SU1567655A1 - Method of obtaining solutions of sodium (vi) ferrate - Google Patents

Method of obtaining solutions of sodium (vi) ferrate Download PDF

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Publication number
SU1567655A1
SU1567655A1 SU884464681A SU4464681A SU1567655A1 SU 1567655 A1 SU1567655 A1 SU 1567655A1 SU 884464681 A SU884464681 A SU 884464681A SU 4464681 A SU4464681 A SU 4464681A SU 1567655 A1 SU1567655 A1 SU 1567655A1
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SU
USSR - Soviet Union
Prior art keywords
ferrate
sodium
concentration
solution
solutions
Prior art date
Application number
SU884464681A
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Russian (ru)
Inventor
Николай Семенович Копелев
Юрий Михайлович Киселев
Нина Александровна Завьялова
Юрий Никитич Козлов
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МГУ им.М.В.Ломоносова
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Priority to SU884464681A priority Critical patent/SU1567655A1/en
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Publication of SU1567655A1 publication Critical patent/SU1567655A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/0018—Mixed oxides or hydroxides
    • C01G49/0081—Mixed oxides or hydroxides containing iron in unusual valence state [IV, V, VI]

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Compounds Of Iron (AREA)

Abstract

Изобретение относитс  к способам получени  феррата (VI) натри  , который может быть использован дл  очистки сточных вод в качестве ингибиторакоррозии сплавов на основе железа и позвол ет повысить концентрацию феррата (VI) натри  в растворе за счет использовани  в известном способе получени  феррата (VI) натри  анобным растворением металлического железа в растворе гидрооксида натри  при анобном растворении при плотности тока 0,1-0,5 А/см2 в растворе гидроксида натри  с концентрацией 17-20 М при температуре 70-85°С.The invention relates to methods for producing sodium ferrate (VI), which can be used to treat wastewater as an inhibitor of corrosion of iron-based alloys and to increase the concentration of sodium ferrate (VI) in solution by using sodium ferrate (VI) in a known process. by anobic dissolution of metallic iron in a solution of sodium hydroxide with anobic dissolution at a current density of 0.1-0.5 A / cm 2 in a solution of sodium hydroxide with a concentration of 17-20 M at a temperature of 70-85 ° C.

Description

Изобретение относитс  к способам получени  растворов феррата (VI) натри , которые могут быть использованы дл  очистки сточных иод и отход щих газов промышленных производств, как ингибиторы коррозии сплавов на основе железа и т.д.The invention relates to methods for producing solutions of sodium ferrate (VI), which can be used to purify waste iodine and waste gases of industrial plants, as corrosion inhibitors of iron-based alloys, etc.

Целью изобретени   вл етс  повышение концентрации полученного раст- ,вора феррата (VI) натри .The aim of the invention is to increase the concentration of the obtained sodium plant, ferrite (VI) ferrite.

Отличительными признаками предлагаемого способа  вл етс  использование растворов NaOH концентрации 17- 20 моль/л (концентраци  NaOH примерно соответствует насыщенному раствору ) , плотностей анодного тока 0,1- 0,5 А/см5 и проведение электролиза при температуре анолита 70-85 С.Distinctive features of the proposed method are the use of NaOH solutions with a concentration of 17-20 mol / l (the concentration of NaOH approximately corresponds to a saturated solution), anode current densities of 0.1-0.5 A / cm5 and electrolysis at an anolyte temperature of 70-85 C.

Указанна  цель не достигаетс  в случае проведени  электролиза в щелочных растворах, содержащих менее 17 моль/л NaOH. При NaOH 17 моль/л происходит существенное понижениеThis goal is not achieved in the case of electrolysis in alkaline solutions containing less than 17 mol / l NaOH. When NaOH 17 mol / l there is a significant decrease

концентрации феррата (Vi) в рагтво;е до 0,02 моль/л.the concentration of ferrate (Vi) in the formula; e to 0.02 mol / l.

В случае выхода за нижний пропел указанного интервала значений плотности тока на аноде также проис одт понижение концентрации феррит: (VI до уровн  прототипа. Прч ,5 А/см получить растворы феррата (VI) не представл етс  возможным, поскольку в этом случае соединени  Fe гаютс  вследствие локального грева, в приэлектродном простансч- , ве, по-видимому, затруднен теплообмен ввиду высокой в зкости концентрированных растворов NaOH.In case of going beyond the lower propel of the indicated range of current density values at the anode, the ferrite concentration also decreases: (VI to the prototype level. Ex. 5 A / cm to obtain solutions of ferrate (VI) is not possible, because in this case the compounds F due to localized heat, in the electrode prostance, the heat exchange seems to be hampered due to the high viscosity of concentrated NaOH solutions.

В случае проведени  электролиза при температуре, выход щей за рамки указанного интервала, поставленна  цель не достигаетс . В случае Т Ј 70 С концентраци  феррата (VI) в рае-воре не превышает уровн  прототипа. НесС- ходимость поддержани  температуры анолита в интервале 70 - 85°С обьж - н етс  тем, что диффузионные nr uu-.In the case of electrolysis at a temperature outside the specified interval, the goal is not achieved. In the case of T Ј 70 C, the concentration of ferrate (VI) in a raze-thief does not exceed the level of the prototype. The incompatibility of maintaining the anolyte temperature in the range of 70 - 85 ° C is due to the fact that diffusion nr uu-.

