifications, methods are proposed for effective separation. The first step involves distilling o-xylene and ethyl benzene. Due to low relative volatilities, m-xylene and p-xylene are subsequently separated using crystallization or molecular sieve adsorption. This approach highlights the potential of systematic separation sequences in chemical engineering.

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Efficient Separation of Ethyl Benzene and Xylenes Using Distillation and Crystallization

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  1. STATEMENT: “Example 4.1. Separate a mixture of ethyl benzene (20 %wt), m-xylene (40 %wt), o-xylene (20 %wt) and p-xylene (20 %wt) to pure products.” Pajula, E., Seuranen, T. and Hurme, M., ”Selection of separation sequences by case-based reasoning”, Computer-Aided Chemical Engineering, Vol. 9, 469-474 (2001)

  2. Pajula, E., Seuranen, T. and Hurme, M., ”Selection of separation sequences by case-based reasoning”, Computer-Aided Chemical Engineering, Vol. 9, 469-474 (2001) “According to CES, first o-xylene and then ethyl benzene are separated by distillation. For m-xylene/pxylene separation the available a is too small for ordinary distillation..” “The separations are classified in the database based on relative volatility values as easy (a>=1.2), possible, where mass separating agent (MSA) could be useful (1.1< a <1.2) and difficult (a =<1.1) separations.” “Based on the search results two feasible methods are proposed for further research: First separate o-xylene and then ethyl benzene by distillation. After this separate remaining p- and m-xylenes either by crystallization or molecular sieve adsorption since these methods were found to be potential in the case-base search.”

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