Loading...
Welcome to Biomass Chemical Engineering,

Table of Content

    30 March 2023, Volume 57 Issue 2 Previous Issue    Next Issue
    Invited Paper
    Research Progress of Rosin-based Fluorescence Derivatives
    Hong GAO, Liwei DOU
    2023, 57 (2):  1-11.  doi: 10.3969/j.issn.1673-5854.2023.02.001
    Abstract ( 342 )   HTML ( 23 )   PDF (1344KB) ( 426 )   Save

    Rosin was an important natural renewable forestry resource in our country, mainly composed of resin acids, which contained a tricyclic phenanthrene skeleton with conjugated double bond and carboxyl group, thus they could undergo various chemical reactions such as hydrogenation, disproportionation, addition, esterification, rearrangement and oxidation. Dehydroabietic acid whose skeleton contained an aromatic ring was obtained from rosin by catalytic disproportionation and purification. Based on the aromatic ring and carboxylic acid group, a variety of fluorescent derivatives could be developed, which opened up a new way for the high value utilization of rosin. In this paper, several types of fluorescent derivatives based on dehydroabietic acid aromatic ring, including acylated compounds, aromatic amines, heterocyclic compounds, Schiff base compounds and other compounds, and fluorescent derivatives based on carboxylic acid modification, such as dehydroabietylamine, heterocyclic compounds, and dehydroabietic acid carboxyl derivatives, were emphatically summarized. Their fluorescence properties and applications as luminescent materials in the fields of organic light-emitting devices, fluorescent probes and cell imaging, were reviewed. The current existing insufficient problems on the research of rosin-based fluorescent derivatives were discussed, such as the deficiency of blue and red light materials with high luminescence efficiency, lower luminescence efficiency in organic electroluminescent devices relying on solid film luminescence, and the insufficient research on the luminescence mechanism. In addition, development trends in the future were prospected.

    Figures and Tables | References | Related Articles | Metrics
    Research Report
    Simulation Study and Scale-up Tests of Sludge Drying Coupled with Pyrolysis Based on Aspen Plus
    Lipeng QIN, Shaoji WU, Zhijin WANG, Jie LI, Yunquan LIU, Yueyuan YE
    2023, 57 (2):  12-20.  doi: 10.3969/j.issn.1673-5854.2023.02.002
    Abstract ( 313 )   HTML ( 15 )   PDF (743KB) ( 484 )   Save

    In the light of high energy consumption in sludge drying, a new process for sludge drying coupled with pyrolysis was proposed. The factors affecting the heat transfer of combustible gas(such as pyrolysis temperature and addition rate of poplar sawdust) and the influence of heating rate on pyrolysis products and system energy consumption were analyzed through the simulation with Aspen Plus software. The results indicated that when the co-pyrolysis of poplar sawdust and sludge was carried out, the addition rate of poplar sawdust must reach 43.5% to maintain a normal and stable operation of the system. When the pyrolysis temperature was 550 ℃, the yield of pyrolysis oil as the main component of combustible gas reached the maximum of 51.7%, and the system had the maximum heating capacity of 12.619 MJ/h. Additionally, it was found that when the heating rate increased, the yield of solid residue decreased, while the overall yield of pyrolysis oil and combustible gas increased. And when the heating rate decreased, the yield of pyrolytic oil and gas also decreased. Finally, the pilot plant scale-up test results showed that at a sludge feeding rate of 3 kg/h, the desired drying goal could be achieved at a minimum of residence time of 45 min and air flowrate of 40 L/min.

    Figures and Tables | References | Related Articles | Metrics
    The Difference of Enzymatic Hydrolysis Performance Between Poplar Fiber Cells and Parenchyma Cells
    Minglu LI, Lan WANG, Hongzhang CHEN
    2023, 57 (2):  21-28.  doi: 10.3969/j.issn.1673-5854.2023.02.003
    Abstract ( 191 )   HTML ( 10 )   PDF (690KB) ( 361 )   Save

    In this study, fiber cells and parenchyma cells of poplar were prepared from poplar by glacial acetic acid-hydrogen peroxide treatment. On this basis, the differences of enzymatic hydrolysis between fiber cells and parenchyma cells were investigated, and the influencing factors, water distribution and mechanical properties of the enzymatic hydrolysis process were analyzed. The results showed that parenchyma cells had higher accessibility of enzymatic reaction and the fermentable sugar content of parenchyma cells reached 208.6 g/L after 72 h of enzymatic hydrolysis, which was 8.5% higher than that of fibrous cells. With the same enzymatic hydrolysis efficiency of xylose(59%), the enzyme loading of parenchyma cells decreased by 50% compared to fibrous cells. The enzymatic hydrolysis rate of parenchyma cells increased by 15.4%-33.3% with the high solid system(the solid loading was more than 15 g/mL). The state of water distribution showed that parenchyma cells had weaker water binding effect during enzymatic hydrolysis process and had better liquefaction performance. The mechanical properties showed that the key stage determining the difference of enzymatic hydrolysis performance between fiber cells and parenchyma cells was the first 24 h. In addition, parenchyma cells had weak mechanical properties during enzymatic hydrolysis, which helped to save energy and shorten cycle time.

