PCT No. PCT/DK94/00256 Sec. 371 Date Dec. 1, 1995 Sec. 102(e) Date Dec. 1, 1995 PCT Filed Jun. 23, 1994 PCT Pub. No. WO95/01989 PCT Pub. Date Jan. 19, 1995The present invention relates to a method of separating a protein, in particular an enzyme, from an aqueous solution of proteins, comprising (a) providing an aqueous mixture of proteins with a salt concentration at or below 1.5 Molar, to which a water soluble polymer has been added, and (b) recovery of the protein on crystalline form.