Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent generated in situ from lignin

A technology of cellulose and biomass, which is applied in the direction of pulping of cellulose raw materials, biofuels, biological raw materials, etc., and can solve problems such as scaling of processing equipment

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

For example, large amounts of lignin can lead to fouling of processing equipment, potentially resulting in costly system downtime

Method used

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  • Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent generated in situ from lignin
  • Methods for digestion of cellulosic biomass solids in the presence of a phenolic solvent generated in situ from lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Example 1: Multicycle reaction using water digestion medium.

[0103] 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 thre...

Embodiment 2

[0105] Example 2: Multicycle reaction with water / isopropanol digestion medium.

[0106] 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

[0107] Example 3: Single cycle reaction with water / ethanol digestion medium.

[0108] 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 in a digestion medium comprising water and an organic solvent; 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 and liberating lignin, the lignin forming a phenolics liquid phase partitioned from the digestion medium and at least a portion of the slurry catalyst accumulating in the phenolics liquid phase; removing at least a portion of the phenolics liquid phase and accumulated slurry catalyst from the digestion unit; converting at least a portion of the phenolics liquid phase into a phenolic solvent; and returning at least a portion of the phenolic solvent and the slurry catalyst to the digestion unit.

Description

[0001] This application claims the benefit of US Patent Application No. 61 / 783,985, filed March 14, 2013, the contents of which are hereby incorporated by reference in their 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 include...

Claims

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Application Information

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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
OwnerSHELL INT RES MAATSCHAPPIJ BV