System and method for repulping of paper products and improvement of water quality with dipolar solvents and recovery

a technology of dipolar solvents and paper products, applied in the direction of textiles and paper, digesters, raw materials, etc., can solve the problems of large disproportionality on the cellulose chain, carcinogenic, mutogenic and toxic to animal reproduction, etc., and achieve the effects of increasing the hydration power of fibrous materials, reducing the number of ink particles, and increasing the detachment of adhesives, additives and ink particles

Inactive Publication Date: 2010-10-21
SANATA TECH
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Benefits of technology

[0062]In conclusion, the rearrangement of water structure through the hydrogen bonding by a dipolar aprotic solvent will offer the following; weaker hydrogen bonds between water-water molecules and among the small water clusters as well. These characteristics will render

Problems solved by technology

However, if the water molecule was instead near the methyl groups of aprotic solvent no such alternative bonding would be possible.
HEMPT however has the disadvantage that it is considered to be carcinogenic, mutogenic and toxic to reproduction in animals.
Acetone as a repulping solvent has the disadvantage that it bri

Method used

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  • System and method for repulping of paper products and improvement of water quality with dipolar solvents and recovery
  • System and method for repulping of paper products and improvement of water quality with dipolar solvents and recovery
  • System and method for repulping of paper products and improvement of water quality with dipolar solvents and recovery

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Embodiment Construction

[0093]FIG. 1

[0094]Referring to FIG. 1, the formation of a 6-water molecule cluster is illustrated with the dipolar aprotic solvent dimethylsulfoxide shown in the upper left comprised of oxygen atom 103, sulfur atom 104 and two methane (CH3) molecules, 100 and 102. The dimethylsulfoxide forms hydrogen bonds with the water at 101 and 105. These bonds prevent other water molecules from bonding with the water molecules in the same place, thereby reducing the size of the water cluster. The 6-water cluster is defined by a ring of oxygen atoms 111, 112, 113, 114, 115, and 116 and hydrogen atoms such as 106 and 107 which are connected to oxygen atoms 114 and 115 respectively with hydrogen bonds represented by single lines 108 and 109 respectively. The molecules in the 6-water cluster may be connected to other water molecules or other molecule clusters by any number of branching hydrogen bonds.

[0095]FIG. 2A

[0096]Referring to FIG. 2A, the effect of a dipolar aprotic solvent on the H—O—H angle...

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Abstract

An enhanced method of repulping paper and improving water quality by placing used paper product material in an aqueous solution of dipolar aprotic protophylic solvent, processing it, and recovering recycled pulp based on two physical reactions of the dipolar solvent: first with water from one part of the solvent, and second with cellulosic material from the other part of the solvent. The water reaction involves a rearrangement of hydrogen bonds within the water, improving its reactivity and solvent capacity, and the cellulosic reaction involves dissolution of hemicellulose in a manner which results in reduced fibre loss and improved pulp quality. The net result is more efficient pulping and reduced environmental impact.

Description

FIELD OF THE INVENTION[0001]This invention relates to the treatment of water and the repulping of paper products.BACKGROUND OF THE INVENTION[0002]In the pulp manufacturing industry water is used extensively and is a vital element of the process of repulping paper. It is used for dissolving pulp, and as a component in loading, sizing, and coloring ingredients as well as in the transportation of pulp fibres through the manufacturing process as it moves through storage tanks, screens, refiners and paper-making machines.[0003]The current process of repulping paper involves pulping, screening, cleaning, and de-inking by processes like bleaching and the application of alkaline chemicals which contaminate the water. Waste paper treatment methods are variable depending on the type of paper and may involve de-inking of toner from laser printers or photocopiers, or the removal of other contaminants from the paper.[0004]Pollution sometimes causes water molecules to form large clusters which su...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21C7/00D21C7/12
CPCD21C3/20D21C5/02Y02W30/64
Inventor AWADEL-KARIM, SALAH
Owner SANATA TECH
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