(58b) Purification of Styrene from the Styrene/Ethylbenzene Mixture with a Small Amount of the Mixed Xylene By Stripping Crystallization
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2018
- Proceeding: 2018 Spring Meeting and 14th Global Congress on Process Safety
- Group: Global Congress on Process Safety
Monday, April 23, 2018 - 5:12pm-5:18pm
SC is introduced in this work to purify styrene (ST) from the multi-component system consisting of ST, ethylbenzene (EB), p-xylene (PX), m-xylene (MX) and o-xylene (OX). Styrene is one of the most important aromatic compounds and is used extensively in the manufacture of polystyrene. Due to the close boiling points of ST, EB, PX, MX and OX, it is rather complicated and energy-intensive to separate them by conventional distillation. A thermodynamic model is developed to determine the three-phase equilibrium conditions and direct the SC experiments. The experiments show that SC can be effectively applied to purify ST from the mixture. However, as EB is more easily incorporated into the ST crystal lattice compared to PX, MX and OX, it becomes more difficult to further purify ST for a higher concentration of EB in the mixture.
- Shiau, L. D., Wen, C. C. and Lin, B. S. âSeparation and purification of p-xylene from the mixture of m-xylene and p-xylene by distillative freezingâ, Ind. Eng. Chem. Res, 44(7), p2258-2265, 2005.
- Shiau, L. D., Wen, C. C. and Lin, B. S. âSeparation of p-xylene from the multicomponent xylene system by stripping crystallizationâ, AIChE Journal, 54(1), p337-342, 2008.
- Shiau, L. D.; Liu, K. F. âInvestigations into the effects of the cooling rate on stripping crystallizationâ, Ind. Eng. Chem. Res, 52, p1716-1722, 2013.