Adsorbents for the recovery of catalyst from block co-polymer process and method for regenerating of the same

摘要

Provided is a process for isolating a catalyst from a solution having a copolymer and a catalyst dissolved therein, after performing copolymerization with the catalyst. More specifically the invention provides selection and application of an adsorbent to be used for the isolation.

主权项

1. A process for recovering the catalyst from a solution of copolymer and catalyst dissolved therein by using silica having average pore size of not less than 5 nm, pore volume of 0.75-3.3 cm3/g and production rate of propionaldehyde not more than 0.0035%, and regenerating the silica, which comprises the steps of:
1) contacting a solution having copolymer and catalyst dissolved therein, which was formed after copolymerization of carbon dioxide and epoxide by using a complex containing onium salt as a catalyst, with silica that is not soluble in the solution to result in isolation of the catalyst by means of adsorption of the catalyst on the surface of silica; and 2) treating the silica with catalyst adsorbed thereon with acid to desorb the catalyst from the surface of silica and to regenerate silanol group of silica.