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1. 发明专利

JP2008189587A Method for producing aqueous cyanamide solution and dicyandiamide 审中-公开
标题翻译：生产水杨酸溶液和二氰胺的方法
公开(公告)号：JP2008189587A
公开(公告)日：2008-08-21
申请号：JP2007025057
申请日：2007-02-05
申请人： Masanori Sasaki , 正典佐々木
发明人： SASAKI MASANORI , LUI HAIPIN
IPC分类号： C07C277/02 , C07C277/06 , C07C279/28
摘要： PROBLEM TO BE SOLVED: To provide a method for separating a carbon component, a nitrogen component in a cyanamide form, and a calcium component each contained in nitrolime and co-producing carbon, an aqueous cyanamide solution or dicyandiamide, and calcium carbonate individually as three separate products, which method solves problems associated with a prior art technique that the calcium component and carbon component of nitrolime cannot be separated and the raw material is not effectively utilized upon producing an aqueous cyanamide solution or dicyandiamide from nitrolime.
SOLUTION: An aqueous solution of cyanamide is prepared by treating nitrolime obtained by nitriding calcium carbide with an aqueous solution containing cyanamide, removing carbon which is an insoluble component, subsequently treating the clear liquid with carbon dioxide gas, and separating the calcium component by precipitating it as calcium carbonate. The cyanamide solution thus obtained is subjected to a polymerization reaction under an alkaline condition to obtain dicyandiamide. The method described above is capable of concurrently separating and co-producing the three components using nitrolime as a starting material.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：待解决的问题：提供一种分离碳成分，氨基氰形式的氮成分和各自包含在硝基肟和共产生碳中的钙成分，氨水溶液或双氰胺水溶液和碳酸钙的方法分别作为三种分开的产品，该方法解决了与以往技术相关的问题，即从硝基肟制备氨基氰水溶液或双氰胺时，不能将硝化肟的钙成分和碳成分分离出来，原料未被有效利用。解决方案：通过处理通过用含有氰胺的水溶液氮化碳化钙获得的硝基肟来制备氰胺水溶液，除去作为不溶成分的碳，随后用二氧化碳气体处理透明液体，并将钙成分通过将其沉淀为碳酸钙。将由此获得的氰酰胺溶液在碱性条件下进行聚合反应，得到双氰胺。上述方法能够使用硝肟作为起始材料，同时分离和共同生产三种组分。版权所有（C）2008，JPO＆INPIT

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