Hydrothermal Treatment of Cellulose in Hot-Pressurized Water for the Production of Levulinic Acid

Yıl 2016, Cilt: 21 Sayı: 2, 415 - 434, 16.12.2016

Aslı Yüksel

https://doi.org/10.17482/uumfd.278150

Cited By: 2

Öz

In this paper,
hot-pressurized water, operating above boiling point and below critical point
of water (374. 15 °C and 22.1 MPa), was used as a reaction medium for the decomposition
of cellulose to high-value chemicals, such levulinic acid. Effects of reaction
temperature, pressure, time, external oxidant type and concentration on the cellulose
degradation and product distribution were evaluated. In order to compare the
cellulose decomposition and yields of levulinic acid, experiments were
performed with and without addition of oxidizing agents (H₂SO₄
and H₂O₂). Analysis of the liqueur was monitored by HPLC
and GC-MS at different temperatures (150 - 280 °C), pressures (5-64 bars) and
reaction times (30 - 120 mins). Levulinic acid, 5-HMF and formic acid were
detected as main products. 73% cellulose conversion was achieved with 38%
levulinic acid yield when 125 mM of sulfuric acid was added to the reaction
medium at 200 °C for 60 min reaction time. 

Anahtar Kelimeler

Cellulose, levulinic acid, 5-HMF, hot-pressurized water

LEVULİNİK ASİT ÜRETİMİ İÇİN SELÜLOZUN SICAK-BASINÇLI SUDA HİDROTERMAL MUAMELESİ

Öz

Bu
makalede selülozu değerli kimyasallara, özellikle levulinik asite, parçalamak amacı
ile suyun kaynama noktası üzerinde ve kritik noktası altında (374. 15 °C ve
22.1 MPa) çalışılan sıcak-basınçlı su, reaksiyon ortamı olarak kullanılmıştır.
Reaksiyon sıcaklığı, basıncı, süresi, oksitleme ajanı çeşidi ve miktarının
selülozun parçalanmasına ve ürün dağılımına olan etkileri incelenmiştir. Selüloz
bozunma yüzdesi ve levulinik asit oluşum verimini kıyaslamak amacı ile deneyler
hem oksitleme ajanı (H₂SO₄ ve H₂O₂)
kullanarak, hem de kullanmayarak gerçekleştirilmiştir. Farklı sıcaklık (150 -
280 °C), basınç  (5-64 bar) ve tepkime
sürelerinde (30 - 120 dk.) oluşan likit ürünlerin analizleri HPLC ve GC-MS ile
gerçekleştirilmiştir. Ana sıvı ürünler olarak levulinik asit, 5-HMF ve formik
asit tespit edilmiştir. 125 mM sülfürik asit eklenerek 200 °C sıcaklıkta ve 60
dk boyunca gerçekleştirilen tepkime sonucunda, %73 selüloz bozunmuş ve %38 verimle
levulinik asit elde edilmiştir.

Anahtar Kelimeler

Selüloz, levulinik asit, 5-HMF, sıcak-basınçlı su

Kaynakça

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