A comparative study on direct production of ethyl levulinate from glucose in ethanol media catalysed by different acid catalysts

AbstractDirect production of ethyl levulinate (EL) from glucose catalysed by a liquid acid catalyst (sulfuric acid) and a solid acid zeolite catalyst USY NKF-7 (USY) in ethanol media was investigated in this study. Effects of the initial glucose concentration (C G0), reaction temperature (T), amount of acid catalyst, and water addition on the yields of EL were compared, respectively. The results show that higher yield of EL can be obtained at lower C G0. Higher temperature and acid concentration can accelerate the reaction rate, but the formation rate of the by-products increases more quickly than that of EL. Water addition also can result in the decrease of the yield of EL. Although sulfuric acid is efficient in the production of EL, the USY is more efficient in converting glucose to 5-ethoxymethyl-2-furaldehyde. Moreover, the use of USY can limit the diethyl ether production, and it can be reused for multiple times.

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Effect of Reaction Parameters on the Production of Ethyl Levulinate from Glucose in Ethanol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.388 ◽

2012 ◽

Vol 512-515 ◽

pp. 388-391 ◽

Cited By ~ 1

Author(s):

Chun Chang ◽

Xiao Xian Jiang ◽

Ting Zhang ◽

Bo Li

Keyword(s):

Sulfuric Acid ◽

Acid Concentration ◽

Glucose Concentration ◽

Sulfuric Acid Concentration ◽

Ethanol Conversion ◽

Reaction Parameters ◽

Water Addition ◽

Initial Glucose Concentration ◽

Ethyl Levulinate ◽

Higher Temperature

In order to explore the forming rules of ethyl levulinate from glucose in ethanol, several reaction parameters including the initial glucose concentration (10~30 g/L), sulfuric acid concentration (0.1~2 wt%), temperature (170~200 °C) and water addition were investigate, respectively. In addition, effect of the acid concentration on ethanol conversion was also studied. The results show that lower initial glucose concentration is helpful to improve the ethyl levulinate yield, and higher acid concentration can improve the conversion of glucose to ethyl levulinate, which also can improve the condensation of the ethanol. However, higher temperature is unfavorable for the increase of ethyl levulinate yield, and the ethyl levulinate decreased significantly with the increase of water addition.

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Efficient Conversion of Furfuryl Alcohol Into Ethyl Levulinate in an Extremely Low Sulfuric Acid Catalyst System

Journal of Bioprocess Engineering and Biorefinery ◽

10.1166/jbeb.2013.1053 ◽

2013 ◽

Vol 2 (3) ◽

pp. 182-187

Author(s):

Geng Zhao ◽

Yong Sun ◽

Xianhai Zeng ◽

Lu Lin

Keyword(s):

Sulfuric Acid ◽

Furfuryl Alcohol ◽

Acid Catalyst ◽

Catalyst System ◽

Efficient Conversion ◽

Ethyl Levulinate ◽

Sulfuric Acid Catalyst

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Direct Conversion of Glucose in Ethanol and Ethanol/Water Mixed Medium

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.312 ◽

2013 ◽

Vol 291-294 ◽

pp. 312-315 ◽

Cited By ~ 2

Author(s):

Chun Chang ◽

Bo Li ◽

Gui Zhuan Xu ◽

Pei Qin Sun

Keyword(s):

Sulfuric Acid ◽

Opposite Effect ◽

Solid Acid ◽

Solid Acid Catalyst ◽

Acid Catalyst ◽

Direct Conversion ◽

Rich Medium ◽

Water Addition ◽

Ethanol Medium ◽

Mixed Medium

Eethyl levulinate (EL) can be produced by direct conversion of glucose in ethanol medium. Both sulfuric acid and solid acid catalyst (USY) can be used as effective acid catalyst. The maximum EL yields were almost same. However, the usage of USY is helpful to limit the diethyl ether (DEE) production efficiently for recycling of ethanol. In ethanol/water mixed medium, water addition has significant effect on the products distribution. EL yield decreased obviously in water-rich medium. Meanwhile, the amount of DEE decreased with the increase of water addition. However, water addition has the opposite effect on the humic solid formation, and more humic solid can be formed in water-rich medium.

