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Title:
2-ヒドロキシピリジン誘導体、2-ヒドロキシキノリンおよび2-ヒドロキシベンゾチアゾールの化学的抽出方法
Document Type and Number:
Japanese Patent JP4903347
Kind Code:
B2
Abstract:
A process for extracting from aqueous solution the alkali metal or calcium salt of a halo or haloalkyl substituted 2-hydroxypyridine, or a 2-hydroxyquinoline or 2-hydroxybenzothiazole which comprises contacting an aqueous alkaline or neutral solution of the alkali metal or calcium salt, in which is dissolved an alkali metal fluoride, chloride, bromide, hydroxide, sulphate, sulphite, cyanate, cyanide, thiocyanate, thiosulphate, sulphide, phosphate, hydrogen phosphate, carbonate, bicarbonate, borate, chlorate, hypochlorite, perchlorate, nitrite, chromate, dichromate or permanganate or calcium chloride, bromide, nitrate, nitrite, chlorate, hypochlorite, perchlorate, thiocyanate, thiosulphate, chromate, dichtromate or permanganate, with a partially water-miscible organic solvent so as to transfer aqueous solution of the alkali metal or calcium salt of the 2-hydroxypyridine, 2-hydroxyquinoline or 2-hydroxybenzothiasole into the solvent whilst retaining separate aqueous and solvent phases, and thereafter separating the solvent phase containing the alkali metal or calcium salt and water from the aqueous phase, the ratio of solvent to water in the separated solvent phase being from 0.5:1 to 10:1 w/w.

Inventors:
Jones, Raymond Vincent Haven
Stewart, Alastair Earin Curry
Alan John, Whitton
White, jennifer anne
Forester, Julie
Murray, Joanne Emma
Hamilton, Susan Thomson
Application Number:
JP2002507785A
Publication Date:
March 28, 2012
Filing Date:
June 14, 2001
Export Citation:
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Assignee:
Syngenta Limited
International Classes:
C07D213/64; B01D11/04; C07D215/22; C07D215/227; C07D277/68
Domestic Patent References:
JP58154561A
JP2000505800A
JP4885544A
JP5657728A
JP3813373B2
Foreign References:
US3609158
GB2305174A
US4208280
GB1317561A
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita