Abstract The new concept of integrated biorefineries has significantly changed pulp and paper industries. Lignin, which until then was only burned to generate energy, is now an important raw material for new products production. Kraft lignin (KL) fractions obtained by sequential fractionation with five organic solvents. This sequence allows to extract fractions from lower molar mass to higher molar one, resulting in more homogeneous samples. Lignin’s fractions were characterized by FTIR, GPC, TGA and Higher Heating Value (HHV). HHV for KL was 24966, the lowest being 17,891 (F5) and the highest being 27051 J/g (F1), inversely proportional to the molar masses of fractions. This is a very important result indicating that the lower HHV fractions can be used for certain applications, such as antioxidants, additives, polymers, among others, adding value to kraft lignin. Fractions with higher HHV could be used for energy generation in the cellulose paper industry.
#1Xiao Liu(SCUT: South China University of Technology)H-Index: 4
#2Tengfei Li(SCUT: South China University of Technology)H-Index: 4
Last. Yihui Yin(SCUT: South China University of Technology)H-Index: 2
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Abstract In this work, several representative green processes were developed to extract the enzymatic lignin and deep eutectic solvents (DESs) isolated lignin from corn straw. The results revealed that enzymatic lignin and DESs isolated lignin had a relatively low and homogeneous molecular weight and DESs isolated lignin shown a higher purity. Enzymatic and DESs isolated lignin showed good representativeness and similar to original herbal lignin structures accompany few aryl ether linkage cleava...
Abstract Heterogeneity and rigidity of lignocellulose causing resistance to its deconstruction have provided technical and economic challenges in the current biomass conversion processes. Lignin has been considered as a crucial recalcitrance component in biomass utilization. An in-depth understanding of lignin properties and their influences on biomass conversion can provide clues to improve biomass utilization. Also, utilization of lignin can significantly increase the economic viability of bio...
#1Adarsh Kumar(IIP: Indian Institute of Petroleum)H-Index: 8
#2Anushree(IITD: Indian Institute of Technology Delhi)H-Index: 1
Last. Thallada Bhaskar(IIP: Indian Institute of Petroleum)H-Index: 52
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Abstract The use of renewable carbon sources as a substitute for fossil resources is an extensively essential and fascinating research area for addressing the current issues related to climate and future fuel requirements. The utilization of lignocellulosic biomasses as a source for renewable fuel/chemicals/mesoporous biochar derivative is gaining considerable attention due to the neutral carbon cycle. The cellulose and hemicellulose are highly utilized components of biomass, and on the other ha...
#1Yanliang Song(Huada: Beijing University of Chemical Technology)H-Index: 4
#2Xiaoyou Shi(Huada: Beijing University of Chemical Technology)H-Index: 3
Last. Tianwei Tan(Huada: Beijing University of Chemical Technology)H-Index: 71
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A successive organic solvent fractionation was reported in this work to obtain lignin fractions with narrow molecular weight distribution and high purity from p-toluenesulfonic acid-extracted lignin. A decrease was found in PDI of fractionated lignin compared with parent substrate from 3.31 to 1.44 and the amount of carbohydrate derivates was detected to decline implying an increase of purity. Calculated from the results of DTG, thermal stability of lignin samples was enhanced through successive...
#1F.T.M. Silva(UFU: Federal University of Uberlandia)H-Index: 1
#2C.H. Ataíde(UFU: Federal University of Uberlandia)H-Index: 1
Abstract Brazil has a well-developed forest sector and is the largest producer of charcoal in the world in addition to being one of the main producers of wood. A big part of this production is destined to the steel industry. However, approximately 30 wt% of all wood energy is transformed into charcoal, and the other 70 wt% consisting of condensable and non-condensable gases (NCG) emitted in the atmosphere generating pollution and energy waste. With the purpose of altering this scenario, the pres...
Abstract Lignin, as the world's second most abundant renewable polymer, is an under-utilized sustainable resource. Most technical lignin, in particular kraft lignin (KL) – a byproduct from pulping process, is used as a fuel for recovery boilers. Thus, developing approaches to transform this under-utilized sustainable resource into a high-value bio-product, such as methacrylated lignin (ML) for UV-curable coatings, is of utmost importance to sustainability. In this work, methacrylated lignin (ML)...
