Determination of total ash value. FT-NIR Spectroscopy, Hydroxyl Value, Polyol, Polyurethane hydroxide (KOH). in grams of substance. It is usually expressed as the KOH mass in mg equivalent to the amount of acetic acid reacting during the acetylation of 1g of resin. hydroxyl value number of milligrams of potassium hydroxide (KOH) corresponding to hydroxyl groups that have been acetylated under specified test conditions in 1 g of the product tested The hydroxyl value is a reference number used to characterize polyoles. a). The hydroxyl value can be calculated using the following equation. Additionally, sodium hydroxide may be Determination of acid value. Note that a chemical substance may also have a measurable acid value affecting the measured end point of the titration. 3 DEFINITION hydroxyl value : The number of milligrams of potassium hydroxide necessary to neutralize the acetic acid which will combine by acetylation with 1 g of the unsaturated polyester resin. A titrimetric method for determining the free hydroxyl groups in binders and binder solutions for paints and varnishes. 3.2 The hydroxyl value (or hydroxyl number) method measures the number of -OH groups on a molecule. The hydroxyl value is a reference number used to characterize polyoles. It is expressed as the amount of KOH in mg to neutralize the consumed equivalent amount of acetic acid used for the acetylation of 1 g of sample. Two titration methods are used in this analysis: a blank and a sample titration. The hydroxyl number (OH#) is a measure of the concentration of the hydroxyl groups on the polyol. The hydroxyl value (OHV) is defined as the number of milligrams KOH equivalent to the hydroxyl groups found in one gram of the sample and is expressed in mg of KOH/g (Srk Pyridine suitable for hydroxyl value determination, 99.5%; CAS Number: 110-86-1; EC Number: 203-809-9; find Sigma-Aldrich-246535 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich The hydroxyl value of a fatty alcohol or ethoxylate is defined as the number of milligrams of potassium hydroxide required to neutralise the acid required to esterify the hydroxyl groups The acid value is based on the quantity of potassium hydroxide required to neutralize one gram of free acid in one gram of fats, oils, or similar substances. 05 v/w V = difference in ml during titration W = wt. 2 KOH in ethanol, 0.5 mol/L (Titration reagent hydroxyl value) 3 Toluene 4 Ethanol 5 Deionized water 6 N-Methyl-2-Pyrrolidon 7 Acetic anhydride 8 4-N-Dimethylaminopyridine 9 N-Methyl-2 The method is a modification The blank value is stored as auxiliary value Login . A hydroxyl group is a functional group that attaches to some molecules containing an oxygen and hydrogen atom, bonded together. Acetyl value refers to the number of mg of KOH required to neutralize the acetic acid liberated by the hydrolysis of 1 g of acetylated oil or fat. Hydroxyl Group Definition. 4 PRINCIPLE Acetylation of the hydroxyl groups by acetic anhydride is This test method is for the determination of primary and secondary hydroxyl groups and can be used for the assay of com CALCULATION: Hydroxyl value = acid value + 28. Two titration methods are used in this analysis: a blank and a sample titration. Continue reading here: Nonaqueous titration of weak bases A primary Fourier transform infrared (FTIR) method was developed to determine the hydroxyl value (OHV) of polyols produced from edible oils. The hydroxyl value is an indicator of the reactivity of the acrylic resins functionalized with hydroxyl functions (ie the number of OH group available). Weigh accurately about 5 gm of the powdered drug in a tarred silica crucible. So using Tetraethylenepentamine (TEPA) Information and translations of hydroxyl value in the most comprehensive dictionary definitions resource on the web. 1. hydroxyl value The number of milligrams of potassium hydroxide necessary to neutralize the acetic acid which will combine, by acetylation, with 1 g of an unsaturated polyester resin. Reaction with acetic anhydride is used in pharmacopoeial assays of: benzyl alcohol and dienestrol and determination of hydroxyl values of castor oil, cetosteryl alcohol and cetomacrogol. The hydroxyl value is a reference number used to characterize polyoles. 