Patent ID: 9399836
Filing Date: 2016-07-26
CPC Classification: C07C,C07G,C08H,C10G,C13K,D21C,Y02P

Claim Text:
1. A method for selective removal of at least a portion of detrimental metals and their anions from a detrimental species-containing cellulosic biomass solids comprising: a. providing a first portion of cellulosic biomass solids being contacted by a first dispersed or semi-continuous liquid phase and first continuous gas phase at a temperature in the range of about 0° C. to about 60° C. in a first contact zone wherein the liquid phase comprises base solution having a pH of greater than 9 wherein the flux of the first liquid phase is at least 1 kg/(m b. providing said first dispersed or semi-continuous liquid phase treated cellulosic biomass solids being contacted by a second dispersed or semi-continuous liquid phase and second continuous gas phase at a temperature in the range of about 0° C. to about 60° C. in a second contact zone wherein the liquid phase comprises an aqueous solution having a pH of at most 8 wherein the flux of the second liquid phase is at least 1 kg/(m c. removing the first dispersed or semi-continuous liquid phase from the first contact zone as a basic effluent; d. recovering the second dispersed or semi-continuous liquid phase from the second contact zone as aqueous effluent; e. recycling at least a portion of the aqueous effluent as a portion of the liquid phase in the first contact zone; f. transferring at least a portion of said second dispersed or semi-continuous liquid phase treated cellulosic biomass solids to a digestion and/or reaction zone.