    Figures and Tables | References | Related Articles | Metrics
    Catalytic Oxidation of Glycerol to Glyceric Acid over Transition Metal Modified Nitrogened-doped Porous Carbon Supported Pt Catalyst
    Yihu KE, Chunmei ZHU, Jingyun LI, Hai LIU, Hong YUAN
    2023, 57 (2):  29-40.  doi: 10.3969/j.issn.1673-5854.2023.02.004
    Abstract ( 204 )   HTML ( 7 )   PDF (6879KB) ( 414 )   Save

    After doping different transition metals into metal-organic framework compounds, transition metal modified nitrogen-doped porous carbon material(M@NHC) was obtained by high temperature calcination. Then, Pt/M@NHC catalyst was prepared by colloidal deposition method and evaluated for catalytic oxidation of glycerol to glyceric acid under alkaline conditions. The result showed that the types of transition metals had a great influence on the conversion of glycerol and the glyceric acid selectivity, and the Ni-doped Pt/Ni@NHC catalyst exhibited the best catalytic activity. Combined with the characterization results of N2 physical adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, and CO2 temperature programmed desorption, it was found that the introduction of Ni not only changed the surface electronic structure of Pt, but also increased the antioxidant capacity of Pt nanoparticles via Ni-Pt synergies between metals. At the same time, the doping of surface nitrogen atoms increased the electrons on the Pt and adsorption oxygen surfaces, which would rapidly activate molecular oxygen and produce more active sites. In addition, Pt nanoparticles of Pt/Ni@NHC had the smallest particle size in all catalysts, which was conducive to the improvement of catalytic performance. The catalytic performance of Pt/Ni@NHC catalysts under different preparation conditions was investigated. The catalyst of Pt/Ni@NHC prepared under the conditions of 3% Ni content, calcination temperature of 800 ℃, the reaction pressure of 1 MPa and the reaction time of 6 h had the best catalytic performance. At this time, the conversion rate of glycerol was 63% and the selectivity of glyceric acid was 77.4%.

    Figures and Tables | References | Related Articles | Metrics
    Preparation and Properties of Liquefied Sodium Lignin Sulfonate Based Flame Retardant Polyurethane Foam
    Xinyu AN, Xu LI, Yue MA, Zhiming LIU
    2023, 57 (2):  41-47.  doi: 10.3969/j.issn.1673-5854.2023.02.005
    Abstract ( 194 )   HTML ( 5 )   PDF (6875KB) ( 377 )   Save

    Firstly, sodium lignosulfonate(SLS) was liquefied and modified, and then the SLS liquefied product was used to replace polyether polyols, and the flame retardant ammonium polyphosphates(APP) was added. The liquefied SLS-based flame retardant polyurethane foam(SLS-PUF/APP) was prepared by one-step foaming method. The physical properties of SLS liquefaction products were characterized. The flame retardancy of the materials was studied by limiting oxygen index(LOI) and vertical combustion test. The combustion behavior, microstructure and compression properties of the materials were investigated by cone calorimeter(CONE), scanning electron microscope(SEM) and electronic universal testing machine. The test results showed that the hydroxyl value, residue rate and viscosity of SLS liquefaction products were 537.3 mg/g, 0.77% and 332 mPa·s, respectively. When the SLS liquefaction product substitution rate for polyether polyol was 100%, the LOI value of the prepared material(100%SLS-PUF) reached 20.3%. On this basis, when the APP addition amount was 20%, the LOI value of the prepared material(100%SLS-PUF/20%APP) reached 23.9%. When the APP addition amount was greater than 19%, the vertical combustion grade of the material could reach the Ⅴ-0 level. Compared with pure PUF material, the maximum heat release rate and total heat release amount of 100%SLS-PUF/20%APP decreased by 693.5 kW/m2 and 7.7 MJ/m2, respectively, and the residual carbon content increased by 14.5 percent. At the same time, its compressive strength increased, from 74.0 kPa of pure PUF material to 283.8 kPa, indicating that the substitution of SLS liquefaction product and the addition of APP could significantly improve the compressive performance of PUF material and its flame retardant performance.

