Treatment of Pulp Stocks Using Oxidative Enzymes to Reduce Pitch Deposition

a technology of oxidative enzymes and pulp stocks, which is applied in the direction of pulp liquor regeneration, cellulose treatment using microorganisms/enzymes, microorganism/enzyme addition, etc., can solve the problems of reducing paper quality, negative affecting the physical properties of pulp, and increasing manufacturing costs, so as to reduce energy requirements, improve paper strength, and reduce apparent pitch content
US20070261806A1Inactive Publication Date: 2007-11-15ENZYMATIC DEINKING TECH LLC
7 Cites 24 Cited by

Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
ENZYMATIC DEINKING TECH LLC
Publication Date
2007-11-15
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

Methods of treating pulp stocks with an enzyme formulation containing one or more oxidative enzymes, to reduce pitch deposition, control pitch related problems, modify the physical and / or chemical properties of tri, di-, and mono-glycerides, fatty acids, resin acids, esters of fatty acids and resin acids, and metal soaps of fatty acids and resin acids, or change the concentration of triglycerides, fatty acids, resin acids, and esters of fatty acids and resin acids, have been developed. The pulp stock is treated with an enzyme formulation containing laccases, peroxidases, esterases, and / or combinations thereof. The enzyme formulations may also contain a laccase mediator and / or a dispersant. The enzyme formulation can be applied at any of several locations during the pulping and / or papermaking process. The enzyme formulation is typically applied as a solution to the pulp stock. The enzyme treatment is effective at a temperature of between about 30° C. to about 95° C., more preferably from about 50° C. to about 80° C. The pH of the pulp stock is from about 4.0 to about 7.0, more preferably from about 4.5 to 5.5. The stock can be treated for a period of time ranging from about 5 minutes to about 10 hours.
Need to check novelty before this filing date? Find Prior Art

Description

FIELD OF THE INVENTION

[0001] The present invention is generally in the field of treating pulp stocks with enzyme formulations in order to reduce pitch deposition. BACKGROUND OF THE INVENTION

[0002] Wood resin is composed of fatty acids and resin acids, triglycerides, steryl esters, and sterols. Wood resins, as well as other extractives such as lignans, pectins, and phenols, are the major components of pitch deposits. During mechanical pulping, the encapsulated resin is liberated from ray parenchyma, cells and resin canals. Some of the dispersed resin droplets precipitate onto fiber surfaces impairing fiber to fiber bonding and thereby negatively affect the physical properties of the pulp. Dispersed resin which precipitates later in the pulping and papermaking processes can affect machine runnability and reduce paper quality which can result in increased manufacturing costs.

[0003] Traditionally, pitch deposits in pulping and paper manufacturing have been reduced by debarking and se...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More