From Chemistry Towards Technology Step-By-Step From Chemistry Towards Technology Step-By-Step От химии к технологии шаг за шагом 2782-1900 81468 10.52957/2782-1900-2024-4-4-89-99 Научные статьи Scientific articles Научные статьи Case study on 4-Isopropyl-ortho-xylene production Case study on 4-Isopropyl-ortho-xylene production Мазурин Олег Анатольевич Mazurin Oleg Anatolievich Шакун Владимир Андреевич Shakun Vladimir Andreevich shakyh@mail.ru

кандидат химических наук;

candidate of chemical sciences;

 Нестерова Татьяна Николаевна Nesterova Tatiana Nikolaevna

кандидат химических наук;

candidate of chemical sciences;

 Востриков Сергей Владимирович Vostrikov Sergey Vladimirovich

кандидат химических наук;

candidate of chemical sciences;

 Курганова Екатерина Анатольевна Kurganova Ekaterina Anatol'evna kurganovaea@ystu.ru Кошель Георгий Николаевич Koshel Georgy Nikolaevich

доктор химических наук;

doctor of chemical sciences;

 https://orcid.org/0000-0002-0491-7452 Фролов Александр Сергеевич Frolov Aleksandr Sergeevich frolovas@ystu.ru

кандидат химических наук;

candidate of chemical sciences;

 Honeywell Process Solutions Москва Россия Honeywell Process Solutions Moscow Russian Federation Самарский государственный технический университет Samara State Technical University Ярославский государственный технический университет Yaroslavl State Technical University 23 12 2023 23 12 2023 4 4 89 99 03 11 2023 29 11 2023 https://chemintech.ru/en/nauka/article/81468/view

We have experimentally studied the alkylation reaction of o-xylene with propylene under kinetic control conditions followed by realkylation under thermodynamic control conditions. The paper provides an analysis of the alkylation reaction products obtained under kinetic control as well as kinetic analysis and thermodynamic analysis of the overalkylation process. The authors have considered the methyl group migration reactions during overalkylation and have given kinetic analyses of these reactions. We found that the optimal method for the preparation of 4 isopropyl-o-xylene is to conduct the process in two stages. The first one is a liquid-phase alkylation of o-xylene under kinetic control at 353 K. The second stage is liquid-phase realkylation of the obtained alkylation reaction mass until reaching thermodynamic equilibrium at a temperature range of 303-353 K under certain conditions. These conditions should ensure minimal migration of methyl groups, i.e. with minimum contact time and alkyl-/aryl- < 0.5 ratio in the reaction products.

We have experimentally studied the alkylation reaction of o-xylene with propylene under kinetic control conditions followed by realkylation under thermodynamic control conditions. The paper provides an analysis of the alkylation reaction products obtained under kinetic control as well as kinetic analysis and thermodynamic analysis of the overalkylation process. The authors have considered the methyl group migration reactions during overalkylation and have given kinetic analyses of these reactions. We found that the optimal method for the preparation of 4 isopropyl-o-xylene is to conduct the process in two stages. The first one is a liquid-phase alkylation of o-xylene under kinetic control at 353 K. The second stage is liquid-phase realkylation of the obtained alkylation reaction mass until reaching thermodynamic equilibrium at a temperature range of 303-353 K under certain conditions. These conditions should ensure minimal migration of methyl groups, i.e. with minimum contact time and alkyl-/aryl- < 0.5 ratio in the reaction products.

 alkylation realkylation propylene sulphocationics o-xylene

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