#2Joon Weon Choi(SNU: Seoul National University)H-Index: 23
Abstract null null Pine saw dust (with and without alkali soaking) were given anaerobic or sonication only treatments and subjected to lignin extraction with acid catalysed gamma valerolactone acetone reagent combination. The highest lignin yield was obtained from anaerobic treated alkali soaked pine saw dust residue (43%). All the lignin samples showed noticeable features in terms of purity such as Klason lignin contents, CHO analysis together with molecular weights and FTIR for these to be an ...
Abstract null null Thermoplastic starch (TPS) is a widely studied biopolymer as an alternative to the use of conventional polymers. In this sense, the incorporation of fillers or reinforcements coming preferably from other substances of natural origin, can be an alternative to try to improve some mechanical and thermal properties of starch polymers. Thus, Kraft Lignin (KL), can be an excellent filler to be incorporated, since it presents mechanical and thermal properties and reduces the cost and...
Rice straw hydrotropic lignin was extracted from p-Toluene sulfonic acid (p-TsOH) fractionation with a different combined delignification factor (CDF). Hydrotropic lignin characterization was systematically investigated, and alkaline lignin was also studied for the contrast. Results showed that the hydrotropic rice straw lignin particle was in nanometer scopes. Compared with alkaline lignin, the hydrotropic lignin had greater molecular weight. NMR analysis showed that β-aryl ether linkage was we...
Technologies for the isolation of lignin from pulping process streams are reviewed in this article. Based on published data, the WestVaco process, the LignoBoost process, the LigoForce SystemTM and the SLRP process are reviewed and discussed for the isolation of lignin from Kraft black liquor. The three new processes that have now joined the WestVaco process are compared from the perspective of product quality. Further, isolation processes of lignosulfonates from spent sulfite liquor are reviewe...
Abstract Colorimetric indicators produced from nanofibers have a high contact surface area, allowing better interaction of the indicator with the external environment. In this context, this study aimed to develop time-pH indicator nanofibers with natural pigments for use as an emerging technology in the control of food quality. The polymeric solutions were prepared with 13% (w v-1) polycaprolactone (PCL) and 6% (w v-1) poly (ethylene oxide) (PEO). The natural dyes added to the polymeric solution...
Last. Jinquan Yue(NEFU: Northeast Forestry University)H-Index: 3
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In this study, molded fiber products (MFPs) were prepared from lignin compounded with Lewis acid-modified fibers using enzymatic hydrolysis lignin (EHL) as a bio-phenol. The fibers were modified and compounded entirely through hot-pressing. To improve the reactivity of enzymatic lignin, hydroxylated enzymatic hydrolysis lignin (HEHL) was prepared by hydroxylation modification of purified EHL with hydrogen peroxide (H2O2) and ferrous hydroxide (Fe(OH)3). HEHL was mixed uniformly with Lewis acid-m...
Abstract Biorefinery of biomass for value-added products and biofuel plays an important role in the sustainable global bioeconomy. Among various biorefinery processes and platforms, effective separation technologies are key to the economical production of value-added products and biofuel from biomass at a low cost. Amid the several separation technologies available, liquid-liquid extraction (LLE) has been shown to play a vital role in the separation and purification of bioproducts in biomass bio...
#1Avnish Kumar(IIP: Indian Institute of Petroleum)H-Index: 5
#2Bijoy Biswas(IIP: Indian Institute of Petroleum)H-Index: 13
Last. Thallada Bhaskar(IIP: Indian Institute of Petroleum)H-Index: 52
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Lignin is a macro polymer with aromatic structure and is a highly promising renewable carbon source for valuable chemicals and energy. It is available in huge quantities as a by-product from the paper & pulp industry and 2G ethanol industry. Valorization of lignin into useful chemicals can play a vital role in overcoming the demand of diverse chemicals being produced from petroleum feedstock. In the present study, we have examined the oxidative conversion of prot lignin in the presence of Cu/γ-A...
Abstract Lignins were extracted from different hydrolysates from the cashew apple bagasse (CAB). The hydrolysates, in turn, were obtained by pretreating the CAB with diluted acid (DA), acid/alkali (AA) and alkaline hydrogen peroxide (AHP). Lignin removal levels with AA and AHP were of 98.0% and 96.9%, resulting in high extraction yields and highly thermostable lignins. The lowest lignin yield was observed with the acid-only pretreatment. The FT-IR results showed that there was no significant dif...
