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The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw.

Abstract：

:Difficulties in the production of lignin from rice straw because of high silica content in the recovered lignin reduce its recovery yield and applications as bio-fuel and aromatic chemicals. Therefore, the objective of this study is to develop a novel method to reduce the silica content in lignin from rice straw more effectively and selectively. The method is established by monitoring the precipitation behavior as well as the chemical structure of precipitate by single-stage acidification at different pH values of black liquor collected from the alkaline treatment of rice straw. The result illustrates the significant influence of pH on the physical and chemical properties of the precipitate and the supernatant. The simple two-step acidification of the black liquor at pilot-scale by sulfuric acid 20w/v% is applied to recover lignin at pH 9 and pH 3 and gives a percentage of silica removal as high as 94.38%. Following the developed process, the high-quality lignin could be produced from abundant rice straw at the industrial-scale.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Do NH,Pham HH,Le TM,Lauwaert J,Diels L,Verberckmoes A,Do NHN,Tran VT,Le PK

doi

10.1038/s41598-020-77867-5

subject

Has Abstract

pub_date

2020-12-04 00:00:00

pages

21263

issue

1

issn

2045-2322

pii

10.1038/s41598-020-77867-5

journal_volume

10

pub_type

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