Study of the synthesis of dimethyldichlorosilane from methyl chloride and silicon. / Estudo da síntese de dimetildiclorosilano a partir de cloreto de metila e silício.

AUTOR(ES)

João Guilherme Rocha Poço

DATA DE PUBLICAÇÃO

2001

RESUMO

Some important aspects of dimethyldichlorosilane direct synthesis from methyl chloride and both chemical grade silicon and high purity silicon (99.999%) catalyzed by copper and promoters in a fluidized bed reactor was studied. The effects of temperature on the activation process and on the reaction were studied to obtain an estimate of the apparent activation energy for each process step. The influence of average particle diameter of silicon and of catalyst and the effect of Ca, Al and Fe additions in the catalyst system were also evaluated. A discussion about the so-called isokinetic compensation behavior which is observed in the direct synthesis is presented. The proposed explanation about the origin of this phenomena is based on the anisotropic character of the reaction. A complementary explanation about the mechanism of promoters action was also proposed. The obtained values of apparent activation energies are within the range reported in the literature. Selectivity and activity showed some variation with both catalyst and silicon particle sizes. This behavior was explained in terms of silicon particle coverage by the catalyst system. The performance parameters show better correlation with the geometric area measured by laser diffraction than with the BET area obtained by N2 adsorption. The promoters Ca, Fe and Al have shown effect over the reaction, however these effects were more proeminent if they are originally present in silicon structure.

ASSUNTO(S)

methylchlorosilane metilclorosilanos silicone monomer dimethyldichlorosilane efeito de compensação reações entre silício e cloreto de metila methyl chloride and silicon methylchlorosilane synthesis trimethylchlorosilane direct synthesis síntese direta isokimectic compensation effect methyltrichlorosilane dimetildiclorosilano rochow process processo rochow

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