FIELD: sugar production. SUBSTANCE: solution obtained from sugar-beet is subjected to first chromatographic fractionation in circuit operated in simulated liquefied-bed mode to sucrose-rich fraction and fraction enriched with second component or fraction enriched with sucrose and second component. Fraction enriched with second component or sucrose and second component is subjected to second chromatographic fractionation in another circuit to give second sucrose-rich fraction and discrete fraction enriched with second dissolved component. EFFECT: increased yield and/or improved purity of the second isolated component, in particular betaine. 18 cl, 7 tbl, 7 ex
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