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4-Hydroxybenzoic acid

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4-Hydroxybenzoic acid Basic information
4-Hydroxybenzoic acid Chemical Properties
  • Melting point:213-217 °C (lit.)
  • Boiling point:213.5°C (rough estimate)
  • Density 1,46 g/cm3
  • refractive index 1.4600 (estimate)
  • Flash point:199 °C
  • storage temp. Refrigerator
  • solubility methanol: soluble5%, clear to slightly hazy, colorless to faintly yellow
  • pka4.48(at 19℃)
  • form Crystalline Powder
  • color White to ivory
  • PH3.3 (1g/l, H2O, 20℃)
  • Water Solubility 5 g/L (20 ºC)
  • Merck 14,4812
  • JECFA Number957
  • BRN 970950
  • CAS DataBase Reference99-96-7(CAS DataBase Reference)
  • NIST Chemistry ReferenceBenzoic acid, 4-hydroxy-(99-96-7)
  • EPA Substance Registry Systemp-Hydroxybenzoic acid (99-96-7)
Safety Information
4-Hydroxybenzoic acid Usage And Synthesis
  • Chemical Properties4-Hydroxybenzoic acid is an odorless white crystalline astringent powder. In pure form, it imparts a sweetish taste at first, which quickly becomes acrid and disagreeable
  • OccurrenceReportedly present in apple juice, black currant, cheese, beer, grape brandy, rum, sherry, wines, cocoa, peanut, soybean and wort.
  • Usesp-Hydroxybenzoic acid is of significant commercial importance. The most familiar application is the use of several of its esters as preservatives, known as parabens. Also of interest is the use in liquid crystal polymer applications.
  • UsesAcetylsalicylic Acid Impurity A
  • UsesIn organic. syntheses; intermediate for dyes, fungicides.
  • DefinitionChEBI: A monohydroxybenzoic acid that is benzoic acid carrying a hydroxy substituent at C-4 of the benzene ring.
  • PreparationPrepared from p-bromophenol or p-hydroxybenzaldehyde, or from saponification of methyl salicylate, a major component of oil of wintergreen.
  • Aroma threshold valuesDetection at 5 ppm (water)
  • Synthesis Reference(s)Journal of the American Chemical Society, 106, p. 174, 1984 DOI: 10.1021/ja00313a035
    The Journal of Organic Chemistry, 29, p. 3459, 1964 DOI: 10.1021/jo01035a003
  • Purification MethodsCrystallise the hydroxyacid from water. [Beilstein 10 IV 345.]
4-Hydroxybenzoic acid Preparation Products And Raw materials
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