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    • 21. 发明授权
    • Wet-process technique for refining phosphoric acid
    • 湿法精制磷酸技术
    • US06251351B1
    • 2001-06-26
    • US09155448
    • 1999-08-20
    • Istvan PotencsikAlexander Maurer
    • Istvan PotencsikAlexander Maurer
    • C01B2516
    • C01B25/46
    • A process for purification by multistage countercurrent extraction of wet-process phosphoric acid includes the steps of (a) preparing an aqueous phosphoric acid by decomposition of crude phosphates with sulfuric acid and prepurification thereof; (b) providing an organic solvent mixture consisting of one of (A) a water immiscible solvent and a fully water-miscible solvent or (B) a partially water-miscible solvent and a fully water-miscible solvent; (c) extracting water from the acid by contacting with the solvent mixture in a volumetric ratio of acid to solvent mixture of 1:1 to 1:10 at a temperature of 5 to 90° C.; (d) recovering the fully water-miscible solvent by distillation and washing; (e) recycling the fully water-miscible solvent to step (b) to provide a recycled solvent mixture; and (f) repeating steps (c), (d) and (e) with the recycled solvent mixture to provide a phosphoric acid having a preselected degree of purity.
    • 一种通过湿法磷酸的多级逆流提取进行纯化的方法包括以下步骤:(a)通过用硫酸分解粗制磷酸盐并预纯化制备磷酸水溶液; (b)提供由(A)与水不混溶的溶剂和完全与水混溶的溶剂之一组成的有机溶剂混合物或(B)部分水混溶性溶剂和完全与水混溶的溶剂; (c)在5至90℃的温度下,以1:1至1:10的体积比的酸与溶剂混合物与溶剂混合物接触,从酸中提取水; (d)通过蒸馏和洗涤回收完全与水混溶的溶剂; (e)将完全与水混溶的溶剂再循环到步骤(b)以提供循环的溶剂混合物; 和(f)用再循环的溶剂混合物重复步骤(c),(d)和(e),以提供具有预选纯度的磷酸。
    • 22. 发明授权
    • Process for the production of coarse-grained, anhydrous calcium
monohydrogen phosphate (dicalcium phosphate anhydride) and a device for
carrying out the process
    • 生产粗粒度,无水磷酸氢钙(磷酸二钙酐)的方法和用于进行该方法的装置
    • US5338524A
    • 1994-08-16
    • US997368
    • 1992-12-23
    • Alexander MaurerGuenter RaabGudrun RaabHans-Georg SteinertRichard Taenzler
    • Alexander MaurerGuenter RaabGudrun RaabHans-Georg SteinertRichard Taenzler
    • A61K8/00A61K8/24A61Q11/00C01B25/32
    • C01B25/322
    • The present invention provides a process and apparatus for the production of coarse-grained dicalcium phosphate anhydride, at least 95% of which consists of particles with a grain diameter of >45 .mu.m, wherein, at a temperature of 60.degree. to 100.degree. C., a highly reactive calcium component, for example freshly slaked milk of lime or an aqueous slurry or suspension of calcium hydroxide and/or calcium carbonate, is introduced directly into the stirrer zones of a vessel containing aqueous phosphoric acid and having one or more turbulent stirrer zones. An equivalent amount of aqueous phosphoric acid is introduced into another zone of the vessel, the speed of introduction being so regulated that a pH value of 3.0 to 4.5 is obtained in the stirrer zone and the whole batch or a continuously or semi-continuously removed part thereof is cooled to 40.degree. to 60.degree. C. The removed part then is mixed with an additional calcium component, for example milk of lime, to obtain a pH value of from 5.5 to 6.8, the mixture further stirred for 10 to 60 minutes and the resultant course-grained dicalcium phosphate anhydride is filtered off and dried.
