Ethylene to para -Xylene :: News :: ChemistryViews

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Ethylene to para-Xylene

As the price of oil goes up and supplies dwindle, alternative feedstocks becomeincreasingly important for servicing the chemical industry. Ethylene, commonly released fromoil industrially, can also be generated from biomass via bioethanol. A team at the Universityof North Carolina at Chapel Hill, USA, have demonstrated that ethylene can act as a useful

feedstock in the preparation of an important commodity chemical, p-xylene (pictured). Thischemical is one of the highest volume chemicals derived from petroleum. It is used togenerate the dimethyl ester of terephthalic acid for copolymerization with ethylene glycol toproduce 11 billion tonnes of polyethylene terephthalate (PET) annually.

p-Xylene is one of the products of catalytic reforming of various crude oil streams. However, the team has shown how ethylene, as the solefeedstock, can be trimerized to hexane and thence to 2,4-hexadiene. A Diels-Alder reaction with another ethylene molecule then forms 3,6-

dimethylcyclohexene. p-Xylene can then be produced from this intermediate without isomeric side-products through catalytic dehydrogenation,the team explains.

Synthesis of p-Xylene from Ethylene,Thomas W. Lyons, Damien Guironnet, Michael Findlater, Maurice Brookhart,J. Am. Chem. Soc. 2012.DOI: 10.1021/ja307612b

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Author: David Bradley

Published: 16 September 2012

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