    Figures and Tables | References | Related Articles | Metrics
    Preparation of Biodiesel by Selective Hydrodeoxygenation Methyl Oleate over Cu-Mo/C Catalyst
    Cong YU, Shitao YU, Lu LI
    2023, 57 (2):  48-54.  doi: 10.3969/j.issn.1673-5854.2023.02.006
    Abstract ( 210 )   HTML ( 5 )   PDF (639KB) ( 450 )   Save

    The Cu-Mo/C catalyst was prepared with ammonium molybdate tetrahydrate and copper nitrate trihydrate, and used for the selective hydrodeoxygenation reaction of methyl oleate. The catalysts were characterized by X-ray diffraction, X-ray diffraction photoelectron spectroscopy and electron paramagnetic resonance spectroscopy. The optimal process for the preparation of biodiesel from methyl oleate catalyzed by Cu-Mo/C and the catalytic performance of Cu-Mo/C were investigated. The results of the study showed that the addition of Cu promoted the formation of Mo/C catalyst and the Mo2C and MoO2 component in the catalyst worked together. The oxygen vacancies on the MoO2 component could preferentially adsorb the C=O bond in the substrate and then Mo2C component hydrodeoxygenated it, avoiding the hydrogenation of C=C bond. The excellent performance of catalyst and the selectivity of unsaturated hydrocarbons were achieved. The conversion rate of methyl oleate reached 98.8%, and the selectivity of unsaturated hydrocarbons was 40.2% at reaction temperature of 280 ℃, hydrogen pressure of 2.5 MPa and reaction time of 3 h. The catalytic activity of Cu-Mo10/C was comparable to the noble metal Pd and commercial Mo/C catalysts, while the unsaturated hydrocarbon selectivity was higher as well as the good stability.

    Figures and Tables | References | Related Articles | Metrics
    Preparation and Antibacterial Properties of Silver Nanoparticles-quaternary Ammonium Lignin-cellulose Hydrogel
    Xiaoxuan ZHANG, Yushan HAN, Yuanyuan YU, Changzhou CHEN, Douyong MIN
    2023, 57 (2):  55-61.  doi: 10.3969/j.issn.1673-5854.2023.02.007
    Abstract ( 228 )   HTML ( 6 )   PDF (5157KB) ( 612 )   Save

    Alkali lignin(AL) was separated and purified from papermaking black liquor by acidic precipitation. Then, quaternary ammonium lignin(QAL) was obtained by modifying AL with 3-chloro-2-hydroxypropyl trimethyl ammonium chloride. Using cellulose hydrogel(CEH) as matrix, antibacterial silver nanoparticles-quaternary ammonium lignin-cellulose hydrogel(Ag NPs-QAL-CEH) was prepared by impregnating with QAL and silver nitrate solutions. The structures of AL and QAL were characterized by Fourier transform infrared spectroscopy and the results showed that QAL was successfully prepared. The results of elemental analysis showed that the content of nitrogen increased from 0.6% to 5.9%. Ag NPs-QAL-CEH was characterized by X-ray diffraction and scanning electron microscopy. The results indicated that Ag NPs were obtained by reducing Ag+ with QAL, and Ag NPs-QAL was uniformly dispersed in the three-dimensional network structure of CEH. The antibacterial performance of the hydrogel showed that Ag NPs-QAL-CEH formed obvious inhibition zone against S. aureus and E. coli. Furthermore, with the increase of AgNO3 dosage, the diameters of antibacterial circle increased from 14.2 mm to 20.1 mm and 16.1 mm to 18.1 mm, respectively. When the mass concentration of AgNO3 was 7.87 g/L in 50 mL QAL solution(including 2.5 g QAL), the obtained Ag NPS-6-QAL-CEH had the best bacteriostatic effect, and the inhibitory rates against S. aureus and E. coli could reach more than 99.5%.

    Figures and Tables | References | Related Articles | Metrics
    Review Comment
    Research Status and Development Trend of Bio-based Dust Suppressants
    Zhenglong XUE, Guanhua WANG, Hao SUN, Yunli ZHAO, Chuanling SI, Hongyu JIA
    2023, 57 (2):  62-70.  doi: 10.3969/j.issn.1673-5854.2023.02.008
    Abstract ( 330 )   HTML ( 10 )   PDF (1280KB) ( 451 )   Save

