A process to delignify biomass, said process comprising the steps of:



providing a vessel;
providing biomass comprising lignin, hemicellulose and cellulose fibers into said vessel;
providing a aqueous acidic composition comprising a sulfuric acid component;
providing a peroxide component;
exposing said biomass to said sulfuric acid component and peroxide component, creating a reaction mass;
allowing said sulfuric acid component and peroxide component to come into contact with said biomass for a period of time sufficient to a delignification reaction to occur and remove over 90 wt % of said lignin and hemicellulose from said biomass; and
controlling the temperature of the delignification reaction to maintain it below 55° C.