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11. 发明授权

US4134962A Production of pure alkali metal phosphate solutions from wet-processed phosphoric acids 失效
标题翻译：从湿法磷酸生产纯碱金属磷酸盐溶液
公开(公告)号：US4134962A
公开(公告)日：1979-01-16
申请号：US771167
申请日：1977-02-23
申请人： Klaus-Peter Ehlers , Gero Heymer
发明人： Klaus-Peter Ehlers , Gero Heymer
IPC分类号： C01B25/30 , C01B15/16 , C01B25/16 , C01B25/26
CPC分类号： C01B25/303
摘要： Alkali metal phosphate solutions (alkali metal oxide : P.sub.2 O.sub.5 - molar ratio greater than 1.9 : 1) of reduced vanadium and chromium contents are made from wet-processed phosphoric acids which are neutralized by means of an alkali metal hydroxide and/or carbonate. The alkali metal phosphate solutions contain less than 20 ppm of vanadium and less than 1 ppm of chromium and are made by stepwise neutralization. More specifically the acid is neutralized in a first step to an alkali metal oxide to P.sub.2 O.sub.5 - molar ratio of 1.0 : 1 to 1.8 : 1; resulting precipitate is separated and resulting solution is admixed with iron(II)salt at 60 to 90.degree. C. Next, the acid is neutralized in a second step to an alkali metal oxide to P.sub.2 O.sub.5 - molar ratio greater than 1.9 : 1, and resulting precipitate is separated again.
摘要翻译：还原的钒和铬含量的碱金属磷酸盐溶液（碱金属氧化物：P2O5 - 大于1.9:1的摩尔比）由湿法处理的磷酸制成，这些磷酸通过碱金属氢氧化物和/或碳酸盐中和。碱金属磷酸盐溶液含有小于20ppm的钒和小于1ppm的铬，并且通过逐步中和制备。更具体地，将酸在第一步中中和至碱金属氧化物至P2O5-摩尔比为1.0:1至1.8:1; 分离得到的沉淀物，得到的溶液与铁（II）盐在60至90℃下混合。接下来，将酸在第二步中中和至碱金属氧化物至P2O5-摩尔比大于1.9:1，得到沉淀再次分离。

12. 发明授权

US4100261A Production of pure alkali metal phosphate solutions from wet-processed phosphoric acid 失效
标题翻译：从湿法磷酸生产纯碱金属磷酸盐溶液
公开(公告)号：US4100261A
公开(公告)日：1978-07-11
申请号：US640772
申请日：1975-12-15
申请人： Klaus-Peter Ehlers , Siegfried Lischka , Siegfried Burkhardt
发明人： Klaus-Peter Ehlers , Siegfried Lischka , Siegfried Burkhardt
IPC分类号： C01B25/30 , C01B15/16 , C01B25/26
CPC分类号： C01B25/303
摘要： Production of pure alkali metal phosphate solutions by neutralizing wet-processed phosphoric acid with an alkali liquor and/or carbonate. To this end, the wet-processed phosphoric acid is neutralized to a pH from 4 to 9, the resulting neutralization sludge consisting substantially of insoluble aluminum and iron phosphates is separated from the alkali metal phosphate solution and scrubbed with water, the sludge so treated is mixed with alkali liquor, alkali metal phosphate solution and water-glass so as to establish in the resulting suspension a molar ratio of SiO.sub.2 to Al.sub.2 O.sub.3 of at least 2 : 1 and a molar ratio of dissolved alkali metal oxide to dissolved P.sub.2 O.sub.5 ranging from 2.9 : 1 to 3.3 : 1, the whole is heated to temperatures from 80.degree. to 100.degree. C to effect breakup of the sludge in the suspension with the resultant formation of a solid matter residue together with a trialkali metal phosphate solution, the solid matter residue is separated from the trialkali metal phosphate solution, water-scrubbed, and discarded. More particularly, crude wet-processed phosphoric acid containing more than 45 weight % of P.sub.2 O.sub.5 is diluted with a portion of the scrubbing water obtained during operation and its P.sub.2 O.sub.5 -content is thereby reduced down to 30 to 45 weight %. The acid so treated is neutralized with an alkali liquor and/or carbonate and with the trialkali metal phosphate solution originating from the processed neutralization sludge.
摘要翻译：通过用碱液和/或碳酸盐中和湿法磷酸制备纯碱金属磷酸盐溶液。为此，湿法处理的磷酸被中和至4至9的pH，所得到的基本上由不溶性铝和磷酸铁组成的中和污泥与碱金属磷酸盐溶液分离并用水洗涤，如此处理的污泥为与碱液，碱金属磷酸盐溶液和水玻璃混合，以在所得悬浮液中建立SiO 2与Al 2 O 3的摩尔比至少为2:1，溶解的碱金属氧化物与溶解的P2O5的摩尔比为2.9:1， 1〜3.3:1，全部加热至80〜100℃，使悬浮液中的污泥分解，形成固体物质残留物和三碱金属磷酸盐溶液，固体残渣为与三碱金属磷酸盐溶液分离，水洗涤并弃去。更具体地，含有大于45重量％的P 2 O 5的粗制湿法磷酸用操作中获得的一部分洗涤水稀释，并且其P2O5含量因此降低至30至45重量％。如此处理的酸被碱液和/或碳酸盐中和，并且来源于经处理的中和污泥的三碱金属磷酸盐溶液。

13. 发明授权

US3996336A Purification of phosphoric acid 失效
标题翻译：磷酸的纯化
公开(公告)号：US3996336A
公开(公告)日：1976-12-07
申请号：US592188
申请日：1975-07-01
申请人： Bernhard Wojtech , Klaus-Peter Ehlers , Wolfgang Scheibitz
发明人： Bernhard Wojtech , Klaus-Peter Ehlers , Wolfgang Scheibitz
IPC分类号： C01B25/234 , C01B25/18 , C01B25/46 , C01B25/16
CPC分类号： C01B25/18 , C01B25/464
摘要： Phosphoric acid is purified. To this end, it is dissolved in an organic solvent completely miscible with water. More particularly, the phosphoric acid is mixed with a solvent having a boiling point higher than that of water or higher than that of the resulting azeotrope; the resulting solution is heated to temperatures between the boiling point of water or the azeotrope and that of the solvent for as long a period as necessary to distillatively free the solution from the bulk of uncombined water therein; and the phosphoric acid solution is separated from residue.
摘要翻译：纯化磷酸。为此，将其溶解在与水完全混溶的有机溶剂中。更具体地说，将磷酸与沸点高于水或高于所得共沸物的溶剂混合; 将所得溶液加热到水或共沸物的沸点与溶剂沸点之间的温度长达一段时间，以将溶液从其中的大部分未混合水蒸馏出来; 并将磷酸溶液与残留物分离。

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