Patent ID: 7008485

Claim:
A process of separating compounds with a small molar mass from compounds having a molar mass higher than but less than 1.9 times that of the compounds with a small molar mass, comprising providing a starting solution comprising compounds with a small molar mass and compounds with a molar mass higher than but less than 1.9 times that of the compounds with a small molar mass, subjecting said solution to nanofiltration to obtain a fraction enriched in compounds with a small molar mass and a fraction enriched in compounds with a molar mass higher than but less than 1.9 times that of the compounds with a small molar mass, recovering the fraction enriched in compounds with a small molar mass, and optionally recovering the fraction enriched in compounds with a molar mass higher than but less than 1.9 times that of the compounds with a small molar mass.