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A method for preparing cellulose fraction from lignocellulosic materials

IP.com Disclosure Number: IPCOM000243521D
Publication Date: 2015-Sep-29

Publishing Venue

The IP.com Prior Art Database

Related People

Novozymes A/S: OWNER [+2]

Abstract

The application discloses a method for preparing cellulose fraction starting from lignocellulosic materials. The lignocellulosic materials are treated with cell wall degrading enzymes until the cellulose is released from the cell wall materials where after the cellulose is dissolved in a cold alkaline solution. The solution is separated from the insoluble plant remains and the cellulose fibers are regenerated by reducing the pH of the solution. The obtained cellulose fibers can be spun into yarns, which again can be converted into textiles or fabrics using know procedures.

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A method for preparing cellulose fraction from lignocellulosic materials

FIELD OF THE INVENTION

The invention discloses a method for purifying cellulose fibers from lignocellulosic material using an enzymatic extraction and purification process. The purified cellulose fiber material is activat- ed, dissolved and regenerated into yarns using a wet-spinning process as known in the art, and

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the yarns may subsequently be converted into textiles using techniques known in the art. Thus, the invention provides a method for preparing yarns and textiles using any lignocellulosic mate- rials as starting point. The invention further provides yarns and textile prepared using the in- ventive method.

BACKGROUND OF THE INVENTION

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Textiles may be prepared from several natural or synthetic fibers.

One class of textiles are prepared from regenerated natural fibers i.e. the fibers consists of natu- ral fibers that have been partly or completely dissolved and subsequently regenerated into the fibers used for preparing the textiles.

A well-known process for preparing textiles from regenerated fibers is the viscose process,

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which has been practiced industrially for more than 50 years. The viscose process is based on chemically dissolution of cellulose fibers from wood using sodium hydroxide and carbon disul- fide followed by wet spinning for regeneration of the fibers. The process has the disadvantage that it produces significant amounts of both gaseous and aqueous pollutants that are environ- mentally problematic or that need to be handled in order to protect the environment. 20

Thus there is a desire to provide alternative methods for producing yarns and textiles using sus- tainable starting materials such as lignocellulosic materials, which process produces less pollu- tant.

SUMMARY OF THE INVENTION

The invention relates to a method for purifying cellulose from lignocellulosic material comprising

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the steps of:

a. Providing lignocellulosic material;

b. Degrading the lignocellulosic material using one or more cell wall degrading en- zymes;


c. Dissolving the cellulose in alkaline solvent;

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d. Separating the solution comprising cellulose from the solid;

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e. Reducing the pH of the solution until the cellulose precipitates; and f. Recovering the cellulose by separating the precipitated cellulose fraction from the solution.

     In a preferred embodiment the cellulose fraction is further treated with an endoglu- canase in order to activate, swell and dissolve and reduce crystallinity.

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     The cellulose may be spun into yarns and subsequent made into fabrics and textiles using well known techniques.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 shows schematic drawing disclosing washing, enzymatic extraction and cleaning of cellulose.

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Figure 2 shows enzymatic swelling and simultaneous measurement of viscosity.

Figure 3 shows a microscopy picture of the insoluble lignin phase cf. example 3.

Figure 4 shows a microscopy picture of precipitate...