The Sensitivity of the Catalyst Effectiveness Factor to Pore Size Distribution

Bensetiti, Zouhir; Schweich, D.; Abreu, César Augusto Moraes de

doi:10.1590/s0104-66321997000300013

Cited by 33 publications

(7 citation statements)

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“…The removal of toxic compounds from the hydrolysate could improve xylitol fermentation by yeast fermentation (Alves et al 1998;Rodrigues et al 2001;Canilha et al 2010). Similar original sugarcane hydrolysate composition was reported by Pessoa Júnior et al (1997) and Marton et al (2006).…”

Section: Resultssupporting

confidence: 74%

Evaluation of hexose and pentose in pre-cultivation of Candida guilliermondii on the key enzymes for xylitol production in sugarcane hemicellulosic hydrolysate

et al. 2010

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The evaluation of hexose and pentose in pre-cultivation of Candida guilliermondii FTI 20037 yeast on xylose reductase (XR) and xylitol dehydrogenase (XDH) enzymes activities was performed during fermentation in sugarcane bagasse hemicellulosic hydrolysate. The xylitol production was evaluated by using cells previously growth in 30.0 gl(-1) xylose, 30.0 gl(-1) glucose and in both sugars mixture (30.0 gl(-1) xylose and 2.0 gl(-1) glucose). The vacuum evaporated hydrolysate (80 gl(-1)) was detoxificated by ion exchange resin (A-860S; A500PS and C-150-Purolite®). The total phenolic compounds and acetic acid were 93.0 and 64.9%, respectively, removed by the resin hydrolysate treatment. All experiments were carried out in Erlenmeyer flasks at 200 rpm, 30°C. The maximum XR (0.618 Umg (Prot) (-1)) and XDH (0.783 Umg (Prot) (-1)) enzymes activities was obtained using inoculum previously growth in both sugars mixture. The highest cell concentration (10.6 gl(-1)) was obtained with inoculum pre-cultivated in the glucose. However, the xylitol yield and xylitol volumetric productivity were favored using the xylose as carbon source. In this case, it was observed maximum xylose (81%) and acetic acid (100%) consumption. It is very important to point out that maximum enzymatic activities were obtained when the mixture of sugars was used as carbon source of inoculum, while the highest fermentative parameters were obtained when xylose was used.

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Section: Resultssupporting

confidence: 74%

Evaluation of hexose and pentose in pre-cultivation of Candida guilliermondii on the key enzymes for xylitol production in sugarcane hemicellulosic hydrolysate

et al. 2010

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“…It is seen that the higher the temperature the lower the effectiveness factor, and the lower the catalyst particle size the higher the value of effectiveness factor. This behavior has also been reported by others [16,17]. For commercial particle size values of effectiveness factors of 0.4-0.55 were obtained which are within the range reported in the literature [8][9][10][11].…”

Section: Effectiveness Factorsupporting

confidence: 89%

A batch reactor study to determine effectiveness factors of commercial HDS catalyst

2005

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“…It was acid-hydrolyzed in a hydrolysis reactor with a capacity of 100 l located at the Department of Biotechnology of Engineering School of Lorena (EEL)-USP, Lorena, Brazil. The bagasse was percolated with H 2 SO 4 (98 % of purity) at a ratio of 100 mg H 2 SO 4 /g of dry material for 20 min at 121 °C, using a ratio of 1/10 of bagasse mass and volume of H 2 SO 4 solution (Pessoa et al 1997). After hydrolysis, the reaction mixture was cooled, subsequently recovered and was stored at 4 °C.…”

Section: Methodsmentioning

confidence: 99%

Rice bran extract: an inexpensive nitrogen source for the production of 2G ethanol from sugarcane bagasse hydrolysate

et al. 2012

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Selection of the raw material and its efficient utilization are the critical factors in economization of second generation (2G) ethanol production. Fermentation of the released sugars into ethanol by a suitable ethanol producing microorganism using cheap media ingredients is the cornerstone of the overall process. This study evaluated the potential of rice bran extract (RBE) as a cheap nitrogen source for the production of 2G ethanol by Scheffersomyces (Pichia) stipitis NRRL Y-7124 using sugarcane bagasse (SB) hemicellulosic hydrolysate. Dilute acid hydrolysis of SB showed 12.45 g/l of xylose and 0.67 g/l of glucose along with inhibitors. It was concentrated by vacuum evaporation and submitted to sequential detoxification (neutralization by calcium hydroxide and charcoal adsorption). The detoxified hydrolysate revealed the removal of furfural (81 %) and 5-hydroxymethylfurfural (61 %) leading to the final concentration of glucose (1.69 g/l) and xylose (33.03 g/l). S. stipitis was grown in three different fermentation media composed of detoxified hydrolysate as carbon source supplemented with varying nitrogen sources i.e. medium #1 (RBE + ammonium sulfate + calcium chloride), medium #2 (yeast extract + peptone) and medium #3 (yeast extract + peptone + malt extract). Medium #1 showed maximum ethanol production (8.6 g/l, yield 0.22 g/g) followed by medium #2 (8.1 g/l, yield 0.19 g/g) and medium #3 (7.4 g/l, yield 0.18 g/g).

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The Sensitivity of the Catalyst Effectiveness Factor to Pore Size Distribution

Cited by 33 publications

References 0 publications

Evaluation of hexose and pentose in pre-cultivation of Candida guilliermondii on the key enzymes for xylitol production in sugarcane hemicellulosic hydrolysate

Evaluation of hexose and pentose in pre-cultivation of Candida guilliermondii on the key enzymes for xylitol production in sugarcane hemicellulosic hydrolysate

A batch reactor study to determine effectiveness factors of commercial HDS catalyst

Rice bran extract: an inexpensive nitrogen source for the production of 2G ethanol from sugarcane bagasse hydrolysate

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