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Thinning wood and other low specific wood used for leiser pomace

A technology of pulp and content, applied in the direction of pulping with inorganic alkali, synthetic cellulose/non-cellulose material pulp/paper, pulp bleaching, etc., can solve the problem of unutilized

Inactive Publication Date: 2004-08-04
WEYERHAEUSER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of these by-products are not utilized

Method used

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  • Thinning wood and other low specific wood used for leiser pomace
  • Thinning wood and other low specific wood used for leiser pomace

Examples

Experimental program
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Embodiment 1

[0059] A commercial continuous extension lignification process is simulated in the laboratory using a specially constructed reactor vessel with associated auxiliary equipment including circulation pumps, batteries and direct heat exchangers. The temperature of the reactor was controlled by indirect heating and continuous circulation of cooking liquor. A standard amount of wood without equivalent moisture content was charged to the reactor vessel. An atmospheric pre-steaming step may optionally be performed prior to cooking. The cooking liquor and dilution water are then added to the digester to achieve the target liquor / wood ratio, wherein the cooking liquor is added in an amount of about 50% to 80% of the total cooking liquor. The reactor is then brought to the impregnation temperature and pressure and held for the target time. After the steeping process, about 5% to 15% of the total amount of cooking liquor is then added to the reactor vessel. The reactor was then brought...

Embodiment 2

[0062] Pulping Process Parameters for Low Specific Gravity Wood

[0063] A primary cook for low specific gravity wood chips has the following parameters.

[0064] Wood chips S.G.

Embodiment 3

[0066] Bleaching of low specific gravity wood

[0067] The pulp produced by the method of Example 2 was bleached according to the following procedure.

[0068] Phase O

[0069] Inwoods low specific gravity wood chips were pulped to form alkaline kraft pulp (TAPPI standard T236 cm-85 with a viscosity of 239 cP (TAPPI T230)) with a kappa number of 16.8. Brownstock pulp is treated with oxygen in a pressure vessel with high consistency mixing capabilities. Preheat the vessel to about 120°C. Sodium hydroxide (NaOH) equivalent to 100 pounds per ton of pulp was added to the alkaline pulp. The reaction vessel was then closed and the pressure increased to 60 psig by introducing oxygen into the pressure vessel. Water is present in the container in an amount sufficient to provide a 10% consistency.

[0070] After 45 minutes, agitation was stopped and the pulp was removed from the pressure vessel and washed. The resulting washed pulp had a viscosity of 35.3 cP and a Kappa value of...

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Abstract

The use of low specific gravity wood from thinning operations, for example, will produce a lower brownstock viscosity for a given kappa number target. A differential of 200-cP falling ball pulp viscosity has been detected from Kraft cooks of low and high specific gravity wood. Using low specific gravity wood can reduce the bleach stage temperature and the chemical dose needed in the bleach plant to produce lyocell pulp specifications. Low specific gravity wood also increases the ability to reduce pulp viscosity to very low levels without increasing the copper number of the pulp or the concentration of carbonyl in the pulp above acceptable levels.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application 09 / 842,274, filed April 24, 2001, which is a continuation-in-part of U.S. Patent Application 09 / 574,538, filed May 18, 2000, now U.S. Patent 6,331,354 , which is a continuation-in-part of US Patent Application 09 / 256,197 filed February 24, 1999, now US Patent 6,210,801. All of the above applications are incorporated herein by reference in their entirety. technical field [0003] The present invention relates to pulp for the manufacture of lyocell molded bodies, including films, fibers and non-woven fabrics, and to a process for the manufacture of such pulp for the manufacture of lyocell molded bodies, and from said pulp A lyocell molded body made from meal and a method for producing the lyocell molded body. In particular, the present invention relates to the use of "yond" wood (commonly known as "core wood", "juvenile wood", "low specific gravity woo...

Claims

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Application Information

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IPC IPC(8): D04H1/26C08B1/00D01D5/098D01D5/18D01F2/00D21C3/02D21C9/00D21C9/10D21H11/04D21H13/00
CPCC08B1/00D01F2/00Y10T428/2904D01D5/18Y10T428/29D21C9/004Y10T428/2933D01D5/098Y10T428/2965D21C3/02D21C9/10D21H5/141
Inventor 詹姆士·E·西利二世小W·哈维·佩尔辛格尔肯特·罗巴格罗孟奎
Owner WEYERHAEUSER CO
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