发明名称 |
Process for treating the mother liquor by pH adjusting in the production of anhydrous sodium dithionite |
摘要 |
In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises adding an alkali to the mother liquor left after the separation of the resulting anhydrous sodium dithionite to adjust its pH to at least 8, separating the solids precipitated, and oxidizing the filtrate with an oxidizing agent.
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申请公布号 |
US4042675(A) |
申请公布日期 |
1977.08.16 |
申请号 |
US19760687448 |
申请日期 |
1976.05.18 |
申请人 |
MITSUI TOATSU CHEMICALS, INCORPORATED |
发明人 |
YAMAMOTO, KOUSUKE;TAKENAKA, SHINJI;MAEDA, KAZUO;MITUTA, MICHIO |
分类号 |
C01B17/66;(IPC1-7):C01B17/66 |
主分类号 |
C01B17/66 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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