acidity of alcohols and phenols oil

Acidity of biomass fast pyrolysis bio

The use of the TAN method for measuring the acidity of biomass fast pyrolysis bio-oil was evaluated Suggestions for carrying out the analysis have been made The TAN method by ASTM D664 or D3339 can be used for measuring the acidity of fast pyrolysis bio-oils and their hydrotreating products The

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Phenols : definition of Phenols and synonyms of Phenols

Although similar to alcohols phenols have unique properties and are not classified as alcohols (since the hydroxyl group is not bonded to a saturated carbon atom) They have higher acidities due to the aromatic ring's tight coupling with the oxygen and a relatively loose bond between the oxygen and hydrogen The acidity of the hydroxyl group in phenols is commonly intermediate

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Potentiometric titration of acidity in oils

Potentiometric Determination of Acidity in Highly Colored Materials Application to New and Used Petroleum Lubricants Containing Additives Industrial Engineering Chemistry Analytical Edition 1944 16 (4) 219-234 DOI: 10 1021/i560128a002 N Howell Furman Potentiometric Titrations

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Physical and Chemical Properties of Alcohols

Some prominent physical and chemical properties of alcohols are given below Physical Properties of Alcohol 1 The Boiling Point of Alcohols Alcohols generally have higher boiling points in comparison to other hydrocarbons having equal molecular masses This is due to the presence of intermolecular hydrogen bonding between hydroxyl groups of alcohol molecules

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Polyphenols in olive oil: variability and composition

Jan 08 2015Polyphenols in olive oil: variability and chemical composition 8 January 2015 Dr Nicola Tazzini 1 Comment Olive oil which is obtained from the pressing of the olives the fruits of olive tree ( Olea europaea ) is the main source of fat in the Mediterranean diet and a good source of polyphenols

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Phenols production from online catalytic conversion of

Phenols Production from Online Catalytic Conversion of Corn Stalk Pyrolysis Vapors using Char in-situ Yunchao Li a Xianhua Wang b * Huawei Song a Jingai Shao b Hongtao Ma a and Hanping Chen b Char in-situ (char is) obtained from corn stalk pyrolysis was evaluated as a catalyst to upgrade corn stalk pyrolysis vapors A catalyst

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Catalytic Upgrading of Bio

compounds alcohols and water into esters alkylated phenols ethers and alcohols respectively These products are less hydrophilic and have a higher fuel value Water is removed instead of being generated The hydroxyl groups present in bio-oil were removed and the fuel value of the product was enhanced

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2 Properties of alcohols

Alcohols are soluble in water This is due to the hydroxyl group in the alcohol which is able to form hydrogen bons with water molecules Alcohols with a smaller hydrocarbon chain are very soluble As the length of the hydrocarbon chain increases the solubility in water decreases With four carbon in the hydrocarbon chain and higher the

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Olive oils from Algeria: Phenolic compounds antioxidant

Olive oils from Algeria: Phenolic compounds antioxidant and antibacterial activities F Laincer a R Laribi a A Tamendjari a * L Arrar b P Rovellini c and S Venturini c a Laboratory of Applied Biochemistry Faculty of Natural and Life Sciences University of Bejaia Algeria

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CHAPTER 17 ALCOHOLS THIOLS

Alcohols and phenols have similar geometry to HOH The R-O-H bond angle is approximately tetrahedral (109() and the 'O' atom is sp3 hybridized Because of the presence of the hydroxyl group alcohols (and phenols) have significantly higher boiling points than their constitutional (structural) isomers the ethers

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How does the acidity of phenols compare with that of

Phenols are compounds that have a hydroxyl group attached to an aryl group They are weak acids In a water solution they dissociate partially to form hydronium ion and a phenoxide ion This can be shown as given below What are the differences between individual and external or environmental

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Alcohol

The term alcohol originally referred to the primary alcohol ethanol (ethyl alcohol) which is used as a drug and is the main alcohol present in alcoholic beverages An important class of alcohols of which methanol and ethanol are the simplest members includes all compounds for which the general formula is C n H 2n+1 OH

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How higher alcohols and volatile phenols impact on key

Apr 01 2015Introduction This article is one of a series which covers the fungal and bacterial origins of wine aromas These articles detail esters aldehydes volatile fatty acids volatile phenols sulphurous compounds and higher alcohols The old adage "one man's trash is another man's treasure" holds true with these compounds When the winemaker typically thinks of

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Other Reactions of Phenol

You will probably remember that you can make esters from alcohols by reacting them with carboxylic acids You might expect phenol to be similar However unlike alcohols phenol reacts so slowly with carboxylic acids that you normally react it with acyl chlorides (acid chlorides) or acid anhydrides instead

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What is a Phenol? (with pictures)

Apr 25 2020The word phenol may also refer to carbolic acid (C 6 H 5 OH) the simplest of this group of chemicals The phenol category is chemically similar to the alcohols but phenols form tighter hydrogen bonds with other chemical compounds They are also set apart from alcohols by their higher acidity solubility and boiling points

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Antioxidants in Greek Olive Oils

May 13 2014Greece is ranked third after Spain and Italy in olive oil production The number of Greek olive cultivars—excluding clonal selections—is greater than 40 however more than 90% of the acreage is cultivated with 20 cultivars adapted to a

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Alcohols Phenols and Ethers

Apr 29 2019ALCOHOLS PHENOLS AND ETHERS ALCOHOLS Alcohols are organic compounds containing hydroxyl (OH) group and can be considered analogues of water Electrons withdrawing groups on an alcohol increase the acidity by stabilising the alkoxide formed The middle oil and heavy oil fraction contain phenols and naphthalene On cooling

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Influence of storage temperature on quality parameters

Influence of storage temperature on quality parameters phenols and volatile compounds of Croatian olive oils K Brkić Bubola a * O Koprivnjak b B Sladonja a and I Belobrajić a a Institute of Agriculture and Tourism K Huguesa 8 HR-52440 Poreč Croatia b Department of Food Technology and Control School of Medicine University of Rijeka Brace Branchetta 20

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PowerPoint Presentation

Phenols however can be converted to phenoxides ions in this way The Basicity of Alcohols and Phenols Dehydration of Alcohols to Alkenes Sometimes a single alcohol gives two or more alkenes The Reaction of Alcohols with Hydrogen Halides Reaction occurs by an SN2 mechanism when the alcohol is protonated by an acid

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Phenols

The acidity of the hydroxyl group in phenols is commonly intermediate between that of aliphatic alcohols and carboxylic acids (their pK a is usually comprised between 10 and 12) Loss of a positive hydrogen ion (H +) from the hydroxyl group of a phenol forms a negative phenolate ion Some phenols are germicidal and are used in formulating

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PHENOLS

Phenols are poisonous in nature but act as disinfectant and antiseptic 2 Solubility Phenols form H-Bonds with water molecule and hence soluble in water but their solubility is lower than that of alcohols because of large hydrocarbon part Intermolecular H-bonding among water and phenol molecules 3 Boiling point

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Alcohol and Phenols Rxn

Alcohols and Phenols Alcohols and Phenols Alcohols contain an OH group connected to a a saturated C (sp 3) They are important solvents and synthesis intermediates Phenols contain an OH group connected to a carbon in a benzene ring Methanol CH3OH called methyl alcohol is a common solvent a fuel additive produced in large quantities

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