Title: Some physico‐chemical properties of ellagic acid
Abstract:Abstract Examples of formation of troublesome deposits containing ellagic acid in the wood pulping process are mentioned. The deposit from one such process in the U.K. has been examined in detail. Thi...Abstract Examples of formation of troublesome deposits containing ellagic acid in the wood pulping process are mentioned. The deposit from one such process in the U.K. has been examined in detail. This paper is mainly devoted to the determination of some physico‐chemical properties of ellagic acid, which are relevant to the study of minimising the formation of the deposit in the wood digester. A specially built apparatus was used for the determination of these properties at 170° (the normal digestion temperature). The ultra‐violet and visible absorption spectra measured at different pH values and temperatures were used to determine a dissociation constant of the acid at 20° which was found to be 11·0. The solubility of the acid was determined at 20°, 90° and 170°. From the changes in absorbance at 250 nm the decomposition was found to consist of two consecutive firstorder reactions, the rate constant of the first reaction being inversely proportional to a fractional power of hydrogen ion concentration. The activation energy was estimated to be 5·5 kcal and was independent of pH value.Read More
Publication Year: 1969
Publication Date: 1969-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 35
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