Nanolignocellulose compositions and processes to produce these compositions

a technology of nanolignocellulose and compositions, applied in the field of nanocellulose, can solve the problems of large fibril diameter and length distribution, high energy consumption, and damage to fibers and particles

Inactive Publication Date: 2018-10-18
GRANBIO INTELLECTUAL PROPERTY HOLDINGS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process may be simple, disadvantages include high energy consumption, damage to fibers and particles due to intense mechanical treatment, and a broad distribution in fibril diameter and length.

Method used

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  • Nanolignocellulose compositions and processes to produce these compositions
  • Nanolignocellulose compositions and processes to produce these compositions
  • Nanolignocellulose compositions and processes to produce these compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

cellulose Produced from Softwood

[0264]Softwood (pine) chips are processed in a pilot steam gun digester at a temperature of 185° C. and 20 minutes, resulting in a pulp yield of about 80%. The pulp is passed through a pilot plant disk refiner to defiberize the cooked chips to about 100 freeness. The freeness of pulp gives a measure of the rate at which a dilute suspension of pulp may be drained (see TAPPI T221 “Drainage Time of Pulp”). The pulp is then passed through a lab-scale homogenizer three times for a target of 80-85% fines, to produce unwashed nanolignocellulose. The percentage of fines (refined material) can be increased with more homogenizer passes. The unwashed nanolignocellulose is washed with water three times at 60° C. for 30 min at about 2, 1, and 1 kg water per kg pulp, to produce washed nanolignocellulose.

[0265]FIG. 2 shows an optical micrograph at 40× magnification of the washed nanolignocellulose produced in this example.

[0266]The nanolignocellulose in this example...

example 2

cellulose Produced from Hardwood

[0269]Hardwood chips are processed in a pilot steam gun digester at a temperature temperature of 185° C. and 15 minutes, resulting in a pulp yield of about 80%. The pulp is passed through a pilot plant disk refiner to defiberize the cooked chips to about 100 freeness. The pulp is then passed through a lab-scale homogenizer three times for a target of 80-85% fines, to produce unwashed nanolignocellulose. The percentage of fines (refined material) can be increased with more homogenizer passes. The unwashed nanolignocellulose is washed with water three times at 60° C. for 30 min at about 2, 1, and 1 kg water per kg pulp, to produce washed nanolignocellulose.

[0270]FIG. 3 shows an optical micrograph at 40× magnification of the washed nanolignocellulose produced in this example.

[0271]The pulp produced in this example is also passed through the homogenizer 7 times, resulting in 92% fines. This is compared to bleached softwood Kraft pulp, Masuko refined, 14 p...

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Abstract

Some variations provide a new nanolignocellulose composition comprising, on a bone-dry, ash-free, and acetyl-free basis, from 35 wt % to 80 wt % cellulose nanofibrils, cellulose microfibrils, or a combination thereof, from 15 wt % to 45 wt % lignin, and from 5 wt % to 20 wt % hemicelluloses. The hemicelluloses may contain xylan or mannan as the major component. Novel properties arise from the hemicellulose content that is intermediate between high hemicellulose content of raw biomass and low hemicellulose content of conventional nanocellulose. The nanolignocellulose composition is hydrophobic due to the presence of lignin. Processes for making and using the nanolignocellulose compositions are also described.

Description

PRIORITY DATA[0001]This patent application is a Continuation-in-Part application of U.S. patent application Ser. No. 15 / 278,800, filed on Sep. 28, 2016, which is a non-provisional patent application of U.S. Provisional Patent App. No. 62 / 235,052, filed on Sep. 30, 2015, each of which is incorporated by reference herein.FIELD[0002]The present invention generally relates to nanocellulose and related materials produced by fractionating lignocellulosic biomass and further processing the cellulose fraction.BACKGROUND[0003]Biomass refining (or biorefining) has become more prevalent in industry. Cellulose fibers and sugars, hemicellulose sugars, lignin, syngas, and derivatives of these intermediates are being utilized for chemical and fuel production. Indeed, we now are observing the commercialization of integrated biorefineries that are capable of processing incoming biomass much the same as petroleum refineries now process crude oil. Underutilized lignocellulosic biomass feedstocks have ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08B15/08C09K8/10D21C1/02C09K8/64C09K8/68C13K1/02D21B1/06D21C3/00C08H8/00C09K8/34D21C3/06C07G1/00C08B37/00D21H11/18D21C11/00D21C9/00D21C5/00D21C9/10
CPCC09K8/10D21C1/02C09K8/64C09K8/68C13K1/02D21B1/061D21C3/003D21C3/006C08H8/00C09K8/34D21C3/06C07G1/00C08B15/08C08B37/0057D21H11/18D21C11/0007D21C9/007D21C5/005D21C9/10C12P19/02C12P19/14C12P7/10Y02E50/10
Inventor NELSON, KIMBERLYRETSINA, THEODORA
Owner GRANBIO INTELLECTUAL PROPERTY HOLDINGS LLC
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