Patent ID: 8362299

Claim:
A process for the purification of an impure phase comprising a target product, water and at least one impurity differing from the target product and from water, comprising: a) crystallizing said target product and said water out of said impure phase to form a suspension comprising a mother liquor and crystals, wherein said crystallization is effected at a temperature T 1 in the range of T e −15° C.≦T 1 ≦T e +3° C.; b) separating at least part of said crystals from said mother liquor; c) melting said at least a part of said crystals forming a melt, wherein said melt is effected at a temperature T 2 in the range of T 1 <T 2 ≦T 1 +10° C.; and d) recycling at least a part of said melt to step b), wherein said non-recycled part of the melt is purified.