Analysis of mixtures of glycerol, propylene glycol, and trimethylene glycol

Pohle, W. D.; Mehlenbacher, V. C.

doi:10.1007/bf02643300

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The alcoholysis reaction is completed when the alcoholysis mixture becomes soluble in the methanol. Each sample withdrawn is analyzed for α‐monoglyceride, and free glycerol contents by the method of Pohle and Mehlenbacher 14. Polyglycerol analysis was done as reported by Tawn 15…”

Section: Methodsmentioning

confidence: 99%

Studies on the alcoholysis of some seed oils

Igwe

Ogbobe

2000

J. Appl. Polym. Sci.

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The effects of time and temperature on the alcoholysis of rubber seed, melon seed, linseed, and soyabean oils have been studied. The following temperatures were investigated: 200, 220, 245, and 260°C. Litharge (PbO) was used as the alcoholysis catalyst. The optimum alcoholysis temperature was found to be 245 ± 2 °C for each of the oils. At lower alcoholysis temperatures (<245°C), there is the preferential alcoholysis of seed oils derived from unsaturated acid; and the general alcoholysis rates were found to be in the following order: linseed oil ≈ rubber seed oil ≥ soyabean oil ≈ melon seed oil. The alcohol‐solubility of the oils is generally observed to begin at 42–45% conversion of oils to monoglycerides. The α‐monoglyceride contents of the alcoholysis mixtures of rubber seed and linseed oils were generally similar at methanol tolerance, and higher than those of melon seed and soyabean oils. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1826–1832, 2000

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Section: Methodsmentioning

confidence: 99%

Studies on the alcoholysis of some seed oils

Igwe

Ogbobe

2000

J. Appl. Polym. Sci.

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“…Pohle and Mehlenbacher (9) were the first to take advantage of this unique oxidation behavior of glycerine when analyzing mixtures containing glycerine, propylene glycol, and trimethylene glycol. The propylene glycol responds to the periodic acid reagent like monoglycerides, and the trimethylene glycol is unaffected.…”

Section: Acidmentioning

confidence: 99%

The determination of free hydroxyl groups in fatty materials

Handschumaker¹

1955

J Americ Oil Chem Soc

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“…Newburger and Bruening (7) determined glycerol in the presence of ethylene and propylene glycols by titration of the formic acid liberated upon oxidation with potassium periodate. Pohle and Mehlenbacher (10) tures of glycerol, propylene glycol, and trimethylene glycol by first determining glycerol as formic acid. Propylene glycol was then measured by titration of the iodine which is liberated when potassium iodide is added to the oxidized solution; trimethylene glycol is determined by acetyl value.…”

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confidence: 99%

“…Originating in 1935, the first reported methods (3, -5, S, 9, 11) for the analysis of alkvd resins were naturally aimed at the determination of phthalic acid. Perhaps the simplest and most reliable of these earlier procedures is that devised by Kappelmeier who subsequently discussed his technique, perfected for the resins commercially available at the time, in some detail (10). The method is based on the quantitative precipitation, under controlled conditions, of dipotassium phthalate monoalcoholate during saponification of the polyester with potassium hydroxide dissolved in absolute alcohol.…”

mentioning

confidence: 99%