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    • 3. 发明授权
    • Process for the removal of chlorate and hypochlorite from spent alkali
metal chloride brines
    • 从废碱金属氯化物盐水中除去氯酸盐和次氯酸盐的方法
    • US4405465A
    • 1983-09-20
    • US393578
    • 1982-06-30
    • Sanders H. MooreRonald L. Dotson
    • Sanders H. MooreRonald L. Dotson
    • C25B15/08C25B1/34
    • C25B15/08
    • A process is described for reducing the concentration of oxyhalogen impurities in an alkali metal halide brine recovered from an electrolytic cell which comprises circulating the alkali metal halide brine to a treatment zone outside of the electrolytic cell. Within the treatment zone, the alkali metal halide brine is reacted with oxalic acid while maintaining the alkali metal halide brine at a pH of less than about 4.5. A purified brine having a substantially reduced concentration of oxyhalogen impurities is recovered from the treatment zone. The process may be employed in treating brines recovered from mercury cells and membrane cells for the production of chlorine and alkali metal hydroxides and its employment results in a substantial reduction in the amount of concentrated acid required in brine treatment and a reduction in energy costs for brine purification.
    • 描述了一种用于降低从电解池回收的碱金属卤化物盐水中的卤代卤素杂质的浓度的方法,该方法包括将碱金属卤化物盐水循环到电解池外部的处理区。 在处理区内,碱金属卤化物盐水与草酸反应,同时保持碱金属卤化物盐水的pH低于约4.5。 从处理区回收具有显着降低的卤代卤素杂质浓度的纯化盐水。 该方法可用于处理从汞电池和膜电池回收的用于生产氯和碱金属氢氧化物的盐水,并且其使用导致盐水处理中所需的浓缩酸的量的显着减少以及盐水能量成本的降低 纯化。
    • 4. 发明授权
    • Hydroxylammonium nitrate free of ammonium nitrate
    • 硝酸铵不含硝酸铵
    • US5651951A
    • 1997-07-29
    • US445480
    • 1995-05-22
    • David W. CawlfieldRonald L. DotsonHarry J. LoftisSanders H. MooreRobert T. BrookerJay S. Stirrat
    • David W. CawlfieldRonald L. DotsonHarry J. LoftisSanders H. MooreRobert T. BrookerJay S. Stirrat
    • C01B21/14C01B21/20
    • C01B21/1454
    • The present invention relates to a multi-step process for producing HAN that is free of ammonium nitrate. The process comprises the steps of: (a) stripping ammonia from an ammonia-containing, aqueous hydroxylamine solution having a hydroxylamine concentration of at least 10% by weight based upon the weight of the hydroxylamine solution, by contacting the ammonia-containing hydroxylamine solution with a stripping agent selected from the group consisting of inert gases and steam to provide an ammonia-free, aqueous hydroxylamine solution, and (b) reacting the ammonia-free, aqueous hydroxylamine solution with aqueous nitric acid having an acid concentration of at least about 0.1%, preferably at least about 20%, based upon the weight of the aqueous nitric acid, to produce ammonium nitrate-free HAN. In another process embodiment of the invention, the above-described ammonia stripping step is not required, and the hydroxylamine concentration is at least about 0.5%, based upon the weight of the reaction mixture employed. Also disclosed is the ammonium nitrate-free HAN product produced by the process of this invention.
    • 本发明涉及一种不含硝酸铵的生产HAN的多步法。 该方法包括以下步骤:(a)通过使含氨的羟胺溶液与含羟胺的羟胺溶液接触,从基于羟胺溶液重量的羟胺浓度至少为10重量%的含氨基羟胺溶液中除去氨 选自惰性气体和蒸汽的汽提剂,以提供无氨的羟胺水溶液,和(b)使无氨水羟胺溶液与酸浓度为至少约0.1的硝酸水溶液反应 %,优选至少约20%,基于硝酸水溶液的重量,以产生不含硝酸铵的HAN。 在本发明的另一方法实施方案中,不需要上述氨汽提步骤,并且基于所用反应混合物的重量,羟胺浓度为至少约0.5%。 还公开了通过本发明的方法生产的不含硝酸铵的HAN产物。
    • 5. 发明授权
    • Hydroxylammonium nitrate free of ammonium nitrate
    • 硝酸铵不含硝酸铵
    • US5510097A
    • 1996-04-23
    • US245928
    • 1994-05-19
    • David W. CawlfieldRonald L. DotsonHarry J. LoftisSanders H. MooreRobert T. BrookerJay S. Stirrat
    • David W. CawlfieldRonald L. DotsonHarry J. LoftisSanders H. MooreRobert T. BrookerJay S. Stirrat
    • C01B21/14C01B21/20
    • C01B21/1454
    • The present invention relates to a multi-step process for producing HAN that is free of ammonium nitrate. The process comprises the steps of: (a) stripping ammonia from an ammonia-containing, aqueous hydroxylamine solution having a hydroxylamine concentration of at least 10% by weight based upon the weight of the hydroxylamine solution, by contacting the ammonia-containing hydroxylamine solution with a stripping agent selected from the group consisting of inert gases and steam to provide an ammonia-free, aqueous hydroxylamine solution, and (b) reacting the ammonia-free, aqueous hydroxylamine solution with aqueous nitric acid having an acid concentration of at least about 0.1%, preferably at least about 20%, based upon the weight of the aqueous nitric acid, to produce ammonium nitrate-free HAN. In another process embodiment of the invention, the above-described ammonia stripping step is not required, and the hydroxylamine concentration is at least about 0.5%, based upon the weight of the reaction mixture employed. Also disclosed is the ammonium nitrate-free HAN product produced by the process of this invention.
    • 本发明涉及一种不含硝酸铵的生产HAN的多步法。 该方法包括以下步骤:(a)通过使含氨的羟胺溶液与含羟胺的羟胺溶液接触,从基于羟胺溶液重量的羟胺浓度至少为10重量%的含氨基羟胺溶液中除去氨 选自惰性气体和蒸汽的汽提剂,以提供无氨的羟胺水溶液,和(b)使无氨水羟胺溶液与酸浓度为至少约0.1的硝酸水溶液反应 %,优选至少约20%,基于硝酸水溶液的重量,以产生不含硝酸铵的HAN。 在本发明的另一方法实施方案中,不需要上述氨汽提步骤,并且基于所用反应混合物的重量,羟胺浓度为至少约0.5%。 还公开了通过本发明的方法生产的不含硝酸铵的HAN产物。