Introduction The alkoxylation reactions are generally performed in semibatch reactors,[1] also in series, in which the catalyst and the substrate （alkyl phenols, fatty alcohols or acids）are initially charged while e...Introduction The alkoxylation reactions are generally performed in semibatch reactors,[1] also in series, in which the catalyst and the substrate （alkyl phenols, fatty alcohols or acids）are initially charged while epoxide （ethylene or propylene oxide） is added during the reaction course. This particular synthesis strategy is due to the high reactivity of alkoxides展开更多
This paper reports the results of monopropoxylation and monoethoxylation of ethylhexyl alcohol performed in the presence of KOH and a DMC type catalyst, respectively. The existing differences are discussed in terms of...This paper reports the results of monopropoxylation and monoethoxylation of ethylhexyl alcohol performed in the presence of KOH and a DMC type catalyst, respectively. The existing differences are discussed in terms of kinetic performance of the syntheses, as well as the obtained products＇ compositions. The investigated DMC type catalyst showed 60 to 70 times as high conversion rates, narrower homolog distributions and higher selectivity, in comparison with KOH. Interpretation of the experimental results was performed using kinetic parameters of the WeibulI-Nycander-Gold model and the Natta Mantica relationships. In spite of any differences between the reactivity of the investigated catalysts and alkylene oxides, a significant contribution ofpolymerisation parallel to the target polyaddition was determined, absorbing a major part of the converted adducts, both in the presence of DMC and KOH.展开更多
文摘Introduction The alkoxylation reactions are generally performed in semibatch reactors,[1] also in series, in which the catalyst and the substrate （alkyl phenols, fatty alcohols or acids）are initially charged while epoxide （ethylene or propylene oxide） is added during the reaction course. This particular synthesis strategy is due to the high reactivity of alkoxides
文摘This paper reports the results of monopropoxylation and monoethoxylation of ethylhexyl alcohol performed in the presence of KOH and a DMC type catalyst, respectively. The existing differences are discussed in terms of kinetic performance of the syntheses, as well as the obtained products＇ compositions. The investigated DMC type catalyst showed 60 to 70 times as high conversion rates, narrower homolog distributions and higher selectivity, in comparison with KOH. Interpretation of the experimental results was performed using kinetic parameters of the WeibulI-Nycander-Gold model and the Natta Mantica relationships. In spite of any differences between the reactivity of the investigated catalysts and alkylene oxides, a significant contribution ofpolymerisation parallel to the target polyaddition was determined, absorbing a major part of the converted adducts, both in the presence of DMC and KOH.
