Experimental Study of Subcritical Water Liquefaction of Biomass: Effects of Catalyst and Biomass Species

2014 ◽  
Author(s):  
Zhe Zhu ◽  
Saqib Sohail Toor ◽  
Lasse Rosendahl ◽  
Donghong Yu ◽  
Guanyi Chen
Keyword(s):  
Subcritical Water ◽  
Biomass Conversion ◽  
Woody Biomass ◽  
Sem Analysis ◽  
Apparent Effect ◽  
Wood Industry ◽  
Heating Value ◽  
Hot Compressed Water ◽  
Positive Effect ◽  
Thermal Stability Of

In this work, hydrothermal liquefaction (HTL) of wood industry residues (wood, bark, sawdust) and macroalgae for producing biofuels has been investigated under subcritical water conditions (at temperature of 300 °C), with and without the presence of a catalyst. The effects of catalyst and biomass type (woody and non-woody) on the biomass conversion, bio-crude yield, and the qualities of products were studied. The results suggested that the addition of potassium carbonate as a catalyst showed a positive effect on bio-crude yield, especially for wood, where it was enhanced to 47.48 wt%. Macroalgae showed a higher biomass conversion and a lower bio-crude yield than other woody biomass investigated in the present study, irrespective of whether the catalyst was used. Meanwhile, the effect of catalyst on macroalgae was less significant than that of woody biomass. The heating values and thermal stability of all bio-crudes were analyzed. The results showed that the higher heating values (HHVs) were in the range of 24.15 to 31.79 MJ/kg, and they were enhanced in the presence of a catalyst, except for that of the macroalgae. The solid residues were characterized by heating value, SEM and FTIR. It was found that the addition of K2CO3 lowered the solids quality in terms of the heating values, while it did not have apparent effect on the functional groups of solid residues. SEM analysis of the raw biomass and solid residues revealed that the char formation for wood, sawdust and macroalgae had initially finished when they were treated in hot compressed water at 300 °C, while conversion of bark had not completed yet.

FAKTOR YANG MEMPENGARUHI BEHAVIOR INTENTION UNTUK PENGGUNAAN APLIKASI DOMPET DIGITAL MENGGUNAKAN MODEL UTAUT2

2020 ◽  
Vol 25 (2) ◽  
pp. 111-122
Author(s):  
Aries Andrianto
Keyword(s):  
Sem Analysis ◽  
Electronic Money ◽  
Analysis Techniques ◽  
Behavior Intention ◽  
The Past ◽  
Performance Expectancy ◽  
Effort Expectancy ◽  
Facilitating Conditions ◽  
Positive Effect ◽  
Digital Wallet

Based on Bank Indonesia data, electronic money transactions have grown rapidly in the past 10 years. Throughout 2018, the volume of electronic money transactions was 2.92 billion transactions, growing 16,600 times compared to 2009.This study aims to analyze the factors that influence interest in using the LinkAja digital wallet using the UTAUT 2 method. The object of this study is the LinkAja digital wallet user who is domiciled in Jakarta. The independent variables examined in this study were Performance Expectancy, Effort Expectancy, Social Influence, Facilitating Conditions, Hedonic Motivation, and Habit on Behavior Intention using PLS-SEM analysis techniques. The results of this study indicate that Price Value has a positive effect on Behavior Intention.

scholarly journals Physicochemical characteristics of chitosan from swimming crab (Portunus trituberculatus) shells prepared by subcritical water pretreatment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gengxin Hao ◽  
Yanyu Hu ◽  
Linfan Shi ◽  
Jun Chen ◽  
Aixiu Cui ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Sodium Hydroxide ◽  
Subcritical Water ◽  
Physicochemical Characteristics ◽  
Ash Content ◽  
Portunus Trituberculatus ◽  
Swimming Crab ◽  
Water Pretreatment ◽  
Thermal Stability Of

AbstractThe physicochemical properties of chitosan obtained from the shells of swimming crab (Portunus trituberculatus) and prepared via subcritical water pretreatment were examined. At the deacetylation temperature of 90 °C, the yield, ash content, and molecular weight of chitosan in the shells prepared via subcritical water pretreatment were 12.2%, 0.6%, and 1187.2 kDa, respectively. These values were lower than those of shells prepared via sodium hydroxide pretreatment. At the deacetylation temperature of 120 °C, a similar trend was observed in chitosan molecular weight, but differences in chitosan yield and ash content were not remarkable. At the same deacetylation temperature, the structures of chitosan prepared via sodium hydroxide and subcritical water pretreatments were not substantially different. However, the compactness and thermal stability of chitosan prepared via sodium hydroxide pretreatment was lower than those of chitosan prepared via subcritical water pretreatment. Compared with the chitosan prepared by sodium hydroxide pretreatment, the chitosan prepared by subcritical water pretreatment was easier to use in preparing oligosaccharides, including (GlcN)2, via enzymatic hydrolysis with chitosanase. Results suggested that subcritical water pretreatment can be potentially used for the pretreatment of crustacean shells. The residues obtained via this method can be utilized to prepare chitosan.

