Title:
PROCESS FOR PRODUCING THIOUREA DIOXIDE AND BLEACHING OF PAPERMAKING PULP WITH THIOUREA DIOXIDE PRODUCED THEREBY
Document Type and Number:
WIPO Patent Application WO/1993/025522
Kind Code:
A1
Abstract:
An economical process for producing thiourea dioxide fluid with reduced chemical loss and energy consumption by mixing a combination of thiourea and a peroxide, a combination of thiourea, a peroxide and a reaction catalyst, or a combination of thiourea, a peroxide, a reaction catalyst and a chelating agent in the optional presence of pulp; and a method of bleaching pulp with the thiourea dioxide fluid thus produced.
Inventors:
KANADA TOSHIAKI (JP)
JINNOUCHI SEIKYU (JP)
SHIMPO MASAFUMI (JP)
KOSHITSUKA TETSUO (JP)
KIMURA AKIKO (JP)
JINNOUCHI SEIKYU (JP)
SHIMPO MASAFUMI (JP)
KOSHITSUKA TETSUO (JP)
KIMURA AKIKO (JP)
Application Number:
PCT/JP1993/000769
Publication Date:
December 23, 1993
Filing Date:
June 08, 1993
Export Citation:
Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
KANADA TOSHIAKI (JP)
JINNOUCHI SEIKYU (JP)
SHIMPO MASAFUMI (JP)
KOSHITSUKA TETSUO (JP)
KIMURA AKIKO (JP)
KANADA TOSHIAKI (JP)
JINNOUCHI SEIKYU (JP)
SHIMPO MASAFUMI (JP)
KOSHITSUKA TETSUO (JP)
KIMURA AKIKO (JP)
International Classes:
C07C381/14; D21C9/10; (IPC1-7): C07C381/14; D21C9/10
Foreign References:
| JPS5913756A | 1984-01-24 | |||
| JPS5517339A | 1980-02-06 | |||
| JPS61194289A | 1986-08-28 | |||
| JPH01162887A | 1989-06-27 |
Other References:
See also references of EP 0607448A4
Attorney, Agent or Firm:
Asamura, Kiyoshi (New Ohtemachi Building 2-1, Ohtemachi 2-chom, Chiyoda-ku Tokyo 100, JP)
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