| 摘要 |
The invention provides a process for the combined production of products selected from the group consisting of lysine and its salts and products selected from the group consisting of at least one weak acid and a salt thereof, which weak acid is selected from the group consisting of organic acids and amino acids produced by a neutral bio-process, the process comprising: (a) acidulating an aqueous feed stream containing the weak acid and ammonium cations with an acidulating acid, which acidulating acid has at least one pKa lower than 4.2, (b) recovering at least part of the weak acid from the aqueous solution formed in step (a), forming thereby an aqueous solution of an ammonium salt comprising ammonium cations resulting from the feed solution in step (a) and anions of the acidulating acid, and (c) fermenting a medium containing at least one carbon source, at least one organic nitrogen source and ammonium salt resulting from step (b), utilizing a lysine producing microorganism, whereby there is formed a fermentation liquor containing at least 50 g/l of lysine values, whereby the fermentation liquor is suitable for use as a source of lysine in animal feed. |
