Low-Molecular-Weight Lignin Recovery with Nanofiltration in the Kraft Pulping Process
(2022) In Membranes 12(3). p.13-13- Abstract
- Kraft lignin is an underutilized resource from the pulp and paper industry with the potential of being a key raw material for renewable fuels and chemicals. The separation of high-molecular-weight lignin from black liquor by ultrafiltration has been widely investigated, while the permeate containing low-molecular-weight lignin has received little attention. Nanofiltration can concentrate the low-molecular-weight lignin. This work, therefore, evaluates nanofiltration for the separation and concentration of low-molecular-weight lignin from the ultrafiltration permeate. For this study, eight flat polymeric sheet membranes and one polymeric hollow fiber membrane, with molecular weight cut-offs ranging from 100 to 2000 Da, were tested. A... (More)
- Kraft lignin is an underutilized resource from the pulp and paper industry with the potential of being a key raw material for renewable fuels and chemicals. The separation of high-molecular-weight lignin from black liquor by ultrafiltration has been widely investigated, while the permeate containing low-molecular-weight lignin has received little attention. Nanofiltration can concentrate the low-molecular-weight lignin. This work, therefore, evaluates nanofiltration for the separation and concentration of low-molecular-weight lignin from the ultrafiltration permeate. For this study, eight flat polymeric sheet membranes and one polymeric hollow fiber membrane, with molecular weight cut-offs ranging from 100 to 2000 Da, were tested. A parametric study was conducted at 50 °C, 2.5–35 bar, and crossflow velocity of 0.3–0.5 m/s. At a transmembrane pressure of 35 bar, the best performing membranes were NF090801, with 90% lignin retention and 37 L/m2·h, and SelRO MPF-36, with 84% lignin retention and 72 L/m2·h. The other membranes showed either very high lignin retention with a very low flux or a high flux with retention lower than 80%. Concentration studies were performed with the two selected membranes at conditions (A) 50 °C and 35 bar and (B) 70 °C and 15 bar. The NF090801 membrane had the highest flux and lignin retention during the concentration studies. Overall, it was shown that the nanofiltration process is able to produce a concentrated lignin fraction, which can be either used to produce valuable chemicals or used to make lignin oil. (Less)
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https://lup.lub.lu.se/record/261c0c6c-9124-4ac6-8d72-2356be3c392d
- author
- Battestini Vives, Mariona LU ; Thuvander, Johan LU ; Arkell, Anders LU and Lipnizki, Frank LU
- organization
- publishing date
- 2022-03-09
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Membranes
- volume
- 12
- issue
- 3
- article number
- 310
- pages
- 13 - 13
- publisher
- MDPI AG
- external identifiers
-
- pmid:35323785
- scopus:85126527613
- ISSN
- 2077-0375
- DOI
- 10.3390/membranes12030310
- language
- English
- LU publication?
- yes
- id
- 261c0c6c-9124-4ac6-8d72-2356be3c392d
- date added to LUP
- 2022-03-25 15:27:59
- date last changed
- 2024-09-19 20:57:55
@article{261c0c6c-9124-4ac6-8d72-2356be3c392d, abstract = {{Kraft lignin is an underutilized resource from the pulp and paper industry with the potential of being a key raw material for renewable fuels and chemicals. The separation of high-molecular-weight lignin from black liquor by ultrafiltration has been widely investigated, while the permeate containing low-molecular-weight lignin has received little attention. Nanofiltration can concentrate the low-molecular-weight lignin. This work, therefore, evaluates nanofiltration for the separation and concentration of low-molecular-weight lignin from the ultrafiltration permeate. For this study, eight flat polymeric sheet membranes and one polymeric hollow fiber membrane, with molecular weight cut-offs ranging from 100 to 2000 Da, were tested. A parametric study was conducted at 50 °C, 2.5–35 bar, and crossflow velocity of 0.3–0.5 m/s. At a transmembrane pressure of 35 bar, the best performing membranes were NF090801, with 90% lignin retention and 37 L/m<sup>2</sup>·h, and SelRO MPF-36, with 84% lignin retention and 72 L/m<sup>2</sup>·h. The other membranes showed either very high lignin retention with a very low flux or a high flux with retention lower than 80%. Concentration studies were performed with the two selected membranes at conditions (A) 50 °C and 35 bar and (B) 70 °C and 15 bar. The NF090801 membrane had the highest flux and lignin retention during the concentration studies. Overall, it was shown that the nanofiltration process is able to produce a concentrated lignin fraction, which can be either used to produce valuable chemicals or used to make lignin oil.}}, author = {{Battestini Vives, Mariona and Thuvander, Johan and Arkell, Anders and Lipnizki, Frank}}, issn = {{2077-0375}}, language = {{eng}}, month = {{03}}, number = {{3}}, pages = {{13--13}}, publisher = {{MDPI AG}}, series = {{Membranes}}, title = {{Low-Molecular-Weight Lignin Recovery with Nanofiltration in the Kraft Pulping Process}}, url = {{http://dx.doi.org/10.3390/membranes12030310}}, doi = {{10.3390/membranes12030310}}, volume = {{12}}, year = {{2022}}, }