Sweet Sorghum as Feedstock for Ethanol Production: Enzymatic Hydrolysis of Steam-Pretreated Bagasse

Sipos, Bálint; Réczey, Jutka; Somorai, Zsolt; Kádár, Zsófia; Dienes, Dóra; Réczey, Kati

doi:10.1007/s12010-008-8423-9

Cited by 176 publications

(96 citation statements)

References 23 publications

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“…The experimental conditions of the steam explosion pretreatments are given in Table 1. The pretreatment conditions have been selected based on optimization for increased enzymatic degradability (highest glucose conversion in enzymatic hydrolysis) for each biomass in earlier studies [4,[32][33][34][35]. The severity factor (R 0 ), introduced by Overend and Chornet [36], is given in Table 1 for each steam exploded sample.…”

Section: Methodsmentioning

confidence: 99%

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Sebestyén

Jakab

May

et al. 2013

Journal of Analytical and Applied Pyrolysis

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The aim of this study was to evaluate the chemical changes in the main components (cellulose, hemicellulose and lignin) of various lignocellulosic biomass samples during the steam explosion pretreatment. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry/mass spectrometry (TG/MS) measurements have been performed on different native, washed and steam exploded woody (willow and spruce) and herbaceous (hemp, wheat straw and sweet sorghum bagasse) biomass samples. The main differences between the thermal decomposition of the samples are interpreted in terms of the altered structure of the biomass samples by the effective steam explosion treatment and the different alkali ion contents which have been determined using inductively coupled plasma-optical emission spectroscopy (ICP-OES) method. In order to separate these two effects, the native biomass samples have been washed with hot water to remove the main parts of the potassium and sodium ions. The concentration of K + and Na + has been reduced in the treated biomass samples so the thermal decomposition mechanism has been altered due to the elimination of the catalytic effects. Principal Component Analysis (PCA) has been used to find statistical correlations between the data. The functional group compositions of the lignin molecules have been modified significantly as indicated by the pyrograms and the score plot of the PCA. The amount of hemicellulose has been reduced. On the other hand, the relative amount of the structurally modified cellulose has been increased in the samples by the steam explosion pretreatment step.

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Section: Methodsmentioning

confidence: 99%

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Sebestyén

Jakab

May

et al. 2013

Journal of Analytical and Applied Pyrolysis

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“…saccharatum or Sorghum bicolor (hereinafter referred to as sweet sorghum) was proposed as a potential sugar source in 1975 [1], however two years later the idea of its utilization to produce energy came into focus of the interest [2]. Due to its high biomass productivity and high sugar content sweet sorghum was considered as an attractive multi-purpose crop.…”

Section: Introductionmentioning

confidence: 99%

“…Since ethanol production techniques have been extensively studied for decades, the production of cellulosic ethanol from bagasse enhanced the total ethanol yield [2,[20][21][22][23][24] and gained more interest. Production of ethanol from agricultural waste (or by-products) opens up numerous source of potential feedstock.…”

Section: Introductionmentioning

confidence: 99%

Chemical-free Processing of Sweet Sorghum Juice of Cultivar Sucrosorgho 506

Cséfalvay

Bakacsi

2018

Period. Polytech. Chem. Eng.

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The development of sweet sorghum syrup producing technology for the juice of cultivar Sucrosorgho 506 was completed. The applicability of different existing syrup production technologies including sugar beet-based sugar production technology, and sugar cane processing technology was also tested. The new chemical-free syrup production technology was realized at laboratory-scale and large laboratory-scale. The proposed technology offers a chemical free separation and concentration of carbohydrates, and consists of centrifugal separation; ultrafiltration extended with an approved sterilization followed by nanofiltration to separate carbohydrates and inorganics, and finally a vacuum evaporation to reach syrup state. By using this technology the initial glucose:fructose:sucrose ratio could be preserved in the syrup, therefore not limiting its further use. The possible food application was established by sensory analysis. It was revealed that the syrup produced via the developed process obtained the most attractive character that enables the opportunity to use as natural sweetener.

