Aromatic sulphonation IV Kinetics and mechanism of the sulphonation of benzene in aqueous sulphuric acid

The kinetics of the sulphonation of benzene have been measured at 5.0°, 25.0° and 45.0° in aqueous sulphuric acid solutions, varying from 77.6 to 99.2 wt-% H2SO4In addition, sulphonation rate measurements have been made at 5.0° in 98.8 wt-% H2SO4containing various concentrations of sodium bisulphate. All reactions were found to be first order with respect to benzene. The kinetics are discussed in terms of the mechanism: It is suggested that sulphur trioxide or, though less probable, the sulphuric acid solvate of sulphur trioxide SO3(H2SO4) or disulphuric acid (H2S2O7), is the sulphonating entity X and thatk1

Keywords:

• Aromatic sulfonation
• Benzene
• Trioxide
• Intramolecular force
• Organic chemistry
• Kinetics
• Deprotonation
• Chemistry
• Inorganic chemistry
• Aqueous solution
• Sulfur

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