Conversion of guaiacol in supercritical water gasification: Detailed effect of feedstock concentration

Changsuwan, Pattraporn; Paksung, Nattacha; Inoue, Shuhei; Inoue, Takahito; Kawai, Yoshifumi; Noguchi, Takashi; Tanigawa, H.; Matsumura, Yukihiko

doi:10.1016/j.supflu.2018.05.024

Cited by 14 publications

(9 citation statements)

References 23 publications

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“…As can be observed, supercritical water gasification (SWG) reported the lowest mass flowrate of char, which was expected according to the information found in the literature related to the advantages of this technique. Changsuwan et al 45 reported that supercritical water gasification can reach high gasification efficiency because of the reduction of char formation and the improvement of selectivity for H 2 .…”

Section: Results and Discussionmentioning

confidence: 99%

A Technical and Environmental Evaluation of Six Routes for Industrial Hydrogen Production from Empty Palm Fruit Bunches

2019

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Currently, the production of alternative fuels from renewable sources such as biomass has been increased in order to meet energy policies and reduce the environmental impacts of fossil fuels. This work is focused on hydrogen production from oil palm empty fruit bunches using different biomass gasification methods (direct gasification, indirect gasification, and supercritical water gasification) and purification technologies (selexol-based absorption and pressure swing adsorption). Six routes were selected based on these technologies and simulated using Aspen Plus software. Possible operating process improvements were suggested based on parametric sensitivity analysis by studying the effect of several variables on hydrogen production: gasification temperature, gasifying agent-to-biomass ratio, steam-to-carbon monoxide ratio, temperature of a high-temperature step reactor, and pressure in a hydrogen purification unit. The methodology of waste reduction algorithm was performed to assess the environmental impacts of each route. Results showed that hydrogen production was improved by increasing the gasification reaction temperature to 900 °C, oxygen-to-biomass ratio to 1.5, and pressure of purification stage to 10 atm for all routes. However, routes 1 and 2 presented a slight increase up to 0.7% in hydrogen yield using 1.5 mol O2/mol biomass. The environmental assessment revealed that routes 3 and 4 exhibited the lowest toxicological and atmospheric environmental impacts because of the use of char generated in the gasification reaction for energy production. These results indicated that route 4 exhibited the best performance for producing hydrogen from an environmental viewpoint.

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Section: Results and Discussionmentioning

confidence: 99%

A Technical and Environmental Evaluation of Six Routes for Industrial Hydrogen Production from Empty Palm Fruit Bunches

2019

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“…The main component of the gaseous product was different from that obtained from only acetic acid gasification due to the presence of H 2 , CO, CO 2 , and CH 4 obtained from the decomposition of guaiacol. 8 The CO 2 and CH 4 contents increased with increasing acetic acid concentration, apparently due to the generation of CO 2 and CH 4 from acetic acid ( Figure 2 ). In contrast, contents of CO and H 2 , which are mainly from guaiacol, are reduced with increasing acetic acid concentration.…”

Section: Results and Discussionmentioning

confidence: 94%

“…Both CO and CH 4 are produced directly from guaiacol. 8 Considering the stability of the benzene ring, these molecules should be produced from the methoxy group of guaiacol via methoxy radical formation. The addition of acetic acid reduces the yield of these gases; thus, acetic acid apparently interacts with the methoxy radical.…”

Section: Results and Discussionmentioning

confidence: 99%

“…A detailed description of this reactor and its operating procedures have been reported in a previous paper. 8 Briefly, we prepared a range of mixtures of 0.5 wt % guaiacol and various concentrations of acetic acid (0–2.0 wt %). The mixtures were fed into the reactor at a temperature of 600 °C and a pressure of 25 MPa using a high-pressure pump at a flow rate of 2.0 mL/min to achieve a fixed residence time of 94 s. All the samples were collected after conducting the experiment for 2 h to reach the steady state.…”

Section: Methodsmentioning

confidence: 99%

“…However, even a trace amount of solid products can cause reactor plugging during the long-term operation, and also lowering the carbon gasification efficiency (CGE). 6 In our previous study, 6 − 8 we found that the char and tar yields from the SCWG of biomass depended on the process parameters, such as temperature, feedstock concentration, residence time, and catalyst, based on which we discussed the char formation mechanism. Understanding this mechanism is important in determining the conditions to suppress unwanted reactions.…”

Section: Introductionmentioning

confidence: 98%

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Supercritical Water Gasification of Guaiacol with Acetic Acid as a Radical Scavenger: Interaction Effect on Char Formation and Gas Composition

2020

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Supercritical water gasification (SCWG) of mixtures of guaiacol and acetic acid was carried out in a continuous reactor at 600 °C and 25 MPa with a residence time of 94 s. Different concentrations of acetic acid were employed to investigate the effect of acetic acid on product yield and gas composition. The interaction between guaiacol and acetic acid during SCWG was discussed. Acetic acid, as a radical scavenger, was found to inhibit radical polymerization, resulting in the suppression of char formation.

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Alkali-catalyzed supercritical water gasification of sewage sludge: effect of liquid residue reuse as homogenous catalyst

Zhang

Weng

et al. 2020

Int. J. Environ. Sci. Technol.

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Conversion of guaiacol in supercritical water gasification: Detailed effect of feedstock concentration

Cited by 14 publications

References 23 publications

A Technical and Environmental Evaluation of Six Routes for Industrial Hydrogen Production from Empty Palm Fruit Bunches

A Technical and Environmental Evaluation of Six Routes for Industrial Hydrogen Production from Empty Palm Fruit Bunches

Supercritical Water Gasification of Guaiacol with Acetic Acid as a Radical Scavenger: Interaction Effect on Char Formation and Gas Composition

Alkali-catalyzed supercritical water gasification of sewage sludge: effect of liquid residue reuse as homogenous catalyst

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