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“…Sorghum is a C 4 crop characterized by very efficient photosynthesis, which can grow quickly [1,3] and has wide range adaptability. Sweet sorghum produces a high yield of green biomass and a huge amount of ligno-cellulosic residue [4,5]. This biomass is renewable, cheap and widely available.…”

Section: Introductionmentioning

confidence: 99%

The Kraft Pulp And Paper Properties of Sweet Sorghum Bagasse (Sorghum bicolor L Moench)

Fatriasari

Supriyanto

Iswanto³

2015

J.Eng.Technol.Sci.

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Abstract. This study investigated the potency of sweet sorghum (Sorghum bicolor) bagasse as raw material for pulp and paper using kraft pulping. The effects of alkali and sulfidity loading on kraft pulp and paper properties were also investigated. The pulping condition of the kraft pulp consisted of three levels of alkali loading (17, 19 and 22%) and sulfidity loading (20, 22 and 24%). The maximum cooking temperature was 170°C for 4 h with a liquid to wood ratio of 10:1. Kraft pulping of this Numbu bagasse produced good pulp indicated by high screen yield and delignification selectivity with a low Kappa number (< 10). The unbleached pulp sheet produced a superior brightness level and a high burst index. The increase of active alkali loading tended to produce a negative effect on the pulp yield, Kappa number and paper sheet properties. Therefore, it is suggested to use a lower active alkaline concentration.Keywords: alkali and sulfidity loading; kraft pulping; pulp and paper properties; sweet sorghum bagasse. IntroductionThe deforestation rate in the world due to wood and paper demand is estimated at about 11.2 million hectares per year [1]. Therefore, the pulp and paper industry should find out alternative raw materials, particularly non-wood fiber coming from agricultural wastes [1,2] that are annually highly available. On the other hand, concerns about sustainable future fiber supplies and a potential increase in wood cost also stimulates the pulp and paper industry to find out other fiber sources, such as sorghum [2]. Sorghum is a C 4 crop characterized by very efficient photosynthesis, which can grow quickly [1,3] and has wide range adaptability. Sweet sorghum produces a high yield of green biomass and a huge amount of ligno-cellulosic residue [4,5]. This biomass is renewable, cheap and widely available. The residue produced by juice extraction from the stalk, the so-called bagasse, represents about 30% of the whole plant fresh weight [6] and is used for non-food applications containing carbohydrate polymers (cellulose and hemicellulose) and lignin. Sorghum bagasse contains 40-49% cellulose,which is important for pulp production, with a cutting cycle at 3 months after planting. Meanwhile, fast-growing species such as Acacia mangium and Eucalyptus urophylla, containing 60% of cellulose, need 7 years for producing 120 tons of cellulose/ha/7 years. The cellulose production of sweet sorghum can reach 15 tons/ha/3 months or 60 tons/ha/1 year or 420 ton/ha/7 years, which is considerably higher than the production of A. mangium and E. urophylla [7].Pulp of sweet sorghum can be used for the manufacture of fine quality writing paper, low luminosity printing paper and kraft paper as well as corrugated solid particleboard [1,2]. Investigation on sorghum fiber for pulp production has been conducted in India [1] using a conventional soda pulping process, where the average pulping yield was 45% and the Kappa number was 14-18. The pulp is characterized by short fibers and a high proportion of fines. The production of sorg...

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Sweet Sorghum as Feedstock for Ethanol Production: Enzymatic Hydrolysis of Steam-Pretreated Bagasse

Cited by 176 publications

References 23 publications

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Chemical-free Processing of Sweet Sorghum Juice of Cultivar Sucrosorgho 506

The Kraft Pulp And Paper Properties of Sweet Sorghum Bagasse (Sorghum bicolor L Moench)

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