Catalytic conversion of cellulose-based biomass and glycerol to lactic acid

Li, Shi; Deng, Weiping; Li, Yanyun; Zhang, Qinghong; Wang, Ye

doi:10.1016/j.jechem.2018.07.012

Cited by 79 publications

(37 citation statements)

References 113 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, hydrolysis of cellulose also brings acetic and formic acid. [24,33] As shown in Figure 3a, the variation of product yield on reaction time follows an inverted U curve among these HPLC detected products: the product yield increased at the first 5 h, then decreased from 8 to 12 h. It is worth to mention that glucose, arabinose, xylitol, and glycerol disappeared after 12 h, which might be because they were further converted into small acids and even gas or condensed to large molecules. Only few succinic, malic, formic, and acetic acid (total yield, 2.2 wt%) were obtained after 12 h, while no gas other than N 2 was identified by determining the remaining gas in the reactor, therefore the unknown products were mostly large moleculars.…”

Section: Lignocellulose Hydrolysis/conversion To Monosaccharides Alcmentioning

confidence: 87%

“…Obviously, xylitol was derived from hemicellulose, whereas glycerol can be product of both hemicellulose and cellulose. [31][32][33] In addition, two smaller hydrolysis products were detected, i.e., formic acid and acetic acid, with yield of 1-5 wt%. Therefore, though carboxylic acids are mostly reported as oxidized products in the aerobic alkaline hydrolysis of cellulose, [34,35] hemicellulose and lignin, [13,36] formic and acetic acid can also be generated in the absence of oxygen.…”

Section: Lignocellulose Hydrolysis/conversion To Monosaccharides Alcmentioning

confidence: 99%

See 1 more Smart Citation

Revisiting Alkaline Pretreatment of Lignocellulose: Understanding the Structural Evolution of Three Components

Zhu

Liu

et al. 2020

Advanced Sustainable Systems

View full text Add to dashboard Cite

chemicals (for instance, monophenols) is difficult because of its structural heterogeneity and bio-recalcitrance nature. [3] Therefore, valorization of lignocellulose is mostly started with its fractionation into three components, which is of great importance for the exploration of the maximum potential value of lignocellulose. To date, many methods have been used to fractionate or/and convert lignocellulose, such as acidic pretreatment, [4] alkaline pretreatment, [5-9] reductive catalytic fractionation (RCF), [10-12] oxidative catalytic fractionation (OCF), [13] organosolv pretreatment, [14] ionic liquids pretreatment, [15,16] and deep eutectic solvent extraction (DES). [17,18] Wherein, alkaline pretreatment is one of the most used and efficient pretreatment, which has been widely employed in pulping industry and researches. [5] Nowadays, many alkaline pretreatment technologies have been developed, such as ammonia pretreatment, lime (Ca(OH) 2) pretreatment, sodium hydroxide (NaOH) and sodium carbonate (Na 2 CO 3) pretreatments. By using these methods, hemicellulose and lignin can be dissolved in the alkaline solution, while cellulose can be obtained as solid residue. In general, the fractionation rate of the lignin increases accordingly with the hydroxyl ions concentration. [5,19] Therefore, strong base, i.e., NaOH pretreatment has the highest efficiency on delignification, and so as the hemicellulose dissolution, when compared to other alkaline pretreatments. Thus, NaOH pretreatment has been drawing increasing attention for over hundred years by researchers and is widely used in industrial production. [5-9] However, the products in the downstream are complicated and unknown in the NaOH pretreatment. In recent years, conversion of lignin has been drawing increasing attentions and lignin is reported to be converted into many value-added chemicals that have variety of applications, by up-to-date technologies. [12,20-22] To extract more value from lignocellulose, not only conversion of carbohydrate, but also valorization of lignin should be taken into account. Before their valorization, chemical characters of carbohydrate and lignin should be clear. However, most of the researches aimed to obtain carbohydrates and to enzymatic hydrolysis of carbohydrates. [6-8] Chemical structure of three components after NaOH pretreatment, especially lignin, remains unclear. In this work, pine (softwood), comprising mainly of G-type

show abstract

Section: Lignocellulose Hydrolysis/conversion To Monosaccharides Alcmentioning

confidence: 87%

Section: Lignocellulose Hydrolysis/conversion To Monosaccharides Alcmentioning

confidence: 99%

Revisiting Alkaline Pretreatment of Lignocellulose: Understanding the Structural Evolution of Three Components

