公开(公告)号：US4208389A

公开(公告)日：1980-06-17

申请号：US9912

申请日：1979-02-06

申请人： Yoichi Hiraga ,  Mitsuo Kikuchi

发明人： Yoichi Hiraga ,  Mitsuo Kikuchi

IPC分类号： C01B25/235 ,  C01B25/46 ,  C01B25/22

CPC分类号： C01B25/461 ,  C01B25/235 ,  C01B25/462

摘要： Wet process phosphoric acid prepared by treating phosphate rock with sulfuric acid is purified by extracting said wet process phosphoric acid with an organic solvent containing an equilibrium concentration of phosphoric acid in a first extraction section such that substantial extraction of phosphoric acid from said wet process phosphoric acid is prevented while the organic impurities in said wet process phosphoric acid are substantially extracted and under conditions which prohibit significant extraction of iron impurities into said solvent extractant, extracting the extracted wet process phosphoric acid of reduced organic impurity content with an organic solvent in a second extraction section, returning a portion of the solvent from the second extraction section to the solvent extraction phase of the first section, removing the organic impurities from the solvent phase which is obtained from the first extraction section, and returning at least a portion of the solvent from which the organic impurities have been removed to said second extraction section.

摘要翻译： 通过用硫酸处理磷酸盐岩制备的湿法磷酸通过在第一提取部分中用含有平衡磷酸平衡浓度的有机溶剂萃取所述湿法磷酸来纯化，使得从所述湿法磷酸中大量萃取磷酸 防止所述湿法磷酸中的有机杂质被基本提取，并且在禁止将铁杂质显着提取到所述溶剂萃取剂中的条件下，在第二次萃取中用有机溶剂提取萃取的湿法磷酸有机杂质含量 将一部分溶剂从第二提取部分返回到第一部分的溶剂萃取相，从第一提取部分获得的溶剂相中除去有机杂质，并将至少一部分溶剂从 哪个o 有机杂质已被去除到所述第二提取部分。

公开(公告)号：US4044108A

公开(公告)日：1977-08-23

申请号：US695310

申请日：1976-06-11

申请人： Mitsuo Kikuchi ,  Yoichi Hiraga

发明人： Mitsuo Kikuchi ,  Yoichi Hiraga

IPC分类号： C01B25/237 ,  C01B25/234 ,  C01B25/16

CPC分类号： C01B25/234

摘要： A process for removing organic material from extracted phosphoric acid comprises contacting extracted phosphoric acid with a chlorate and hydrochloric acid at a temperature higher than 100.degree. C while maintaining the concentration of the extracted phosphoric acid at a value higher than 90 wt% as H.sub.3 PO.sub.4. Hydrochloric acid may also be included with the chlorate.

摘要翻译： 从提取的磷酸中除去有机物的方法包括在高于100℃的温度下将提取的磷酸与氯酸盐和盐酸接触，同时保持提取的磷酸的浓度高于作为H 3 PO 4的90重量％的值。 盐酸也可能含有盐酸。

公开(公告)号：US4169881A

公开(公告)日：1979-10-02

申请号：US851411

申请日：1977-11-14

申请人： Mitsuo Kikuchi ,  Yoichi Hiraga

发明人： Mitsuo Kikuchi ,  Yoichi Hiraga

IPC分类号： C01B25/237 ,  C01B25/46 ,  C01B25/16

CPC分类号： C01B25/461 ,  C01B25/2372 ,  C01B25/462

摘要： A method of purifying extracted phosphoric acid containing substantially no metallic impurities which comprises:(a) adjusting the phosphoric acid concentration to from 20 to 65 wt.% as P.sub.2 O.sub.5,(b) adjusting the Si/F atomic ratio in said extracted phosphoric acid to less than 0.2; and(c) contacting said extracted phosphoric acid with silica gel at a temperature of 20.degree.-100.degree. C. to remove the dissolved silica from said extracted phosphoric acid; and(d) recovering extracted phosphoric acid having a reduced silica content.

公开(公告)号：US4154805A

公开(公告)日：1979-05-15

申请号：US842251

申请日：1977-10-14

申请人： Yoichi Hiraga ,  Mitsuo Kikuchi

发明人： Yoichi Hiraga ,  Mitsuo Kikuchi

IPC分类号： C01B25/234 ,  C01B25/16

CPC分类号： C01B25/234

摘要： Wet process phosphoric acid prepared by treating phosphate rock with sulfuric acid and separating calcium sulfate, is purified to obtain a purified phosphoric acid by (a) an acid extracting section contacting the wet process phosphoric acid and a phosphoric acid solution containing impurities obtained in the scrubbing section with an organic solvent in the presence of the hydrochloric acid required for extracting a substantial amount of the phosphoric acid component; (b) a scrubbing section contacting the extract obtained in the acid extracting section with aqueous phosphoric acid or water while maintaining the chloride ion concentration in the aqueous phase in the range of 20 to 40 g/liter as Cl; (c) an acid stripping section contacting the purified extract obtained in the scrubbing section with water and (d) an adsorbing section contacting the extracted phosphoric acid obtained in the acid stripping section with an anion-exchange resin.