    The problem of air pollution caused by flowing dust was becoming more and more prominent to the ecological environment and human health. Dust suppressants had attracted wide attention in the industry owing to their efficient dust suppression performance and convenient usage. At the same time, driven by the "Double Carbon" policy, dust suppressants had been developed towards green and environmental protection. Among them, bio-based dust suppressants prepared from biomass were highly favored owing to the advantages of renewable raw materials and degradability. This paper introduced the classification of dust suppressants(wetting type dust suppressant, bonded dust suppressant, agglomeration-based dust suppressant and composite dust suppressant) and dust suppression mechanism. The status of research and application progress of bio-based dust suppressants prepared from natural biomass raw materials such as starch, cellulose, guar gum, lignin and protein were described in detail, and the main research results of bio-based dust suppressants were listed. Through the introduction and analysis of biomass raw materials, it was shown that biomass raw materials in the preparation of dust suppressants had significant advantages such as degradable, renewable resources and a wide range of sources. It is proposed that the use of natural biomass as a raw material for dust suppressants would be the main research and development direction of dust suppressants under the new environmental protection model.

    Figures and Tables | References | Related Articles | Metrics
    Research Progress on Lignin-based Flame Retardants
    Yu BEI, Shuxian WENG, Puyou JIA, Caiying BO, Lihong HU, Yonghong ZHOU
    2023, 57 (2):  71-78.  doi: 10.3969/j.issn.1673-5854.2023.02.009
    Abstract ( 277 )   HTML ( 10 )   PDF (721KB) ( 519 )   Save

    Lignin contained abundant carbon atoms in its chemical structure, which could be used as filler in polymer materials to provide carbon source and promote flame retardant in the combustion process of polymer materials. The molecular structure of lignin contained active groups such as aromatic group, phenolic hydroxyl group and alcohol hydroxyl group. A series of lignin-based flame retardants could be obtained by introducing flame retardant elements or groups into the chemical structure of lignin through chemical modification. Starting from the structure of lignin, this paper summarized the domestic and foreign research progress of unmodified lignin, nitrogen and phosphorus modified lignin, and nitrogen and phosphorus modified lignin doped with copper or non-metallic elements like silicon as flame retardants in different polymeric materials, including physical synergistic flame retardant formulations, chemical modification preparation process and the comparison of flame retardancy effect before and after treatment. The flame retardant mechanism of the corresponding flame retardants was analyzed, including the oxygen isolation effect by the released non-combustible gas, the formation of dense non-combustible carbon layer, and the hindering effect on heat transfer. Additionally, the application prospect of lignin-based flame retardants was prospected.

    Figures and Tables | References | Related Articles | Metrics
    Research Progress on Hydrothermal Synthesisand and Application of Biomass Porous Carbon Materials
    Mengjie CAI, Jun RAO, Yajie HU, Dan SUN, Feng PENG
    2023, 57 (2):  79-88.  doi: 10.3969/j.issn.1673-5854.2023.02.010
    Abstract ( 479 )   HTML ( 31 )   PDF (5208KB) ( 689 )   Save

    Biomass had negative carbon properties and met the requirements of green development as a typical renewable energy. Under relatively mild conditions, hydrothermal carbonization was the process of converting biomass into various functional carbon materials. This paper discussed recent advances of biomass-based porous carbon materials by the hydrothermal transformation from biomass, such as monosaccharides(glucose, fructose, and xylose), lignocellulosic fibers(cellulose, hemicellulose, and lignin) and chitosan. The effects of temperature, reaction time and raw material concentration on its structure and properties were mainly discussed, as well as its applications in gas adsorption, dye adsorption and heavy metal ion adsorption. The authors proposed future research directions for the hydrothermal synthesis of high performance and environmentally friendly porous carbon materials from biomass.

    Figures and Tables | References | Related Articles | Metrics
    Research Progress on Chemical Constitutents and Pharmacological Activities of Thorns of Gleditsia sinensis
    Yong LIU, Caihong ZHANG, Pujun XIE, Yejun DENG, Lixin HUANG
    2023, 57 (2):  89-98.  doi: 10.3969/j.issn.1673-5854.2023.02.011
    Abstract ( 302 )   HTML ( 5 )   PDF (1119KB) ( 474 )   Save

    Gleditsia sinensis thorn(GST) is widely distributed in China, which is commonly used in traditional Chinese medicine compatibility. However, few studies on its chemical composition and pharmacological activity hindered its further development and utilization. Based on the review of secondary metabolites containing saponins, flavonoids, triterpenoids, sterols, polyphenols, alkaloids, coumarins, indoles in GST, the research further introduced research progress of pharmacological activities of GST, such as anti-tumor, anti-bacterial, anti-oxidation, anti Human Immunodificiency Virus, anti-inflammatory, treatment of depression, treatment of prostate hyperplasia, treatment of endocrine disorders and immune regulation, providing a theoretical and application basis for the rational development and utilization of GST.

    Figures and Tables | References | Related Articles | Metrics