Title:
GASIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/1999/055804
Kind Code:
A1
Abstract:
A method for removing a cyanide component by or in application of steam stripping while suppressing the formation of a nickel-cyanide complex. A mixture of a raw material and sulfur is fed to a gasification step (101) in a way such that the mixture has a sulfur content of 0.5 to 2.0 wt. % and is gasificated. The resultant crude gas is washed in a cooling/carbon washing step (102), wherein nickel sulfide or the like is preferentially formed in a drain water and the formation of a nickel-cyanide complex is suppressed. A cyanide component is emitted as HCN. Alternatively, to stripper (201), drain water is introduced from line (210), a strong acid from line (211) and steam from line (212). A nickel-cyanide complex contained in a drain water having a controlled pH of 2.0 to 6.0 is decomposed to a cyanide ion and a nickel ion. The cyanide ion is finally emitted as HCN from line (216), and a nickel ion is discharged from line (217) and treated as nickel hydroxide.
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Inventors:
MIYASHITA KENJIRO (JP)
SASAKI MASAKAZU (JP)
TANIGUCHI SHUJI (JP)
HIROTANI KUNIO (JP)
SASAKI MASAKAZU (JP)
TANIGUCHI SHUJI (JP)
HIROTANI KUNIO (JP)
Application Number:
PCT/JP1999/002099
Publication Date:
November 04, 1999
Filing Date:
April 20, 1999
Export Citation:
Assignee:
TOYO ENGINEERING CORP (JP)
MIYASHITA KENJIRO (JP)
SASAKI MASAKAZU (JP)
TANIGUCHI SHUJI (JP)
HIROTANI KUNIO (JP)
MIYASHITA KENJIRO (JP)
SASAKI MASAKAZU (JP)
TANIGUCHI SHUJI (JP)
HIROTANI KUNIO (JP)
International Classes:
C02F1/20; C02F1/58; C10K1/10; C10K1/26; C10K1/32; (IPC1-7): C10K3/00; B01D19/00; C02F1/20; C02F1/58; C02F1/62; C10K1/02
Foreign References:
| JPS621784A | 1987-01-07 | |||
| JPS5422403A | 1979-02-20 |
Attorney, Agent or Firm:
Furuya, Kaoru (Nihonbashi-Horidomecho Chuo-ku Tokyo, JP)
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