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Reaction Kinetics in Conversion Process of Pineapple Leaves into Glucose

REAKTOR ◽

10.14710/reaktor.18.03.155-159 ◽

2018 ◽

Vol 18 (03) ◽

pp. 155 ◽

Cited By ~ 1

Author(s):

Muhaimin Muhaimin ◽

Beta Wulan Febriana ◽

Septian Arfan

Keyword(s):

Sulfuric Acid ◽

Reaction Kinetics ◽

Reaction Rate ◽

Catalyst Concentration ◽

Acid Catalyst ◽

Reaction Rate Constant ◽

First Order ◽

Glucose Levels ◽

Hydrolysis Of ◽

Pineapple Leaves

Abstract This research aimed to determine the reaction kinetics in the process of hydrolysis of pineapple leaves. The experiment was carried out at the temperature (60, 90, and 120 oC) and variation of acid catalyst concentration (0.1; 0.5 and 1 M) by observation reaction time every 30 min. The kinetics model of hydrolysis reactions of pineapple leaves has shown first order reaction with activation energy value to find the concentration of sulfuric acid successively: 0.1 M; -15420 KJ/mol; 0,5 M; 3173.8 KJ/mol; 1 M; 100.53 KJ/mol. The reaction rate constant which produced the highest glucose level was on the use of sulfuric acid at a concentration of 0.1 M at a temperature of 120 oC with glucose levels produced between 26.366.039 ppm to 155.510.778 ppm with k = 0.0106/min. Keywords: glucose; hydrolysis; kinetic model; pineapple leaves

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The influence of iron compounds in the sulfuric acid catalyst on the SO2 oxidation process

Polish Journal of Chemical Technology ◽

10.2478/v10026-007-0002-2 ◽

2007 ◽

Vol 9 (1) ◽

pp. 2-6 ◽

Cited By ~ 2

Author(s):

Marcin Grobela ◽

Piotr Grzesiak

Keyword(s):

Sulfuric Acid ◽

Acid Production ◽

Reaction Rate ◽

Oxidation Process ◽

Acid Catalyst ◽

Active Phase ◽

Main Stage ◽

Iron Compounds ◽

So2 Oxidation ◽

Sulfuric Acid Catalyst

The influence of iron compounds in the sulfuric acid catalyst on the SO2 oxidation process The catalytic oxidation process of SO2 to SO3 is the main stage of sulfuric (VI) acid production. The process run could be disordered by reason of the increased inactivation of sulfuric acid catalyst during SO2 oxidation process. This paper includes the influence study of the iron quantity and forms, which is introduced into the catalyst active phase, on the reaction rate of the SO2 oxidation process.

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Kinetics of carbon monoxide methanation on a Ni/SiO2 catalyst

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19901678 ◽

1990 ◽

Vol 55 (7) ◽

pp. 1678-1685

Author(s):

Vladimír Stuchlý ◽

Karel Klusáček

Keyword(s):

Carbon Monoxide ◽

Reaction Rate ◽

Catalyst Activity ◽

Adsorbed Hydrogen ◽

Reaction Products ◽

Co Methanation ◽

Molar Ratios ◽

Rate Determining Step ◽

Higher Temperature ◽

Kinetics Of

Kinetics of CO methanation on a commercial Ni/SiO2 catalyst was evaluated at atmospheric pressure, between 528 and 550 K and for hydrogen to carbon monoxide molar ratios ranging from 3 : 1 to 200 : 1. The effect of reaction products on the reaction rate was also examined. Below 550 K, only methane was selectively formed. Above this temperature, the formation of carbon dioxide was also observed. The experimental data could be described by two modified Langmuir-Hinshelwood kinetic models, based on hydrogenation of surface CO by molecularly or by dissociatively adsorbed hydrogen in the rate-determining step. Water reversibly lowered catalyst activity and its effect was more pronounced at higher temperature.

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