| 摘要 |
PCT No. PCT/EP87/00125 Sec. 371 Date Nov. 6, 1987 Sec. 102(e) Date Nov. 6, 1987 PCT Filed Mar. 3, 1987 PCT Pub. No. WO87/05322 PCT Pub. Date Sep. 11, 1987.Biocatalyst particles of a predetermined size are retained in a liquid mixture by oscillating in a vertical direction a screen having openings with a passage width greater than the size of the biocatalyst particles. Preferably the screen is substantially cylindrical having an interior that encloses a liquid column in a container which may be substantially cylindrical. Gas may be introduced into the liquid column and mixing means can be used to create flow currents on either or both sides of the screen. The mixing means may be a plurality of perforated discs connecting the screen to a centric gas delivery pipe in the column. Oscillating of the screen may be at a frequency between 10 and 100 Hertz and an amplitude between 0.5 to 50 times the biocatalyst particle size. Changing the frequency and amplitude varies retaining action of the screen. |
