Title:
PULP CLEAN BLEACHING PROCESS
Document Type and Number:
WIPO Patent Application WO/2007/025417
Kind Code:
A1
Abstract:
A pulp clean bleaching process includes: (1) single-stage two-column delignining; (2)
hypochlorite bleaching; (3) activator pretreatment; and (4)hydrogen peroxide bleaching.
The invention has acheived high efficent bleaching by using unpollutant oxygen
and hydrogen peroxide as clean bleach instead of using chlorine gas which produces
pollution on environment. In the invention, the bleaching efficiency is high
and the whiteness can be up to 85 percent; the construction investment is only
one fifth of that of chlorine dioxide bleaching; the level of pollution is lower,
AOX is reduced by over 70 percent, waste water discharge is reduced by 70 percent,
CODCr discharge is reduced by 60 percent. The production line can be
newly-constructed pulp bleaching production line or can be formed by reconstruction
on the basis of existing pulp bleaching production line, and especially suited
for the wood or herbage kind starting material chemical pulp clean bleaching
of scale of over 50 tons per day.
Inventors:
LI YOUMING (CN)
CHEN ZHONGHAO (CN)
LIU MINGYOU (CN)
CHEN ZHONGHAO (CN)
LIU MINGYOU (CN)
Application Number:
PCT/CN2005/002173
Publication Date:
March 08, 2007
Filing Date:
December 13, 2005
Export Citation:
Assignee:
SOUTH CHINA UNI OF TECH (CN)
LI YOUMING (CN)
CHEN ZHONGHAO (CN)
LIU MINGYOU (CN)
LI YOUMING (CN)
CHEN ZHONGHAO (CN)
LIU MINGYOU (CN)
International Classes:
D21C9/16; D21C9/12; D21C9/147; D21H21/32
Domestic Patent References:
| WO1995021290A1 | 1995-08-10 |
Foreign References:
| CN1438384A | 2003-08-27 |
Attorney, Agent or Firm:
GUANGZHOU YUEGAO PATENT AGENT LIMITED CORPORATION (B C, 5/F, Dangxiao Building, Jianshe Roa, Guangzhou Guangdong 0, CN)
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