METHOD OF ISOLATION OF POLYHYDROXYAIKANOATES (PHAS) FROM BIOMASS FERMENTED BY MICROORGANISMS PRODUCING POLYHYDROXYAIKANOATES (PHAS) AND/OR FROM BIOMASS CONTAINING AT LEAST ONE CROP-PLANT PRODUCING POLYHYDROXYAIKANOATES

摘要

The invention relates to a method of isolation of polyhydroxyalkanoates from biomass containing polyhydroxyalkanoates comprising the steps of extracting components of the biomass other than polyhydroxyalkanoates from the biomass by means of an extraction agent based on alkyl alcohol having 2 to 4 carbon atoms in the chain, separating the extract containing these components from the extraction solution thus obtained, removing the remainder of the extraction agent from the solid phase by distillation with an aqueous solution or by stripping with water vapour or by drying, extracting from the solid phase thus pre-cleaned polyhydroxyalkanoates by an extraction agent based on chlorinated hydrocarbon, separating the polyhydroxyalkanoates from the extraction solution thus obtained, and feeding this extract to a circulation loop in order to obtain a polyhydroxyalkanoates precipitate.