| 摘要 |
PCT No. PCT/SE85/00493 Sec. 371 Date Jun. 19, 1986 Sec. 102(e) Date Jun. 19, 1986 PCT Filed Nov. 28, 1985 PCT Pub. No. WO86/03514 PCT Pub. Date Jun. 19, 1986.In the production of ethanol by continuous fermentation in a fermentor (4) with continuous stillage recirculation (19, 20) to the fermentor, the fermentation liquid (6) continuously withdrawn from the fermentor is first sieved in a straining step (7) for separation of coarse solid particles. Then the fermentation liquid (11) is separated in a yeast separation step (12), from which a yeast stream (13) is recirculated to the fermentor (4) and a yeast-free stream (14) is fed to a primary distillation step (9). From the bottom stream (16) from the distillation step (9) a part (19, 20) is recirculated to the fermentor and another part is subjected to final stripping in a secondary distillation step (10). By installing a further centrifugal separation step (22) in the stream (14), which is fed to the distillation step (9), or in the bottom stream (16) which leaves the distillation step (9), finer inert solid particles can be removed from the circulation circuit comprising the distillation step ( 9) and the fermentor (4). Thereby a considerable saving of separator capacity in the yeast separation step (12) and an improved fluidity in the system can be achieved.
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