-
1.发明授权
公开(公告)号：US4915705A
公开(公告)日：1990-04-10
申请号：US224223
申请日：1988-07-22
申请人： Phillip D. Mollere , Tadeusz K. Wiewiorowski , Vivian C. Astley , Willis L. Thornsberry, Jr. , Michael A. Murray
发明人： Phillip D. Mollere , Tadeusz K. Wiewiorowski , Vivian C. Astley , Willis L. Thornsberry, Jr. , Michael A. Murray
CPC分类号： C01B33/186 , C01B9/08 , C01C1/162 , C01D3/02 , C01F11/22 , C01P2006/10 , C01P2006/12 , C01P2006/80
摘要： A process for producing high grade silica and fluorine-containing coproducts from fluosilicic acid is described. To produce silica, the fluosilicic acid is reacted with aqueous ammonia to produce a solid silica product and a solution of ammonium fluoride. The solid silica is washed under controlled conditions and further processed to produce a high grade product. The ammonium fluoride solution is concentrated and sold as a concentrated ammonium fluoride solution product or reacted with metal hydoxides or oxides to produce metal fluorides.
摘要翻译： 描述了由氟硅酸生产高级二氧化硅和含氟副产物的方法。 为了生产二氧化硅，氟硅酸与氨水反应生成固体二氧化硅产物和氟化铵溶液。 将固体二氧化硅在受控条件下洗涤并进一步加工以生产高级产品。 将氟化铵溶液浓缩并作为浓缩的氟化铵溶液产物出售，或与金属氧化物或氧化物反应以产生金属氟化物。
-
公开(公告)号：US4105741A
公开(公告)日：1978-08-08
申请号：US664996
申请日：1976-03-08
CPC分类号： C22B60/026
摘要： Process for the recovery of uranium from wet process phosphoric acid solution in which an organic extractant, containing uranium values and dissolved iron impurities and comprising a dialkylphosphoric acid and a trialkylphosphine oxide dissolved in a water immiscible organic solvent, is contacted with a substantially iron-free dilute aqueous phosphoric acid to remove said iron impurities. The removed impurities are bled from the system by feeding the resulting iron-loaded phosphoric acid to a secondary countercurrent uranium extraction operation from which they leave as part of the uranium-depleted acid raffinate. Also, process for recovering uranium in which the extractant, after it has been stripped of uranium values by aqueous ammonium carbonate, is contacted with a dilute aqueous acid selected from the group consisting of H.sub.2 SO.sub.4, HCl, HNO.sub.3 and iron-free H.sub.3 PO.sub.4 to improve the extraction efficiency of the organic extractant.
摘要翻译： 从湿法磷酸溶液中回收铀的方法，其中含有铀值和溶解的铁杂质的有机萃取剂，并且包含溶于水不混溶的有机溶剂中的二烷基磷酸和三烷基氧化膦与基本上无铁的物质接触 稀释磷酸水溶液以除去所述铁杂质。 通过将所得的铁负载磷酸进料到作为贫铀酸提余液的一部分离开的二次逆流铀提取操作，将所除去的杂质从体系中排出。 此外，回收铀的方法，其中萃取剂在用碳酸铵水溶液除去铀值之后，与选自H 2 SO 4，HCl，HNO 3和无铁H 3 PO 4的稀酸水溶液接触，以改善 有机萃取剂的提取效率。
-
公开(公告)号：US5698003A
公开(公告)日：1997-12-16
申请号：US575025
申请日：1995-12-19
CPC分类号： C05G3/08 , C05C9/00 , Y10S71/902
摘要： Improved solvent systems for the formulation of N-alkyl thiophosphoric triamide urease inhibitors. These formulations enable the preparation of stable concentrated solutions of N-alkyl thiophosphoric triamides for storage, transportation, and eventual impregnation onto solid urea containing fertilizers and incorporation into liquid urea containing fertilizer compositions. These formulations are comprised primarily of a solvent selected from the group consisting of glycols and glycol derivatives. Optionally, in addition to the glycol base solvent, the formulations can contain a co-solvent selected from the group consisting of liquid amides, 2-pyrrolidone and N-alkyl 2-pyrrolidones, and/or a nonionic surfactant selected from the group consisting of alkylaryl polyether alcohols. The presence of the co-solvent and/or surfactant has been found to impart desirable properties to the formulations under certain conditions. N-alkyl thiophosphoric triamides have been known for some time to be effective inhibitors of the activity of urease enzymes, however, commercial use has been inhibited by the lack of an acceptable carrier. They are often thermally and hydrolytically unstable and difficult to handle. The use of the solvent systems offers many advantages including: (1) improved stability of the active ingredient urease inhibitor; (2) excellent solubility characteristics; (3) extremely low flammability and toxicity of the solvents; (4) excellent cold temperature storage and handling characteristics with the addition of the liquid amide co-solvent; and (5) good adsorption characteristics onto solid urea containing fertilizers and excellent miscibility with liquid urea containing fertilizer formulations.
