Process for removing and regenerating a double metal cyanide (DMC) catalyst from a polymer polyol
AssigneeBASF SE
InventorsWerner Hinz, Edward Michael Dexheimer
Life of this patent
Estimating the term…
Abstract
A method of removing and reclaiming a double metal cyanide (DMC) catalyst from a polyol is disclosed. A polymeric acid that is soluble in the polyol is introduced into the polyol during or after the polymerization reaction. The polymeric acid reacts with the double metal cyanide catalyst thereby causing the double metal cyanide catalyst and the polymeric acid to form an agglomeration in the polyol. The agglomeration is easily separated from the polyol via filtration, for example. The recovered agglomerated DMC catalyst can then be reconstituted using an acid solution.
Claims40
A method comprising the steps of:
- forming a polyol in the presence of a double metal cyanide catalyst;
- adding a soluble polymeric acid to said polyol;
- reacting said polymeric acid with said double metal cyanide catalyst to form an agglomeration;
- and
- removing said agglomeration from said polyol.
A method comprising the steps of:
- forming a polyol in the presence of a double metal cyanide catalyst;
- adding a soluble polymeric amine to said polyol;
- reacting said polymeric amine with said double metal cyanide catalyst to form an agglomeration;
- and
- removing said agglomeration from said polyol.
A method comprising the steps of:
- forming a polyol in the presence of a multi metal cyanide catalyst;
- adding an adsorbent having at least two reactive sites capable of protonating the polyol;
- protonating the polyol thereby separating the multi metal cyanide catalyst from said polyol;
- forming an agglomeration of said multi metal cyanide catalyst and said adsorbent;
- and
- separating said agglomeration from said polyol.
A method comprising the steps of:
- forming a polyol in the presence of a double metal cyanide catalyst;
- adding a soluble polymeric acid to said polyol;
- reacting said polymeric acid with said double metal cyanide catalyst to form an agglomeration;
- removing said agglomeration from said polyol;
- and
- regenerating the double metal cyanide catalyst.
Dependencies are inferred from the claim text.