Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-I-6Table 1. Parameters in kinetic equation (1) for methanol and ethanol.Alcohol k 1 , l 2 mol –2 min –1 k 2 , l 2 g –1 ct mol –1 min –1 KMethanol 2.82×10 5 exp –60630/RT 4.84×10 5 exp –50180/RT 2,5Ethanol – 3.623×10 5 exp –64956/RT 3,5It was found that the rate of esterification of LA by butanol in the kinetic regime in thebatch reactor and tubular flow reactor obeys the equation of Langmuir-Hinshelwood model:k2CLACAlc− k−2CECWr = β CCt(2)1 + b CWWWhere: k 2 , k -2 – rate constant of esterification and hydrolysis of ester correspondingly;b W – adsorption constant of water; β – diffusion factor.Calculated parameters of equation (2) are listed below:k 2 = (1.45±0.035)×10 3 ⋅exp –(45880±510)/RT , l 2 g –1 ct mol –1 s –1 ;k -2 = (4.60±0.22)×10 2 ⋅exp –(46090±480)/RT , l 2 g –1 ct mol –1 s –1 ;b w = (0.93±0.019)×exp –(11500±230)/RT , l/mol;β is equal to 1 in case of batch reactor (kinetic regime) and 0.22 in case of tubular flowreactor (diffusion regime).ConclusionsThe kinetics of esterification of lactic acid by methanol, ethanol and 1-butanol wasinvestigated in the batch and tubular flow reactors. The kinetic equations which allow todescribe processes adequately were obtained.222