Alkylation of p-cresol with tert-butyl alcohol using benign Bronsted acidic ionic liquid catalyst

• Published in: Journal of Molecular Catalysis A: Chemical (ISSN: 1381-1169), vol. 321, num. 1-2, p. 34-41
• Elsevier, 2010

Novel and environmentally benign Bronsted acidic ionic liqs. with SO3-H functionality were prepd. using N-methylimidazole, pyridine, triethylamine and 1,4-butanesultone as the source chems. The prepd. ionic liq. catalysts were characterized by NMR and their catalytic activity in tert-butylation of p-cresol with tert-Bu alc. was investigated. The effects of reaction time, reaction temp., reactant mole ratio and the recyclability of the catalysts on the conversion of p-cresol and selectivity to 2-tert-butyl-p-cresol and 2,6-di-tert-butyl-p-cresol called butylated hydroxytoluene (BHT) were investigated. Lower alc. to p-cresol mole ratios, lower ionic liq. to p-cresol ratio and temps. as low as 70°C gave 80% conversion of p-cresol. The catalyst activity was found to be almost completely retained even after 5 recycles. The extended Arrhenius equation was used to calc. the rate consts. for this reaction.

Keywords: Ionic liquids ; p-Cresol ; Butylated hydroxytoluene ; tert-Butylation ; tert-Butyl alcohol ; Selective Alkylation ; Molecular-Sieves ; Exchange Resins ; T-Butylation ; Phenol ; Butanol ; Chloroaluminate ; Esterification ; Temperature ; Efficient

Reference

• EPFL-ARTICLE-161663
• doi:10.1016/j.molcata.2010.01.016
• View record in Web of Science

Record created on 2010-12-15, modified on 2017-05-12