Zhu

Liu

et al. 2020

Advanced Sustainable Systems

View full text Add to dashboard Cite

show abstract

“…51 Lactic acid can be produced by chemical synthesis or by fermentation from sugars, the latter being the preferred alternative at the industrial level. 52 However, fermentation processes, despite being conducted at low temperature, involve some disadvantages that condition and complicate both the profitability and the environmental impact of lactic acid production. These include the necessity of operating under diluted conditions to avoid an excessively low pH value when high lactic acid yield is achieved, which favors inhibitory mechanisms slowing down the fermentation rate.…”

Section: Reactionmentioning

confidence: 99%

“…Lactic acid is conventionally used as an acidulant and preservative in the food industry, in the chemical industry as raw material for the production of pharmaceuticals, cosmetics, textiles, leather, and, in a fast‐growing niche market, as monomer for the biodegradable polymer poly‐(lactic acid) or PLA . Lactic acid can be produced by chemical synthesis or by fermentation from sugars, the latter being the preferred alternative at the industrial level …”

Section: Introductionmentioning

confidence: 99%

Glycerol valorization: conversion to lactic acid by heterogeneous catalysis and separation by ion exchange chromatography

Arcanjo

Silva

Cavalcante

et al. 2019

Biofuels Bioprod Bioref

View full text Add to dashboard Cite

The consumption and production of biodiesel has grown dramatically in recent decades, motivated by a strong interest in renewable energy. This has generated a surplus of its main by‐product, glycerol. Several catalytic processes have been proposed to generate alternatives for using this excess glycerol, mainly focusing on its transformation into high value‐added chemical products. Various products, ranging from syngas to organic acids, such as acrylic or lactic acid, along with 1,2‐propanediol, 1,3‐propanediol, glycerol ethers or even polymers, have been produced starting from glycerol. Among this multitude of possibilities, the production of lactic acid is one of the most interesting alternatives to valorize glycerol, because of the wide range of applications described for this organic acid. This review focuses on recent studies dealing with the catalytic conversion of glycerol to lactic acid, using different heterogeneous catalysts, and evaluates the factors influencing the oxidation catalytic process and the proposed reaction mechanisms. Finally, recent studies on the separation and purification of lactic acid using ion exchange chromatography resins are also reported. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

show abstract

“…Currently, LA is primarily prepared through the conventional biotechnological process via the fermentation of carbohydrates [1]. For the sake of conquering the detriments including high enzyme cost, low space-time yield, undesirable waste effluents, and large complexity in purification of the bio-fermentation technology, significant efforts have been paid for the effective chemical catalytic processes for obtaining LA from biomass-based material with satisfactory yield and selectivity under moderate conditions [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Catalytic Conversion of Glucose into Lactic Acid with Acidic MIL-101(Fe)

Liu

Zhang

et al. 2020

Journal of Chemistry

View full text Add to dashboard Cite

MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.

show abstract

Catalytic conversion of cellulose-based biomass and glycerol to lactic acid

Cited by 79 publications

References 113 publications

Revisiting Alkaline Pretreatment of Lignocellulose: Understanding the Structural Evolution of Three Components

Revisiting Alkaline Pretreatment of Lignocellulose: Understanding the Structural Evolution of Three Components

Glycerol valorization: conversion to lactic acid by heterogeneous catalysis and separation by ion exchange chromatography

Hydrothermal Catalytic Conversion of Glucose into Lactic Acid with Acidic MIL-101(Fe)

Contact Info

Product

Resources

About