Process for producing DMC catalysts
AssigneeBayer Aktiengesellschaft
InventorsJörg Hofmann, Bernd Klinksiek, Stephan Ehlers, Thorsten Fechtel, Franz Föhles, Pieter Ooms
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Abstract
The invention relates to an improved method of producing double-metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, in which the DMC catalyst dispersion is produced using a mixing nozzle, preferably a jet disperser. The DMC catalysts produced in this way have an increased activity in polyether polyol production, reduced particle size and narrower particle size distribution.
Claims14
A process for preparing a double-metal cyanide (DMC) catalyst comprising the steps of:
- forming a DMC catalyst dispersion by combining, with a jet disperser,
- at least one solution of at least one water soluble salt of Zn(II), Fe(II), Ni(II), Mn(II), Co(II), Sn(II), Pb(II), Fe(III), Mo(IV), Mo(VI), Al(III), V(V), V(IV), Sr(II), W(IV), W(VI), Cu(II) or Cr(III);
- at least one solution of at least one water-soluble metal cyanide salt or at least one alkali or alkaline-earth metal cyanide acid of Fe(II), Fe(III), Co(II), Co(III), Cr(II), Cr(III), Mn(II), Mn(III), Ir(III), Ni(II), Rh(III), Ru(II), V(IV) or V(V);
- and
- adding at least one organic complexing ligand.
A process for preparing a double-metal cyanide (DMC) catalyst comprising the steps of:
- forming a DMC catalyst dispersion by combining, with a jet disperser,
- at least one solution of at least one water soluble salt of Zn(II), Fe(II), Ni(II), Mn(II), Co(II), Sn(II), Pb(II), Fe(III), Mo(IV), Mo(VI), Al(III), V(V), V(IV), Sr(II), W(IV), W(VI), Cu(II) or Cr(III);
- at least one solution of at least one water-soluble metal cyanide salt or at least one alkali or alkaline-earth metal cyanide acid of Fe(II), Fe(III), Co(II), Co(III), Cr(II), Cr(III), Mn(II), Mn(III), Ir(III), Ni(II), Rh(III), Ru(II), V(IV) or V(V);
- adding at least one organic complexing ligand;
- isolating the DMC catalyst from the dispersion;
- redispersing the DMC catalyst in a solution of aqueous or anhydrous ligand with a jet disperser, wherein the aqueous or anhydrous ligand may be the same as the at least one organic complexing ligand;
- and
- isolating the DMC catalyst from the solution.
Dependencies are inferred from the claim text.