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Functionalization of softwood kraft lignin for coating urea as highly efficient nitrogen fertilizer
RISE - Research Institutes of Sweden, Bioeconomy. KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy. KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy. 3Chinese Academy of Sciences & Ministry of Water Resources, China.
KTH Royal Institute of Technology, Sweden.
2017 (English)In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, 244-245 p.Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

An industrial softwood kraft lignin (SKL) was blended with polylactic acid (PLA) and used for complex coating of urea as nitrogen fertiliser. The coating was perfumed using a simple and cheap dip-coating technique. The lignin was pre-functionalised via esterification or Mannich reaction. Esterification rendered a lignin derivative with higher hydrophobicity, while the Mannich reaction introduced organically bound nitrogen onto the lignin derivative structure. It was found that the coating resulted in good attachment of the coating layer on the surface of urea pellets. The coating layer was very compact and the wall layer was rather homogeneous and well distributed. The urea coating not only constructed a physical barrier to delay urea dissolution (controlled release), but also supplied chemically slow-release, organically bound nitrogen and biological stabilisation effects. It was found that the Mannich reaction product (ManSKL/PLA) slowed down the urea release more than the PLA coating reference, taking approximately 1m000s or 6.7 times as long

Place, publisher, year, edition, pages
Stockholm: RISE Bioekonomi , 2017. 244-245 p.
Keyword [en]
dip coating, fertiliser, kraft lignin, polylactic acid, softwood, urea
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-29752ISBN: 9789186018207 (print)OAI: oai:DiVA.org:ri-29752DiVA: diva2:1104059
Conference
7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-10-09Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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