Summary
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1.
The intermolecular methyl group redistribution of xylenes in the presence of aluminosilicate catalyst has been studied.
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2.
The effect of various factors on the process has been studied, and it has been established that under optimum conditions (temperature, 450°C; pressure, 15 atm; and raw material feed rate, 0.5 h−1) the yield of trimethylbenzenes based on crude passed through mounted to 22.4–23.3%; among them were mesitylene, 5.6–5.8%; pseudocumene, 15.7–16.3%; and hemimellitene, 1.1–1.2%. The selectivity of the reaction for disproportionation attains 86%.
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3.
It has been shown that distillation of a mixture of trimethylbenzenes in a 40–50 theoretical plate column at a reflux ratio of 25∶1 to 30∶1 allows isolation of 96–97% pure pseudocumene and approximately 90% pure mesitylene.
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Literature cited
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 10–13, June, 1966.
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Aliev, S.M., Ismailov, R.G., Mamedaliev, G.M. et al. Preparation of trimethylbenzenes. Chem Technol Fuels Oils 2, 377–380 (1966). https://doi.org/10.1007/BF00731573
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DOI: https://doi.org/10.1007/BF00731573