    • 本发明提供了一种生产粗粒磷酸二钙酸酐的方法和装置,其中至少95%由粒径>45μm的颗粒组成,其中在60℃至100℃的温度下 将高活性钙组分,例如石灰的新鲜熟化的牛奶或氢氧化钙和/或碳酸钙的水性浆料或悬浮液直接引入含有磷酸水溶液的容器的搅拌器区域中并具有一个或多个湍流 搅拌区。 将等量的磷酸水溶液引入到容器的另一区域中,引入速度被调节到在搅拌器区域和整个批料中获得3.0至4.5的pH值,或者连续或半连续地除去部分 将其除去与另外的钙成分(例如石灰乳)混合,得到5.5〜6.8的pH值,进一步搅拌10〜60分钟, 将所得的过程粒度的磷酸二钙酸酐滤出并干燥。
    • 23. 发明授权
    • Process for the dearsenification of polyphosphoric acid
    • 多磷酸脱砷方法
    • US4399114A
    • 1983-08-16
    • US402941
    • 1982-07-29
    • Alexander MaurerGero HeymerMarkus Erpenbach
    • Alexander MaurerGero HeymerMarkus Erpenbach
    • C01B25/24C01B25/16
    • C01B25/24
    • The disclosure relates to a process for the continuous dearsenification of polyphosphoric acid with the aid of hydrogen sulfide in a gas admission zone. To this end, the disclosure provides for the acid to be dearsenified in a gas admission zone subdivided so as to comprise at least two separate liquid matter-receiving zones, each zone being separated from the other by means of a separate gas zone; for the liquid in each of the liquid matter-receiving zones to be maintained at a level 0.1 up to 10 cm high, without admission of gas; for hydrogen sulfide which remained unreacted in the individual liquid matter-receiving zones to be collected in the respective gas zone and for it to be finely redispersed in the liquid matter-receiving zone directly upstream of the respective gas zone by allowing the hydrogen sulfide to flow through a plurality of openings into the acid, the latter being delivered from the respective liquid-matter-receiving zone into the next downstream liquid-matter-receiving zone, and introduced thereinto directly below the liquid matter level therein; for precipitated arsenic sulfide to be separated from the acid coming from the lower end of the gas admission zone, and for the filtrate obtained to be freed from gaseous hydrogen sulfide in excess.
    • 本公开涉及在气体入口区借助硫化氢连续脱砷多磷酸的方法。 为此,本公开内容提供了在气体进入区域中进行脱砷的酸,其被细分为包括至少两个分离的液体物质接收区域,每个区域通过单独的气体区域与另一个区域分离; 使每个液体物质接收区域中的液体保持在0.1至10厘米高的水平,而不允许气体; 对于在各个液体物质接收区中保持未反应的硫化氢,其被收集在各个气体区中,并且通过允许硫化氢流动直接在各个气体区的上游被精细地再分散在液体物质接收区中 通过多个开口进入酸,后者从相应的液体接收区输送到下一个下游液体接收区,并直接在其中引入液体物质的下方; 使沉淀的硫化砷与气体入口区的下端的酸分离,得到的过滤得到的无水硫化氢的滤液。
    • 27. 发明授权
    • Production of an anticorrosive pigment on phosphate basis
    • 以磷酸盐为基础生产防腐颜料
    • US4294621A
    • 1981-10-13
    • US141135
    • 1980-04-16
    • Alexander MaurerRenate AdrianKlaus HestermannGero Heymer
    • Alexander MaurerRenate AdrianKlaus HestermannGero Heymer
    • C09D5/08C01B25/32C09C1/00C09C1/02C08K3/10
    • C01B25/322C01B25/325C09C1/02C01P2004/61C01P2006/12
    • The invention relates to the production of phosphorus-containing anticorrosive pigments with a particle size of at most 20 microns by reacting one or more calcium or magnesium compounds with phosphoric acid or acid alkali metal or ammonium phosphates by intimately mixing an aqueous suspension or solution of the reactants inside a dispersing means rotating at a speed of 3000 to 10,000 rpm. More particularly, fine pulverulent calcium and magnesium compounds are converted, with agitation, together with water and, if desired, a water-soluble alkanol to a homogeneous suspension or solution. The suspension or solution is intimately mixed, inside the dispersing means at 0.degree. to 40.degree. C. and in an approximately stoichiometric ratio, with the phosphoric acid or acid phosphate solution. Resulting and precipitated pigment is separated and dried under mild conditions while maintaining its content of water of crystallization. The anticorrosive pigment is comprised of a homogeneous mixture and/or mixed crystals of which 10 to 95 mol % is calcium hydrogen phosphate dihydrate, the balance being magnesium hydrogen phosphate trihydrate. An at least 55 weight % proportion consists of particles with a size of up to 5 microns with a BET-surface of at least 1 m.sup.2 /g.
    • 本发明涉及通过使一种或多种钙或镁化合物与磷酸或酸性碱金属或铵磷酸盐反应,通过将下列物质的水性悬浮液或溶液紧密混合,从而生产粒径至多为20微米的含磷防腐颜料 分散装置内的反应物以3000至10,000rpm的速度旋转。 更具体地,精细的粉末状钙和镁化合物在搅拌下与水一起转化,如果需要,将水溶性链烷醇转化成均匀的悬浮液或溶液。 悬浮液或溶液在分散装置内在0℃至40℃下以大约化学计量比与磷酸或酸式磷酸盐溶液紧密混合。 将所得沉淀的颜料分离并在温和条件下干燥,同时保持其结晶水含量。 防腐颜料由均匀的混合物和/或其中10〜95摩尔%为磷酸氢钙二水合物的混合晶体组成,余量为磷酸氢二氢钙三水合物。 至少55重量%的比例由尺寸高达5微米,BET表面至少为1m 2 / g的颗粒组成。