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Found results for
 patents
1.
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METHOD OF PRODUCING PULP USING OXALIC ACID
| Application Number |
US2013042588 |
| Publication Number |
2013/177487 |
| Status |
In Force |
| Filing Date |
2013-05-24 |
| Publication Date |
2013-11-28 |
| Owner |
BIOPULPING INTERNATIONAL, INC. (USA)
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| Inventor |
- Akhtar, Masood
- Horn, Eric, Gene
- Swaney, Ross, Edward
- Cai, Zhiyong
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Abstract
The present disclosure is related to methods of producing pulp from wood using an application of oxalic acid prior to mechanical defibration/refining. In one embodiment, the present invention relates to a method for producing a pulp from wpod feed material wherein an oxalic acid-containing solution either is applied to the wood material just before being fed to the mechanical action zone of the defibrator/refiner, or is co-fed into the defibrator/refiner, where the step of mechanical defibration/refining is performed on the material.
IPC Classes ?
- D21C 3/04 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides
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2.
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METHOD OF MAKING MEDIUM DENSITY FIBERBOARD
| Application Number |
US2007077504 |
| Publication Number |
2008/028183 |
| Status |
In Force |
| Filing Date |
2007-09-04 |
| Publication Date |
2008-03-06 |
| Owner |
- WISCONSIN ALUMNI RESEARCH FOUNDATION (USA)
- BIOPULPING INTERNATIONAL (USA)
- SECRETARY OF AGRICULTURE, THE UNITED STATES OF AMERICA, as represented by the THE USDA FOREST SERVICE (USA)
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| Inventor |
- Akhtar, Masood
- Kenealy, William, R.
- Horn, Eric, G.
- Swaney, Ross, E.
- Winandy, Jerrold
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Abstract
The present invention provides a method for producing an MDF board from pulp from a fibrous lignocellulose material using a treatment or pretreatment step which exposes the material to oxalic acid or oxalic acid derivatives (particularly dialkyl ester derivatives, particularly in the vapor phase). The treated wood is then subjected to a sugar extraction wash and refined using any one of the several pulping methods to produce a final pulp product. Once this is done the pulp is used to make MDF boards having improved water repellency properties.
IPC Classes ?
- B27N 1/00 - Pretreatment of moulding material
- D21C 1/04 - Pretreatment of the finely-divided materials before digesting with acid reacting compounds
- D21C 3/04 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides
- C08J 5/04 - Reinforcing macromolecular compounds with loose or coherent fibrous material
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3.
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METHOD FOR TREATING LIGNOCELLULOSIC MATERIALS
| Application Number |
US2006026565 |
| Publication Number |
2007/008689 |
| Status |
In Force |
| Filing Date |
2006-07-10 |
| Publication Date |
2007-01-18 |
| Owner |
- WISCONSIN ALUMNI RESEARCH FOUNDATION (USA)
- BIOPULPING INTERNATIONAL, INC. (USA)
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| Inventor |
- Akhtar, Masood
- Kenealy, William, Robert
- Horn, Eric
- Swaney, Ross, E.
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Abstract
The present invention is a method for producing a pulp from a fibrous lignocellulose material or source using a treatment or pretreatment step which exposes the material to oxalic acid derivatives, particularly dialkyl ester derivatives, particularly in the vapor phase. Once treated, the material may be refined using any one of the several pulping methods to produce a final pulp product and the production of the product is accompanied by strength increases in paper made from the pulp and energy savings in making the pulp, hi addition the treatment or pretreatment produces a soluble carbohydrate source and other components (e.g. acetic acid, other wood components) for further product development. In certain cases a pulp product is not produced and all of the carbohydrate present in the lignocellulose is converted into soluble sugars.
IPC Classes ?
- D21C 3/04 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides
- D21H 11/16 - Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H 11/20 - Chemically or biochemically modified fibres
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