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    • 5. 发明授权
    • Biuret purification
    • 缩二脲纯化
    • US4698443A
    • 1987-10-06
    • US753693
    • 1985-07-10
    • Donald C. YoungJames A. Green, II
    • Donald C. YoungJames A. Green, II
    • C07C273/18C07C127/24C07C126/08
    • C07C273/189Y02P20/125
    • Purified biuret is recovered from mixtures containing biuret and higher molecular weight urea condensation products by contacting melts or solutions of such mixtures with a polar adsorbent and extracting biuret from the adsorbent with a polar desorbent. The useful biuret-containing mixtures also may contain urea. These methods are capable of recovering biuret of 99.9 percent plus purity from mixture containing higher molecular weight urea condensations products such as triuret, melamine, ammelide, and others. The biuret-containing desorbent can be recycled into contact with biuret-containing adsorbents to increase its biuret concentration, concentrated by evaporation of otherwise, and/or treated to crystallize biuret. An integrated process is provided which involves pyrolyzing urea to form biuret and higher molecular weight condensation products and selectively recovering biuret from the resulting pyrolyzed urea as described.
    • 通过将这种混合物的熔体或溶液与极性吸附剂接触并用极性解吸剂从吸附剂中萃取缩二脲,从含有缩二脲和较高分子量的脲缩合产物的混合物中回收纯化的缩二脲。 有用的含缩二脲化合物的混合物还可以含有尿素。 这些方法能够从含有较高分子量尿素缩合产物的混合物(如三脲,三聚氰胺,等等)回收99.9%的纯度的缩二脲。 含缩二官能的脱附剂可以再循环到与含缩二脲的吸附剂接触以增加其缩二脲浓度,通过另外蒸发浓缩和/或处理以结晶缩二脲。 提供了一种综合方法,其包括热解尿素以形成缩二脲和较高分子量缩合产物,并如所述从所得热解脲选择性回收缩二脲。
    • 6. 发明授权
    • Methods for removing biuret from urea by ion exchange
    • 通过离子交换从尿素中除去缩二脲的方法
    • US4658059A
    • 1987-04-14
    • US567271
    • 1983-12-30
    • Donald C. YoungJames A. Green, II
    • Donald C. YoungJames A. Green, II
    • C07C273/18C07C275/62C07C126/08
    • C07C273/189C07C275/62
    • Methods are provided for removing biuret from biuret-containing aqueous urea solutions which methods involve contacting a quantity of a biuret-containing aqueous urea feed solution with the hydroxide ion form of an anion exchanger under conditions sufficient to remove at least a portion of the biuret from the feed solution, and regenerating the resulting biuret-containing anion exchanger, at least in part, by contact with a substantially non-alkaline aqueous regenerant under conditions sufficient to remove at least a portion of the biuret from the anion exchanger. After completion of the described contacting with the substantially non-alkaline aqueous regenerant, the anion exchanger can optionally be further regenerated by contact with an aqueous solution of a strong base to remove additional quantities of biuret and/or other anion exchanger contaminants such as alkaline earth metal and carbonate ions and/or compounds. Methods are also provided in which one or more of the aqueous process streams which contact the anion exchanger have been treated (or comprise aqueous media which have been treated) to reduce the concentration of alkaline earth metal compounds and/or carbonate in such aqueous process streams.
    • 提供了用于从含缩二脲水溶液的尿素溶液中除去缩二脲的方法,该方法包括使一定量的含缩二脲水的尿素进料溶液与阴离子交换剂的氢氧根离子形式接触,所述条件足以将至少一部分缩二脲从 进料溶液,并且在足以从阴离子交换器除去至少一部分缩二脲的条件下至少部分地通过与基本上非碱性的水性再生剂接触来再生所得到的缩二脲包含阴离子交换剂。 在完成所述与基本上非碱性的水性再生剂的接触后,阴离子交换剂可以任选地通过与强碱的水溶液接触进一步再生,以除去附加量的缩二脲和/或其它阴离子交换剂污染物如碱土 金属和碳酸根离子和/或化合物。 还提供了一种方法,其中接触阴离子交换剂的一种或多种含水工艺物流已被处理(或包括已经处理过的含水介质)以降低这些含水工艺流中的碱土金属化合物和/或碳酸盐的浓度 。
    • 7. 发明授权
    • Methods for purifying biuret
    • 净化缩二脲的方法
    • US4645859A
    • 1987-02-24
    • US725304
    • 1985-04-19
    • James A. Green, IIDonald C. Young
    • James A. Green, IIDonald C. Young
    • C07C273/18C07C275/62C07C126/08
    • C07C275/62C07C273/189Y02P20/125
    • Methods are provided for recovering purified biuret from aqueous solutions containing biuret and higher molecular weight urea condensation products by contacting such solutions with the hydroxide ion form of an anion exchanger and extracting biuret from the ion exchanger with an aqueous extractant. The useful biuret-containing solutions also may contain urea. These methods are capable of recovering biuret of 99.9 percent plus purity from solutions containing higher molecular weight urea condensations products such as triuret, melamine, ammelide, and others. Elevated temperatures increase biuret recovery rate and concentration, and the extractant can be recycled into contact with additional biuret-containing anion exchangers to increase biuret concentration even further. The biuret-containing extract can be employed as is, concentrated by evaporation or otherwise, or treated to crystallize biuret. An integrated process is provided which involves pyrolyzing urea to form biuret and higher molecular weight condensation products and selectively recovering biuret from an aqueous solution of the resulting pyrolyzed urea as described.
