发明名称 |
METHOD FOR PRODUCING SODIUM DITHIONITE |
摘要 |
The invention relates to a method for producing sodium dithionite comprising the steps (a) production of a synthesis batch consisting of sodium formate, sulphur dioxide and an alkaline sodium compound in an aqueous methanol solvent, which forms a sodium dithionite mother liquor, (b) separation of the sodium dithionite from the sodium dithionite mother liquor, leaving a residual mother liquor, (c) separation of methanol from the residual mother liquor, (d) separation of the residual mother liquor into a first sub-stream that is rich in thiosulphate and a second sub-stream that is devoid of thiosulphate, but contains formate by means of a nanofiltration, (e) concentration of sodium formate in the second sub-stream and (f) return of the concentrated second sub-stream to step (a). |
申请公布号 |
WO2006048293(A2) |
申请公布日期 |
2006.05.11 |
申请号 |
WO2005EP11786 |
申请日期 |
2005.11.03 |
申请人 |
BASF AKTIENGESELLSCHAFT;DIEFENBACHER, ARMIN;VOSS, HARTWIG;SCHNEIDER, REINHARD |
发明人 |
DIEFENBACHER, ARMIN;VOSS, HARTWIG;SCHNEIDER, REINHARD |
分类号 |
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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