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Propylparaben (also spelled propyl paraben) is the n-propyl ester of p-hydroxybenzoic acid. It occurs as a natural substance found in many plants and some insects. Additionally, it can be manufactured synthetically for use in cosmetics, pharmaceuticals, and foods. [ 1 ]
4-Hydroxybenzoic acid, also known as p-hydroxybenzoic acid (PHBA), is a monohydroxybenzoic acid, a phenolic derivative of benzoic acid.It is a white crystalline solid that is slightly soluble in water and chloroform but more soluble in polar organic solvents such as alcohols and acetone. 4-Hydroxybenzoic acid is primarily known as the basis for the preparation of its esters, known as parabens ...
The Arrhenius equation was used in a study to calculate activation energies for the chlorination of four parent parabens (methyl-, ethyl-, propyl-, and butylparaben) and was found to range from 36–47 kJ/mol. [21] In another study, tap water at 20 °C (68 °F) containing 50–200 μM free chlorine was spiked with 0.5 μM propylparaben and the ...
Melting point: −51.6 °C (−60.9 °F; 221.6 K) Boiling point: 230 °C (446 °F; 503 K) [2] ... Propyl benzoate has a nutty odor and sweet fruity or nut-like taste ...
Methylparaben (methyl paraben) one of the parabens, is a preservative with the chemical formula CH 3 (C 6 H 4 (OH)COO). It is the methyl ester of p -hydroxybenzoic acid . Natural occurrences
Butylparaben, or butyl p-hydroxybenzoate, is an organic compound with the formula C 4 H 9 O 2 CC 6 H 4 OH. [1] It is a white solid that is soluble in organic solvents. It has proven to be a highly successful antimicrobial preservative in cosmetics. [2] It is also used in medication suspensions, and as a flavoring additive in food.
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This page contains tables of azeotrope data for various binary and ternary mixtures of solvents. The data include the composition of a mixture by weight (in binary azeotropes, when only one fraction is given, it is the fraction of the second component), the boiling point (b.p.) of a component, the boiling point of a mixture, and the specific gravity of the mixture.