| 摘要 |
<p num="1"><br/><br/><br/>A beneficial method for the manufacture of amino polyalkylene phosphonic <br/>acids, under substantial absence of hydrohalogenic acid, is disclosed. The <br/>method, in essence, is based on reacting narrowly defined ratios of <br/>phosphorous acid, an amine and a formaldehyde in presence of a heterogeneous <br/>Broensted acid catalyst. The inventive method is capable of yielding <br/>economically and quality operational/capacity advantages, in particular <br/>significantly reduced one-step cycle duration under exclusion of corrosion <br/>disadvantages and also is environmentally friendly without requiring, in that <br/>respect, anything more than nominal capital expenditures.<br/>
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