    • 提供了用于从含有缩二脲和较高分子量的尿素缩合产物的水溶液中回收纯化的缩二脲的方法,其通过使这些溶液与阴离子交换剂的氢氧根离子形式接触并用水提取剂从离子交换剂中提取缩二脲。 有用的含缩二脲的溶液也可以含有尿素。 这些方法能够从含有较高分子量尿素缩合产物如三脲,三聚氰胺,其它的溶液的溶液中回收99.9%的纯度的缩二脲。 升高的温度增加了缩二脲的回收速率和浓度,并且萃取剂可以再循环与另外的含缩二脲的阴离子交换剂接触以进一步增加缩二脲浓度。 含缩二脲的提取物可以原样使用,通过蒸发或其它方式浓缩,或者进行处理以结晶缩二脲。 提供了一种综合方法,其包括热解尿素以形成缩二脲和较高分子量缩合产物,并如所述从所得热解脲的水溶液中选择性回收缩二脲。
    • 8. 发明授权
    • Method of soil nitrification inhibition by application of a stabilized
fumigant composition
    • 通过施用稳定的熏蒸剂组合物的土壤硝化抑制方法
    • US4551167A
    • 1985-11-05
    • US633014
    • 1984-07-20
    • Donald C. YoungJames A. Green, II
    • Donald C. YoungJames A. Green, II
    • A01N25/22A01N59/02A01N59/04A01N59/06B01F5/00C01D13/00C05G3/00C05G3/08
    • C05G3/0005A01N25/22A01N59/02A01N59/04A01N59/06C01D13/00Y10S71/902Y10S71/903
    • A stabilized fumigant composition comprises an aqueous solution containing up to about fifty percent by weight of a solute which comprises ammonia, hydrogen sulfide and carbon disulfide. Elemental sulfur can also be a component of the solute. One preferred composition comprises a solution wherein the molarity of hydrogen sulfide is about 1.5 times the molarity of carbon disulfide, and is about one-half the molarity of ammonia, and wherein the molarity of sulfur is about 1.6 times the molarity of carbon disulfide.The composition decomposes in a soil environment to form sources of available plant nutrients, including ammonia, hydrogen sulfide and sulfur, and carbon disulfide which inhibits nitrification and decreases the nematode population. Nutrient content can be enhanced by the addition of, for example, ammonia, ammonium nitrate, urea and mixtures thereof to the formed composition.The composition can also be decomposed by dilution or heat application, or both, to yield its components for non-soil fumigation uses.
    • 稳定的熏蒸剂组合物包含含有至多约50重量%的包含氨,硫化氢和二硫化碳的溶质的水溶液。 元素硫也可以是溶质的成分。 一种优选的组合物包括其中硫化氢的摩尔浓度为二硫化碳的摩尔数的约1.5倍的溶液,并且其为氨的摩尔浓度的约一半,并且其中硫的摩尔浓度为二硫化碳摩尔浓度的约1.6倍。 该组合物在土壤环境中分解形成可用植物营养物质的来源,包括氨,硫化氢和硫,以及抑制硝化并降低线虫种群的二硫化碳。 通过向所形成的组合物中加入例如氨,硝酸铵,尿素及其混合物可以提高营养成分含量。 组合物也可以通过稀释或热施用或两者分解,以产生其用于非土壤熏蒸用途的组分。