| 摘要 |
A method for producing compositions used in sodium dithionite production is presented, in which SO2 is brought into contact with a recirculating water solution of NaOH and previously absorbed SO2 at a ratio between SO2 and the sum of SO2 and Na2O of 0.61-0.66, preferably 0.63-0.65, after which the mixture is transferred to a pressure vessel and liquid SO2 is introduced into the mixture at a ratio between SO2 and the sum of SO2 and Na2O of 0.75-0.79, preferably around 0.775, and a concentration of SO2+Na2O of 40-46 percent by weight, preferably 43-44 percent by weight. The invention is also the use of the produced composition for dithionite production. |
