After separation of the undissolved PA 6, the dissolved PA 6 in the CEW was recovered by adding H 2 O as an antisolvent (AS). The mass ratio of added antisolvent was fixed to m AS m CEW = 2.35. After addition of the antisolvent, the dissolved PA 6 precipitated from CEW and the amorphous agglomerates gradually solidified. During the solidification the precipitated PA 6 was cut into small pieces (≤ 2 mm 3 ), then placed on a weighted filter paper and washed with 1000 ml H 2 O on a vacuum filtration setup. The filter paper with the precipitated PA 6 (rPA) was dried at 40 • C over night and weighed (m F+rPA ) to determine the yield according to equation 2: