Production of sodium sulfite

专利名称：Production of sodium sulfite发明人：Robert Joel Hoffman,Samuel Louis

Bean,Philip Seeling,James William Swaine, Jr.

申请号：US05/653876申请日：19760130公开号：US04003985A公开日：19770118

摘要：Anhydrous sodium sulfite is made by a process involving introducing

substantially anhydrous sodium carbonate concurrently with sulfur dioxide- containinggas into a saturated solution of sodium sulfite maintained at pH of between about 6.5and about 7.6 at temperature above about 35. degree. C. to form a slurry of anhydroussodium sulfite crystals, and withdrawing the crystals from the slurry. The process isinitiated using a concentrated sodium sulfite solution containing less than about 3 ppm ofdissolved iron.

申请人：ALLIED CHEMICAL CORPORATION

代理人：Gerhard H. Fuchs

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