摘要翻译： 通过用硫酸处理磷酸盐岩和分离硫酸钙制备的湿法磷酸，通过（a）与湿法磷酸接触的酸提取部分和在洗涤中获得的含杂质的磷酸溶液进行纯化，得到纯化的磷酸 在提取大量磷酸组分所需的盐酸存在下用有机溶剂进行切片; （b）将酸提取部中得到的提取物与磷酸水溶液接触，同时将水相中的氯离子浓度保持在20〜40g /升的范围内的洗涤部分作为Cl; （c）将洗涤部分中得到的纯化提取物与水接触的酸性汽提部分和（d）与酸性汽提部分中得到的提取的磷酸接触的吸附部分与阴离子交换树脂。

公开(公告)号：US4070443A

公开(公告)日：1978-01-24

申请号：US698710

申请日：1976-06-22

申请人： Mitsuo Kikuchi ,  Yoichi Hiraga

发明人： Mitsuo Kikuchi ,  Yoichi Hiraga

IPC分类号： C01B25/234 ,  C01B25/16

CPC分类号： C01B25/234

摘要： A process for removing sulfate ions from extracted phosphoric acid which is substantially free of metallic ion impurities and which has been prepared by extracting wet process phosphoric acid with an organic solvent which comprises:A. adjusting the extracted phosphoric acid concentration to a concentration greater than 70%;B. adding an amount of a barium compound which is less than the stoichiometric equivalent amount of barium relative to the amount of dissolved sulfate ion to form barium sulfate crystals; andC. separating said barium sulfate from the resulting slurry at a temperature less than 80.degree. C and recovering purified, extracted phosphoric acid;Wherein the amount of barium compound added is such that said purified extracted phosphoric acid contains at least 5 ppm of sulfate ions.

摘要翻译： 从基本上不含金属离子杂质的提取的磷酸中除去硫酸根离子的方法，其通过用有机溶剂萃取湿法磷酸制备，该方法包括：

公开(公告)号：US4041134A

公开(公告)日：1977-08-09

申请号：US695309

申请日：1976-06-11

申请人： Mitsuo Kikuchi ,  Yoichi Hiraga

发明人： Mitsuo Kikuchi ,  Yoichi Hiraga

IPC分类号： C01B25/237 ,  C01B25/234 ,  C01B25/16

CPC分类号： C01B25/234

摘要： A process for removing sulfate ions from extracted phosphoric acid which is substantially free of metallic ion contaminants, which comprises adding less than the stoichiometric equivalent of a barium compound relative to the amount of dissolved sulfate ion to said extracted phosphoric acid to form barium sulfate crystals, adding active carbon to the resulting slurry, separating the solid components from the slurry and recovering purified phosphoric acid.

摘要翻译： 从基本上不含金属离子污染物的提取的磷酸中除去硫酸根离子的方法，其包括相对于所述提取的磷酸溶解的硫酸根离子的量少于化学计量当量的钡化合物以形成硫酸钡晶体， 向所得浆料中加入活性炭，将固体组分与浆料分离并回收纯化的磷酸。

公开(公告)号：US4431504A

公开(公告)日：1984-02-14

申请号：US373717

申请日：1982-04-30

申请人： Toru Seita ,  Takao Satoh ,  Mitsuo Kikuchi

发明人： Toru Seita ,  Takao Satoh ,  Mitsuo Kikuchi

IPC分类号： C25B13/08 ,  B01J47/12 ,  C08J5/22 ,  C25B1/46

CPC分类号： C25B1/46 ,  C08J5/2281 ,  C08J2327/12

摘要： A cation-exchange membrane for electrolyzing an aqueous solution of an alkali metal halide in the manufacture of an alkali hydroxide and a halogen. The membrane comprises one layer which occupies 5 to 30% of the total thickness of the membrane and has carboxylic acid groups; another layer which occupies 5 to 30% of the membrane thickness and has weakly acidic groups, the weakly acidic groups occupying 10 to 60% of the total exchange group capacity of the layer; and a further layer which has sulfonic acid groups occupying the middle portion of the membrane.