scholarly journals Development of Nervilia fordii Extract-Loaded Electrospun PVA/PVP Nanocomposite for Antioxidant Packaging

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1728
Author(s):  
Peng Wen ◽  
Teng-Gen Hu ◽  
Yan Wen ◽  
Ke-Er Li ◽  
Wei-Peng Qiu ◽  
...  
Keyword(s):  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Poly Vinyl Alcohol ◽  
Total Phenolic ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Phenolic And Flavonoid ◽  
Thermal Stability Of

An ethyl acetate extract from of Nervilia fordii (NFE) with considerable suppression activity on lipid peroxidation (LPO) was first obtained with total phenolic and flavonoid contents and anti-LPO activity (IC50) of 86.67 ± 2.5 mg GAE/g sample, 334.56 ± 4.7 mg RE/g extract and 0.307 mg/mL, respectively. In order to improve its stability and expand its application in antioxidant packaging, the nano-encapsulation of NFE within poly(vinyl alcohol) (PVA) and polyvinyl(pyrrolidone) (PVP) bio-composite film was then successfully developed using electrospinning. SEM analysis revealed that the NFE-loaded fibers exhibited similar morphology to the neat PVA/PVP fibers with a bead-free and smooth morphology. The encapsulation efficiency of NFE was higher than 90% and the encapsulated NFE still retained its antioxidant capacity. Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD) analysis confirmed the successful encapsulation of NFE into fibers and their compatibility, and the thermal stability of which was also improved due to the intermolecular interaction demonstrated by thermo gravimetric analysis (TGA). The ability to preserve the fish oil’s oxidation and extend its shelf-life was also demonstrated, suggesting the obtained PVA/PVP/NFE fiber mat has the potential as a promising antioxidant food packaging material.

scholarly journals ENERGY PROPERTIES OF WOOD PARTICLES TORREFIED AT DIFFERENT TEMPERATURES

2017 ◽  
Vol 41 (4) ◽  
Author(s):  
Carlos Miguel Simões da Silva ◽  
Benedito Rocha Vital ◽  
Angélica de Cassia Oliveira Carneiro ◽  
Aylson Costa Oliveira ◽  
Solange Oliveira Araújo ◽  
...  
Keyword(s):  
Untreated Wood ◽  
Control Group ◽  
Fixed Carbon ◽  
Final Temperature ◽  
Heating Value ◽  
Physical Chemical ◽  
Wood Particles ◽  
Different Temperatures ◽  
Fixed Carbon Content ◽  
Positive Effect

ABSTRACT The objective of this study was to evaluate the effect of the final torrefaction temperature on the energy properties of wood. It was applied four treatments with three replicates, consisting of untreated wood particles and particles torrefied at temperatures of 170, 220 and 260ºC. Better physical, chemical and thermal properties of the particles were observed as a function of the torrefaction temperature. Comparing with the control group, the particles torrefied at the highest final temperature (260ºC) showed significant differences in bulk density - from 239 to 396kg/m3; the equilibrium moisture content changed from 12.3 to 5.7%; fixed carbon content - from 13.0 to 24.8%; heating value - from 4,465 to 4,945kcal/kg; and energy density - from 882 to 1,727Mcal/m3. It was concluded that torrefaction had a positive effect on the energy properties of the wood.

scholarly journals Correlations to Predict Elemental Compositions and Heating Value of Torrefied Biomass

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2443 ◽  
Author(s):  
Mahmudul Hasan ◽  
Yousef Haseli ◽  
Ernur Karadogan
Keyword(s):  
Carbon Content ◽  
Hydrogen Content ◽  
Woody Biomass ◽  
Coefficient Of Determination ◽  
Mass Yield ◽  
Solid Mass ◽  
Empirical Correlations ◽  
Heating Value ◽  
Torrefied Biomass ◽  
Data Points

Measurements reported in the literature on ultimate analysis of various types of torrefied woody biomass, comprising 152 data points, have been compiled and empirical correlations are developed to predict the carbon content, hydrogen content, and heating value of a torrefied wood as a function of solid mass yield. The range of torrefaction temperature, residence time and solid yield of the collected data is 200–300 °C, 5–60 min and 58–97%, respectively. Two correlations are proposed for carbon content with a coefficient of determination ( R 2 ) of 81.52% and 89.86%, two for hydrogen content with R 2 of 79.01% and 88.45%, and one for higher heating value with R 2 of 92.80%. The root mean square error (RMSE) values of the proposed correlations are 0.037, 0.028, 0.059, 0.043 and 0.023, respectively. The predictability of the proposed relations is examined with an additional set of experimental data and compared with the existing correlations in the literature. The new correlations can be used as a useful tool when designing torrefaction plants, furnaces, or gasifiers operating on torrefied wood.

