NMR studies of stock process water and reaction pathways in hydrothermal carbonization of furfural residue

Yue, Fen; Pedersen, Christian; Yan, Xiuyin; Liu, Yequn; Xiang, Danlei; Ning, Caifang; Wang, Yingxiong; Qiao, Yan

doi:10.1016/j.gee.2017.08.006

Cited by 30 publications

(16 citation statements)

References 39 publications

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“…Biochar or adsorbents from thermal cracking of furfural residue show good porosity and a high specific area (specific area: 567 m 2 /g, vtotal: 0.38 cm 3 /g), which completely meets the basic requirements of activated charcoal, especially clear adsorption effects on various metal ions, methyl blue, and tetracycline [69]. In addition, nuclear magnetic resonance technology can track and scan the whole process of preparing activated carbon from FR, determine the changes of carbon structure, electron transfer, surface chemistry, and adsorption capacity in the process, and provide a theoretical basis for further research on the preparation of economical, practical, diversified, and specialized biomass activated carbon from the pyrolysis of FR [70]. The latter refers to the process of using a small amount of oxygen or oxygen-containing substances as a gasification agent under incomplete combustion conditions to convert the combustible components in raw materials into carbon dioxide, hydrogen, methane, and other combustible gases by means of a high-temperature overheating chemical method.…”

Section: Application Of Fr In Thermal Decompositionmentioning

confidence: 99%

A Review on the Transformation of Furfural Residue for Value-Added Products

et al. 2019

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As a by-product of lignocellulosic depolymerization for furfural production, furfural residue (FR) is composed of residual cellulose, lignin, humic acid, and other small amounts of materials, which have high reuse value. However, due to the limitation of furfural production scale and production technology, the treatment of FR has many problems such as high yield, concentrated stacking, strong acidity, and difficult degradation. This leads to the limited treatment methods and high treatment cost of furfural residue. At present, most of the furfural enterprises can only be piled up at will, buried in soil, or directly burned. The air, soil, and rivers are polluted and the ecological balance is destroyed. Therefore, how to deal with furfural residue reasonably needs to be solved. In this review, value-added products for furfural residue conversion are described in detail in the fields of soil culture, catalytic hydrolysis, thermal decomposition, and porous adsorption. The future studies reporting the FR to convert value-added products could find guidance from this review to achieve specific goals.

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Section: Application Of Fr In Thermal Decompositionmentioning

confidence: 99%

A Review on the Transformation of Furfural Residue for Value-Added Products

et al. 2019

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“…[11] Furthermore, Latham et al, 2018 illus-trated that the addition of ammonium salts enhances the HTC of saccharides and increases the HC yield via the Maillard reaction (MR). [12] On the contrary, Wang et al, 2018 showed that the use of a high concentration of amino acid (glycine) and ammonium salts (ammonium sulfate and ammonium chloride) during HTC of glucose caused a reduction in HC yield. [13] Fan et al, 2018 studied the hydrothermal treatment of lactose and maltose at 250-350 °C with and without the addition of lysine and showed that the MR inhibits HTC and promotes the production of bio-oil at the expense of solid products.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐Containing Hydrochar: The Influence of Nitrogen‐Containing Compounds on the Hydrochar Formation

et al. 2020

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Hydrothermal carbonization (HTC) of fructose and urea containing solutions was conducted at 180 °C to study the influence of nitrogen‐containing compounds on the conversion process and HTC products properties. The concentration of fructose was fixed, while the concentration of urea was gradually increased to study its influence on the formation of nitrogen‐containing hydrochar (N−HC). The degradation of urea has an important influence on the HTC of fructose. The Maillard reaction (MR) promotes the formation of N−HC in acidic conditions. However, in alkaline conditions, MR promotes the formation of bio‐oil at the expense of N−HC. Alkaline conditions reduce N−HC yield by catalyzing fragmentation reactions of fructose and by promoting the isomerization of fructose to glucose. The results showed that adjusting the concentration of nitrogen‐containing compounds or the pH value of the reaction environment is important to force the reaction toward the formation of N−HC or N‐bio‐oil.

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“…The results show that its main components are acetic, formic, levulinic and glycolic acid, and hydroxy-methyl-furfural [5]. Moreover, 2-methoxyphenol and 2-methylbenzofuran [6], and methanol, glycerol, hydroxy acetone, and acetaldehyde [7] are also found.…”

Section: Introductionmentioning

confidence: 93%

Options for Removing Refractory Organic Substances in Pre-Treated Process Water from Hydrothermal Carbonization

Fettig

Austermann-Haun

Meier³

et al. 2019

Water

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Granular activated carbon (GAC) adsorption, as well as ozonation in combination with biodegradation was investigated in order to remove refractory organics from biologically pre-treated process waters (PW) produced by the hydrothermal carbonization (HTC) of spent grains and fine mulch. Kinetic tests revealed that the organics in spent grains PW had much lower molecular weights than organics in fine mulch PW. Moreover, isotherms showed that they were more strongly adsorbable. This was confirmed in GAC column experiments, where the breakthrough curves could be predicted fairly well by a dynamic adsorption model. On the other hand, ozonation had a stronger effect on fine mulch PW with respect to an enhancement of the aerobic degradability. Thus, the type of input material determines the properties of soluble reaction products from the carbonization process that must be accounted for when selecting the most suitable post-treatment method for HTC PW. However, adsorption on granular activated carbon should always be the final stage.

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NMR studies of stock process water and reaction pathways in hydrothermal carbonization of furfural residue

Cited by 30 publications

References 39 publications

A Review on the Transformation of Furfural Residue for Value-Added Products

A Review on the Transformation of Furfural Residue for Value-Added Products

Nitrogen‐Containing Hydrochar: The Influence of Nitrogen‐Containing Compounds on the Hydrochar Formation

Options for Removing Refractory Organic Substances in Pre-Treated Process Water from Hydrothermal Carbonization

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