Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent

A cellulosic and biomass technology, which can be used in pulping of cellulosic raw materials, biofuels, biomaterials, etc., and can solve problems such as reducing energy efficiency and parking.

Inactive Publication Date: 2015-11-04
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If not removed or otherwise treated, these catalyst poisons may interfere with the catalytic reduction reactions used to stabilize soluble carbohydrates, causing process shutdowns for catalyst regeneration and / or replacement, and lower overall energy efficiency

Method used

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  • Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent
  • Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent
  • Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Example 1: Multicycle reaction using water digestion medium.

[0119]A 75 mL Parr 5000 reactor was charged with 20 g of deionized water, 0.3 g of sodium carbonate buffer, and 0.504 g of sulfided nickel oxide-promoted cobalt molybdate catalyst (DC-2534, Criterion Catalyst & Technologies L.P., containing 1-10% oxide Cobalt oxide and molybdenum trioxide on aluminum (up to 30 wt%), and less than 2% nickel). The catalyst was previously sulfided as described in US Patent Application Publication 2010 / 0236988, which is hereby incorporated by reference in its entirety. 2.7 g of southern pine wood chips (39% water, nominal dimensions 3 mm x 5 mm x 5 mm) were added and the reactor was pressurized with 52 bar of hydrogen under magnetic stirring. Afterwards, the reactor was heated to 240°C for 5 hours. Three cycles of wood addition and heating under hydrogen were added, with additional sodium carbonate buffer added between cycles as needed to maintain a pH of 5-7. After the three...

Embodiment 2

[0121] Example 2: Multicycle reaction with water / isopropanol digestion medium.

[0122] Example 1 was repeated using a digestion medium comprising 50% isopropanol / 50% deionized water. The percent digestion increased to 88%, and the GC selectivity increased to 90%.

Embodiment 3

[0123] Example 3: Single cycle reaction with water / ethanol digestion medium.

[0124] Example 1 was repeated for a single cycle using digestion media comprising 50% ethanol / 50% deionized water. In this example, 0.12 g of sodium carbonate buffer was used. Heated at 190°C for 1 hour, then at 250°C for 2 hours. The percent digestion was 82%, and the GC selectivity was 78%.

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Abstract

Digestion of cellulosic biomass solids can be enhanced in the presence of a phenolic solvent. Methods for digesting cellulosic biomass solids can comprise providing cellulosic biomass solids containing up to about 50% water by mass in a digestion medium comprising about 50% or more of an organic solvent by volume; heating the cellulosic biomass solids and the digestion medium in a digestion unit in the presence of molecular hydrogen and a slurry catalyst capable of activating molecular hydrogen, thereby forming an alcoholic component derived from the cellulosic biomass solids and liberating lignin therefrom; wherein the digestion medium and the water form a biphasic mixture in which the alcoholic component, slurry catalyst, and lignin are contained; removing at least a portion of the biphasic mixture from the digestion unit; converting at least a portion of the lignin into a phenolic solvent; and returning the phenolic solvent to the digestion unit.

Description

[0001] This application claims the benefit of pending US Provisional Patent Application No. 61 / 784,283, filed March 14, 2013, which is hereby incorporated by reference in its entirety. technical field [0002] The present disclosure relates generally to digestion of cellulosic biomass solids, and more particularly to methods of digesting cellulosic biomass solids in the presence of a phenolic solvent. Background technique [0003] A variety of substances of commercial importance can be produced from natural resources, including biomass. Cellulosic biomass may be particularly advantageous in this regard due to the variety of abundant carbohydrates found therein in various forms. As used herein, the term "cellulosic biomass" refers to living or recently living biological material comprising cellulose. Lignocellulosic material found in the cell walls of higher plants is the world's largest source of carbohydrates. Materials commonly produced from cellulosic biomass may includ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): D21C3/20C10G1/06C10G1/08C10G3/00C12P7/10D21C3/22D21C7/14D21C11/00
CPCC08B1/003D21C3/20D21C3/222D21C7/14D21C11/0007Y02E50/16Y02P30/20Y02E50/10
InventorJ·B·鲍威尔K·A·约翰逊
OwnerSHELL INT RES MAATSCHAPPIJ BV