| 摘要 |
1,202,133. Alkali metals salts of amino polycarboxylic acids. KNAPSACK A.G. 16 Jan., 1969 [2 Feb., 1968], No. 2572/69. Heading C2C. A process for the manufacture of alkali metal salts of amino polycarboxylic acids by reaction of a suitable carboxylic acid nitrile with aqueous alkali at elevated temperature, which comprises producing a reaction mixture by suspending the amino polycarboxylic acid nitrile in an aqueous alkali metal hydroxide solution, which has a minimum strength of 30% by weight and contains at least stoichiometric proportions of alkali metal hydroxide; introducing the resulting suspension into a reactor heated to a temperature between 60 and 150‹ C., inducing and effecting salt formation by thorough agitation, if desired with the application of pressure, the suspension being introduced into the reactor at a rate sufficient for the foaming and briskly reacting reaction mixture to remain within a zone of thorough mixing; using substantially the reaction heat evolved for removing from the reactor ammonia formed in situ during the reaction and water present therein, the removal of the water and ammonia being effected continuously at a rate sufficient for all of the reaction mixture to remain moist with water or steam during the reaction; and evaporating the resulting reaction product. |
