Ptt Global Chemical Public Company Limited

Nuttha Thongchul

Phatthanon Prasitchoke

Vasana Tolieng

This invention relates to a process for producing lactic acid or its salts that can be performed easily, reduce complicated steps, and provide high lactic acid yield and high productivity, wherein said process comprising of the following steps: (a) cultivating thermotolerancegenus bacteria to obtain a seed culture; (b) increasing cell number of bacteria by inoculating the seed culture contained from step (a) into a fermenter containing an initial carbon source under an aerobic condition; (c) fermenting the seed culture obtained from step (b) in the fermenter under a microaerobic condition to obtain lactic acid or its salts; wherein the step (b) comprising at least one addition of the carbon source under any one of the following conditions, where are independent to each other, to increase a concentration of the carbon source: when the concentration of the carbon source in the fermenter reduces to 50 % or less comparing to the initial concentration.

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Bangkok, Thailand

Nuttha Thongchul