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Methods for extracting hemicellulose from a cellulosic material

a cellulosic material and hemicellulose technology, applied in the field of extracting hemicellulose from cellulose containing materials, can solve the problems of incompatible with certain industrial uses, high cost of such pulps, and inability to commercially obtain dmdo, and achieve the effect of reducing hemicellulose wood pulp and less hemicellulos

Inactive Publication Date: 2014-02-20
CELANESE INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a process for treating a cellulosic material to reduce its amount of hemicellulose and produce a cellulosic product with less hemicellulose. The process involves extracting hemicellulose from the cellulosic material using an extractant comprising an ionic liquid and acetic acid, separating the extracted hemicellulose from the cellulosic material, and treating the cellulosic material with an enzyme to hydrolyze the hemicellulose. The cellulosic product formed has a reduced amount of hemicellulose and retains its cellulosic fiber morphology. The invention also provides a high purity α-cellulose grade pulp product with reduced hemicellulose content.

Problems solved by technology

Acetate-grade pulps are specialty raw materials produced in commercial pulp processes, but the cost for such pulps is high.
However, paper grade pulp also contains a high amount of impurities, such as hemicellulose, rendering it incompatible with certain industrial uses, such as making acetate flake or tow.
However, DMDO is not commercially available due to its instability.
Therefore, it is not an ideal solvent for producing large quantities of high α-cellulose pulp.
However, in order to turn cellulose containing materials into glucose, the methods disclosed in these references result in breaking down the cellulose molecules, making them unsuitable for use as starting materials to make cellulose derivatives.
This method results in the complete dissolution of the cellulose and destruction of the fiber morphology of the cellulose.

Method used

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  • Methods for extracting hemicellulose from a cellulosic material
  • Methods for extracting hemicellulose from a cellulosic material

Examples

Experimental program
Comparison scheme
Effect test

example 1

Extraction With 1-Ethyl-3-Methylimidazoliumacetate (EMIM Ac) / Acetic Acid Extractant Binary System at 120° C.

[0066]0.8 gram of paper grade pulp sample was weighed and put into a 50 ml glass vial with Teflon face lined cap. A pre-calculated amount of EMIM Ac and Acetic Acid (total) were added into the glass vial according to the predetermined extractant weight ratio (EMIM Ac / Acetic Acid) and mixed well with the pulp samples. The sample thus contained a solid / liquid ratio (S / L) of 5%. The glass vials with pulp and extractant solution were placed into a NAPCO® Autoclave (Model 800-DSE autoclave), and the autoclave was set at 120° C. for 1 hr. After the autoclave treatment, the glass vial was left to cool to room temperature.

[0067]The content in the glass vial was transferred to a 50 ml filtration tube (0.45 um pore size filter from Grace) and centrifuged at 6000 rpm for 5 to 10 min with Thermo Fisher MR 23i Centrifuge. 1 micron or 5 micron Dutch wire cloth filter pads were used to repla...

example 2

Extraction With 1-Ethyl-3-Methylimidazoliumacetate (EMIM Ac) / Acetic Acid Extractant Binary System at 95° C.

[0071]Example 2 was prepared using the same process as Example 1, except that the extraction was performed at 95° C. The UV / Vis absorbance is shown in Table 2.

TABLE 3UV / Vis Absorbance at 95° C. for 1 hourEMIM Ac %Acetic Acid %Absorbance @ 277 nmComparative 2—4.7674261.7975251.5175.524.51.4276241.3976.523.51.4277231.3377.522.51.3078221.36Comparative 1—0.93

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Abstract

A method for treating a cellulosic material comprises extracting the cellulosic material with an extractant to selectively extract hemicellulose therein and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulose-containing material. The extractant comprises an ionic liquid and a non-solvent comprising acetic acid. The cellulosic product retains the cellulosic fiber morphology.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a non-provisional of U.S. Provisional Application 61 / 684,993, filed Aug. 20, 2012, the entirety of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to the extraction of hemicellulose from cellulose containing materials. In particular, the present invention relates to processes for extracting hemicellulose from cellulose containing materials using an extractant comprising acetic acid.BACKGROUND OF THE INVENTION[0003]Cellulose is typically obtained from wood pulp and cotton and may be further modified to create other derivatives including cellulose ethers, cellulose esters and cellulose nitrate, among others. Cellulose derivatives have a variety of commercial uses. For example, cellulose acetate is the acetate ester of cellulose and is used for a variety of products, including textiles (e.g., linings, blouses, dresses, wedding and party attire, home furnishings, draperies, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21C3/04
CPCD21C3/04C08B1/00C08B37/14D21C5/00D21C11/0007C08B37/0057C08H8/00Y02P20/54D21C3/20D21C3/003
Inventor LI, RONGFUMEHTA, JAYTU, XIAOYANBANSAL, PRABUDDHACOMBS, MICHAELFALLON, DENISKIZER, LAWTON E.
Owner CELANESE INT CORP
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