Thermal Stability of Bed Particle Layers on Naturally Occurring Minerals from Dual Fluid Bed Gasification of Woody Biomass

2016 ◽  
Vol 30 (10) ◽  
pp. 8277-8285 ◽  
Author(s):  
Matthias Kuba ◽  
Hanbing He ◽  
Friedrich Kirnbauer ◽  
Nils Skoglund ◽  
Dan Boström ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Woody Biomass ◽  
Naturally Occurring ◽  
Fluid Bed ◽  
Thermal Stability Of

scholarly journals ANALISIS PENGARUH BUDAYA ORGANISASIONAL DAN KEPUASAN KERJA TERHADAP KOMITMEN ORGANISASIONAL DAN KINERJA BIDAN PADA RSUD KOTA MATARAM

2019 ◽  
Vol 8 (3) ◽  
Author(s):  
Baiq Sukmawati ◽  
Lalu Suparman ◽  
Surati Surati
Keyword(s):  
Job Satisfaction ◽  
Organizational Culture ◽  
Organizational Commitment ◽  
Structural Equation ◽  
Equation Model ◽  
Sem Analysis ◽  
City Hospital ◽  
Significant Positive Effect ◽  
Mediating Role ◽  
Positive Effect

This study examined the influence of organizational culture and job satisfaction on organizational commitment and performance of midwives in the Mataram City Public Hospital. Specifically the purpose of this study was to determine the significance of the influence of organizational culture, job satisfaction and organizational commitment on the performance of midwives, to know the significance of organizational culture and job satisfaction on organizational commitment, and to know the mediating role of variable organizational commitment in midwives in Mataram City Hospital. The study population was 72 midwives in charge of the RSUD Kota Mataram. This study uses structural equation model analysis (SEM analysis) with smartPLS applications. The results showed that organizational culture and organizational commitment had a significant positive effect on the performance of midwives, while job satisfaction did not significantly affect performance. Organizational culture and job satisfaction have a significant positive effect on organizational commitment. For the influence of mediation on organizational commitment, there is a full mediating role in the influence of job satisfaction on midwife performance, while the influence of organizational culture on the performance of midwives is found to have a partial mediation effect.Keywords:Organizational Culture, Job Satisfaction, Organizational Commitment, Midwife Performance.

ANALISIS PENGARUH PENERAPAN BUDAYA TERHADAP KEBUTUHAN EKONOMI DAN PERILAKU MANAJEMEN KEUANGAN PADA MASYARAKAT ENDE LIO

Analisis ◽  
2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Laurentius D. Gadi Djou ◽  
Apriana Marselina
Keyword(s):  
Financial Management ◽  
Structural Equation ◽  
Sem Analysis ◽  
Economic Conditions ◽  
Equation Modeling ◽  
Significant Positive Effect ◽  
Management Behavior ◽  
Financial Attitudes ◽  
Economic Needs ◽  
Positive Effect

Indonesia is a country that has diverse tribes and cultures. Each culture has different behavioral characteristics in terms of financial management that can affect the economic growth of a region. Wurumana culture is a local custom of the Ende Lio community which is related to the cycle of money circulation in the family which has become a tradition for generations. The purpose of this study was to determine the effect of local culture (Wurumana) on Economic Needs, the effect of Economic Needs on Financial Management Behavior, the influence of Economic Needs on Financial Attitudes, and to determine the effect of Financial Attitudes on Financial Management Behavior of the Ende Lio community. The research method used in this study is a quantitative method using Structural Equation Modeling (SEM) analysis tools using AMOS 22. The results of the study show that Wurumana Culture has a significant positive effect on Economic Conditions (H1), Economic Conditions are proven to have a significant positive effect on Management Behavior Financial (H2), Economic Conditions have a significant positive effect on Financial Attitudes (H3), and Financial Attitudes have a significant positive effect on Financial Management Behavior (H4).

Some aspects for increasing of heat-temperature strength of casting complex alloyed nickel-based alloys due to effect of redistribution of alloying elements between γ-solid solution and hardening γ′-phase

2021 ◽  
pp. 412-418
Author(s):  
V.N. Gadalov ◽  
A.V. Filonovich ◽  
I.V. Vornacheva ◽  
E.A. Filatov ◽  
I.A. Makarova
Keyword(s):  
Thermal Stability ◽  
Nickel Alloys ◽  
Diffusion Processes ◽  
Distribution Coefficients ◽  
Alloying Elements ◽  
Basic Principles ◽  
Heat Temperature ◽  
Positive Effect ◽  
Thermal Stability Of ◽  
Alloyed Nickel

The positive effect of alloying elements on the thermal stability of the γ-matrix and the strengthening γ'-phase of casting nickel alloys, and consequently, on the increase in their heat-temperature strength is established. The alloying elements inhibit diffusion processes, thereby increasing the creep resistance of alloys at high temperatures and loads. It is found that the most indicative parameters of the phase composition of the test alloys are the alloying elements distribution coefficients between the γ- and γ'-phases. The basic principles of balanced alloying are formulated, on which the choice of the optimal chemical composition of heat-temperature nickel alloys is carried out.

Sign in / Sign up

Export Citation Format

Share Document