| 摘要 |
PCT No. PCT/SU86/00050 Sec. 371 Date Jan. 22, 1988 Sec. 102(e) Date Jan. 22, 1988 PCT Filed May 29, 1986 PCT Pub. No. WO87/07174 PCT Pub. Date Dec. 3, 1987.The mass-transfer apparatus comprises a case (1), accommodating at least one horizontal perforated tray (6) and a froth retainer (7). The froth retainer (7) is mounted directly on the tray (6) and is made in the form of a grid composed of vertical bars (8). The vertical bars (8) make up cells (9), interconnected with each other. Lower portions of the bars (8) of the froth retainer (7), contiguous with the tray (6), are made solid, whereas the cells (9) of the grid communicate with one another through perforations made in the upper portions of the bars (8) of the froth retainer (7).
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