Never mind about the TiCl4 question. Just re-read the original post.
What solvent is it in? Could you vac off the iPrOH as it forms, or use a methoxide or such to increase the volatility? Again, my concern is that ligand exchange may be unavoidable, but I am not an expert on transition metal catalysis.
Furthermore, I'm pretty sure you can get Ti(III) citrate. Is Ti(IV) citrate available? Might be a more innocuous ligand.