US2007227945A1PendingUtilityA1

System and a method for extracting wax from pulp fibers and paper products

41
Individually held — no corporate assignee on recordPriority: Mar 30, 2006Filed: Mar 30, 2006Published: Oct 4, 2007
Est. expiryMar 30, 2026(expired)· nominal 20-yr term from priority
Inventors:Roger O. Campbell
C10G 73/06Y02W30/64D21C 5/02
41
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Claims

Abstract

A system and a method for extracting wax from pulp fibers an-d/or paper products are provided. The system and method may implement a continuous extraction vessel that can have one or more extraction stages. A single or multi-staged continuous extractor would provide solvent flow which counters the cellulosic materials within the vessel so that the solvent becomes more concentrated with the dissolved wax. This will reduce the volume of solvent necessary to achieve the same extraction efficiency and reduce the energy necessary to remove the solvent from the wax. In another embodiment, the temperature of the solvent can be increased by operating the extractor under a pressure greater than atmospheric pressure.

Claims

exact text as granted — not AI-modified
1 . A system for performing an extraction of wax from secondary fiber comprising: 
 an extractor;    a supply of secondary fiber delivered to the extractor; and    a supply of solvent delivered to the extractor wherein wax contained within the secondary fiber is soluble in the solvent;    wherein a pressure within the extractor is greater than atmospheric pressure and sufficient to raise a temperature of the solvent beyond the boiling point of the solvent.    
     
     
         2 . The system of  claim 1  wherein the extractor is a continuous extractor.  
     
     
         3 . The system of  claim 1  wherein a time period for the extraction is in a range from about 5 minutes to about 30 minutes.  
     
     
         4 . The system of  claim 1  wherein the solvent is hexane.  
     
     
         5 . The system of  claim 1  further comprising: 
 a system for separating the wax from the solvent.    
     
     
         6 . The system of  claim 1  further comprising: 
 a system for drying the secondary fiber after the extraction.    
     
     
         7 . The system of  claim 1  wherein the temperature of the solvent is greater than 50 degrees Celsius.  
     
     
         8 . A method for performing an extraction of wax from secondary fiber, the method comprising the steps of: 
 supplying the secondary fiber to an extractor wherein the secondary fiber contains wax; and    supplying solvent to the extractor wherein the wax contained within the secondary fiber is soluble in the solvent;    wherein a pressure within the extractor is greater than atmospheric pressure and sufficient to raise a temperature of the solvent beyond the boiling point of the solvent.    
     
     
         9 . The method of  claim 8  further comprising the step of: 
 separating the solvent from the wax.    
     
     
         10 . The method of  claim 9  further comprising the step of: 
 recycling the solvent to the extractor.    
     
     
         11 . The method of  claim 8  further comprising the step of: 
 drying the secondary fiber after the extraction.    
     
     
         12 . The method of  claim 11  further comprising the step of: 
 re-pulping the secondary fiber.    
     
     
         13 . The method of  claim 8  wherein the solvent is hexane.  
     
     
         14 . The method of  claim 8  wherein the temperature of the solvent is greater than 50 degrees Celsius.  
     
     
         15 . The method of  claim 8  wherein the extraction occurs in a range from about 5 minutes to about 30 minutes.  
     
     
         16 . The method of  claim 8  wherein the secondary fiber is pre-heated before the extraction.

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