发明名称 |
METHOD FOR PURIFYING SOLUTIONS CONTAINING CYANAMIDE |
摘要 |
The invention relates to a method for purifying solutions containing cyanamide, according to which the parent solution is subjected to a membrane filtration at temperatures of between -20 and +80 DEG C, whereby the separation membrane has an MWCO value of between 80 Da and 60 kDa and the parent solution is subjected to a pressure of between 2.5 and 60 bar. In said method, which preferably operates according to the feed-and-bleed principle and whereby the solution retained by the membrane is subjected to a circulatory flow in front of the membrane, parent solutions having a cyanamide content of between 5 and 60 wt. % are used. This permits over 80 % of compounds containing in particular calcium, iron, nickel and silicon to be eliminated from the solutions used. |
申请公布号 |
WO03089372(A3) |
申请公布日期 |
2004.02.05 |
申请号 |
WO2003EP04086 |
申请日期 |
2003.04.16 |
申请人 |
DEGUSSA AG;GUETHNER, THOMAS;FASENACHT, JOHANN |
发明人 |
GUETHNER, THOMAS;FASENACHT, JOHANN |
分类号 |
B01D61/02;B01D61/14;B01D71/64;C01B21/12;C01C3/16 |
主分类号 |
B01D61/02 |
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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