Method and composition for detackifying organic contaminants in the process of pulping and papermaking

Abstract

The present invention discloses a method for detackifying organic contaminants in the process of pulping and papermaking and a composition used for the same. Specifically, the invention discloses that the water circulation system of pulping and papermaking process can be provided with non-ionic cellulose ether and cationic coagulant in lower amount, through which, the de position of organic contaminants can be inhibited under the synergistic action of pre-coagulation and detackification.

1 . A method for detackifying organic contaminants in the process of pulping and papermaking comprising adding an effective dose of non-ionic cellulose ether and cationic coagulant into a papermaking pulp. 
     
     
         2 . The method according to  claim 1 , characterized in that the non-ionic cellulose ether is selected from the group consisting of hydroxyethyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, hydroxybutyl methyl cellulose, hydroxybutyl cellulose and their combination. 
     
     
         3 . The method according to  claim 1 , characterized in that molecular weight of the non-ionic cellulose ether is in the range from 10,000 to 1,000,000, and molar degree of substitution of the non-ionic cellulose ether is in the range from 0.01 to 3.0. 
     
     
         4 . The method according to  claim 1 , wherein the molecular weight of the non-ionic cellulose ether is in the range from 50,000 to 500,000, and molar degree of substitution of the non-ionic cellulose ether is in the range from 0.5 to 2.8. 
     
     
         5 . The method according to  claim 1 , wherein the molecular weight of the non-ionic cellulose ether is in the range from 80,000 to 250,000, and molar degree of substitution of the non-ionic cellulose ether is in the range from 1.5 to 2.5. 
     
     
         6 . The method according to  claim 1 , wherein the cationic coagulant is an inorganic coagulant chosen from aluminum sulfate, aluminum chloride, ferric sulfate, ferric chloride, polyaluminum sulfate, polyaluminum chloride, aluminum chlorohydrate, polyaluminum sulfate chloride, polyaluminum silicate chloride, polyferric chloride, polyferric sulfate, polyferric sulfate chloride, polyferric silicate chloride, and their combination. 
     
     
         7 . The method according to  claim 1 , wherein the cationic coagulant is an organic cationic coagulant chosen from linear or crosslinked copolymer of epihalohydrin and aliphatic amine, poly (diallyl dimethyl ammonium chloride), copolymer and terpolymer containing cationic monomer of tertiary amino carboxylate, diallyl dimethyl ammonium chloride or vinylamine, melamine-formaldehyde resin, cationic starch, chitosan, cationic guar gum, and their combination. 
     
     
         8 . The method according to  claim 1 , wherein the proportion by weight of non-ionic cellulose ether to cationic coagulant in the composition is 1:0.1-1:100. 
     
     
         9 . The method according to  claim 8 , wherein the proportion by weight of non-ionic cellulose ether to cationic coagulant in the composition is 1:0.5-1:20. 
     
     
         10 . The method according to  claim 9 , wherein the proportion by weight of non-ionic cellulose ether to cationic coagulant in the composition is 1:1-1:10. 
     
     
         11 . The method according to  claim 1 , wherein the pulp comprises recycled pulp, coated broke, deinked pulp, mechanical pulp, high-yield pulp, or the combination thereof. 
     
     
         12 . The method according to  claim 1 , wherein the organic contaminants are pitch and/or stickies produced in the process of pulping and papermaking. 
     
     
         13 . A composition used for detackifying organic contaminants in the process of pulping or papermaking comprising non-ionic cellulose ether and cationic coagulant. 
     
     
         14 . The composition according to  claim 13 , wherein the non-ionic cellulose ether is chosen from hydroxyethyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, hydroxybutyl methyl cellulose, hydroxybutyl cellulose and their combination. 
     
     
         15 . The composition according to  claim 13  wherein the molecular weight of the non-ionic cellulose ether is in the range from 10,000 to 1,000,000, and molar degree of substitution of the non-ionic cellulose ether is in the range from 0.01 to 3.0. 
     
     
         16 . The composition according to  claim 13 , wherein the cationic coagulant is an inorganic coagulant chosen from aluminum sulfate, aluminum chloride, ferric sulfate, ferric chloride, polyaluminum sulfate, polyaluminum chloride, aluminum chlorohydrate, polyaluminum sulfate chloride, polyaluminum silicate chloride, polyferric chloride, polyferric sulfate, polyferric sulfate chloride, polyferric silicate chloride, and their combination. 
     
     
         17 . The composition according to  claim 13 , wherein the cationic coagulant is an organic cationic coagulant chosen from linear or crosslinked copolymer of epihalohydrin and aliphatic amine, poly (diallyl dimethyl ammonium chloride), copolymer and terpolymer containing cationic monomer of tertiary amino carboxylate, diallyl dimethyl ammonium chloride or vinylamine, melamine-formaldehyde resin, cationic starch, chitosan, cationic guar gum, and their combination. 
     
     
         18 . The composition according to  claim 13 , wherein the proportion by weight of non-ionic cellulose ether to cationic coagulant in the composition is 1:0.1-1:100. 
     
     
         19 . The composition according to  claim 18 , wherein the proportion by weight of non-ionic cellulose ether to cationic coagulant in the composition is 1:0.5-1:20. 
     
     
         20 . The composition according to  claim 19 , wherein the proportion by weight of non-ionic cellulose ether to cationic coagulant in the composition is 1:1-1:10.