发明名称 |
СПОСОБ ОЧИСТКИ ЭКСТРАКЦИОННОЙ ФОСФОРНОЙ КИСЛОТЫ |
摘要 |
FIELD: inorganic chemistry, chemical technology. ^ SUBSTANCE: invention relates to a method for preparing phosphoric acid with the low content of impurities used in manufacture of phosphates of technical and food grading. Method for treatment of wet-process phosphoric acid involves step-by-step extraction of phosphoric acid with tributyl phosphate in the volume ratio of organic and aqueous phases = (2.5-5.5):1 and aqueous re-extraction up to preparing the manufacturing acid and these steps are carried out with formation of emulsion in pulse-regimen and separation of aqueous and organic phases also after each stage. Method involves feeding wet-process phosphoric acid wherein compounds are added that comprise alkaline metal ions or ammonium ion taken in the amount necessary for reducing sulfuric acid in it up to 0.002-0.005 p/p P2O5. Number of extraction steps is varied so to provide the concentration of phosphoric acid in formed extract to be equal 12-16% of P2O5. It is possible to carry out this method using stage for extract washing out. For extraction acid is fed with the concentration 48-62% of P2O5 and as compounds containing ammonium ion ammonia is used and its derivatives of ammonium phosphate. Number of steps in extraction process is varied in the range = 1-4. Method provides enhancing treatment degree of wet-process phosphoric acid from sulfuric acid in simultaneous elevating the yield of product. ^ EFFECT: improved treatment method. ^ 4 cl, 1 tbl, 2 ex |
申请公布号 |
RU2003121591(A) |
申请公布日期 |
2005.02.10 |
申请号 |
RU20030121591 |
申请日期 |
2003.07.16 |
申请人 |
Открытое акционерное общество "Научно-Исследовательский институт по удобрени м и инсектофунгицидам им. проф. Я.В. Самойлова" (ОАО "НИУИФ") (RU) |
发明人 |
Гриневич Анатолий Владимирович (RU);Левин Борис Владимирович (RU);Мошкова Валентина Григорьевна (RU);Корнева Зинаида Николаевна (RU);Токмакова Тать на Васильевна (RU) |
分类号 |
C01B25/46 |
主分类号 |
C01B25/46 |
代理机构 |
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代理人 |
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地址 |
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