CS251467B1 - A method for obtaining palladium from wastewater after catalytic hydrogenation of nitrosated derivatives - Google Patents

A method for obtaining palladium from wastewater after catalytic hydrogenation of nitrosated derivatives Download PDF

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CS251467B1
CS251467B1 CS84641A CS64184A CS251467B1 CS 251467 B1 CS251467 B1 CS 251467B1 CS 84641 A CS84641 A CS 84641A CS 64184 A CS64184 A CS 64184A CS 251467 B1 CS251467 B1 CS 251467B1
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wastewater
palladium
catalytic hydrogenation
chemisorbent
derivatives
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CS84641A
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Czech (cs)
Slovak (sk)
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CS64184A1 (en
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Jan Pauko
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Jan Pauko
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Publication of CS251467B1 publication Critical patent/CS251467B1/en

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Abstract

Účelom rešenia je získanie paládia z odpadových vůd po katalytickej hydrogenácii, kde sa paládium nachádza v obzvlášť nízkej koncentrácií v chemicky inertných zlúčeninách. Uvedeného účelu sa dosiahne tak, že pH odpadových vod sa upraví kyselinou na menej ako 7,5 ale viac ako 3 a tieto sa kontaktujú s pevným chemisorbentom pozostávajúcim z aktívneho uhlia a alkalickej soli kyseliny etyléndiamíntetraoctovejThe purpose of the solution is to obtain palladium from wastewater after catalytic hydrogenation, where palladium is found in a particularly low concentration in chemically inert compounds. The stated purpose is achieved by adjusting the pH of the wastewater with acid to less than 7.5 but more than 3 and contacting it with a solid chemisorbent consisting of activated carbon and an alkaline salt of ethylenediaminetetraacetic acid.

Description

Vynález sa týká sposobu získania paládia a z odpadových vod po katalytické] hydrogenácii nitrozoderivátov.The present invention relates to a process for obtaining palladium and wastewater after catalytic hydrogenation of nitrosated derivatives.

Je známe, že pri katalytickej hydrogenácii aromatických nitrozoderivátov sa časť paládia vyplavuje z technologického procesu v alkalických zbytkoch v mnohozložkovej zmesi s organickými a anorganickými látkami v obzválšť nízkej koncentrácii. Známými sposobmi, ako sú: redukcia vodíkom, elektrolytická redukcia, adsorpcia na polárných sorbentoch, adsorpcia na nepolárných sorbentoch a na iontomeničoch — sa získať paládium z týchto odpadov nepodařilo. Toto nasvědčuje tomu, že paládium je v nich viazané v zlúčeninách, ktoré sú chemicky inertně a dá sa předpokládat', že ich stabilitu zvyšujú hydroxóniové ióny. Pravděpodobně sa jedná o polymérne nitrozilchloridy paládia s chlórovými mostikmi.It is known that in the catalytic hydrogenation of aromatic nitrosated derivatives, part of the palladium is washed out of the process in alkaline residues in a multi-component mixture with organic and inorganic substances at a particularly low concentration. Known methods such as: hydrogen reduction, electrolytic reduction, adsorption on polar sorbents, adsorption on non-polar sorbents and on ion exchangers - to obtain palladium from these wastes. This suggests that palladium is bound in them in compounds that are chemically inert and are believed to be enhanced by hydroxonium ions. They are probably polymeric palladium nitrosilchlorides with chlorine bridges.

Podstata získania paládia z odpadových vod po katalytickej hydrogenácii nitrózoderivátov spočívá v tom, že ich pH sa upraví minerálnou kyselinou na menej ako 7,5, ale viac ako 3 a tieto sa kontaktujú s pevným chemisorbentom pozostávajúcim z nosiča — — aktívneho uhlia a zakotvenej fázy — alkalické] soli kyseliny etyléndiamíntetraoctovej.The principle of obtaining palladium from wastewater after catalytic hydrogenation of nitrosated derivatives is that their pH is adjusted to less than 7.5 but more than 3 with mineral acid and these are contacted with a solid chemisorbent consisting of an activated carbon carrier and an anchored phase. alkali salts of ethylenediaminetetraacetic acid.

