Two-step acid hydrolysis process kinetics in the saccharification of low-grade biomass: 1. Experimental studies on the formation and degradation of sugars

Choi, Chul-Ho; Mathews, A. P.

doi:10.1016/s0960-8524(96)00089-2

Cited by 37 publications

(19 citation statements)

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“…The hydrolysis of cellulose in mineral acids is strongly affected by its acid concentration and temperature. It is well known that high concentrations, more than 0.5 mol/L, even 10 mol/L, of mineral acid such as sulfuric acid, hydrochloric acid or phosphoric acid (Iranmahboob et al, 2002) and high temperatures, over 90uC, are required simultaneously in the acidic hydrolysis process to produce reducing saccharides from cellulose (Choi and Mathews, 1996). Between the two factors of acid concentration and temperature, if one varies to a considerable extent, another factor needs to follow with significant changes in order to maintain substantial hydrolysis.…”

Section: Introductionmentioning

confidence: 99%

Hydrolysis of bamboo fiber cellulose in formic acid

et al. 2008

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Bamboo fiber dissolution and hydrolysis in formic acid were studied. After hydrolysis, formic acid can be recovered in a clean state and reused. Solid water-soluble sugars were obtained. After being dipped into the formic acid solution for 30 min, the bamboo fibers started to swell. After one hour, the bamboo fibers gradually started to dissolve in the formic acid solution. The color of the liquor/solution turned green and dark. In the end, the bamboo fibers became thoroughly dissolved in the liquor after four hours. There was a clear hierarchical tissue structure on the fiber surface, as observed by AFM before treatment. The differential structure disappeared after 30 min of treatment. The fiber surface became plump and glossy. After six hours reaction at 60uC, the solid sugar mixture recovered contained glucose, cellobiose, cellotriose, cellotetrose, cellopentose and cellohexaose. A significant fraction of the sugar products consisted of monomeric glucose. More than 54.5% of the bamboo fiber mass had been transformed into monomeric glucose.

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Section: Introductionmentioning

confidence: 99%

Hydrolysis of bamboo fiber cellulose in formic acid

et al. 2008

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“…There is an absorption peak at 1257 cm -1 belonging to C-N appears, indicating that all catalysts have achieved the grafting of -NH 2 . The presence of -NH 3 + absorption peak indicates that -NH 2 is protonated by the electrostatic interaction with PTA.The bands at 1078 cm -1 , 889 cm -1 ascribed to P-O and W-Ob-W stretching vibrations were similar to those in the spectra of PTA. However, the bands belonging to W-Oc-W split into a maximum at 826 cm -1 with a shoulder at 792 cm -1 , the bands at 983 cm -1 ascribed to W-Od shifted to smaller wavenumber and became insensitive..…”

Section: Resultsmentioning

confidence: 53%

“…It can be seen from Fig.2 that the adsorption peak of the catalyst containing PTA @ MIL-101-NH 2 -Cl at 1050 cm -1 indicates that -Cl is present in the catalyst which proved -Cl is successfully grafted. Chlorine-containing catalysts and chlorine-free catalysts all have an absorption peak of -NH 3 + at 3458 cm -1 and 3366 cm -1 (Fig.2). There is an absorption peak at 1257 cm -1 belonging to C-N appears, indicating that all catalysts have achieved the grafting of -NH 2 .…”

Section: Resultsmentioning

confidence: 99%

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Influence of Strong Electronegativity Groups -Cl as the Adsorption Center of PTA@MIL-101-NH²-Cl for the Selective Hydrolysis of Cellulose into Glucose

Han¹,

Wang²,

Wan³

et al. 2017

Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)

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Abstract. In this paper, the catalyst PTA@MIL-101-NH 2 -Cl with various 2, 5-dichloroterephthalic acid was synthesized. Based on this, the effect of the strong negative groups -Cl on the crystal structure, molecular structure and thermal stability of the catalyst was studied. It was found that the immobilization of -Cl did not affect the structure of the catalyst, and it can improve the thermal stability of the catalyst to a certain extent. The mechanism of -Cl as the cellulose adsorption center in the directional hydrolysis of cellulose were analyzed. The strong negative groups -Cl form hydrogen bonds with the hydroxyl of cellulose to selectively adsorb cellulose, weaken the molecular hydrogen bonds of cellulose molecules to reduce the difficulty of cellulose hydrolysis and improve its hydrolysis efficiency. The yield of glucose obtained by the hydrolysis of cellulose after grafting-Cl catalyst was 81% higher than that without -Cl.

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“…It is less favored due to the increased capital cost associated with corrosion resistant materials, the energy cost associated with acid recovery and re-concentration, and the formation of degradation byproducts that reduce yield and inhibit fermentation (Ladisch, 1983). Many acids have been investigated such as maleic acid, phosphoric acid, and hydrochloric, but the most studied has been sulfuric acid due to its commodity chemical status and ability to hydrolyze cellulose (Mosier et al, 2002, Choi and Matthews, 1996, Zhang et al, 2007.…”

Section: Acid Catalyzed Hydrolysis Of Cellulosementioning

confidence: 99%

Preliminary investigation into single stage enzyme free hydrolysis of hardwood sawdust.

Dunaway

William²

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Enzymatic hydrolysis is the most common method of producing fermentable sugars from lignocellulosic biomass. Limitations to this step include the high cost of enzymes, and the time required to process the biomass. To increase the throughput and decrease catalyst cost, the preliminary development of a continuous concentrated sulfuric acid process is explored. The process requires two distinct steps. The first step involves hydrolyzing lignocellulose to fermentable sugars, glucose and xylose. The second step consists of glucose and xylose removal from the concentrated acid stream. The separation of sugars decreases the production of reaction byproducts and allows for the recycle of acid to the process.Single stage acid hydrolysis was tested at nine different reaction conditions. The optimum reaction condition occurred at 70 weight percent acid and 80°C with 58.2 percent glucose release as a percentage of available glucan and 86.5 percent xylose release as a percentage of available xylan. Detection of xylose and glucose in solution occurred at different times. These peaks are separated by enough time to warrant continuous removal of produced glucose and xylose to limit the production of reaction byproducts. In order to optimize this reaction condition, a limit of 63 percent glucose release as a percentage of available glucan was observed.A preliminary investigation of Dowex Monosphere 99 ion exchange resin to separate glucose and xylose from 70 weight percent was performed. At the column conditions tested, the sulfuric acid caused shrinkage and deactivation of the ion exchange resin leading to inefficient separation of glucose and xylose.

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Two-step acid hydrolysis process kinetics in the saccharification of low-grade biomass: 1. Experimental studies on the formation and degradation of sugars

Cited by 37 publications

References 1 publication

Hydrolysis of bamboo fiber cellulose in formic acid

Hydrolysis of bamboo fiber cellulose in formic acid

Influence of Strong Electronegativity Groups -Cl as the Adsorption Center of PTA@MIL-101-NH²-Cl for the Selective Hydrolysis of Cellulose into Glucose

Preliminary investigation into single stage enzyme free hydrolysis of hardwood sawdust.

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