BIOMASS TREATMENT FOR HYDROTHERMAL HYDROCATALYTIC CONVERSION

摘要

A selective removal of metal and its anion species that are detrimental to subsequent hydrothermal hydrocatalytic conversion from the biomass feed prior to carrying out catalytic hydrogenation/hydrogenolysis/hydrodeoxygenation of the biomass in a manner that does not reduce the effectiveness of the hydrothermal hydrocatalytic treatment while minimizing the amount of water used in the process is provided.

主权项

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 acid solution having a pH of at most 4 wherein the flux of the first liquid phase is at least 1 kg/(m2s); 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 least 5 wherein the flux of the second liquid phase is at least 1 kg/(m2s); c. removing the first dispersed or semi-continuous liquid phase from the first contact zone as an acidic 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.