Title:
硼酸塩添加によるアルカリパルプ化液体苛性化効率増大法
Document Type and Number:
Japanese Patent JP4502508
Kind Code:
B2
Abstract:
A method is provided for improving causticizing efficiency in the conventional lime recausticization portion of an alkaline pulping process. Such processes are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. The method of this invention comprises reacting an aqueous solution of sodium carbonate with lime to produce sodium hydroxide (causticization) in the presence of borate in order to improve the causticization reaction efficiency. Borate is added in an amount sufficient to provide a boron to sodium (B/Na) molar ratio in the range of between about 0.001:1 and 0.4:1, and preferably in the range of between about 0.01:1 and 0.3:1, which results in an increased causticization efficiency of up to 8% over the reaction efficiency obtained in the absence of borate.
Inventors:
Trang, Hongfi, N
Bear, Charles, M
Mac Bloom, Robert, Bee
Bear, Charles, M
Mac Bloom, Robert, Bee
Application Number:
JP2000552340A
Publication Date:
July 14, 2010
Filing Date:
May 28, 1999
Export Citation:
Assignee:
U.S. Borax Incorporated
International Classes:
D21C11/00; D21C3/02; D21C11/04
Domestic Patent References:
| JP52042901A | ||||
| JP57161189A | ||||
| JP50064502A | ||||
| JP7316994A | ||||
| JP7126997A | ||||
| JP3185189A | ||||
| JP9273093A |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Sadafumi Kobori
Yukihiro Ikeda
Hajime Asamura
Sadafumi Kobori
Yukihiro Ikeda