发明授权
US3919297A N-(1,1-di-phosphono ethyl) acetamidine, process of making it, and method of using it for preventing scale formation
失效
N-（1,1-二膦酰基乙基）乙脒，其制备方法，及其用于防止结垢形成的方法
- 专利标题： N-(1,1-di-phosphono ethyl) acetamidine, process of making it, and method of using it for preventing scale formation
- 专利标题（中）： N-（1,1-二膦酰基乙基）乙脒，其制备方法，及其用于防止结垢形成的方法
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申请号： US45636674申请日： 1974-03-29
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公开(公告)号： US3919297A公开(公告)日： 1975-11-11
- 发明人: KRUEGER FRIEDRICH , MICHEL WALTER
- 申请人： BENCKISER GMBH JOH A
- 专利权人： Benckiser Gmbh Joh A
- 当前专利权人： Benckiser Gmbh Joh A
- 优先权： DE2316396 1973-04-02
- 主分类号： C02F5/14
- IPC分类号： C02F5/14 ; C07F9/38
摘要：
N-(1,1-Di-phosphono ethyl) acetamidine has proved to be an excellent agent for preventing scale and deposit formation in aqueous systems, even when added in substoichiometric amounts. It is produced by reacting urea or acetylurea with acetylchloride and phosphorous acid or a mixture of phosphorus trichloride and water in an amount sufficient to produce phosphorous acid. The acetylchloride may be formed during the reaction from phosphorous trichloride and glacial acetic acid or acetic acid anhydride.
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