Biomass valorization by using a sequence of acid hydrolysis and pyrolysis processes. Application to Leucaena leucocephala

Loaiza, J. M.; López, Francisco; García, M. T.; García, Juan Carlos Figueroa; Díaz, María José Moreno

doi:10.1016/j.fuel.2017.04.135

Cited by 22 publications

(17 citation statements)

References 47 publications

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“…Suitable characteristics of a raw material or solid phases, to be susceptible to pyrolysis, should include two conditions: a minimum E a of the pyrolytic process and a high amount of H 2 in the gas produced. The collection of hydrogen to energy production has also been carried in other researches by biomass pyrolysis [20,49,50]. In our case, the highest concentrations of H 2 produced and minimum E a are related to samples obtained at medium-high temperatures.…”

Section: Hydrogen Production By Pyrolysismentioning

confidence: 68%

“…In integral fractionation schemes, also known as "biorefinery schemes," the raw material is used to obtain a valorizable liquor and a solid residue that can be pyrolyzed to produce hydrogen in an integrated manner [16]. A number of authors have optimized pyrolysis processes to obtain energy from various sources including pyrolysis oil and synth gas, coal mixes, and mixtures of gases such as carbon monoxide and dioxide, hydrogen, and methane [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis

Loaiza

Palma

Díaz

et al. 2020

Biomass Conv. Bioref.

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Ensuring environmental and social-economic sustainability in the use of materials from lignocellulosic biomass requires their fractionation and valorization of their main components. In this work, we used Eucalyptus urograndis wood to obtain chemicals and energy. The raw material was characterized in chemical terms and then subjected to autohydrolysis under variable operating conditions to optimize the extraction of hemicellulose derivatives relative to cellulose. The kinetics of the pyrolysis process was modeled in terms of activation energy and hydrogen production. Using temperatures in the range of 180-190°C and treatment times in the range of 15-30 min allowed more than 74.5% of all hemicellulosic components in the raw material to be selectively extracted into the liquid post-hydrolysis phase, more than 90% of all glucan to remain in the solid phase and up to 27.8% of lignin to be removed. The thermal behavior of solid fraction was examined by thermogravimetric analysis, using variable heating rates under a nitrogen atmosphere, and the activation energy can be estimated by using the Flynn-Wall-Ozawa method. Based on the results, the pyrolysis of E. urograndis can be modeled as a first-order reaction. The activation energy (E a) at a fractional conversion α between 0.3 and 0.7 was 183 to 199 KJ mol −1 for the raw material, whereas that for the solid residue from autohydrolysis ranged from 179 to 186 kJ mol −1 at same fractional conversion when operational temperature in autohydrolysis was upper 185°C. Based on the results, using temperatures above 180°C and times of 15 min or longer [i.e., operating at the (0,0) experimental point for the autohydrolysis process] in combination with degrees of conversion from 0.3 to 0.8 reduced the activation energy of the pyrolysis process in relation to the raw material by up to 12% and removed hemicellulose by more 74.5% from it. In parallel, the comparative analysis of the E a values and the composition of the pyrolysis gas obtained showed a negative relationship between E a and the amount of hydrogen produced.

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Section: Hydrogen Production By Pyrolysismentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis

Loaiza

Palma

Díaz

et al. 2020

Biomass Conv. Bioref.

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“…The obtained H 2 concentrations are similar to the obtained values in another study by biomass pyrolysis. 38 In addition, the maximum values for hydrogen concentrations found in both experiments for the minimum activation energy correspond, in all cases, to samples obtained at medium values of processing time.…”

Section: Results and Discussionmentioning

confidence: 54%

“…This causes a relative increase in cellulose and lignin concentrations. It is known 38 that these compounds have the main responsibility in hydrogen generation during pyrolysis.…”

Section: Results and Discussionmentioning

confidence: 99%

MSW Compost Valorization by Pyrolysis: Influence of Composting Process Parameters

et al. 2020

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The valorization of urban solid waste compost (MSW) in two different composting conditions (different aeration and humidity) has been studied (we work with the hypothesis that the composting process can have a significant influence on a subsequent pyrolysis process). The influence of composting on subsequent pyrolysis of the material was assessed by examining the kinetics of the process, maximizing hydrogen production and minimizing the activation energy. The thermogravimetric analysis carried out on the samples have shown that they have a greater loss of weight of 9–14% at 270–275 °C and 22–27% at 444–446 °C. Using the Kissinger–Akahira–Sunose method, the activation energy values are found to be in the range of 57.78–581.69 kJ mol –1 , and the assumption that pyrolysis of compost could be modeled by a first-order reaction may be a suitable approximation. The analysis of the gases produced from the pyrolysis process revealed that hydrogen increases in concentration as composting time advances until intermediate time. In this form, the composting process could be a suitable previous treatment for improving the pyrolysis process. In fact, decreasing aeration and moisture in the MSW composting process led to the production of an increased amount of hydrogen (8.3%) by pyrolysis of the resulting compost and also to a decreased activation energy (102.8 kJ mol –1 ). These effects were also observed before the end of the composting process in the form of maximum hydrogen production and minimum activation energy after 20 days.

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“…The uses of microorganism or purified enzymes in biological way is promising but the process takes place slowly, less drastically, limitation in cultivating temperature and low tolerance to phenolic compound (Chen et al, 2010 ;Pilon et al, 1982). L. Leucocephala was previously delignified by alkaline process with soda and anthraquinone (complex heterogenous reaction process), Kraftt pulping and the most recently acid hydrolysis and pyrolysis process (Feria et al, 2012b ;Feria et al, 2012c ;Loaiza et al, 2017) primarily providing high yield of pulp, low residual lignin , high brightness and good strength properties (Shatalov and Pereira, 2004). Lately, research in the pulp and paper industry has been focused on to ensure sustainable development by using new technologies to improve delignification process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Formic Acid Concentration on Delignification of Leucaena Leucocephala

Athirah¹,

Hanimah²,

Noormazlinah³

et al. 2017

JCEIB

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Delignification is essential for wide range of technologies especially in paper industry and ethanol as transportation fuel. Researches have been made by thermal, mechanical, chemical and biology treatment. Recently, L. Leucocephala has been in centre of attraction for paper making industry while formic acid, a typical organosolv system has been given attention by the researchers due to effectiveness on the ability to break down and modify the lignin structure. Hence, delignification of L. Leucocephala was studied using chemical treatment with formic acid. The effect of reaction conditions including reaction temperature and formic acid concentration were investigated at atmospheric pressure for 6 hours of reaction time. Delignification percentage approximately 70 – 75 % (v/w) with a pulp yield of 40 – 62% (w/w) was obtained and the optimal reaction temperature is 90oC with 90% of formic acid concentration, respectively. Therefore, temperature and formic acid concentration affected significantly on the delignification process of L. Leucocephala.

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Biomass valorization by using a sequence of acid hydrolysis and pyrolysis processes. Application to Leucaena leucocephala

Cited by 22 publications

References 47 publications

Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis

Effect of autohydrolysis on hemicellulose extraction and pyrolytic hydrogen production from Eucalyptus urograndis

MSW Compost Valorization by Pyrolysis: Influence of Composting Process Parameters

Effect of Temperature and Formic Acid Concentration on Delignification of Leucaena Leucocephala

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