Study of the kinetics of fumaric acid crystallization by batch cooling / Estudo da cinética de cristalização do ácido fumárico em batelada por resfriamento

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This work aimed to define the kinetics parameters in laboratory scale. The fumaric acid batch cooling crystallization was studied. The equipment consists of a stirred tank crystallizer, equipped with a cooling and temperature control system (LabMax - METTLER Toledo). Experiments without seeds were done with linear and optimized cooling. The results were used to obtain the kinetics parameters from the final size distribution. Considering the exponent of mass concentration as zero (c = 0), results on the exponents for nucleation (n = 5,88), growth (g = 3,81) and the system constant (BBN = 1,85.10 in SI units) were obtained. When these values were used to calculate the mean crystal size, an average deviation of 5,5 % and a maximum of 15,3 % was found -13 A comparison of the crystal size distribution results for experiments done with demineralized and treated water was conducted. Despite the crystals, which were formed with treated water, showed agglomeration, the CSD was not affected considerably by the solvent impurities. Comparing the crystals obtained in laboratory scale with crystals obtained in industrial scale, a greater agglomeration was observed in the second case. Some suggestions to improve the industrial process were made regarding the results obtained

ASSUNTO(S)

ácido fumárico crystallization cooling cinética fumaric acid engenharia quimica cristalização resfriamento kinetic desenvolvimento e otimização de processos industriais

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