Method for recovering alkali and lignin from papermaking black liquor by cation replacement dialysis

The alkali and lignin are recovered in the papermaking black liquid through cation replacement dialysis method, which solves the membrane pollution and resource waste caused by electric field drive, and achieves efficient and low-energy resource utilization, and improves the recovery rate of alkali and lignin.

CN119102137AActive Publication Date: 2024-12-10INSTITUTE OF PROCESS ENGINEERING CHINESE ACADEMY OF SCIENCES
View PDF 8 Cites 0 Cited by

Patent Information

Application Number
CN202310686953.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-06-09
Publication Date
2024-12-10
Estimated Expiration
2043-06-09

AI Technical Summary

Technical Problem

The prior art treats papermaking black liquid due to electric field driving, and the feed pretreatment requirements are high, and the lignin resources are burned at low values, and the heat energy recovery efficiency is low, making it difficult to achieve efficient resource utilization of alkali and lignin.

Method used

Using cation replacement dialysis method, the papermaking black liquid and the aqueous solution containing ammonium ions are ionically replaced by a cation replacement dialysis device to lower the pH value to precipitate lignin, and the separation of alkali and lignin is achieved through ammonia recovery and further treatment, avoiding the Film contamination caused by electric field drive.

Benefits of technology

It has achieved low energy consumption and high efficiency recovery of alkali and lignin from papermaking black liquor, reduced the risk of membrane pollution, improved alkali recovery and lignin recovery, and promoted the resource utilization of papermaking black liquor.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119102137A_ABST
    Figure CN119102137A_ABST
Patent Text Reader

Abstract

The invention relates to the field of papermaking black liquid recycling, in particular to a method for recycling alkali and lignin from papermaking black liquid through cation replacement dialysis. The method comprises the following steps: 1) ammonium ion replacement dialysis: introducing the papermaking black liquid into a cation replacement dialysis device by adopting the cation replacement dialysis device, and carrying out cation replacement dialysis on the papermaking black liquid and an aqueous solution containing ammonium ions to obtain desalted ammonia-containing papermaking black liquid; 2) recovering ammonia: recovering ammonia from the desalted and ammonia-containing papermaking black liquid obtained in the step 1) to obtain ammonia or ammonia water and desalted and dealkalized papermaking black liquid; and 3) lignin separation: separating out lignin from the desalted and dealkalized papermaking black liquid obtained in the step 2) to obtain lignin precipitate and desalted, dealkalized and delignified papermaking black liquid. According to the method, alkali and lignin in the papermaking black liquid can be recovered at the same time, desalination of the papermaking black liquid is achieved, energy consumption is low, membrane pollution is not prone to being generated, and high alkali recovery rate and lignin recovery rate can be obtained.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Papermaking black liquid lignin separation and alkali recovery device and method

    CN113563605A

  • Alkali recovery process for paper-making black liquid

    CN103074796A

  • Treatment by chemical separation of black liquid which is resulted from the sulphate method paper making

    CN1037183A

  • Alkali recovery process for papermaking black liquid

    CN107524034A

  • PROCEDURE FOR FRACTIONATION OF LEAVES FROM ALKALINE MASS COOKING.

    FI870820A0