Efficient Methyl Esterification Using Methoxyl Silica Gel as a Novel Dehydrating Reagent

Li, Jianguo; Peng, Yanqing

doi:10.1002/jccs.201000045

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…While not within direct biodegradation pathways, an ester (RCO 2 R′) is reversibly created from an organic acid (RCO 2 H) and an alcohol (R′OH). While the R′ in more complex esters, such as in cyclopropanecarboxylic acid and cyclohexylmethyl esters, likely comes from the microbial transformation of petroleum, some methylesters identified in this study may be due to esterification of organic acids in the methanol eluate …”

Section: Resultsmentioning

confidence: 88%

“…While the R′ in more complex esters, such as in cyclopropanecarboxylic acid and cyclohexylmethyl esters, likely comes from the microbial transformation of petroleum, some methylesters identified in this study may be due to esterification of organic acids in the methanol eluate. 24 The vast majority of the polar compounds identified were polar metabolites arising from the biodegradation of petroleum hydrocarbons, but they were not the only polar compounds present in the groundwater extracts/eluates. Observed polar compounds from nonpetroleum sources identified in the mass spectral library search include phthalates (e.g., n-octyl phthalate), which are known plasticizers, and pesticides (e.g., tebuthiuron).…”

Section: ■ Results and Discussionmentioning

confidence: 96%

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Non-Targeted Analysis of Petroleum Metabolites in Groundwater Using GC×GC–TOFMS

Mohler

O’Reilly

Zemo³

et al. 2013

Environ. Sci. Technol.

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Groundwater at fuel release sites often contains nonpolar hydrocarbons that originate from both the fuel release and other environmental sources, as well as polar metabolites of petroleum biodegradation. These compounds, along with other polar artifacts, can be quantified as "total petroleum hydrocarbons" using USEPA Methods 3510/8015B, unless a silica gel cleanup step is used to separate nonpolar hydrocarbons from polar compounds prior to analysis. Only a limited number of these metabolites have been identified by traditional GC-MS methods, because they are difficult to resolve using single-column configurations. Additionally, the targeted use of derivatization limits the detection of many potential metabolites of interest. The objective of this research was to develop a nontargeted GC×GC-TOFMS approach to characterize petroleum metabolites in environmental samples gathered from fuel release sites. The method tentatively identified more than 760 unique polar compounds, including acids/esters, alcohols, phenols, ketones, and aldehydes, from 22 groundwater samples collected at five sites. Standards for 28 polar compounds indicate that effective limits of quantitation for most of these compounds in the groundwater samples range from 1 to 11 μg/L.

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Section: Resultsmentioning

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 96%

Non-Targeted Analysis of Petroleum Metabolites in Groundwater Using GC×GC–TOFMS

Mohler

O’Reilly

Zemo³

et al. 2013

Environ. Sci. Technol.

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“…Methyl benzoate (MB) compounds are an important class of chemical products. Most of these compounds have low toxicity and are mainly used in scents and as solvents [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For example, MB has a fruity flavor that can be used in pineapple, strawberry, and cherry syrups, and it as acts as a solvent in resin rubber.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Series of Methyl Benzoates through Esterification with a Zr/Ti Solid Acid Catalyst

Shi

Cheng

et al. 2023

Catalysts

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Methyl benzoate (MB) compounds are prepared by reacting various benzoic acids with methanol using an acidic catalyst. In this study, the solid acids of zirconium metal solids fixed with various substances were studied. We determined that zirconium metal catalysts with fixed Ti had the best activity. The catalytic synthesis of a series of MB compounds using titanium zirconium solid acids was studied. The direct condensation of benzoic acid and methanol using a metallic Lewis acid without other auxiliary Bronsted acids is reported for the first time.

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“…Firstly, by the physical removal of water using molecular sieves, however the dehydration efficiency of molecular sieves is relatively low. Alternatively, chemical removal using homogeneous dehydrating agents (coupling reagents) such as 1, 3-dicyclohexylcarbodiimide (DCC) have been employed from many years ago [16]. Silica gel's high surface area (around 800 m²/g) allows it to absorb water readily, making it useful as a desiccant (drying agent).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Biodiesel from Karanja Oil by Using Silica Gel Reactor

Mondal

Ferdous

Uddin

et al. 2014

Proceedings of 1st International E-Conference on Energies

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The oil extraction and biodiesel preparation from Karanja oil have different available methods namely acid catalyzed trans-esterification, acid catalyzed two-step and three-step method etc. The available methods are studied for biodiesel preparation from Karanja oil. The biodiesel conversion by esterification reaction may contain some moisture which may causes to slowdown the reaction rate and affects on the quality of biodiesel by making emulsion. The adsorption technique by using powder form of silica gal has been used in the reactor to improve the reaction rate. The data has been collected at the time of silica gel dosing and the amount of silica gel dosed for every reaction to optimize it. The optimum dosing condition were recorded by selecting the best dosing properties of biodiesel like specific gravity, free fatty acid (FFA) and viscosity etc. The properties of biodiesel namely specific gravity, viscosity, lower calorific value, cetane number, FFA, flash point, pour point, cloud point, iodine value and saponification value etc. have been carried out at optimum reaction condition. The fuel properties has been tested to meet the ASTM standards and compared with the conventional diesel fuel and standard biodiesel.

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Efficient Methyl Esterification Using Methoxyl Silica Gel as a Novel Dehydrating Reagent

Cited by 8 publications

References 19 publications

Non-Targeted Analysis of Petroleum Metabolites in Groundwater Using GC×GC–TOFMS

Non-Targeted Analysis of Petroleum Metabolites in Groundwater Using GC×GC–TOFMS

Synthesis of a Series of Methyl Benzoates through Esterification with a Zr/Ti Solid Acid Catalyst

Preparation and Characterization of Biodiesel from Karanja Oil by Using Silica Gel Reactor

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