摘要翻译： 改进的用于制备N-烷基硫代磷酸三酰胺脲酶抑制剂的溶剂体系。 这些制剂使得能够制备N-烷基硫代磷酸三酰胺的稳定浓缩溶液，用于储存，运输和最终浸渍到固体含尿素肥料上并掺入含有液体尿素的肥料组合物中。 这些制剂主要由选自二醇和二醇衍生物的溶剂组成。 任选地，除了二醇基溶剂之外，制剂可以含有选自液体酰胺，2-吡咯烷酮和N-烷基2-吡咯烷酮的共溶剂，和/或选自以下的非离子表面活性剂： 烷基芳基聚醚醇。 发现共溶剂和/或表面活性剂的存在在某些条件下赋予制剂所需的性质。 N-烷基硫代磷酸三酰胺已知已有一段时间是有效的尿素酶活性抑制剂，然而商业用途已被缺乏可接受的载体所抑制。 它们通常是热和水解不稳定的并且难以处理。 使用溶剂系统具有许多优点，包括：（1）提高活性成分脲酶抑制剂的稳定性; （2）优异的溶解度特性; （3）溶剂的易燃性和毒性极低; （4）通过加入液体酰胺共溶剂，具有优异的低温储存和处理特性; 和（5）对固体含尿素肥料的吸附性能优异，与含有液体尿素的肥料配方具有优异的混溶性。
-
公开(公告)号：US5352265A
公开(公告)日：1994-10-04
申请号：US151553
申请日：1993-11-12
IPC分类号： C05C9/00
CPC分类号： C05C9/00 , Y10S71/902
摘要： An improved homogenous granular fertilizer composition is disclosed; the composition is comprised primarily of urea, N-(n-butyl)thiophosphoric triamide (NBPT), and dicyandiamide (DCD). The composition of this invention can be applied to a field crop in a single surface application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. The new improved composition increases the nitrogen uptake by plants, enhances crop yields, and minimizes the loss of both ammonium nitrogen and nitrate nitrogen from the soil.The NBPT is incorporated into the homogenous granular fertilizer composition of this invention by blending a concentrated solution of NBPT in a solvent selected from the group consisting of liquid amides, 2-pyrrolidone, and N-alkyl 2-pyrrolidones directly into molten urea prior to its granulation; the DCD may be added to the urea melt as a solid or in dissolved form along with the NBPT.
摘要翻译： 公开了一种改进的均匀颗粒肥料组合物; 该组合物主要由尿素，N-（正丁基）硫代磷酸三酰胺（NBPT）和双氰胺（DCD）组成。 本发明的组合物可以在单一表面施用中应用于田间作物，并且在其生长和成熟周期期间将向植物提供足够的氮。 新的改进的组合物增加植物的氮吸收，增加作物产量，并最小化来自土壤的铵氮和硝态氮的损失。 NBPT通过将NBPT的浓缩溶液在选自液体酰胺，2-吡咯烷酮和N-烷基2-吡咯烷酮的溶剂中直接掺入到熔融尿素中之前，将NBPT掺入本发明的均匀颗粒肥料组合物中 制粒 DCD可以与NBPT一起作为固体或溶解形式加入到尿素熔体中。
-
公开(公告)号：US5364438A
公开(公告)日：1994-11-15
申请号：US151280
申请日：1993-11-12
CPC分类号： C05C1/00 , C05G3/0064 , Y10S71/902
摘要： An improved fluid urea-containing fertilizer composition is disclosed; the composition is essentially comprised of an aqueous solution of urea, ammonium nitrate, N-(n-butyl)thiophosphoric triamide (NBPT), dicyandiamide (DCD), and may optionally also contain a clay as a suspending agent. The fluid fertilizer composition can be applied to a field crop in a single application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. As a result, the improved composition increases the nitrogen uptake efficiency of plants, enhances crop yields, and minimizes the loss of nitrogen from the soil.The NBPT is incorporated into the fluid fertilizer composition by blending a concentrated solution of N-(n-butyl)thiophosphoric triamide in a solvent selected from the group consisting of liquid amides such as an N-alkyl pyrrolidone directly with an aqueous solution of urea and ammonium nitrate, optionally also containing a suspending agent and commonly referred to in the fertilizer trade as UAN; the DCD may be added to the UAN fluid as a solid, a suspension, or in dissolved form along with the NBPT.
摘要翻译： 公开了一种改进的含有流体尿素的肥料组合物; 该组合物基本上由尿素，硝酸铵，N-（正丁基）硫代磷酸三酰胺（NBPT），双氰胺（DCD）的水溶液组成，并且还可任选地含有粘土作为悬浮剂。 流体肥料组合物可以在单一应用中施用于田间作物，并且将在其生长和成熟周期中向植物提供足够的氮。 结果，改进的组合物增加植物的氮吸收效率，增加作物产量，并最小化土壤中氮的损失。 NBPT通过将N-（正丁基）硫代磷酸三酰胺的浓缩溶液在选自由N-烷基吡咯烷酮的液体酰胺直接与尿素水溶液组成的组的溶剂中混合而并入流体肥料组合物中， 硝酸铵，任选地还含有悬浮剂，在化肥贸易中通常称为硝酸铵; DCD可以与NBPT一起作为固体，悬浮液或溶解形式加入到UAN流体中。
-
公开(公告)号：US5261957A
公开(公告)日：1993-11-16
申请号：US861134
申请日：1992-03-31
CPC分类号： C04B22/144 , C04B18/0445 , Y02W30/91
摘要： Stabilized phosphogypsum-containing compositions with low expansion and high compressive strength characteristics are prepared by admixing phosphogypsum with a cementitious binder having a calculated zero percent tricalcium aluminate content The compositions may contain phosphogypsum and cementitious binder only or they may also include sand or other filler material. The phosphogypsum composition is wetted with water, compacted and allowed to cure. The amount of water added preferably produces a maximum density of the compacted composition.
摘要翻译： 具有低膨胀和高抗压强度特性的稳定的含磷石膏的组合物通过将磷石膏与具有计算的零百分比的铝酸钙含量的水泥基粘合剂混合来制备。该组合物可以仅含有磷石膏和水泥粘合剂，或者也可以包括砂或其它填料。 磷石膏组合物用水润湿，压实并固化。 加入的水的量优选地产生压实组合物的最大密度。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.024 秒)
