Title:
CHEMICAL ALKALI RECOVERY TREATMENT PROCESS FOR CHEMIMECHANICAL PULPING WASTE LIQUID
Document Type and Number:
WIPO Patent Application WO/2024/040677
Kind Code:
A1
Abstract:
A chemical alkali recovery treatment process for chemimechanical pulping waste liquid, comprising the following steps: adding a pretreatment reagent into the chemimechanical pulping waste liquid for a pretreatment reaction, and obtaining a first mixture system after the pretreatment reaction, the pretreatment reagent being at least one of a hydrophobic modifier, a free radical reaction initiator and a metal ion salting-out agent, and the pH value of the chemimechanical pulping waste liquid being 12-14; adding a flocculating agent into the first mixture system for a precipitation reaction, and obtaining a second mixture system after the precipitation reaction; and performing solid-liquid separation on the second mixture system to obtain a solid organic precipitate and an alkaline recovery solution, the pH value of the alkaline recovery solution being 11.8-13. The treatment process is simple in process and low in energy consumption, can efficiently recycle organic matter components and alkali liquor in the chemimechanical pulping waste liquid, and has high economic value and thus is suitable for industrial application and popularization.
Inventors:
LI QUN (CN)
LIU JIAXUAN (CN)
LIU RONGRONG (CN)
SUN BINQING (CN)
GAO MENG (CN)
LIU JIAXUAN (CN)
LIU RONGRONG (CN)
SUN BINQING (CN)
GAO MENG (CN)
Application Number:
PCT/CN2022/121173
Publication Date:
February 29, 2024
Filing Date:
October 18, 2022
Export Citation:
Assignee:
TIANJIN UNIV OF SCIENCE AND & TECHNOLOGY (CN)
International Classes:
D21C11/04; C02F1/52; D21C11/00; C02F101/34
Domestic Patent References:
| WO2019241413A1 | 2019-12-19 |
Foreign References:
| CN115467182A | 2022-12-13 | |||
| CN1397684A | 2003-02-19 | |||
| CN103388275A | 2013-11-13 | |||
| CN109160591A | 2019-01-08 | |||
| CN103469664A | 2013-12-25 | |||
| CN101891290A | 2010-11-24 | |||
| CN102659290A | 2012-09-12 |
Attorney, Agent or Firm:
WUHAN ZHICHANSHIDAI INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)
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