US2014174680A1PendingUtilityA1

Pulping processes

54
Individually held — no corporate assignee on recordPriority: Aug 30, 2011Filed: Aug 30, 2012Published: Jun 26, 2014
Est. expiryAug 30, 2031(~5.1 yrs left)· nominal 20-yr term from priority
Inventors:Brent A. HawkinsFred E. Martin
D21C 9/14D21C 3/02D21C 3/003D21C 5/00D21C 3/222D21H 17/74
54
PatentIndex Score
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Claims

Abstract

A pulping process comprises using a high concentration of anthraquinone (AQ). The pulping process is capable of providing a pulp having low Kappa number with unexpectedly high strength. The pulping process can use wood or non-wood fibers (e.g., bagasse and corn stover) to provide pulp having good papermaking quality. The method for pulping a fiber comprising cooking a first mixture comprising the fibers, water, an alkali, and a delignification selectivity enhancing chemical for a cooking time and at a cooking condition sufficient to form a first pulp having a desired Kappa number of about 15 or less, and strength parameters that are sufficient for papermaking, where the starting material prior to cooking has a Kappa number of 60 or greater.

Claims

exact text as granted — not AI-modified
1 . A method for pulping a fiber comprising:
 providing a first mixture comprising the reaction products of:
 a fiber from a non-wood fiber source, 
 water, 
 anthraquinone, or derivative thereof, having concentration of about 0.1% by weight or greater of the dry fiber, and 
 an alkali, 
 wherein the first mixture has a liquid to dry fiber ratio from about 4 to about 10, and an initial Kappa number of about 60 or greater; and 
   reacting the first mixture for a cooking time and at a cooking condition sufficient to form a second mixture having a Kappa number of about 15 or less, a tensile of at least about 5.50 km, and/or a burst index of at least about 3.00 kPa·m 2 /g.   
     
     
         2 . The method of  claim 1 , wherein the first mixture comprises the reaction products of about 0.2% by weight or greater of anthraquinone or derivative thereof. 
     
     
         3 . The method of  claim 1 , wherein the cooking condition and cooking time provides an H-factor of about 200 or higher. 
     
     
         4 . The method of  claim 3 , wherein the H-factor is about 300 or higher. 
     
     
         5 . The method of  claim 3 , wherein the H-factor is about 400 or higher. 
     
     
         6 . The method of  claim 3 , wherein the H-factor is about 1000 or higher. 
     
     
         7 . The method of  claim 1 , wherein the second mixture has a Kappa number of about 10 or less. 
     
     
         8 . The method of  claim 1 , wherein the second mixture has a Kappa number of about 5 or less. 
     
     
         9 . The method of  claim 1 , wherein the non-wood fiber source comprises agricultural renewable fiber. 
     
     
         10 . The method of  claim 9 , wherein the agricultural renewable fiber comprises bagasse or corn stover. 
     
     
         11 . The method of  claim 8 , further comprising the step of bleaching the second mixture to form a third mixture having an ISO brightness of about 80% or higher. 
     
     
         12 . The method of  claim 11 , wherein the step of bleaching comprises a chlorine free bleaching or elemental chlorine free bleaching. 
     
     
         13 . The method of  claim 12 , wherein the third mixture has an ISO brightness of about 88% or higher. 
     
     
         14 . The method of  claim 13 , wherein the third mixture has an ISO brightness of about 90% or higher. 
     
     
         15 . A pulp composition made according to the method of  claim 11 . 
     
     
         16 . A pulp composition made according to the method of  claim 1 . 
     
     
         17 . A method for pulping a fiber comprising:
 providing a first mixture comprising the reaction products of:
 a fiber from a wood fiber source, 
 water, 
 anthraquinone or derivative thereof, having a concentration of about 0.1% by weight or greater of the dry fiber, and 
 an alkali, 
 wherein the first mixture has a liquid to dry fiber ratio from about 4 to about 10, and an initial Kappa number of about 60 or greater; and 
   reacting the first mixture for a cooking time and at a cooking condition sufficient to form a second mixture having a Kappa number of about 15 or less, a tensile of at least about 5.50 km, and/or a burst index of at least about 3.00 kPa·m 2 /g.   
     
     
         18 . The method of  claim 17 , wherein the anthraquinone concentration is 0.2% by weight or greater of the dry fiber. 
     
     
         19 . The method of  claim 17 , wherein the cooking time and the cooking condition provides an H-factor of about 2000 or higher for the cooking reaction. 
     
     
         20 . The method of  claim 17 , wherein the second mixture has a Kappa number of about 10 or less. 
     
     
         21 . The method of  claim 17 , wherein the second mixture has a Kappa number of about 5 or less. 
     
     
         22 . The method of  claim 21 , further comprising the step of bleaching the second mixture to a third mixture having ISO brightness of about 80% or higher. 
     
     
         23 . The method of  claim 22 , wherein the step of bleaching comprises a chlorine free bleaching or elemental chlorine free bleaching. 
     
     
         24 . The method of  claim 23 , wherein the third mixture has an ISO brightness of about 88% or higher. 
     
     
         25 . The method of  claim 24 , wherein the third mixture has an ISO brightness of about 90% or higher. 
     
     
         26 . A pulp composition made according to the method of  claim 22 . 
     
     
         27 . A pulp composition made according to the method of  claim 23 .

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