FIELD: biotechnology.
SUBSTANCE: invention relates to biotechnological industry. Method for producing a chemical product produced from a microorganism (microorganisms) using continuous fermentation of cellulose-containing biomass-derived sugar liquid. Method comprises filtering a culture liquid through a separation membrane, retaining unfiltered liquid in, or refluxing unfiltered liquid to, the culture liquid (s), adding a fermentation feedstock to the culture liquid, and recovering a chemical product. Microorganism(s) is/are a microorganism(s) that undergo(es) catabolite repression. Ratio between the pentose and the hexose contained in the sugar liquid is 1:9 to 9:1. Concentration of said pentose in the total amount of the filtrate is not more than 5 g/L, wherein said pentose is xylose.
EFFECT: invention provides high output of chemical substance.
5 cl, 35 tbl, 37 ex
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