Title:
METHOD FOR TREATMENT OF BLACK LIQUOR CONTAINING NO SULFIDE
Document Type and Number:
WIPO Patent Application WO/2008/108506
Kind Code:
A1
Abstract:
The object is to aggregate/collect lignin from a black liquor containing no sulfide discharged in the cooking process of a pulp by a water treatment technique and to remove any organic material remaining in the filtrate to collect water, an acid and caustic soda. A black liquor is added with a mineral acid and, if necessary, a distillation water to adjust to pH 1 to 7. An aggregating agent is added to the resulting solution to cause the aggregation of lignin, and then filtering off lignin. Ozone is contacted with the filtrate to cause the oxidative decomposition of an organic material in the solution, and the remaining organic material is adsorbed onto active carbon to remove the organic material.
Inventors:
AKO AKIRA (JP)
KOIKE KAZUMASA (JP)
KOIKE KAZUMASA (JP)
Application Number:
PCT/JP2008/054676
Publication Date:
September 12, 2008
Filing Date:
March 07, 2008
Export Citation:
Assignee:
NIHON CELLULOSE CO LTD (JP)
TOA KOGYO KK (JP)
AKO AKIRA (JP)
KOIKE KAZUMASA (JP)
TOA KOGYO KK (JP)
AKO AKIRA (JP)
KOIKE KAZUMASA (JP)
International Classes:
C02F1/52; B01D61/02; C02F1/28; C02F1/32; C02F1/44; C02F1/46; C02F1/78; C02F9/00; C07G1/00
Foreign References:
| JP2006102743A | 2006-04-20 | |||
| JPH0784716B2 | 1995-09-13 | |||
| JPH0889976A | 1996-04-09 | |||
| JP2003063999A | 2003-03-05 | |||
| JP2007006159A | 2007-01-11 | |||
| JP2006102743A | 2006-04-20 | |||
| JP2006283213A | 2006-10-19 | |||
| JPH06184974A | 1994-07-05 | |||
| JPH08188976A | 1996-07-23 | |||
| JPH10510469A | 1998-10-13 | |||
| JP2000237772A | 2000-09-05 |
Attorney, Agent or Firm:
MURATA, Yukio et al. (Fukusei Building 7th Floor 6-19, Yaesu 1-Chome, Chuo-K, Tokyo 28, JP)
Download PDF: