Method of extracting, distilling and separating 3-hydroxyl butanone from fermentation liquor by adding salts

The present invention belongs to the technical field of biological engineering, in particular, it discloses a method of extractive distillation Salt from Fermentation broth acetoin. Isolating the salt extractive distillation method of fermentation broth acetoin is added to the fermentation liquid acetoin soluble inorganic salt to be dissolved in the intermittent shock adding a hydrophobic organic solvent, mixing, extraction after collecting the lower phase inorganic salt, an inorganic salt to the organic solvent phase was added again to the second extraction operation is repeated, the collected organic solvent relative to the combined addition of an appropriate amount of anhydrous sodium sulfate, the organic solvent phase was dried to free water, by atmospheric distillation to recover the organic solvent, and acetoin to give a yellow viscous sample. The present invention is simple, low energy consumption, suitable for industrial production and application, in an organic solvent and an inorganic salt during operation can be recycled, not only can save costs and improve resource utilization efficiency, but also with the current environmental protection requirements.