FIELD: chemistry.
SUBSTANCE: method for depolymerisation of polysaccharides of galactomannan, as well as xanthan, type, preferably galactomannans, to specified molecular weight by high-energy electron beam treatment. Preferential galactomannans for the said type of treatment are guar gum, guar endosperm and hydroxypropylguar. According to preferential version of the method, guar gum is depolymerised, preferably, to molecular weight of ca. 100000 daltons to ca. 200000 daltons.
EFFECT: depolymerised guar has lower polydispersity and can be used for oil well fracturing in order to gain in oil yield.
16 cl, 15 tbl, 6 dwg
