Title:
HIGH-PURITY HYDROGEN HEXACYANOCOBALTATE COMPOUND AND METHOD FOR PREPARING SAME
Document Type and Number:
WIPO Patent Application WO/2022/158766
Kind Code:
A1
Abstract:
According to the present application, a H3Co(CN)6·x[CH3CH2OH] (x = 2.2-2.6) compound, in which the contents of K and S impurities are each 200-500 ppm, can be obtained through: a first step of adding H2SO4 to an aqueous K3Co(CN)6 solution, and then further adding ethanol to form a precipitate, removing the formed precipitate through a filtration process, and then collecting a filtrate to remove water and ethanol, to thereby obtain H3Co(CN)6 in which H2SO4 and K+ salt impurities are partially included; and a second step of dispersing the material obtained in the first step in ethanol while stirring to elute and remove H2SO4 impurities. A high-purity [CH3OH2]+
2[CH3O(H)-H-(H)OCH3]+[Co(CN)6)]3- compound can be obtained through a third step of adding methanol to the material obtained in the second step, removing insoluble substances by filtration, collecting the filtrate, lowering the temperature to precipitate crystals, and then separating the crystals, and the structure thereof was confirmed through X-ray crystallography. A high-purity compound having a composition of H+
3[Co(CN)6)]3-·x[CH3OH] (x = 1.4-1.8), in which the contents of K and S impurities are trace amounts of less than 10 ppm, can be obtained through a fourth step of removing some methanol by vacuum pressure reduction of the crystalline material obtained in the third step The high-purity H3Co(CN)6 compound can be effectively used in the production of a catalyst for preparing a polyurethane raw material (polyol) and a CO2/epoxide copolymerization catalyst.
Inventors:
LEE BUN YEOUL (KR)
SEO YEONG HYUN (KR)
LEE HYUNJU (KR)
SEO YEONG HYUN (KR)
LEE HYUNJU (KR)
Application Number:
PCT/KR2022/000267
Publication Date:
July 28, 2022
Filing Date:
January 07, 2022
Export Citation:
Assignee:
UNIV AJOU IND ACADEMIC COOP FOUND (KR)
International Classes:
C07F15/06; C08G65/26
Foreign References:
| JP2005520890A | 2005-07-14 | |||
| KR20150010602A | 2015-01-28 | |||
| KR20030003285A | 2003-01-09 | |||
| KR20030017976A | 2003-03-04 | |||
| JP2009517511A | 2009-04-30 | |||
| JP2019077850A | 2019-05-23 |
Attorney, Agent or Firm:
HAHN, Sun Hee (KR)
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