Bacterial fermentation production of L-lactic acid

Currently the most advanced production technology is made from corn and other cereals as a carbon source, using bacterial fermentation Production of L-lactic acid. Most also uses the domestic Ethyl lactate oryzae fermentation method, using starch as the carbon source, with the Neutralizing agents such as calcium carbonate control of the fermentation the pH value, and then neutralized with sulfuric acid, a large amount of sulfuric acid Precipitation of calcium, making the process complicated and brought a lot of impurities and contamination, the product purity decreases.Rhizopus oryzae fermentation is aerobic fermentation, high energy consumption, the conversion rate of only 80%. A company with an anaerobic Fermentation, fermentation liquid ferrous lactate hydroxide control the pH value, the use of membrane separation technology with serum fine single tank
Bacteria continuous fermentation process to produce L-lactic acid coupling, with corn as a carbon source, with the wet process sugar Liquid, micro-filtered fermentation broth after mycelium, clear film, general mention electrodialysis, and then the bipolar Membrane electrodialysis, and finally distilled under high vacuum to give pure L-lactic acid, an optical purity ≥ 96%, transfer
Rate of ≥ 95%, extraction yield of ≥ 90%, simple technology, investment is not high, low energy consumption, no waste Slag waste water discharge, cost about 7,500 yuan per ton.