Title:
高い炭酸塩含有量を有する溶解した灰からパルプ化化学品を回収する方法
Document Type and Number:
Japanese Patent JP6556264
Kind Code:
B2
Abstract:
A method of recovering wood pulping chemicals from black liquor produced in a wood pulping process where the process entails burning the black liquor in a recovery boiler to form ash containing high levels of carbonate as well as sodium, potassium and chloride. The ash is dissolved to form a dissolved ash solution that is directed to a first stage crystallization unit that concentrates the dissolved ash solution and which results in the precipitation of sodium sulfate and sodium carbonate. Thereafter the concentrated dissolved ash solution is directed to a second stage crystallization unit which adiabatically cools the concentrated dissolved ash solution to form a glaserite slurry and a purge stream that is rich in chloride. In order to reduce the tendency of sodium carbonate and burkeite to crystallize in the second stage crystallization unit and to encourage pure glaserite to crystalize in the crystallizer, the method entails mixing a sulfate source, such as sodium sulfate or sulfuric acid, to the concentrated dissolved ash solution upstream of the crystallizer.
More Like This:
| JPS5223854 | TWO-STAGE DISPOSAL PROCESS OF PULP DRAINAGE |
| WO/1996/038627 | OXIDATIVE TREATMENT OF BLEACH PLANT EFFLUENT |
Inventors:
Begley, Michael
Pecoraro, Thomas Anthony
Pecoraro, Thomas Anthony
Application Number:
JP2017562328A
Publication Date:
August 07, 2019
Filing Date:
May 31, 2016
Export Citation:
Assignee:
Veolia Water Technologies, Inc.
International Classes:
D21C11/00; C01D5/16; F23G7/04
Domestic Patent References:
| JP2010042341A | ||||
| JP48050001A | ||||
| JP56073620A | ||||
| JP4146284A | ||||
| JP49096993A | ||||
| JP9234302A |
Foreign References:
| US8721837 |
Attorney, Agent or Firm:
Yasunori Otsuka
Yasuhiro Otsuka
Shiro Takayanagi
Shuji Kimura
Osamu Shimoyama
Nagakawa Yukimitsu
Teruman Ayuzawa
Yasuhiro Otsuka
Shiro Takayanagi
Shuji Kimura
Osamu Shimoyama
Nagakawa Yukimitsu
Teruman Ayuzawa