с:with:

г,g,

СПSP

ОABOUT

о елabout ate

СпSp

сы, обеспечивающие образование ионов Fe044, ускор ютс  при нагревании. Наличие верхнего температурного предела обусловлено термической неустойчивостью растворов ферратов (VI), которые разлагаютс  с образов нием соединений Fe .Sols, which provide the formation of Fe044 ions, are accelerated by heating. The presence of the upper temperature limit is due to the thermal instability of solutions of ferrates (VI), which decompose with the formation of Fe compounds.

Пример 1. Анодное растворение железа провод т в электролизере, изготовленном из полиэтилена и фторопластов , диафрагмой служит перфорированна  пленка из фторопласта. Анодом служит пластина из трансформаторной стали площадью 10 см , катодом - серебр на  полоска. Электролитом служит водный, насыщенный при комнатной температуре раствор NaOH (tNaOHj 20 моль/л). На электроды подают посто нный ток. Систему регулируют так, чтобы плотность тока на аноде составл ла 0,5 Л/см . Электролизер помещают в вод ную баню, нагретую до 75 С, температура анолита также 75 С. Электролиз провод т в течение 20 мцн. В результате получаютс  растворы ферра- та (VI) (наличие соединений FeVl и от-4 сутствие примесей, например соединеExample 1. Anodic dissolution of iron is carried out in an electrolytic cell made of polyethylene and fluoroplastics; the diaphragm is a perforated film of fluoroplastic. The anode is a plate of transformer steel with an area of 10 cm, the cathode is silver on a strip. The electrolyte is an aqueous solution of NaOH saturated at room temperature (tNaOHj 20 mol / l). A constant current is applied to the electrodes. The system is adjusted so that the current density at the anode is 0.5 L / cm. The electrolyzer is placed in a water bath heated to 75 ° C, the anolyte temperature is also 75 ° C. The electrolysis is carried out for 20 mc. As a result, solutions of ferrate (VI) are obtained (the presence of FeVl compounds and, due to the absence of impurities, for example

ний Fe Ilower fe i

в щелочной Среде доказаноproven in alkaline environment

5 five

5five

00

методами химического анализа, мессба- уэровской и электронной спектроскопии) концентрации 0,096 моль/л. Результаты других экспериментов, проведенных дл  определени  условий осуществлени  предлагаемого способа, представлены в таблице.methods of chemical analysis, Mössbauer and electron spectroscopy) concentration of 0.096 mol / l. The results of other experiments conducted to determine the conditions for the implementation of the proposed method are presented in the table.

Claims (1)

Таким образом, предложенный способ по сравнению с прототипом (концентраци  феррата 0,02 моль) позвол ет увеличить концентрацию феррата (VI) в растворе, освободитьс  от примесей соединений Fe и различных солей натри , а также заметно уменьшить врем  синтеза растворов феррата (VI). Формула изобретени Thus, the proposed method compared with the prototype (ferrate concentration of 0.02 mol) allows to increase the concentration of ferrate (VI) in solution, to free from impurities of Fe compounds and various sodium salts, and also significantly reduce the time of synthesis of ferrate (VI) solutions. Invention Formula Способ получени  растворов феррата (VI) натри  анодным растворением металлического железа в растворе гид- роксида натри  при нагревании, о т- личающийс  тем, что, с целью повышени  концентрации получаемого раствора феррата (VI) натри , анодное растворение ведут при плотности тока 0,1-0,5 А/см в растворе гидроксида натри  с концентрацией 17-20 М при температуре 70-85 С.The method of obtaining solutions of sodium ferrate (VI) by anodic dissolution of metallic iron in a solution of sodium hydroxide when heated, in order to increase the concentration of the resulting solution of sodium ferrate (VI), anodic dissolution is carried out at a current density of 0.1 -0.5 A / cm in a solution of sodium hydroxide with a concentration of 17-20 M at a temperature of 70-85 C. В этом случае растворы феррата (VI) вследствие их разложени  загр знены примес ми соединений Fe1.In this case, the solutions of ferrate (VI) due to their decomposition are contaminated with impurities of Fe1 compounds.
SU884464681A 1988-07-20 1988-07-20 Method of obtaining solutions of sodium (vi) ferrate SU1567655A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003072852A3 (en) * 2002-02-27 2004-02-12 Lynntech Inc Electrochemical method for producing ferrate (vi) compounds
US7314552B2 (en) 2002-02-27 2008-01-01 Lynntech, Inc. Electrochemical method and apparatus for producing and separating ferrate(VI) compounds
CN100427644C (en) * 2005-07-15 2008-10-22 复旦大学 Direct electrochemical process of preparing ferrate
RU196524U1 (en) * 2019-10-03 2020-03-03 Общество с ограниченной ответственностью «Экотех» DEVICE FOR PRODUCING ALKALINE SOLUTION FERRAT (VI) SODIUM

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ЖОХ, т. 7, 1937, с.1690-1694. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003072852A3 (en) * 2002-02-27 2004-02-12 Lynntech Inc Electrochemical method for producing ferrate (vi) compounds
US7045051B2 (en) 2002-02-27 2006-05-16 Lynntech, Inc. Electrochemical method for producing ferrate(VI) compounds
US7314552B2 (en) 2002-02-27 2008-01-01 Lynntech, Inc. Electrochemical method and apparatus for producing and separating ferrate(VI) compounds
CN100427644C (en) * 2005-07-15 2008-10-22 复旦大学 Direct electrochemical process of preparing ferrate
RU196524U1 (en) * 2019-10-03 2020-03-03 Общество с ограниченной ответственностью «Экотех» DEVICE FOR PRODUCING ALKALINE SOLUTION FERRAT (VI) SODIUM

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