Hlavná výhoda tohoto sposobu získania paládia z odpadových vod je v tom, že umož- ňuje získať paládium z mnohozložkovej zmesi s organickými a anorganickými látkami, kde sa nachádza v chemicky inertných zlúčeninách v obzvlášť nízkej koncentrácii. PříkladThe main advantage of this method of obtaining palladium from wastewater is that it allows to obtain palladium from a multi-component mixture with organic and inorganic substances, where it is found in chemically inert compounds at particularly low concentration. Example

Odpadové vody použité pri pokuse malí toto zloženie: — cca 80 % hmot. vody — cca 10 % hmot. anorganických látok — cca 6 % hmot. hydroxidu sodného — cca 4 % hmot. organických látok — 7,4 . ÍO-4 % hmot. paládiaThe waste water used in the experiment is small: - about 80% by weight. water - about 10 wt. % of inorganic substances - about 6 wt. sodium hydroxide - about 4 wt. organic matter - 7.4. 10-4 wt. palladium

Do odpadových vód bola přidaná kyselina sírová tak, že výsledné pH zmesi bolo 1,52. Ďalej sa odpadové vody kontaktovali s pevným chemisorbentom, ktorý pozostával z ak tívneho uhlia, na ktoré bolo nanesené 5 % hmot. dvojsodnej soli kyseliny etyléndiamintetraoctovej ako je uvedené v tabulke. Množstvo chemisorbentu bolo 360 ml. Pokus uol vedený tak, že cez kolonu naplnenú týmto chemisorbentom sa kontinuálně dávkovali tieto odpadové vody v rozmedzí pH 1,52 až 7,8 1, rýchlosťou 100 až 149 ml/h..Koncentrúcia vodíkových iónov v odpadových vodách sa počas pokusu upravovala roztokom hydroxidu sodného, ako je uvedené v tabulke.Sulfuric acid was added to the waste water so that the resulting pH of the mixture was 1.52. Furthermore, the effluents were contacted with a solid chemisorbent consisting of activated carbon, to which 5% by weight of the composition was applied. disodium salt of ethylenediaminetetraacetic acid as shown in the table. The amount of chemisorbent was 360 ml. An attempt was made to continuously dispense these effluents over a column filled with this chemisorbent in the pH range of 1.52 to 7.8 L at a rate of 100 to 149 ml / hr. The concentration of hydrogen ions in the effluent was treated with hydroxide solution during the experiment. sodium as indicated in the table.

Poradie pokusu Dávkovanie (ml/hod.J pH Obsah Pd po kontakte s chemisorbentom (% hmot.) 1 100 1,52 0,000030 2 110 1,52 0,000030 3 149 2,56 0,000011 4 149 3,05 0,000009 5 100 3,46 0,000000 6 149 6,24 0,000000 7 149 7,81 0,000430 Z tabulky je zřejmé, že týmto sposobom Tento vynález je možné využiť pri získá- sa získá v rozmedzí pH od 3,46 do 6,24 všet- vainí paládia z odpadových vod vznikajúcich ko paládium obsiahnuté v odpadových vo- pri katalytickej hydrogenácii nitrózoderivá- dách. tov.Sequence of Dosing Dosage (ml / hr pH) Content of Pd after contact with chemisorbent (% w / w) 1,100 1.52 0.000030 2,110 1.52 0.000030 3,149 2.56 0.000011 4,149 3.05 0.000009 5,100 3.46 0.000000 6,149 6.24 0.000000 7,149 7.81 0.000430 It will be appreciated from the table that the present invention can be used to obtain a pH of from 3 to 3. , 46 to 6.24, all of the palladium from the wastewater produced by the palladium contained in the waste water of the catalytic hydrogenation of nitroso derivatives.

Claims (1)

Sposob získania paládia z odpadových vód po katalytickej hydrogenácii nitrózoderivátov vyznačený tým, že pH odpadových vod sa upraví minerálnou kyselinou na menej ako 7,5, ale viac ako 3 a tieto sa kontaktujú s pevným chemisorbentom pozostávajúcim z nosiča tvořeného aktívnym uhlím a zakotvenej fázy tvorenej alkalickou solou kyseliny etyléndiamíntetraoctovej.Process for recovering palladium from wastewater after catalytic hydrogenation of nitroso derivatives, characterized in that the pH of the wastewater is adjusted to less than 7.5 but greater than 3 by mineral acid and is contacted with a solid chemisorbent consisting of an activated carbon carrier and an anchored alkali phase salt of ethylenediaminetetraacetic acid.
CS84641A 1984-01-30 1984-01-30 A method for obtaining palladium from wastewater after catalytic hydrogenation of nitrosated derivatives CS251467B1 (en)

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CS84641A CS251467B1 (en) 1984-01-30 1984-01-30 A method for obtaining palladium from wastewater after catalytic hydrogenation of nitrosated derivatives

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CS84641A CS251467B1 (en) 1984-01-30 1984-01-30 A method for obtaining palladium from wastewater after catalytic hydrogenation of nitrosated derivatives

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302183A (en) * 1992-01-23 1994-04-12 Shell Oil Company Recovery of precious metals from catalyst residue

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302183A (en) * 1992-01-23 1994-04-12 Shell Oil Company Recovery of precious metals from catalyst residue

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