Top > Search of International Patents > PALLADIUM EXTRACTION AGENT, PALLADIUM EXTRACTION METHOD, PALLADIUM RECOVERY METHOD, METHOD OF REGENERATING PALLADIUM EXTRACTION AGENT, AND REPEATED PALLADIUM RECOVERY METHOD

PALLADIUM EXTRACTION AGENT, PALLADIUM EXTRACTION METHOD, PALLADIUM RECOVERY METHOD, METHOD OF REGENERATING PALLADIUM EXTRACTION AGENT, AND REPEATED PALLADIUM RECOVERY METHOD

Foreign code F190009770
File No. (S2017-0791-N0)
Posted date May 7, 2019
Country WIPO
International application number 2018JP021569
International publication number WO 2018225738
Date of international filing Jun 5, 2018
Date of international publication Dec 13, 2018
Priority data
  • P2017-111863 (Jun 6, 2017) JP
Title PALLADIUM EXTRACTION AGENT, PALLADIUM EXTRACTION METHOD, PALLADIUM RECOVERY METHOD, METHOD OF REGENERATING PALLADIUM EXTRACTION AGENT, AND REPEATED PALLADIUM RECOVERY METHOD
Abstract This palladium extraction agent, which comprises an alkyl-sulfide-group-comprising disubstituted aromatic compound represented by general formula (I) as an active ingredient, can be used to selectively extract only palladium from a solution in which a mixture of platinum, rhodium, base metals, etc., is present, will not oxidize even after extended contact with acidic solutions, and can be used to extract palladium in a short length of time. (In the formula, R represents an optionally branched hydrocarbon group comprising 1–12 carbon atoms, an alicyclic hydrocarbon group comprising 5–7 carbon atoms, or an aromatic hydrocarbon group comprising 7 or 8 carbon atoms.)
Outline of related art and contending technology BACKGROUND ART
Palladium, platinum, rhodium platinum group metal type 3 a number of automobile exhaust gas catalyst used. Spread worldwide strengthening and regulatory emission regulations, therefore there is an increasing need of these metals, these metals are difficult to ensure stability of the resource. In addition, the increasing demand for automobile exhaust gas catalyst used with the increase being steadily. These metals are expensive, valuable resources from a metal, and is recovered after use and reuse is carried out. A platinum group metal in order to supply a certain amount, the used product from the separation of the platinum group metal with high efficiency becomes important.
Extract is available when there is a plurality of types of a platinum group element, platinum group element of one type of selectivity is difficult to express. In particular, palladium and platinum is chemically similar in nature is difficult to be separated from. Moreover, under a strong instability of the extraction for an extraction condition would not be a significant problem and solution, the development of new extraction is demanded.
And purification steps of the separation of the platinum group metal, electrolytic deposition method, ion-exchange method, precipitation method has been proposed that is, selectivity, from the viewpoint of economy and operability, a solvent extraction method has been widely adopted. Used in this application has been developed a variety of extraction has been used.
The current, known palladium is used as an extraction agent (DAS) and dialkylsulfides (for example, Patent Document 1, 2), an aqueous ammonia solution can be easily extracted by an inverse characteristic.
Scope of claims (In Japanese)請求の範囲 [請求項1]
下記一般式(I)で示されるアルキルスルフィド基含有2置換芳香族化合物を有効成分とするパラジウム抽出剤。
[化1]

(式中、Rは分岐していてもよい炭素数1~12の炭化水素基、炭素数5~7の脂環式炭化水素基、または、炭素数7~8の芳香族炭化水素基を表す。)

[請求項2]
 請求項1に記載のパラジウム抽出剤を含有する有機相を準備する工程、パラジウムを含む酸性水溶液と前記有機相とを接触させることにより、パラジウムを前記有機相に抽出する工程を備えた、パラジウムの抽出方法。

[請求項3]
 前記パラジウムを含む酸性水溶液が、少なくともパラジウムを含む多種の金属が混在する廃棄物を酸処理により水溶液化した酸浸出液である、請求項2に記載のパラジウムの抽出方法。

[請求項4]
 前記少なくともパラジウムを含む多種の金属が、パラジウム以外に、白金、ロジウム、ランタン、レアアース、ジルコニウム、および、ベースメタルから選ばれる少なくとも1種を含む、請求項3に記載のパラジウムの抽出方法。

[請求項5]
 請求項2に記載のパラジウムの抽出方法により得られたパラジウムを抽出した有機相と、チオ尿素を含む塩酸水溶液とを接触させて、パラジウムを水相に逆抽出する工程を備えたパラジウムの回収方法。

[請求項6]
 請求項2に記載のパラジウムの抽出方法により得られたパラジウムを抽出した有機相と、チオ尿素を含む塩酸水溶液とを接触させて、パラジウムを水相に逆抽出すると共に、有機相中の請求項1に記載のパラジウム抽出剤を再生させる工程を備えた、パラジウム抽出剤の再生方法。

[請求項7]
 請求項1に記載のパラジウム抽出剤を含有する有機相を準備する第1工程、パラジウムを含む酸性水溶液と前記有機相とを接触させることにより、パラジウムを前記有機相に抽出する第2工程、および、パラジウムを抽出した有機相と、チオ尿素を含む塩酸水溶液とを接触させて、パラジウムを水相に逆抽出する第3工程を備え、前記第2工程および前記第3工程を繰り返し行うことにより、パラジウム抽出剤を再生しつつ、パラジウムを繰り返して回収可能なパラジウムの反復回収方法。

[請求項8]
 前記第3工程の後に、再生したパラジウム抽出剤を含有する有機相を蒸留水により洗浄する第4工程をさらに備え、前記第2工程、第3工程、および、第4工程を繰り返し行う、請求項7に記載のパラジウムの反復回収方法。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • AKITA UNIVERSITY
  • Inventor
  • YAMADA, Manabu
  • MUNIYAPPAN, Rajiv Gandhi
  • HAGA, Kazutoshi
  • SHIBAYAMA, Atsushi
IPC(International Patent Classification)
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