Study of a new complex method for extraction of phenolic compounds from bio-oils

Wang, Duo; Li, Debin; Liu, Yunquan; Lv, Dongcan; Zhu, Shengli; Zhang, Benbin

doi:10.1016/j.seppur.2014.07.033

Cited by 41 publications

(23 citation statements)

References 35 publications

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“…However, bark is also constituted for cellulose (30-40 wt%), hemicellulose (12-18 wt%), lignin (20-35 wt%) [5] and a low percentage of suberin, cutin and fatty compounds [6][7][8]. Therefore, its pyrolysis-oil is a complex multiphase fluid with a large number of carbohydrate-derived pyrolysis products, waxy materials, aqueous droplets and other products [9], whose affects both performance and cost of separation and purification of phenolic fraction [10]. Consequently, a pretreatment of bark to isolate tannins is a reasonable solution to improve recovery rates and selectivity of high-value compounds.…”

Section: Introductionmentioning

confidence: 99%

Fast pyrolysis of tannins from pine bark as a renewable source of catechols

Pinto

Romero

Carrier

et al. 2018

Journal of Analytical and Applied Pyrolysis

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Fast pyrolysis of water-insoluble (W-I) tannins-mainly composed of condensed tannins-obtained from Pinus radiata bark methanol-water extraction was carried out in pursuit of a renewable source of high-value chemicals, in particular catechols. Micropyrolysis in an isothermal furnace unit (Py-GC-MS/FID) was performed between 450-600°C. Catechin and W-I tannins were compared to establish thermal degradation behavior between this fraction and its representative monomer constituent. Additionally, W-I tannins were compared with typical sources of renewable phenols such as pine bark and organosolv-lignin in order to highlight its potential. Benchscale experiments of W-I tannins were performed in a fluidized bed reactor between 400-600°C to provide information related to yield and concentration of catechols. The Py-GC-MS/FID results showed that W-I tannins are prolific of catechol and 4-methylcatechol, similar to their most abundant monomer constituent catechin. However, W-I tannins are not only composed of condensed tannins and some substituted polycyclic aromatic hydrocarbons, triterpenes and carbohydrate-derived compounds were detected. The comparison of pyrolysis products among the renewable sources of phenols showed that W-I tannins yielded the highest relative content of catechols while guaiacols and carbohydrate-derived compounds predominated in the composition of lignin and bark products, respectively. The optimal pyrolysis-oil yield for bench scale assays (37 wt%) was found at 550°C and maximum yield of both catechol (4.4 wt%) and 4methylcatechol (2.3 wt%) were also obtained at 550°C.

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Section: Introductionmentioning

confidence: 99%

Fast pyrolysis of tannins from pine bark as a renewable source of catechols

Pinto

Romero

Carrier

et al. 2018

Journal of Analytical and Applied Pyrolysis

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“…In addition, more results of separating phenolic compounds using ILs as extractants were reported in the literature. 6 , 27 − 29 To our knowledge, m -cresol has the highest content (13.41 wt %) in phenol oil from low-temperature coal tar, 30 but fewer literature studies have reported the separation of m -cresol as a representative phenolic compound from model oil since phenol or p -cresol is usually selected as the typical phenolic compound. 6 , 21 , 31 − 33 Hence, it is meaningful to explore the separation of m -cresol from LTCT by means of ionic liquids.…”

Section: Introductionmentioning

confidence: 97%

Separation of m-Cresol from Coal Tar Model Oil Using Propylamine-Based Ionic Liquids: Extraction and Interaction Mechanism Exploration

et al. 2020

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m -Cresol is an important chemical material, which is mainly derived from low-temperature coal tar. In this work, for separating m -cresol from coal tar model oil, two propylamine-based ionic liquids (ILs) propylamine formate ([PA][FA]) and propylamine acetate ([PA][Ac]) were selected as extractants. The selected ILs were synthesized and characterized by Fourier transform infrared (FT-IR) and 1 H nuclear magnetic resonance (NMR) spectroscopy. The effects of temperature, mass ratio of IL to model oil, and separation time on the separation efficiency of m -cresol were explored. The separation efficiency (SE) and distribution coefficient ( D ) were calculated from the experimental data to assess the separation performance of [PA][FA] and [PA][Ac]. The results showed that propylamine formate was a promising extractant with the separation efficiency of 97.8% and distribution coefficient of 27.59 at 298.15 K and m IL / m oil = 0.2. In the meantime, molecular dynamics (MD) simulations were employed to comprehend the interaction mechanism, from which the noncovalent interaction energy (IE), radial distribution function (RDF), spatial distribution function (SDF), and averaged noncovalent interaction (aNCI) were calculated. The results showed that both cation and anion formed hydrogen bonds with m -cresol and the anions played a leading role with electrostatic interaction energy in separating m -cresol. In addition, the regeneration and reuse of the ionic liquids were explored.

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“…The recovery of hydroxycinnamic compounds was mostly proposed by membrane processes and liquid-liquid extraction, semipreparative HPLC, precipitation-adsorption, solid phase extraction (SPE) with diverse resins (Amberlite XAD7, XAD16,…) [5][6][7][8][9][10][11][12]. Adsorption enables the separation of selected compounds from dilute solutions.…”

Section: Introductionmentioning

confidence: 99%