Method for reducing and /or avoiding the build-up of wood components

Abstract

The invention relates to a method for avoiding and/or reducing the deposition of volatile and non-volatile wood components in gas-bearing systems, whereby at least one of the volatile wood components, at least partly, condenses in the gas-bearing system and the gas contains at least one compound with a similar condensation profile to the volatile wood component and which at least reduces the deposition of volatile wood components or the reaction products thereof. The invention further relates to a method for reducing and/or avoiding the deposition of wood components on machines and/or equipment components for the production of wood fiber materials from wood chippings, in which the shredding of the wood is achieved in the presence of a compound which forms a film on the surfaces of the above machines and/or equipment components and at least reduces the deposition of volatile wood components and/or the reaction products thereof.

1 . A process for avoiding and/or reducing deposits of volatile and non-volatile wood constituents in gas-bearing systems, wherein volatile wood constituents undergo at least partial condensation in the gas-bearing systems, characterized in that the gas contains at least one compound which 
 has condensation characteristics similar to those of said volatile wood constituents, and    at least reduces deposits of volatile wood constituents and/or reaction products thereof.    
     
     
         2 . The process according to  claim 1 , characterized in that said compound is a dicarboxylic ester.  
     
     
         3 . The process according to  claim 2 , characterized in that said dicarboxylic ester is a di-n-alkyl adipate and/or a diisoalkyl adipate.  
     
     
         4 . The process according to  claim 2 , characterized in that said dicarboxylic ester is dibutyl adipate.  
     
     
         5 . The process according to any of  claims 1  to  4 , characterized in that the gas-bearing system is part of: 
 a wood processing plant, particularly a plant for producing wood fiber material and/or wood fiber boards,  
 a plant for producing cellulose,  
 a cellulose-processing plant,  
 a paper or cardboard production plant, and/or  
 a plant for producing components or articles made of molded fiber.  
 
     
     
         6 . The process according to any of  claims 1  to  5 , characterized in that the gas includes steam.  
     
     
         7 . A process for reducing and/or avoiding deposits of wood constituents on machines and/or plant components used in the production of wood fiber materials from wood chips, characterized in that wood is defiberized in the presence of at least one compound which: 
 forms a film on the surfaces of the machines and/or plant components, and    at least reduces deposits of volatile wood constituents and/or reaction products thereof.    
     
     
         8 . The process according to  claim 7 , characterized in that said compound is a dicarboxylic ester.  
     
     
         9 . The process according to  claim 8 , characterized in that said dicarboxylic ester is a di-n-alkyl adipate and/or a diisoalkyl adipate.  
     
     
         10 . The process according to  claim 8 , characterized in that said dicarboxylic ester is dibutyl adipate.  
     
     
         11 . The process according to any of  claims 7  to  10 , characterized in that the machines and/or plant components used in the production of wood fiber materials from wood chips include at least one refiner.  
     
     
         12 . The process according to  claim 11 , characterized in that the dicarboxylic ester is metered into the first refiner together with the clear filtrate.  
     
     
         13 . The process according to  claim 11  or  12 , characterized in that the concentration of dicarboxylic ester is 100-5000 ppm, preferably 200-2000 ppm, and more preferably 300-1000 ppm.  
     
     
         14 . The process according to any of  claims 7  to  13 , characterized in that the machines and/or plant components are components of a plant used in the production of thermomechanical pulp.