2. Incinerate the powdered drug by gradually What does hydroxyl value mean? A method for the rapid determination of the hydroxyl value of oils, fats and related products is described. The method uses toluene-p-sulphonic acid as a catalyst and this allows the sample, dissolved in toluene, to be acetylated in 10 min at room temperature. Hydroxyl value refers to the 3) As a result, acetic acid is formed which is then back-titrated with methanolic KOH solution. The hydroxyl value is a reference number used to characterize polyoles. It is expressed as the amount of KOH in mg to neutralize the consumed equivalent amount of acetic acid used for the acetylation of 1 g of sample. 5.1 Hydroxyl is an important functional group and knowledge of its content is required in many intermediate and end use applications. The number of reactive hydroxyl groups (OH) on the polyol directly impacts the quantity of urethane linkages, which greatly influences the physical properties of the final polyurethane product. This method is based on reacting the hydroxyl compound with hexamethyldisilazane (HMDS) and The equivalent conductances of hydrogen and hydroxyl ions at the very small concentrations existing in pure water may be taken as equal to the accepted values at infinite dilution these The hydroxyl value detection method includes the steps of: weighing sample in a container, and taking another empty container; pipetting an acetic anhydride-imidazole-pyridine solution into It is expressed as the amount of KOH in mg to neutralize the consumed equivalent amount of acetic acid used for the acetylation of 1 g of sample. In analytical chemistry, the hydroxyl value is defined as the number of milligrams of potassium hydroxide required to neutralize the acetic acid taken up on acetylation of one gram of a The determination described in this report is based on the standards DIN EN ISO 46292:2016 (Hydroxyl - value) and DIN EN ISO 2114:200206 (acid value). This part of ISO 4629 specifies a titrimetric method for determining the hydroxyl value of resins, binders for paints and varnishes, primary alcohols, glycols and fats. The indicator was a 1% phenolphthalein solution in pyridine. The hydroxyl number, defined as mg KOH/g of a sample can calculated as follows: OH= (B-A)*M*56.1/w +acid number. Also spelled hydroxy, this functional group provides important functions to both alcohols and carboxylic acids. The milligrams of potassium hydroxide required to neutralize one gram of the solution is called the hydroxyl It is expressed as the amount of KOH in mg to neutralize the consumed equivalent amount of acetic acid used for The presented titration system can be used for the fully automated determination of the hydroxyl number (HN) according to ASTM E1899 and EN ISO 4629-2. In analytical chemistry, the hydroxyl value is defined as the number of milligrams of potassium hydroxide required to neutralize the acetic acid taken up on acetylation of one gram of a chemical substance that contains free hydroxyl groups. The acid value for castor oil is about 2.0 giving a hydroxyl value for the above sample of 156. A relatively simple method is described for routine determination of hydroxyl values for a wide range of hydroxyl containing compounds including soybean oil polyols, polyols derived from soy meal, polyether polyols and ethylene glycol as well as their blends. Hydroxyl value refers to the number of mg of KOH required to neutralize the acetic acid capable of combining by acetylation with 1 g of fat. Acid number (2114)-Hydroxyl number(4629-2)_us.docx 1/8 SI Analytics-Application report Titration Determination of hydroxyl value (DIN EN ISO 4692-2) and acid value (DIN EN ISO 2114) Description . It is the number of Nitrogens x 56.1 (Mwt of KOH) x 1000 (convert to milligrams) divided by molecular mass of the amine functional compound. 25.2 PRINCIPLE The process consists of The result is reported in milligram of potassium hydroxide titrated by a sample of 1 g A primary Fourier transform infrared (FTIR) method was developed to determine the hydroxyl value (OHV) of polyols produced from edible oils. Iodine value and hydroxyl value of DCO, obtained at atmospheric and reduced pressure (500 mbar), were determined as 135.8 and 140, and 12.3 and 11.9, respectively, using ESTIMATION OF VOLATILE ACIDS PRINCIPLE: Steam distillation after acidifying the sample with 1+1 H 2 SO 4 results in the evaporation of volatile acids which on condensation yield liquefied volatile acids.

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