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    • 2. 发明授权
    • Process for producing phosphorous acid
    • 亚磷酸生产方法
    • US06194604B1
    • 2001-02-27
    • US09274629
    • 1999-03-23
    • Yinong MaJerald D. Heise
    • Yinong MaJerald D. Heise
    • C07F938
    • C01B25/163
    • A process for the manufacture of phosphorous acid by selective hydrolysis of phosphite esters. A hydrolysis feed mixture comprising phosphite esters and phosphate esters is contacted with liquid water or steam to selectively hydrolyze the phosphite esters to phosphorous acid. The feed mixture may be prepared by oxidation of elemental phosphorous in the presence of an alcohol. In the oxidation and/or a subsequent esterification step, P(III) and P(V) oxyacids produced in the oxidation reaction are esterified, preferably quantitatively. The ester mixture may be washed to remove unesterified phosphoric and hypophosphorous acid, after which the selective hydrolysis is carried out.
    • 通过选择性水解亚磷酸酯制备亚磷酸的方法。 将包含亚磷酸酯和磷酸酯的水解进料混合物与液态水或蒸汽接触以选择性地将亚磷酸酯水解成亚磷酸。 进料混合物可以通过在醇存在下氧化元素磷来制备。 在氧化和/或随后的酯化步骤中,在氧化反应中产生的P(III)和P(V)含氧酸优选定量地酯化。 可以洗涤酯混合物以除去未酯化的磷酸和次磷酸,然后进行选择性水解。
    • 10. 发明授权
    • Process for making ammonium glyphosate powder
    • 制备草甘膦铵粉的方法
    • US06448434B1
    • 2002-09-10
    • US09624949
    • 2000-07-25
    • Richard M. Kramer
    • Richard M. Kramer
    • C07F938
    • C07F9/3813A01N57/20A01N25/14A01N2300/00
    • A process is provided for preparing ammonium glyphosate powder suitable for downstream processing by extrusion to make a granular formulation comprising ammonium glyphosate and surfactant. The process comprises (a) mixing (i) solid particulate glyphosate acid, (ii) water in an amount of about 0.5 to about 3 parts by weight per part by weight of glyphosate acid, and (iii) a base that supplies ammonium cations, in an amount of about 0.8 to about 1.25 mole equivalents of ammonia per mole of glyphosate acid, to form an aqueous reaction medium; (b) allowing the glyphosate acid to react with the base in the reaction medium to form a reaction product comprising a concentrated aqueous solution of ammonium glyphosate; (c) drying the reaction product, for example with a drum dryer, to recover a particulate solid; and (d) accelerating the particulate solid in a turbulent high-velocity gas stream, for example in a jet mill, to form by particle-particle attrition an ammonium glyphosate powder having a mean particle size of about 5 to about 20 &mgr;m.
    • 提供了一种通过挤出制备适于下游加工的草甘膦铵粉末以制备包含草甘膦和表面活性剂的颗粒制剂的方法。 该方法包括(i)混合(i)固体颗粒草甘膦酸,(ii)约0.5至约3重量份的量的草甘膦酸,和(iii)提供铵阳离子的碱, 其量为每摩尔草甘膦酸约0.8至约1.25摩尔当量的氨,以形成水性反应介质; (b)使草甘膦酸与反应介质中的碱反应形成包含浓缩的草甘膦铵水溶液的反应产物; (c)干燥反应产物,例如用滚筒式干燥器回收颗粒状固体; 和(d)加速湍流高速气流中的颗粒状固体,例如在喷射式研磨机中,通过粒子颗粒磨损形成平均粒度约5至约20微米的草甘膦粉末。