New Advanced Technology on Waste Resourcelization of the Black Pulping Liquor |
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Authors: | ZHOU Yi HAN Yuan-yuan and ZHANG Dong-xiang |
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Affiliation: | Civil and Environment Technology Beijing,University of Science and Technology Beijing,Beijing 100083,China; School of Chemical Engineering and Environment,Beijing Institute of Technology,Beijing 100081,China;School of Chemical Engineering and Environment,Beijing Institute of Technology,Beijing 100081,China;School of Chemical Engineering and Environment,Beijing Institute of Technology,Beijing 100081,China |
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Abstract: | Combining the characteristics of the black pulping liquor that contains a lot of lignin and other biomass resources, the technology of comprehensive waste utilization is employed. The reconstructive preparation of modified urea-formaldehyde glue by adding black pulping liquor and the application in extruding the medium density fibre board using this modified urea-formaldehyde glue is researched. Results show that when applying the preparation technology that alkaline reaction and then weak acid reaction, the appropriate preparation process is as follows: the adding urea process is divided into three stages (proportion 2∶1∶1); the pH value is 8.0, and the reaction time is 40min in the addition reaction stage; the pH value will be naturally reduced to 3.5-5.0, and the reaction time is 45min in the aggregation reaction stage; the pH value is 8.0 in the urea complement stage. And the optimal condition of the reconstructive preparation the modified urea-formaldehyde glue is adding the condensed black pulping liquor after hydroxymethylation in the beginning of polycondensation reaction by 5% proportion. The application in extruding medium density fibre board with this modified urea-fosmaldehyde glue is proved feasible. |
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Keywords: | pulping black liquor comprehensive utilization of the waste pH effect to urea-formaldehyde glue production |
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