Study of Trisodium Borate Formation and Its Reaction with Green Liquor in Partial Autocausticizing
Date of Award
Master of Science
Chemical and Paper Engineering
Paper Engineering, Chemical Engineering and Imaging
Dr. John Cameron
Dr. David Peterson
Dr. Said AbuBakr
Masters Thesis-Open Access
This thesis investigates a new development of autocausticizing the green liquor with trisodium borate. Sodium metaborate (NaBO2) reacts with the sodium carbonate (Na2CO3) in the char bed at 850°C in the recovery furnace to form trisodium borate (Na3BO3) which in tum, when dissolved in water produces sodium hydroxide (NaOH) regenerating sodium metaborate (NaBO2). The main objective of this research is to study the formation of trisodium borate from the reaction of sodium metaborate with sodium carbonate at different molar ratios of carbonate to borate and to determine the effect of the process parameters such as products concentration and temperature on the reaction of trisodium borate with green liquor producing sodium hydroxide. The results show evidence of trisodium borate formation due to decarbonization of sodium carbonate by sodium metaborate and with increase in sodium carbonate to sodium metaborate molar ratios, the decarbonization of sodium carbonate lowers, where more carbon dioxide (CO2) is released, which needs to be effectively purged out to improve decarbonization. The reaction of trisodium borate with green liquor (Na2S, H2O and Na2CO3) was fast and about 85% of trisodium borate formed reacts with water to form sodium hydroxide.
Subbaiyan, Pasupathy Rajan, "Study of Trisodium Borate Formation and Its Reaction with Green Liquor in Partial Autocausticizing" (2003). Masters Theses. 4957.