摘要翻译： 一种用于在碱金属氢氧化物和卤素的制造中电解碱金属卤化物的水溶液的阳离子交换膜。 该膜包含占层膜厚度的5〜30％的一层，具有羧酸基团; 占层膜厚度的5〜30％，弱酸性基团，弱酸性基团占该层总交换容量的10〜60％; 以及具有占据膜的中间部分的磺酸基团的另外的层。

公开(公告)号：US4248848A

公开(公告)日：1981-02-03

申请号：US16981

申请日：1979-03-02

申请人： Tsugio Murakami ,  Mitsuo Kikuchi ,  Kazushige Igawa

发明人： Tsugio Murakami ,  Mitsuo Kikuchi ,  Kazushige Igawa

IPC分类号： C01B11/06 ,  C01B11/04 ,  C01F11/44

CPC分类号： C01B11/064

摘要： A dihydrate of calcium hypochlorite of a prismatic crystal shape in which the lengths of axes a, b and c thereof are in the ratios satisfying the following formulas (1), (2) and (3):0.5.ltoreq.b/a.ltoreq.2.0 (1)c/a.gtoreq.1.5 (2)c.gtoreq.5.mu. (3)and a method for the manufacture of the prismatic dihydrate. Further a method for the manufacture of a coarse dihydrate of calcium hypochlorite carried out by using the prismatic dihydrate of calcium hypochlorite as seed crystal.

摘要翻译： 其中轴a，b和c的长度为满足下列公式（1），（2）和（3）的比例为0.5≤b/ a的方形晶体形式的次氯酸钙的二水合物， / = 2。

公开(公告)号：US4693796A

公开(公告)日：1987-09-15

申请号：US792629

申请日：1985-10-25

申请人： Toru Seita ,  Takao Satoh ,  Mitsuo Kikuchi

发明人： Toru Seita ,  Takao Satoh ,  Mitsuo Kikuchi

IPC分类号： C08J5/22 ,  C25B1/14 ,  C25B1/00 ,  C25B13/00

CPC分类号： C08J5/2281 ,  C08J2327/18

摘要： A cation exchange membrane manufacturing method in which a film of a blend which consists of a perfluoro carbon polymer having a group transformable into a sulfonic acid group and a perfluoro carbon polymer having a group transformable into a carboxylic acid group or a film of a copolymer which consists of a perfluoro carbon monomer having a group transformable into a sulfonic acid group and a perfluoro carbon monomer having a group transformable into a carboxylic acid group and another film of a perfluoro carbon polymer having a group transformable into a carboxylic acid group are joined together. Following that, the group transformable into a carboxylic acid group and the group transformable into a sulfonic acid group are transformed respectively into the carboxylic acid group and the sulfonic acid group.

摘要翻译： 一种阳离子交换膜的制造方法，其中由具有可转化成磺酸基团的全氟碳聚合物和具有可转化成羧酸基团的全氟碳聚合物组成的共混物膜或共聚物膜 由具有可转化成磺酸基团的全氟碳单体和具有可转化成羧酸基的基团的全氟碳单体和具有可转化成羧酸基团的全氟碳聚合物的另一膜组合在一起。 之后，可转化成羧酸基团和可转化成磺酸基团的基团分别转化成羧酸基团和磺酸基团。

公开(公告)号：US4316781A

公开(公告)日：1982-02-23

申请号：US192543

申请日：1980-09-30

申请人： Toru Seita ,  Takao Satoh ,  Mitsuo Kikuchi

发明人： Toru Seita ,  Takao Satoh ,  Mitsuo Kikuchi

IPC分类号： C25B1/46 ,  C25B9/00 ,  C25B9/08 ,  C25B13/08 ,  C25B1/34

CPC分类号： C25B1/46

摘要： An improved method for electrolyzing alkali metal halide. Electrolysis is carried out by supplying an aqueous solution of a halide of alkali metal into an anode chamber partitioned by a cation-exchange membrane and water into a cathode chamber to obtain halogen from the anode chamber and hydrogen and alkali hydroxide from the cathode chamber. The cation-exchange membrane is a fluorocarbon polymer membrane which is prepared by arranging one side thereof to have a cation exchange group concentration lower by 10 to 30% within a depth range of 1 to 100.mu. than that of the other side. The anode chamber is prepared with this side of the membrane which has the lower cation exchange group concentration arranged to face the anode chamber. By this arrangement, a high purity alkali hydroxide can be manufactured at a high rate of decomposition of halide of alkali metal and at a high current efficiency.

摘要翻译： 一种电解碱金属卤化物的改进方法。 通过将由阳离子交换膜和水分隔的阳极室供给碱金属卤化物的水溶液进入阴极室，从阳极室获得卤素，从阴极室供给氢和碱金属氢氧化物，进行电解。 阳离子交换膜是氟碳聚合物膜，其通过将其一侧的阳极交换基团浓度设定为比另一侧的1〜100μm的深度范围低10〜30％来制备。 阳极室由阳离子交换剂浓度较低的膜的这一侧制成，以面对阳极室。 通过这种布置，可以以高碱性金属的卤化物的高分解率和高电流效率制造高纯碱性氢氧化物。